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CN-116926320-B - Method for preparing calcium coal pellet by pyrolysis of sliding arc plasma system

CN116926320BCN 116926320 BCN116926320 BCN 116926320BCN-116926320-B

Abstract

The invention relates to the technical field of preparation of calcium-coal-formed pellets, in particular to a method for preparing the calcium-coal-formed pellets by utilizing pyrolysis of a sliding arc plasma system, which comprises the following steps of S1, conveying quicklime and raw coal to a calcium-coal-pellet preparation unit, conveying formed calcium-coal-pellets to a pyrolysis chamber, S2, pyrolyzing the calcium-coal-pellets in the pyrolysis chamber to obtain and output the calcium-coal-formed pellets, introducing raw gas generated by pyrolyzing the calcium-coal-pellets in the pyrolysis chamber into a plasma area of a sliding arc reforming oxidation system reactor, and simultaneously introducing a gas oxidant with a preset volume into the sliding arc reforming oxidation system reactor so as to mix the gas oxidant with the raw gas, S3, inducing the raw gas and carrying out reforming oxidation reaction to generate high-temperature raw synthetic gas, and conveying the high-temperature raw synthetic gas to a raw synthetic gas purification unit and the pyrolysis chamber respectively.

Inventors

  • GENG HAITAO
  • YING GUOHAI

Assignees

  • 北京道思克能源设备有限公司

Dates

Publication Date
20260508
Application Date
20230713

Claims (8)

  1. 1. A method for preparing calcium-coalification pellets by pyrolysis with a sliding arc plasma system, characterized in that the sliding arc plasma system comprises a calcium-coal-pellet preparation unit (1), a pyrolysis chamber (2), a sliding arc reforming oxidation system reactor (3) and a raw synthesis gas purification unit (4), the method comprising the steps of: s1, conveying quicklime and raw coal to the calcium coal briquette preparation unit (1), and conveying formed calcium coal briquettes to the pyrolysis chamber (2); Step S2, pyrolyzing the calcium coal pellets in a pyrolysis chamber (2) to obtain and output calcium coal-formed pellets, introducing raw gas generated by pyrolyzing the calcium coal pellets in the pyrolysis chamber (2) into a plasma region of the sliding arc reforming oxidation system reactor (3), and simultaneously introducing a gas oxidant with a preset volume into the sliding arc reforming oxidation system reactor (3) so as to mix the gas oxidant with the raw gas, wherein the sliding arc reforming oxidation system reactor (3) comprises a sliding arc plasma generator (3.1) and a reforming oxidation system reactor (3.2), and the step S2 comprises the following steps: s21, pyrolyzing the calcium coal pellets in a pyrolysis chamber (2) to obtain and output calcium coal pellets; step S22, applying high voltage to the electrode in the sliding arc plasma generator (3.1) to generate sliding non-thermal arc plasma, and conveying the sliding non-thermal arc plasma to the plasma zone; s23, introducing raw gas generated by pyrolyzing calcium coal briquettes in a pyrolysis chamber (2) into a plasma region of the reforming oxidation system reactor (3.2), and simultaneously introducing a gas oxidant into the reforming oxidation system reactor (3.2) so as to mix the gas oxidant with the raw gas; And S3, inducing the raw gas by plasma and generating reforming oxidation reaction to generate high-temperature raw synthesis gas, and respectively conveying the high-temperature raw synthesis gas to the raw synthesis gas purification unit (4) and the pyrolysis chamber (2), wherein the temperature of the high-temperature raw synthesis gas conveyed to the pyrolysis chamber (2) is 750-900 ℃.
  2. 2. The method for preparing calcaneous pellets by pyrolysis with a sliding arc plasma system according to claim 1, characterized in that in the step S23, the reforming oxidation system reactor (3.2) is preheated to an operating temperature before introducing the gaseous oxidizing agent into the sliding arc reforming oxidation system reactor (3.2).
  3. 3. The method of producing calcic coal pellets by pyrolysis with a sliding arc plasma system according to claim 2, characterized in that the operating temperature is 750 ℃ to 900 ℃.
  4. 4. The method according to claim 1, characterized in that in step S3 the high temperature raw synthesis gas is fed to the raw synthesis gas purification unit (4), purified to synthesis gas and fed to external equipment as chemical product raw material.
  5. 5. The method according to claim 4, wherein in step S3, the high-temperature raw synthesis gas is sent to the raw synthesis gas purification unit (4) and purified to synthesis gas, and after the synthesis gas is sent to an external device as a raw material of chemical products, the outlet temperature of the synthesis gas is 300 ℃ to 450 ℃ when the synthesis gas is sent to the external device.
  6. 6. The method for preparing calcic coal pellets by pyrolysis with a sliding arc plasma system according to claim 1, wherein the gaseous oxidant is air, oxygen, water vapor or carbon dioxide.
  7. 7. The method for preparing calcic coal pellets by pyrolysis with a sliding arc plasma system according to claim 1, characterized in that the oxygen content of the preset volume of gaseous oxidant is 5-100%.
  8. 8. The method for preparing calcic coalification pellets by pyrolysis with a sliding arc plasma system of claim 1 wherein the high temperature raw syngas is an oxide free of nitrogen oxides.

