China's use of fixed-bed gasifier gasification in the fertilizer industry has been decades of history, especially in the application of nitrogen fertilizer in the most common. However, due to the high energy consumption, low gasification intensity, low coal utilization rate, large environmental pollution, low degree of automation, and high labor intensity of this coal gasifier, it is currently a target of elimination. At the 7th coal gasification technology exchange recently held in Wuyishan, Fujian, experts generally believed that energy conservation and environmental protection are key issues that the Chinese government should focus on in the future. The National Development and Reform Commission has requested to stop the approval of the new fixed-bed coal gasifier project. Therefore, it is imperative to upgrade and upgrade the existing fixed-bed coal gasifier.
ZWL 2800mm new type of conical coal gasifier patented product developed by Shandong Zibo Xinke Machinery Co., Ltd. has been used by nearly 60 domestic companies in a short period of two years after Qiluyihua first put into operation. Have achieved more satisfactory performance. Some of the nitrogen companies used the new type of coal gasifier to replace the original more than 3000 mm intermittent fixed bed coal gasifier, which produced significant economic benefits. It can be expected that as a new type of practical and innovative equipment, the ZWL conical coal gasifier will usher in a new round of peak demand in the coming years.
According to Zou Wenli, Chief Engineer of China's Silicon Valley Corporation, since the mid-late 1980s, the 2260mm straight-type coal gasifier used in the small nitrogenous fertilizer industry began to expand and transform, and a series of gasifiers of various diameters have been formed. The diameter of the furnace has been expanded to 2800 mm, and the expansion and transformation has reached its limit. What direction should next gasification technology develop? After analysis, the industry generally believes that to further improve the operating efficiency of intermittent coal gasifiers, it is necessary to start from the main structure of the coal gasifier and develop a new coal gasification furnace. The ZWL conical coal gasifier is a new type of equipment that has been developed in this way.
After several years of application, the conical coal gasifier has been gradually improving its energy-saving and environmental protection effects in the technical transformation of nitrogen-generating enterprise gas-generating devices. Mainly as follows: First, the province of investment, easy installation. New or rebuilt 2400mm/2600mm conical coal gasifier can still use the upper furnace of the 2400mm straight coal gasifier, while the 2600mm/2800mm coal gasifier can still use the upper furnace of the 2600 straight coal gasifier body. In addition, the square frame, the spacing between the columns, and the outer diameter of the water jacket can be constant, and the chassis portion can only be expanded by the diameter of the upper ash warehouse according to the requirements of the expansion. The transformation of a conical coal gasifier can be completed in about 10 days, and the entire furnace reform cost is only 80,000 to 90,000 yuan; the second is to facilitate ventilation, increase furnace temperature and increase gas production. The coal is squeezed in the water jacket of the straight coal gasifier, and the carbon and slag in the lower gasification layer become soft and sticky at high temperature, and are squeezed by the upper char layer to become very dense, resulting in no ventilation effect of the gasification layer. it is good. In the conical coal gasifier water jacket, the larger the area down, the void fraction of the carbon layer is improved, so the ventilation effect is good, the furnace temperature is high, and the steam decomposition rate is high. Under the same conditions, the temperature of the gasification layer can be increased. About 50 °C ~ 100 °C, gas production also increased substantially, the increase in gas volume is far greater than the reduced area of ​​the gasification layer to reduce the amount of gas; Third, the operating flexibility, suitable for digestion of poor coal. For example, if the poor quality coal is softened and becomes sticky in the gasification layer of the straight coal gasifier water jacket, it will be squeezed by the upper carbon layer, and if it is not handled properly, it will be easily crusted and cause blockage. The conical coal gasifier can increase the blowing time during operation, and it is not easy to produce knots, fires, and blowovers. The furnace condition is stable, and the operation flexibility is increased. When the lower ash is used, the size of the concrete block is moderate, and the residual carbon content of the ash residue is About 10%, much less than the straight-tube coal gasifier, which is beneficial to reduce the coal consumption of synthetic ammonia; Fourth, the gasification intensity, a single oven gas production. The design of the conical water jacket is scientific and reasonable, and the CO reduction conditions in the blow air are destroyed, so that the CO content in the blow gas is reduced and the latent heat loss is reduced, thus increasing the single furnace gas production.
The output of synthetic ammonia can be calculated as follows: Before the use of a 2800 mm conical water jacket, the gas output from a single furnace can reach 4900 to 5200 m3/h, and after use it can reach 6000 m3/h, preferably reaching 6500 m3. / Hour; a single 2800 mm conical coal gasifier produces more than 1300 cubic meters of gas per 2610 mm straight tubular coal gasifier. The benefits are considerable. The most important thing is that the gas quality of the conical coal gasifier is significantly improved, and the content of useful gases such as H2 and CO is increased by an average of 2% to 3% over that of the straight coal gasifier.
