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Method and device using coke stove gas to prepare LNG (liquefied natural gas) and jointly produce methyl alcohol

A technology for coke oven gas and methanol, which is applied in chemical instruments and methods, gas fuels, preparation of hydroxyl compounds, etc., can solve the problems of low utilization rate of coke oven gas and secondary pollution, and achieves good market adaptability and high feasibility , good economic effect

Pending Publication Date: 2017-05-31
上海汉兴化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process has a low utilization rate of coke oven gas, and there is secondary pollution in the production process

Method used

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  • Method and device using coke stove gas to prepare LNG (liquefied natural gas) and jointly produce methyl alcohol
  • Method and device using coke stove gas to prepare LNG (liquefied natural gas) and jointly produce methyl alcohol
  • Method and device using coke stove gas to prepare LNG (liquefied natural gas) and jointly produce methyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] see figure 2 , a method for the co-production of methanol from coke oven gas to LNG in the present invention is characterized in that the coke oven gas is first pressurized to 0.45-0.6Mpa by a compressor, and then undergoes TSA pretreatment and PSA debenzene removal to remove naphthalene, tar, NH 3 , benzene and other heavy hydrocarbon compounds, and then pressurized to 2.5Mpa by the coke oven gas compressor, then sent to the hydrodesulfurization unit for desulfurization, and then sent to the MDEA decarbonization unit for decarburization, and the coke oven gas obtained after decarburization The carbon gas is then subjected to LNG cryogenic separation to obtain the product LNG; the LNG cryogenic separation adopts pre-drying, drying, mercury removal, and cryogenic treatment in sequence; at the same time, the exhaust gas of the cold box and the CO-enriched gas produced during decarburization by the MDEA decarbonization device 2 Gas can also be used as one of the raw mate...

Embodiment 2

[0122] see Figure 4 and Figure 5 , the hydrodesulfurization unit and MDEA decarburization unit in this example are mature existing technologies, and the existing equipment and processes in the original coke oven gas to methanol unit can be used, so they are not shown in the figure. This example is The coke oven gas-to-LNG co-production methanol device matched with the technique in Example 1 is characterized in that,

[0123] Including compressor, hydrodesulfurization unit, MDEA decarbonization unit, methanol synthesis unit, feed gas liquid separation tank 1-6, TSA pretreatment tower 1, TSA heater 1-5, PSA pretreatment tower 2, predrying tower 3 , drying tower 4, regeneration gas heater 4-1, mercury removal reactor 5, LNG cryogenic separation system 6, LNG storage tank and loading system 7;

[0124] The primary inlet of the compressor is used to input the coke oven gas raw material, the secondary outlet of the compressor is connected to the raw material gas liquid separatio...

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Abstract

The invention relates to the technical field of comprehensive utilization of coke stove gas of coking / steel plant industry, in particular to a method and a device using coke stove gas to prepare LNG (liquefied natural gas) and jointly produce methyl alcohol. The method is characterized by sequentially comprising the following steps of pressurizing the coke stove gas by a compressor, removing naphthalene, tar, NH3 (ammonia), benzene and other heavy hydrocarbon compounds by TSA (temperature swing adsorption) pretreatment and PSA (pressure swing adsorption) debenzolization, pressurizing by a coke stove gas compressor, sending into a hydrogenation and desulfurizing device to desulfurize, sending into an MDEA (methyldiethanolamine) decarbonizing device to remove carbon, and performing LNG deep-cold separation, so as to obtain an LNG product. Compared with the prior art, the method has the advantages that the coke stove gas is outputted by a secondary outlet of the compressor, and then is sequentially subject to the TSA pretreatment and the PSA debenzolization, so that the coke stove gas does not contain the naphthalene, tar, benzene and other matters; after the coke stove gas returns back into a third inlet of the compressor, the sewage is not drained in the third stage and fourth stage of the compressor, so that the treatment burden of a sewage treatment plant is reduced.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of coke oven gas in the coking / steel mill industry, in particular to a method and device for producing LNG from coke oven gas and co-producing methanol. Background technique [0002] Coke oven gas is a by-product of coking, and its main component is H 2 、CH 4 , CO and CO 2 , is a good chemical raw material and high calorific value fuel. However, there are many kinds of impurities contained in it, such as various forms of sulfur, tar, benzene, naphthalene, ammonia and HCN, etc., and the composition is complex, which seriously affects its scope of use. The more mature and economical method used to produce methanol from coke oven gas, but due to the impact of the methanol product market and capital constraints, all companies planning to produce methanol have stopped making progress. Therefore, large-scale coke oven gas is facing the crisis of being directly discharged, which has...

Claims

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Application Information

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IPC IPC(8): C10L3/08C07C29/151
CPCC10L3/08C07C29/1518C10L2290/542C07C31/04Y02E50/30
Inventor 纪志愿程云飞徐占杰孙健余浩潘益峰
Owner 上海汉兴化工科技有限公司
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