Integration process of coke dry quenching co-production synthesis gas and downstream products thereof of methanol

A CDQ and synthesis gas technology, applied in the chemical industry, coke oven, organic chemistry, etc., can solve the problems of high hydrogen-to-carbon ratio, large investment in reformer, and complex process of producing synthesis gas from coke oven gas

Inactive Publication Date: 2008-10-22
YANTAI TONGYE CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing conversion processes of coke oven gas to synthesis gas include steam reforming, pure oxygen catalytic partial oxidation and non-catalytic partial oxidation. These processes have the disadvantages of large reformer investment, need to use reforming c

Method used

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  • Integration process of coke dry quenching co-production synthesis gas and downstream products thereof of methanol
  • Integration process of coke dry quenching co-production synthesis gas and downstream products thereof of methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] As shown in Figure 1. The volume of cooling section 1 of CDQ oven is 400m 3 , the volume of the pre-stored section is 300m 3 . Under the condition of an average coke yield of 150t / h, the red hot coke with an average temperature of 980°C was cooled. Low-pressure steam with a temperature of 120°C and a pressure of 0.2MPa is used as cooling gas, and is fed from the bottom of the cooling section of CDQ oven 1 at 15000Nm 3 / h (about 73t) is sprayed upwards, and the temperature rises after absorbing the sensible heat of the red coke during the rising process of the cooling section, and undergoes an endothermic chemical reaction with the red coke to form a temperature of 800°C and a pressure of 0.15MPa. The main components are CO and CO 2 、H 2 、H 2 O Syngas 16000Nm 3 / h.

[0059] The synthesis gas is removed from the water vapor sampling analysis results at room temperature as shown in the table below, and the converted synthesis gas volume is about 3000Nm 3 / h.

[00...

Embodiment 2

[0072] As shown in Figure 1. The same place as Embodiment 1 will not be repeated, the difference is that: the low-pressure steam produced by the low-pressure steam waste heat boiler 4 is introduced into the gas mixing tank 21, mixed with the coke oven gas from the coking process, and used as cooling gas from the cooling The steam nozzle at the bottom of the section blows into the mixed gas of low-pressure steam and coke oven gas 15000Nm 3 / h, the volume ratio of the low-pressure steam to coke oven gas is 5:1, the methane content is 20v%, the cooling gas temperature is 120°C, and the pressure is 0.2MPa. After the mixed gas of low-pressure steam and coke oven gas passes through the red coke layer, a crude synthesis gas of 18000Nm with a temperature of 800°C and a pressure of 0.15MPa is produced 3 / h. The results of water vapor sampling and analysis at room temperature are shown in the table below, and the converted synthesis gas volume is about 5000Nm 3 / h.

[0073] Composit...

Embodiment 3

[0082] The same place as in Embodiment 1 will not be described again, and the difference is that:

[0083] The temperature of the red coke entering the CDQ oven 1 is 900°C, and the temperature drops to 190°C after being CDQ by the cooling gas, and then it is discharged from the CDQ oven 1. Low-pressure steam with a temperature of 150°C and a pressure of 0.1 MPa is used as cooling gas, and is sprayed upward from the bottom of the cooling section of CDQ oven 1. During the rising process of the cooling section, the temperature rises after absorbing the sensible heat of red coke, and absorbs with red coke. The temperature of thermochemical reaction is 850℃, the pressure is 0.1MPa, and the main components are CO, CO 2 、H 2 of synthetic gas. The synthesis gas composition:

[0084] Composition (v%)

[0085] CO H 2 CH 4 N 2 CO 2 h 2 SO 2

[0086] 35 60 0.5 0.15 4 0.15 0.2

[0087] The synthesis gas is discharged from the upper part of the cooling section, a...

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Abstract

The invention discloses an integrated process of a dry quenching coke coproduction synthesis gas and the downstream product, methanol of the synthesis gas. The integrated process adopts the following steps that: low-pressure steam or the mixed gas of low-pressure steam and coke oven gas is used as cooling gas to absorb red coke sensible heat and to carry out water-gas reaction with red coke, thereby generating a synthesis gas; after dust removal, the synthesis gas is fed to a steam gas waste heat boiler and a low-pressure steam waste heat boiler to carry out heat recovery, and then is output; the steam gas waste heat boiler generates steam gas, while the low-pressure steam waste heat boiler generates low-pressure steam which is fed in a dry quenching coke oven as cooling gas; or the steam gas is used in a back pressure steam turbine to generate electricity, and the low-pressure steam left over after back pressure electricity generation is used as the cooling gas of dry quenching coke, thereby omitting the low-pressure steam waste heat boiler. Compared with the prior art, the integrated process combines the production of dry quenching coke and synthesis gas, and ensures that the dry quenching coke oven integrates the functions of quenching coke, conversion, gas making and coke desulfurization; meanwhile, methanol is made through making use of the synthesis gas generated during dry quenching coke.

Description

technical field [0001] The invention relates to a coke dry quenching process, in particular to an integrated process for simultaneously preparing synthesis gas and co-producing methanol through dry coke quenching, and belongs to the technical fields of chemical and metallurgical production. Background technique [0002] Coke dry quenching technology (CDQ, Coke Dry Quinching) uses low-temperature inert gas (nitrogen or flue gas) to exchange heat with red hot red coke in a dry quenching furnace to cool the red coke. After absorbing the sensible heat of red coke, the high-temperature inert gas transfers heat to the CDQ boiler to generate steam. The inert gas is cooled and the temperature drops, and then the circulating fan is blown into the CDQ furnace to cool the red coke for recycling. The steam generated by the CDQ boiler can be combined into the steam pipe network or sent to generate electricity. CDQ has a series of advantages such as recovering heat, reducing pollution an...

Claims

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Application Information

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IPC IPC(8): C10B39/02C07C31/04F01K11/02
CPCY02P20/10Y02P20/129Y02P20/50
Inventor 请求不公开姓名
Owner YANTAI TONGYE CHEM TECH
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