The two-year China International Coal Chemical Industry Conference is about to be held. The conference has attracted much attention from the industry. Many multinational companies will bring advanced technologies to promote them, and a large number of domestic coal chemical companies will also take up their own housekeeping skills. . China is a big country in coal chemical industry. However, following the large-scale introduction of synthetic ammonia technology devices in more than 30 years, dozens of foreign coal chemical installations have been introduced in recent years, and several million tons of methanol production capacity have been formed in a few years. Some experts in the industry have called for this to reflect on the fact that the domestic introduction of huge amounts of technology is not worthwhile. The localization of China's large-scale coal chemical technology equipment can no longer take the old road of worshipping the ocean.
The recently published monograph on coal chemical industry, "New Technologies in Modern Coal Chemicals," presents a thought-provoking issue. The book pointed out that "in the current methanol heat, basically the complete introduction of natural gas methanol plant, or the introduction of synthetic circuits in coal to methanol, the large-scale methanol is taking the old road of synthetic ammonia in the past. We have provided for nearly 40 years. Ammonia synthesis and methanol synthesis market, but no exchange of technology, large-scale ammonia and methanol production technology devices have also failed to achieve localization."
Objectively speaking, the domestic production of methanol in China is better than ammonia synthesis. The state will also include a single set of methanol production project with an annual output of 600,000 tons into the technical support plan. However, in some large-scale methanol projects with an annual output of 600,000 tons or even millions of tons, even if domestic technology developers have the opportunity to receive invitations to participate in bids, they often miss the final bid, and they have no chance to participate in competition, resulting in domestic The methanol synthesis project with an annual output of 600,000 tons or more that has been put into operation is almost entirely the introduction of foreign technology.
The introduction of foreign technology is not only expensive, but also controlled by Western technology and equipment suppliers. At present, domestic technology and equipment are really not enough for these projects? To solve this problem, it is necessary to use factual data to demonstrate whether or not domestic foreign technology equipment that is vigorously introduced is a state-of-the-art technology equipment that is worth spending heavily on.
For the advanced nature of large-scale methanol synthesis technology, according to the requirements of high efficiency, energy saving, low consumption, environmental protection, and economy, it can mainly be assessed from five aspects: First, it needs low cycle ratio, high net methanol value, and large equipment for large-scale equipment. The problem of high investment and energy consumption; the second is to effectively remove the heat of reaction, the catalyst bed temperature distribution is uniform and reasonable, give full play to the catalyst activity, increase the production of methanol, high by-product heat recovery steam; third is the high conversion rate of carbon monoxide, carbon dioxide , Low-emission gas, saving raw material consumption; Fourth, significantly reduce the pressure difference between the synthetic tower and methanol synthesis circuit, reduce energy consumption; Fifth, the single tower of the synthesis tower easy to large-scale, reduce the number of synthesis tower equipment and processing and transportation problems.
At present, the major methanol technologies introduced in China mainly include tube-shell water-cooled air-cooled tower combination schemes and water-cooled tube-shell tower-series air-cooled TCC schemes, while domestically produced technologies include horizontal water-cooled methanol towers. In the same situation where natural gas conversion gas is used as the raw material, the cycle ratio of domestic equipment is reduced to less than 2 and the net methanol value is as high as 12%. Moreover, the temperature difference between the domestically-made synthesizers is small, the temperature distribution is uniform, and domestic-made catalysts have good performance. In addition, the single-pass conversion of carbon monoxide in domestic methanol towers is higher than 88%, the total conversion rate is higher than 99%, and the amount of flue gas is greatly reduced. The domestic methanol tower catalyst has a high loading factor, and it has a zero-sizing, optimized design of the housing and internals, and can reach 5000 tons of methanol per day for a single unit, and 3 units for foreign water-cooled air-cooled processes.
Domestic authoritative institutions and experts believe that the domestic horizontal water-cooled methanol synthesis tower is a revolutionary breakthrough in methanol synthesis technology, reducing the recycle ratio to 1.9, the average methanol content of the tower gas reaching 11.85%, high alcohol net value, and low pressure drop. , The temperature difference is small, the structure is reasonable, the technical index exceeds the foreign advanced technology, the single station ability can not only reach 600,000 tons, but also can reach 1.8 million tons.
Inner Mongolia uses the first horizontal water-cooled methanol synthesis tower with a design pressure of up to 11.5 MPa. It is made of high-strength, heat-resistant, low-alloy steel. It has a plate thickness of 135 mm and a total weight of nearly 200 tons. It is based on material manufacturing, equipment design and processing. Completed by domestic companies, has created a number of records. In addition, domestic horizontal water-cooled methanol towers have reached design capacity in less than a few days after they were put into operation. Some synthetic vehicles imported from foreign countries have not reached the design capability even after several years of drive. Foreign technology companies do not have a warranty period of more than two years. Responsible for solving technical problems. This shows that domestic large-scale methanol technology equipment may not be inferior to foreign advanced technology equipment.
