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Binary cycle power generation system and method for pre-drying and pyrolysis staged conversion of low-rank coal

A technology for cycle power generation and low-rank coal, applied in special forms of dry distillation, machine/engine, direct heating dry distillation, etc. The effect of unstable combustion temperature, improved energy density, and improved workability

Active Publication Date: 2015-03-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pyrolysis technology adopts the solid heat carrier method, the loss of fly ash in the heat carrier is large, the wear is serious, and it needs to be added regularly during operation
Moreover, the pyrolysis semi-coke obtained in the existing pyrolysis technology will lose a large amount of sensible heat during cooling, which reduces the pyrolysis efficiency; in addition, the composition of pyrolysis volatiles is complex, and the tar cooling process is likely to cause pipeline blockage

Method used

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  • Binary cycle power generation system and method for pre-drying and pyrolysis staged conversion of low-rank coal

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Experimental program
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Effect test

Embodiment 1

[0040] Such as figure 1 As shown, a low-rank coal pre-drying pyrolysis staged conversion dual-fluid cycle power generation system, the power generation system is mainly composed of low-rank coal pre-drying pyrolysis unit, gas-steam dual-fluid cycle power generation unit and conventional steam cycle power generation unit three parts composition,

[0041] The low-rank coal pre-drying pyrolysis unit includes a pyrolyzer 1, the semi-coke outlet of the pyrolyzer 1 is connected to a conventional steam cycle power generation unit, and the heat carrier of the conventional steam cycle power generation unit returns to the pyrolyzer 1; The outlet of the pyrolysis volatile matter is connected to the drying filter 2; the wet material inlet of the drying filter 2 is connected to the silo 3, the dry material outlet of the drying filter 2 is connected to the material inlet of the pyrolyzer 1, and the drying filter 2 is also connected It is connected to the dust collector 4, and the dust coll...

Embodiment 2

[0058] Scheme: use the system of the present invention to build a thermal power plant

Embodiment 3

[0062] Scheme: Transform thermal power plant with system of the present invention

[0063] method of execution:

[0064] Using Example 1 figure 1 In the system and method shown, the power plant newly installs a pyrolyzer, a dry filter and a downstream purifier, and newly purchases a set of gas-steam dual-fluid power generation system. Retain the steam turbine unit, air supply system and auxiliary system of the old power plant, and make some changes to the boiler coal feeding device so that it can be converted to burn high-temperature semi-coke. Connect the old power plant storage bin to the newly installed filter drier inlet, and the boiler feed inlet to the coke bin. The power generation efficiency of the modified power plant is estimated as follows: the efficiency of coal pyrolysis is 95%, the pyrolysis gas after coal pyrolysis contains 30% energy, and the semi-coke contains 70% energy. The steam cycle power generation efficiency of the old power plant is 35%, and the gas...

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Abstract

The invention discloses a binary cycle power generation system and method for pre-drying and pyrolysis staged conversion of low rank coal. The system is composed of a low rank coal pre-drying pyrolysis unit, a gas-steam binary cycle generation unit and a conventional steam cycle power generation unit. The method is as below: pyrolyzing the coal by using the heat provided by circulation of a solid heat carrier; sending solid semicoke into a boiler for conventional steam power generation; pyrolyzing the volatile matters and drying the wet coal; at the same time removing tar by desorption; pyrolyzing dry coal and adsorbed tar in a pyrolyzer; sending the pyrolyzed volatile matters after adsorption into a subsequent purification device; sending the pyrolysis gas after purification into a gas turbine combustion chamber; and spraying steam by multiple levels, so that the high temperature binary fluid working medium works in turbine. Compared with the conventional coal-fired power generation technology, the invention can increase the power generation efficiency and reduce pollutant emissions, and is applicable to both construction of new power plants and transformation of old power plants.

Description

technical field [0001] The invention relates to the technical field of coal power generation, in particular to a dual-fluid cycle power generation system and method for low-rank coal pre-drying pyrolysis staged conversion. Background technique [0002] Coal will remain my country's main energy source for a long time to come. Realizing the efficient and clean utilization of coal is an urgent problem to be solved in our country. Thermal power generation consumes half of my country's coal resources. Improving the efficiency of thermal power generation and reducing pollution emissions is a strategic choice to achieve sustainable economic development. [0003] At present, the power generation efficiency of supercritical thermal power units in my country is about 42%, which burns coal in boilers to produce steam with supercritical parameters to drive steam turbines to generate power. The quality and energy conversion methods of coal and gas fuels are different, so that the power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B49/16C10B57/10C10B57/00F02C6/00F01K11/02
CPCC10B49/16C10B53/04C10B57/00C10B57/10F01K11/02F02C6/00
Inventor 宋文立李昱喆郝丽芳李松庚范垂钢都林
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI