Method for utilizing cracking gas waste heat and gas-gas exchanger used therefor
A technology for heat exchangers and pyrolysis gas, which is applied in the direction of heat exchanger types, direct contact heat exchangers, lighting and heating equipment, etc., and can solve the heat waste of high-temperature pyrolysis gas, low heat exchange efficiency, and high-temperature energy consumption of pyrolysis gas Dispersion and other issues, to achieve the effect of energy consumption reduction
Inactive Publication Date: 2011-10-05
SHANGHAI WUJING CHEM
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Problems solved by technology
The temperature of the cracked gas coming out of the cracking furnace is relatively high. When measures such as air cooling and water cooling are adopted, not only the heat transfer efficiency is low, but also the heat of this part of the high-temperature cracking gas is wasted.
The relatively large manufacturers in the world have adopted a high-efficiency chiller to improve the heat exchange efficiency of water-cooled high-temperature cracked gas, but there is still the problem of removing the high-temperature energy of the cracked gas with circulating water, and then circulating water Cooled by air, thus dissipating the high temperature energy of the cracked gas
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[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0021] see figure 1 , using the method of pyrolysis gas waste heat, first the raw material liquid enters the raw material vaporizer 1 and after being vaporized by the raw material vaporizer 1, the raw material steam enters from the raw material steam inlet 61 of the lower part of the outer jacketed pipe 6 of the gas-gas self-heat exchanger 2, and from the upper part The raw material superheated gas outlet 62 leaves and enters the cracking furnace 8. The high-temperature pyrolysis gas coming out of the cracking furnace 8 has a temperature of 500°C to 800°C, enters from the inner pipe 5 of the heat exchanger 2 from the gas-gas, and enters the subsequent process after countercurrent heat exchange with the raw material steam gas.
[0022] see figure 2 , a structural form of the gas-gas self-heat exchanger 2 is that the gas-gas self-heat exchange...
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The invention discloses a method for utilizing pyrolysis gas afterheat in the product field where acetic acid or acetone is adopted as materials to prepare ketene and ramification of the ketene after schizolysis. The high temperature pyrolysis gas out of a cracking furnace performs countercurrent flow through gas-gas self heat exchanger; the pyrolysis material liquid is evaporated to material steam through the vapourization of a carburetor and is, after becoming material overheating gas, preheated by the high temperature pyrolysis gas, enters into the cracking furnace to generate high temperature pyrolysis gas to send to the gas-gas self heat exchanger to perform countercurrent flow. The invention also discloses the gas-gas self heat exchanger adopted by the method. By adopting the methodfor utilizing pyrolysis gas afterheat and the gas-gas self heat exchanger, the material steam is preheated by the high tempreture pyrolysis gas and comprehensive utilization of the pyrolysis gas afterheat is realized, thereby achieving obvious energy-saving effect.
Description
technical field [0001] The invention relates to a method for utilizing the waste heat of cracked gas, in particular to disclose a method for utilizing the waste heat of cracked gas in the field of production of vinyl ketone and its derivatives by cracking raw materials such as acetic acid or acetone and the gas-gas automatic Heat Exchanger. Background technique [0002] According to investigations, in the field of producing vinyl ketone and its derivatives through pyrolysis of raw materials such as acetic acid or acetone, the cracked gas coming out of the cracking furnace is generally cooled by air cooling, water cooling and other measures. The temperature of the cracked gas coming out of the cracking furnace is relatively high. When measures such as air cooling and water cooling are used, not only the heat transfer efficiency is low, but also the heat of this part of the high-temperature cracking gas is wasted in vain. The relatively large manufacturers in the world have a...
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IPC IPC(8): F28C3/02
Inventor 曾义红叶小鹤陈艳顾明兰
Owner SHANGHAI WUJING CHEM