The above examples show that at present, China's methanol equipment hardware manufacturing capabilities and methanol synthesis software development has considerable ability and level, has independently developed and mastered the shell water cooling, sub-cooling, air-cooled heat exchange and water cooling tube - Mathematical model of air-cooled combined reactor, and successfully applied to the optimal design of the reactor. This indicates that China is currently fully capable of successfully completing the localization of large-scale coal chemical technology equipment.
The recently published monograph on coal chemical industry, "New Technologies in Modern Coal Chemicals," presents a thought-provoking issue. The book pointed out that "in the current methanol heat, basically the complete introduction of natural gas methanol plant, or the introduction of synthetic circuits in coal to methanol, the large-scale methanol is taking the old road of synthetic ammonia in the past. We have provided for nearly 40 years. Ammonia synthesis and methanol synthesis market, but no exchange of technology, large-scale ammonia and methanol production technology devices have also failed to achieve localization."
Objectively speaking, the domestic production of methanol in China is better than ammonia synthesis. The state will also include a single set of methanol production project with an annual output of 600,000 tons into the technical support plan. However, in some large-scale methanol projects with an annual output of 600,000 tons or even millions of tons, even if domestic technology developers have the opportunity to receive invitations to participate in bids, they often miss the final bid, and they have no chance to participate in competition, resulting in domestic The methanol synthesis project with an annual output of 600,000 tons or more that has been put into operation is almost entirely the introduction of foreign technology.
The introduction of foreign technology is not only expensive, but also controlled by Western technology and equipment suppliers. At present, domestic technology and equipment are really not enough for these projects? To solve this problem, it is necessary to use factual data to demonstrate whether or not domestic foreign technology equipment that is vigorously introduced is a state-of-the-art technology equipment that is worth spending heavily on.
For the advanced nature of large-scale methanol synthesis technology, according to the requirements of high efficiency, energy saving, low consumption, environmental protection, and economy, it can mainly be assessed from five aspects: First, it needs low cycle ratio, high net methanol value, and large equipment for large-scale equipment. The problem of high investment and energy consumption; the second is to effectively remove the heat of reaction, the catalyst bed temperature distribution is uniform and reasonable, give full play to the catalyst activity, increase the production of methanol, high by-product heat recovery steam; third is the high conversion rate of carbon monoxide, carbon dioxide , Low-emission gas, saving raw material consumption; Fourth, significantly reduce the pressure difference between the synthetic tower and methanol synthesis circuit, reduce energy consumption; Fifth, the single tower of the synthesis tower easy to large-scale, reduce the number of synthesis tower equipment and processing and transportation problems.
At present, the major methanol technologies introduced in China mainly include tube-shell water-cooled air-cooled tower combination schemes and water-cooled tube-shell tower-series air-cooled TCC schemes, while domestically produced technologies include horizontal water-cooled methanol towers. In the same situation where natural gas conversion gas is used as the raw material, the cycle ratio of domestic equipment is reduced to less than 2 and the net methanol value is as high as 12%. Moreover, the temperature difference between the domestically-made synthesizers is small, the temperature distribution is uniform, and domestic-made catalysts have good performance. In addition, the single-pass conversion of carbon monoxide in domestic methanol towers is higher than 88%, the total conversion rate is higher than 99%, and the amount of flue gas is greatly reduced. The domestic methanol tower catalyst has a high loading factor, and it has a zero-sizing, optimized design of the housing and internals, and can reach 5000 tons of methanol per day for a single unit, and 3 units for foreign water-cooled air-cooled processes.
Domestic authoritative institutions and experts believe that the domestic horizontal water-cooled methanol synthesis tower is a revolutionary breakthrough in methanol synthesis technology, reducing the recycle ratio to 1.9, the average methanol content of the tower gas reaching 11.85%, high alcohol net value, and low pressure drop. , The temperature difference is small, the structure is reasonable, the technical index exceeds the foreign advanced technology, the single station ability can not only reach 600,000 tons, but also can reach 1.8 million tons.
Inner Mongolia uses the first horizontal water-cooled methanol synthesis tower with a design pressure of up to 11.5 MPa. It is made of high-strength, heat-resistant, low-alloy steel. It has a plate thickness of 135 mm and a total weight of nearly 200 tons. It is based on material manufacturing, equipment design and processing. Completed by domestic companies, has created a number of records. In addition, domestic horizontal water-cooled methanol towers have reached design capacity in less than a few days after they were put into operation. Some synthetic vehicles imported from foreign countries have not reached the design capability even after several years of drive. Foreign technology companies do not have a warranty period of more than two years. Responsible for solving technical problems. This shows that domestic large-scale methanol technology equipment may not be inferior to foreign advanced technology equipment.
The above examples show that at present, China's methanol equipment hardware manufacturing capabilities and methanol synthesis software development has considerable ability and level, has independently developed and mastered the shell water cooling, sub-cooling, air-cooled heat exchange and water cooling tube - Mathematical model of air-cooled combined reactor, and successfully applied to the optimal design of the reactor. This indicates that China is currently fully capable of successfully completing the localization of large-scale coal chemical technology equipment.
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