What to do with coke oven gas after the methanol production stops?

It should be applied to city gas and connected to the city gas network.

It’s best to use it for city gas; if it’s not available, it can be used as fuel for boilers!

It can only be used as fuel gas; if there is still a surplus, it can only be vented.

City gas is the best, followed by boiler fuel!

It has many uses as fuel for urban users, as well as for boilers and power plants.

The optimal way of using coke oven gas should be determined by taking into full account the geographical location of your factory and its surrounding environment； Your description is too brief; it’s difficult to give you a reasonable opinion. The following options are provided for reference only: First, consider the excess amount of coke oven gas produced by your plant at present (the gas output per ton of coke is generally 450–500 Nm3/h). If this amount is sufficient to meet the gas demand of the minimum-sized cogeneration unit allowed, then power generation might be a better choice ； Its manufacturing process is also relatively mature, and the investment required is lower compared to other methods (such as city gas lamps); moreover, it meets energy-saving and environmental protection requirements, which makes it easier to get approval for such projects ； Secondly, when it is to be used as city gas, it is necessary to take into account the distance of surrounding users and their gas consumption levels. Market research should be conducted to thoroughly analyze whether the potential market can generate the expected investment returns ； III. The reason for shutting down the methanol plant is unknown; is it being considered to restart the plant once market conditions improve in the future? If the two systems can be integrated and complemented each other, it is recommended to opt for power generation (a smaller generator set can be used so that when both systems are activated together, they can generally meet the load requirements) ； IV. The methanol market is sluggish, and the coke market is not optimistic either. It is estimated that if your plant is not a integrated steel producer, its coke production may also be declining. If the gas production is very low, it might be advisable to vent the gas in the short term in order to reduce investments and get through this difficult period.

The components of coke oven gas are mainly CH4, CO2, and CO, whereas the components of liquefied gas include propane, butane, etc.; the composition of the two is very different.

After the methanol production at our plant was halted, coke oven gas was sent to power plants for use in boilers. However, the boilers cannot consume more than 26,000 units of this gas; the remaining amount is used by the carbon black factories in the vicinity, and the rest is vented.

Why was the methanol plant shut down?

Of course, it should be used for gas boilers or other purposes; releasing it is both a waste of resources and harmful to the environment.

Of course, it should be used for gas boilers or other purposes; releasing it is both a waste of resources and harmful to the environment.

It is best to send it to a power boiler, as this allows for the effective use of resources while reducing waste.

15# lijingyuan5010 How is liquefied gas produced from coke oven gas? Is such a technology available? If you know, please give a detailed introduction.

To be honest, it’s better to have the torch burning!

Try to avoid leaving it unused; coke oven gas is also a non-renewable energy source that should be utilized. If it is released into the environment, it will pollute it; be careful lest the environmental protection agency investigate you!

Coke oven gas can be used for power generation and the production of fertilizers; it can also serve as a gas fuel and industrial fuel, as well as for the production of methanol and hydrogen extraction. (1) Civil gas: Coke oven gas is the most suitable type of artificial gas for use as a civil fuel. It has a high calorific value of 4,000 kcal/m3, with a CO content of less than 10%, making it relatively safe. As a result, it has been used as the main civil fuel in large and medium-sized cities for a long time. However, with the emergence of natural gas – which has a higher calorific value, lower toxicity, and superior properties compared to coke oven gas – it has replaced most of the latter, leaving some of the coke oven gas produced for urban use without a proper destination. (II) Power generation: Coke oven gas can be used to replace coal in boilers for power generation; it can also be used directly in gas turbines to generate electricity. A mining authority in Hebei operates a coking plant with a capacity of 200,000 tons of coke, and it uses old airplane engines to generate 4,000 kW of electricity directly from coke oven gas, with good results. However, the cost of generating electricity using coke oven gas is high, the scale of such operations is limited, and it is difficult to connect to the power grid. (III) Production of fertilizers: Producing synthetic ammonia from coke oven gas is a mature process with 30 years of experience. There are many coking plants in China that have been producing fertilizers for years; the cost of synthetic ammonia in these plants is 1,400 yuan per ton, which is on par with market prices. It is best to use natural gas for production. (IV) Hydrogen extraction: Coke oven gas contains 58% hydrogen, and the Southwest Chemical Research Institute possesses mature technology for extracting hydrogen from coke oven gas using pressure swing adsorption. However, the comprehensive utilization of hydrogen is limited, and its scale is small. (5) Using coke oven gas as a reducing gas for iron production: Coke oven gas contains 58% hydrogen, making it an excellent reducing gas; its use in iron production has been industrialized abroad. In the future steel industry, coke will be used as a reducing agent in blast furnaces for iron production, while coke oven gas will be used as a reducing gas in shaft furnaces to produce sponge iron; however, these must be utilized in conjunction with steel plants. There are eight advantages to producing methanol from coke oven gas: 1. The methanol market is strong, with a wide range of downstream products. 2. Methanol is easy to transport and safe; in the event of a leak, it degrades rapidly. 3. The equipment investment is low; the cost to produce 1 ton of methanol is approximately 2,000 yuan. 4. The scale can be large or small, making it easy to arrange the facilities; annual production can range from tens of thousands of tons to several hundred thousand tons (a coking plant with a capacity of around 1 million tons can produce 100,000 tons of methanol). 5. It can be easily blended into gasoline as a substitute fuel. The investment for car fuel filling stations is low. 6. The manufacturing cost is low, at around 800 yuan per ton. 7. The coke oven gas from steel mills can be combined with converter gas and blast furnace gas to produce methanol, turning waste into a valuable resource. 8. The process technology is easy to master and widely applicable.

The \"Modern Coal Chemical Engineering Technology Manual\" also contains some information related to the utilization of coke oven gas. Coke oven gas has great value; why waste it by releasing it? Taking methanol production as an example, it may be possible to recoup the costs within 2–3 years.