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Parallel mixed combustion system and method

A mixed combustion and boiler technology, which is applied in steam generation devices, sustainable manufacturing/processing, climate sustainability, etc., can solve problems such as the deterioration of stable combustion of boilers, incomplete combustion of biomass, and impact on the quality of boiler ash and slag. The effect of avoiding instability, ensuring quality, improving parameters and overall conversion efficiency

Inactive Publication Date: 2016-05-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, existing boilers are generally built according to specific fuels, and the amount of flue gas generated is relatively stable. Therefore, if the flue gas exceeds a certain limit, it is difficult for the heat exchanger to work normally.
The instability of biomass fuel deteriorates the stable combustion of the boiler; the melting point of biomass ash is low, which is prone to slagging; the incomplete combustion of biomass affects the quality of boiler ash
Indirect co-combustion of biomass and coal for power generation avoids the problem of low melting point of ash and easy slagging, but is limited by the type of fuel

Method used

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Embodiment Construction

[0019] The present invention provides a parallel mixed combustion system and method, which will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] A parallel mixed combustion system consisting of a biomass direct-fired boiler and a pulverized coal boiler;

[0021] The biomass direct-fired boiler includes a storage bin 1 connected in sequence, a fire grate 2, a superheater 3, an economizer 4, an air preheater 5 and a dust collector 6, and a steam delivery device at the outlet of the superheater 3 11. The grate 2 is located at the bottom of the biomass direct-fired boiler, the storage bin 1 is located on the left side of the biomass direct-fired boiler, and the superheater 3 is set in the middle section of the biomass direct-fired boiler; at the far right of the biomass direct-fired boiler An economizer 4 is arranged in the vertical flue on the side, and an air preheater 5 is arranged below the economizer 4; a dust collect...

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Abstract

The invention belongs to the technical field of biomass application and particularly relates to a parallel mixed combustion system and method. The parallel mixed combustion system is composed of a biomass direct-fired boiler and a pulverized coal fired boiler, wherein biomass fuel in a storage bin enters the biomass direct-fired boiler through a conveying device and combusts on a fire grate to generate heat which is exchanged with heat of a superheater, and the generated low-parameter steam is conveyed to an inlet of a low-temperature reheater of the pulverized coal fired boiler through a steam conveying device; and smoke of the biomass direct-fired boiler is conveyed to the front side of an induced draft fan of the pulverized coal fired boiler after passing through a coal economizer, an air preheater and a dust collector, is introduced to a chimney and is discharged into the atmosphere. According to the parallel mixed combustion system, a biomass combustion system is completely separated from a coal combustion system, and the low-parameter steam generated by the biomass direct-fired boiler is conveyed to the coal fired boiler, so that parameters and the overall conversion efficiency are increased.

Description

technical field [0001] The invention belongs to the technical field of biomass application, and in particular relates to a parallel mixed combustion system and method. Background technique [0002] At present, biomass power generation technologies mainly include biomass direct combustion power generation and biomass and coal hybrid power generation. Biomass direct combustion power generation technology is to send agricultural and forestry biomass directly to the boiler for combustion, and the high-temperature and high-pressure steam generated drives the steam turbine to do work and drives the generator to generate electricity. The biomass and coal mixed power generation system is a thermal power generation that uses straw and coal as mixed fuel. [0003] Generally, the installed capacity of a single unit of a biomass direct-fired power plant is 12MW or 25MW, and the corresponding boiler evaporation is at the level of 75t / h and 130t / h, and the grate layer combustion technolo...

Claims

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Application Information

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IPC IPC(8): F22B33/00
CPCF22B33/00Y02P80/15
Inventor 鲁许鳌杨建蒙张穆勇马凯王睿坤周兆伦李永强杜斌
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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