Advantages of CO2 transporting dry coal powder
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I would like to ask which technology currently uses CO2 to transport dry coal powder, and what are the advantages of using CO2 to transport dry coal powder? I have just come into contact with Qihua, so the questions I asked may be simpler. Please give me more advice!
1. It is mainly determined by the requirements of the product composition. It can be replaced by nitrogen when it is not needed. 2. The unit cost of transportation is low, but the overall total cost is not low. It varies depending on the nitrogen balance of the factory. 3. Technical adjustments need to be made to avoid dry ice blockage.
In a synthetic methanol plant, when the CO2 produced by methanol washing is vented, can CO2 transportation be used to reduce costs? Is it possible to reduce the NH3 content in crude gas? In addition, is it possible to suppress the production of CO2 in the gasifier and increase CO production?
Generally, chemical plants that use coal to produce methanol usually use nitrogen produced by air separation to transport dry coal powder at the beginning, and then use it to replace carbon dioxide when the conversion unit produces carbon dioxide.
Nowadays, it seems that CO2 is used more frequently in Shell furnaces, mostly for methanol production. As far as I know, stoves like those in Guizhou Tianfu are prepared to use CO2.
What you said above makes sense. It mainly depends on what product is being produced. Using CO2 to transport dry pulverized coal is generally used to synthesize methanol, increasing production and saving costs.
CO2 is used to replace nitrogen as the carrier gas for pulverized coal transportation. It is often used in coal-to-methanol and coal-to-syngas (CO+H2). According to reports, similar experiments have been conducted by Henan Longyu and Zhongyuan Dahua in China. From a principle analysis, after CO2 replaces N2, the effective gas composition will increase, and the N2 content will obviously decrease. Before the device is started, the carrier gas should still be nitrogen. Wait until the system is stable before switching to CO2. Before that, the pipelines need to be analyzed and pipelines that are suitable for the system pressure and temperature and can adapt to CO2 are selected.
Using CO2 as a transport carrier for pulverized coal gasification can effectively reduce the N2 content in syngas and save costs. However, the following issues should be noted at the same time: 1.CO 2. The impact on the pulverized coal line during transportation. 2. Unified adjustment of gasifier control parameters, that is, gasifier control when the oxygen-to-coal ratio changes. 3. The impact of changes in syngas components on subsequent processes.
CO2 transportation of dry coal powder can replace nitrogen, thereby reducing the content of inert gases in the product gas. At the same time, part of the CO2 can be reduced to CO by returning to the furnace, increasing the content of effective gas components and reducing CO2 waste gas emissions.
CO2 transportation of pulverized coal is necessary in plants that produce methanol to reduce the inert gas content. The second half of the sentence may not be tenable, at least not when producing synthetic ammonia. The reason is simple. Even if part of the CO2 returned to the furnace can be reduced to CO, it still has to be converted into CO2 through a shift reaction, which makes no sense. Therefore, CO2+O2 gasification technology is currently only used by carbonylation synthesis manufacturers. Discuss with people upstairs
Discuss with someone upstairs: CO2+O2=CO, CO generates CO2 through conversion, but at the same time generates H2, which increases the content of effective gas, and CO can be regarded as an effective gas.
CO2+O2 gasification of coke to prepare high-purity CO technology is a relatively new gas production technology. It uses coke (anthracite, petroleum coke) as raw material, O2 and CO2 as gasification agents, and uses a fixed-bed continuous gasification method at normal pressure to prepare high-purity CO gas. This method is called the coke partial oxidation-reduction method. Its complete technology has passed the technical achievement appraisal of coal chemical technology experts across the country and was patented by the Intellectual Property Office of the People's Republic of China on May 24, 1999. CO2+O2 consumes fossil energy, and the generated CO must be converted into the same amount of CO2, so... This post was last edited by the lion dancer outside the door at 2009-2-10 11:05 ]
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