According to Zhang Yuqiang, general manager of Lambda, the China Nitrogen Fertilizer Industry Association launched 18 circular economy support technologies to the industry at the 13th National Small Nitrogen Fertilizer Technology Exchange Conference recently concluded, 15 of which have been recommended to the National Development and Reform Commission. This includes the ZWL conical coal gasifier.
Shandong Yankuang Group Suihua Company adopted conical furnace to carry out technological transformation of the original urea gasifier. As a result, the contents of H2 and CO increased by 2.6% and 6.9% respectively before the transformation, while the content of CO2 exhaust gas decreased by 5.9%. Anhui Linquan Chemical Co., Ltd. also adopted this furnace for technological transformation. After the production, the gas output from the single furnace increased by 10%. The control of the ash layer was relatively stable, which significantly improved the quality of the lower ash and ensured the operation of the gas in the furnace. After Changli Branch of Qinhuangdao Chemical Industry Group was upgraded with a conical furnace, the average single furnace gas production increased by nearly 30%, the residual carbon content decreased from 25% to 12%, and the consumption of raw coal in the furnace fell from 1.35 tons/ton of ammonia to 1.23 tons/year. Tons of ammonia, the company not only recouped the investment that year, but also added a net profit of 6.5 million yuan.
It is reported that the conical coal gasifier is not only suitable for the new construction of the gas system, but also suitable for the transformation of 2400 mm and 2600 mm straight tubular coal gasifiers. The most suitable solution is to purchase one set of replacement conical water jacket and one conical special 2800 mm furnace directly when the straight water jacket needs to be replaced beyond the life cycle. At the same time, the coal components and fans are used according to the fertilizer plant. , Furnace ventilation, operating procedures to design debris and flow control device can be. According to incomplete statistics, the small nitrogenous fertilizer industry currently has about 2,500 coal gasification furnaces of 2400 mm. This group of coal gasification furnaces is in urgent need of expansion and transformation. If it is directly converted into a 2610 mm straight-tube furnace, the upper part of the upper shell lining is covered. Must be replaced; and if converted into a 2400 mm/2600 mm conical furnace, the upper furnace can still be used, which can save a lot of money and shorten the duration. It is also known that this technology can be applied not only in nitrogen fertilizer companies, but also in metallurgy, building materials and other enterprises.
Experts believe that the advent of conical coal gasifiers conforms to the current general trend of miscellaneous raw materials and quality deterioration. At the same time, it coincides with another peak of domestic gasification technology reform, and will surely become a replacement product for traditional coal gasifiers. , is expected to enter the rapid promotion stage.
ZWL 2800mm new type of conical coal gasifier patented product developed by Shandong Zibo Xinke Machinery Co., Ltd. has been used by nearly 60 domestic companies in a short period of two years after Qiluyihua first put into operation. Have achieved more satisfactory performance. Some of the nitrogen companies used the new type of coal gasifier to replace the original more than 3000 mm intermittent fixed bed coal gasifier, which produced significant economic benefits. It can be expected that as a new type of practical and innovative equipment, the ZWL conical coal gasifier will usher in a new round of peak demand in the coming years.
According to Zou Wenli, Chief Engineer of China's Silicon Valley Corporation, since the mid-late 1980s, the 2260mm straight-type coal gasifier used in the small nitrogenous fertilizer industry began to expand and transform, and a series of gasifiers of various diameters have been formed. The diameter of the furnace has been expanded to 2800 mm, and the expansion and transformation has reached its limit. What direction should next gasification technology develop? After analysis, the industry generally believes that to further improve the operating efficiency of intermittent coal gasifiers, it is necessary to start from the main structure of the coal gasifier and develop a new coal gasification furnace. The ZWL conical coal gasifier is a new type of equipment that has been developed in this way.