Description

Method for preparing calcium coal pellet by pyrolysis of sliding arc plasma system Technical Field The invention relates to the technical field of preparation of calcium-coal-formed pellets, in particular to a method for preparing calcium-coal-formed pellets by pyrolysis of a sliding arc plasma system. Background Acetylene can be used for producing various organic compounds due to the self structural characteristics, and at present, acetylene is still a chemical resource with huge productivity, so that deep exploration of acetylene chemical industry has important significance. Acetylene is replaced by ethylene in the production of some organic compounds from the technical development and cost point of view, but is not used any more in the production of other organic compounds, and is still unsubstituted as a raw material, and in modern acetylene chemical industry, large industrial products prepared by using acetylene are butadiene, vinyl chloride or vinyl acetate and the like. The calcium carbide (C aC2) is a main industrial raw material for producing acetylene, can be used as a reducing agent and a desulfurizing agent in the steel industry, and in recent years, due to the great fluctuation of the international market petroleum price and the adjustment of the structure and policy of the domestic related industry, the traditional calcium carbide industry with high energy consumption, high pollution and low benefit faces serious challenges, so that the calcium carbide industry in China will develop towards the direction of intensification, maximization, energy conservation and environmental protection in the future. The traditional calcium carbide preparation process has higher production cost, adopts blocky carbon raw materials and lime, and has the defects of low mass transfer and heat transfer efficiency, lower reaction rate and incapability of meeting market requirements in the aspects of overall energy consumption and product economy. Meanwhile, conventional plasma arc technology is also evaluated as pyrolysis destruction for treating such organic waste, which uses a continuous plasma arc technology to pyrolyze the organic waste under a high temperature pyrolysis chamber (for example, 5000 ℃ to 15000 ℃) which often requires high power input, and the generated gas requires combustion with air, and toxic gas (for example, nitrogen oxides) is formed after the combustion. The crude gas produced by pyrolysis in a carbonization furnace at about 80 ℃ needs to be subjected to indirect cooling process, a circulating ammonia water pump is used for spraying and cooling the crude gas for recycling, the separated tar and ammonia water enter a circulating tank through a gas/liquid separator, the clarified and separated ammonia water is injected into an ammonia water intermediate tank, the clarified and separated tar flows to the tar intermediate tank automatically, is pumped into a tar storage tank through a tar pump, is subjected to standing, heating, dehydration and deamination in the storage tank to form finished tar, and the finished tar is led out from the storage tank into a deep processing workshop or is transported and sold outside through a tar pump. The gas led out from the upper part of the gas/liquid separator enters the bottom of the primary cooling tower, is cooled to 25-30 ℃ by using a second stage of circulating cooling water, enters the electric tar precipitator, is pressurized by a gas fan, is sent into a gas storage tank, is sent to a hot blast stove for combustion by 40 percent, provides a heat source for carbonization of lump coal, and the remaining 60 percent of gas is sent to a tar hydrogenation workshop for hydrogen extraction, can also provide a heat source for self-contained power plant for power generation or be sold to other enterprises for use as a heat source, and a large amount of wastewater generated by a gas purification treatment system is sent to a wastewater purification treatment workshop for purification treatment. At the same time, conventional processes produce large amounts of phenolic wastewater and tar that are further treated with pollution abatement equipment such as scrubbers, demisters and sacks for particulate removal, and furthermore, the tar is typically placed in a warehouse that presents a risk to personnel living around the warehouse, and in addition, there are potential transportation risks during transportation of chemicals from the warehouse to the point of sale. Disclosure of Invention The invention provides a method for preparing calcium coal pellets by utilizing sliding arc plasma system pyrolysis, which aims to solve the problems of high cost, environmental protection and low added value caused by adopting a traditional method for preparing the calcium coal pellets in the prior art. A method for preparing calciferous pellets by pyrolysis with a sliding arc plasma system comprising a calciferous pellet preparation unit, a pyrolysis chamber, a sliding arc refor