After several years of application, the conical coal gasifier has been gradually improving its energy-saving and environmental protection effects in the technical transformation of nitrogen-generating enterprise gas-generating devices. Mainly as follows: First, the province of investment, easy installation. New or rebuilt 2400mm/2600mm conical coal gasifier can still use the upper furnace of the 2400mm straight coal gasifier, while the 2600mm/2800mm coal gasifier can still use the upper furnace of the 2600 straight coal gasifier body. In addition, the square frame, the spacing between the columns, and the outer diameter of the water jacket can be constant, and the chassis portion can only be expanded by the diameter of the upper ash warehouse according to the requirements of the expansion. The transformation of a conical coal gasifier can be completed in about 10 days, and the entire furnace reform cost is only 80,000 to 90,000 yuan; the second is to facilitate ventilation, increase furnace temperature and increase gas production. The coal is squeezed in the water jacket of the straight coal gasifier, and the carbon and slag in the lower gasification layer become soft and sticky at high temperature, and are squeezed by the upper char layer to become very dense, resulting in no ventilation effect of the gasification layer. it is good. In the conical coal gasifier water jacket, the larger the area down, the void fraction of the carbon layer is improved, so the ventilation effect is good, the furnace temperature is high, and the steam decomposition rate is high. Under the same conditions, the temperature of the gasification layer can be increased. About 50 °C ~ 100 °C, gas production also increased substantially, the increase in gas volume is far greater than the reduced area of ​​the gasification layer to reduce the amount of gas; Third, the operating flexibility, suitable for digestion of poor coal. For example, if the poor quality coal is softened and becomes sticky in the gasification layer of the straight coal gasifier water jacket, it will be squeezed by the upper carbon layer, and if it is not handled properly, it will be easily crusted and cause blockage. The conical coal gasifier can increase the blowing time during operation, and it is not easy to produce knots, fires, and blowovers. The furnace condition is stable, and the operation flexibility is increased. When the lower ash is used, the size of the concrete block is moderate, and the residual carbon content of the ash residue is About 10%, much less than the straight-tube coal gasifier, which is beneficial to reduce the coal consumption of synthetic ammonia; Fourth, the gasification intensity, a single oven gas production. The design of the conical water jacket is scientific and reasonable, and the CO reduction conditions in the blow air are destroyed, so that the CO content in the blow gas is reduced and the latent heat loss is reduced, thus increasing the single furnace gas production.
The output of synthetic ammonia can be calculated as follows: Before the use of a 2800 mm conical water jacket, the gas output from a single furnace can reach 4900 to 5200 m3/h, and after use it can reach 6000 m3/h, preferably reaching 6500 m3. / Hour; a single 2800 mm conical coal gasifier produces more than 1300 cubic meters of gas per 2610 mm straight tubular coal gasifier. The benefits are considerable. The most important thing is that the gas quality of the conical coal gasifier is significantly improved, and the content of useful gases such as H2 and CO is increased by an average of 2% to 3% over that of the straight coal gasifier.
According to Zhang Yuqiang, general manager of Lambda, the China Nitrogen Fertilizer Industry Association launched 18 circular economy support technologies to the industry at the 13th National Small Nitrogen Fertilizer Technology Exchange Conference recently concluded, 15 of which have been recommended to the National Development and Reform Commission. This includes the ZWL conical coal gasifier.
Shandong Yankuang Group Suihua Company adopted conical furnace to carry out technological transformation of the original urea gasifier. As a result, the contents of H2 and CO increased by 2.6% and 6.9% respectively before the transformation, while the content of CO2 exhaust gas decreased by 5.9%. Anhui Linquan Chemical Co., Ltd. also adopted this furnace for technological transformation. After the production, the gas output from the single furnace increased by 10%. The control of the ash layer was relatively stable, which significantly improved the quality of the lower ash and ensured the operation of the gas in the furnace. After Changli Branch of Qinhuangdao Chemical Industry Group was upgraded with a conical furnace, the average single furnace gas production increased by nearly 30%, the residual carbon content decreased from 25% to 12%, and the consumption of raw coal in the furnace fell from 1.35 tons/ton of ammonia to 1.23 tons/year. Tons of ammonia, the company not only recouped the investment that year, but also added a net profit of 6.5 million yuan.
It is reported that the conical coal gasifier is not only suitable for the new construction of the gas system, but also suitable for the transformation of 2400 mm and 2600 mm straight tubular coal gasifiers. The most suitable solution is to purchase one set of replacement conical water jacket and one conical special 2800 mm furnace directly when the straight water jacket needs to be replaced beyond the life cycle. At the same time, the coal components and fans are used according to the fertilizer plant. , Furnace ventilation, operating procedures to design debris and flow control device can be. According to incomplete statistics, the small nitrogenous fertilizer industry currently has about 2,500 coal gasification furnaces of 2400 mm. This group of coal gasification furnaces is in urgent need of expansion and transformation. If it is directly converted into a 2610 mm straight-tube furnace, the upper part of the upper shell lining is covered. Must be replaced; and if converted into a 2400 mm/2600 mm conical furnace, the upper furnace can still be used, which can save a lot of money and shorten the duration. It is also known that this technology can be applied not only in nitrogen fertilizer companies, but also in metallurgy, building materials and other enterprises.
Experts believe that the advent of conical coal gasifiers conforms to the current general trend of miscellaneous raw materials and quality deterioration. At the same time, it coincides with another peak of domestic gasification technology reform, and will surely become a replacement product for traditional coal gasifiers. , is expected to enter the rapid promotion stage.
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