Circulating fluidized bed boiler combusting low calorific value gas fuel

A low calorific value gas and circulating fluidized bed technology, which is applied in the direction of fuel burning in a molten state, fluidized bed combustion equipment, combustion types, etc., can solve problems such as immature products, and achieve environmental protection emissions, stable combustion, and The effect of meeting emission standards

Inactive Publication Date: 2010-06-09
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And it can be burned with a lower calorific value of 200-2500kJ / Nm 3 Gas fuel combustion equipment within the scope, there are no mature products at home and abroad

Method used

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  • Circulating fluidized bed boiler combusting low calorific value gas fuel
  • Circulating fluidized bed boiler combusting low calorific value gas fuel
  • Circulating fluidized bed boiler combusting low calorific value gas fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the embodiments.

[0021] see figure 1 , figure 2 , a circulating fluidized bed boiler that burns low-calorific-value gaseous fuels, including a furnace wall 1, the cavity formed by the furnace wall 1 is the furnace, an air distribution plate 7 is arranged at the bottom of the furnace, and an air chamber 8 is arranged below the air distribution plate 7, Furnace smokestack 12 is arranged on the upper part of the furnace, and limestone feeding pipe 4, return pipe 5, slag discharge pipe 6, gas feeding pipe 9 outside the furnace, auxiliary fuel feeding pipe 10, inert material Feed into tube 11.

[0022] see figure 1 , Fuel gas feed pipe 2 in the center of the furnace passes through the air chamber 8 and the air distribution plate 7 into the center of the furnace in the vertical direction. see figure 2 , The gas feed pipe 2 in the hearth center passes into the dense-phase area of ​​the hearth ...

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Abstract

The invention discloses a circulating fluidized bed boiler combusting low calorific value gas fuel. Partial or entire exhaust gas is sent into a hearth through an air distribution plate, horizontally or vertically arranged hearth center fuel gas feeding pipes and an external fuel gas feeding pipe at the peripheral wall of the hearth ; partial or entire air is sent into the hearth through an air chamber on the air distribution plate, and the residual air is sent into the hearth through the peripheral wall of the hearth; and an external heat source is utilized to heat inert materials (coal slag or sand and the like) in the hearth, and then the exhaust gas and the air are mixed uniformly by utilizing the thermal storage of high-concentration materials at the lower part of the hearth and the kinetic energy of fluidized materials, and are heated to an ignition temperature to be combusted. The boiler controls the production of NOx through low-temperature combustion when realizing the combustion of the low calorific value gas fuel that a low calorific value is between 200 and 2,500kJ / Nm3, and can realize the standard discharge of pollutants.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a circulating fluidized bed boiler burning low calorific value gas fuel. Background technique [0002] Due to the high moisture content and low calorific value of lignite, long-distance transportation is uneconomical. In order to improve the transportation economy of lignite, lignite upgrading technology can be used to reduce the moisture content of lignite and improve the quality of lignite. In some lignite upgrading technology processes, a large amount of low calorific value gas will be produced due to mild chemical reactions. Its main characteristics include: a. The gas contains a small amount of CO and H 2 and CH 4 Combustible gas composition, but the calorific value is very low, the lower calorific value is about 200-2500kJ / Nm 3 , the existing various boilers are difficult to burn because of fire extinguishing during combustion; b. The water vapor share is large, abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/00F23C10/18F23C10/22
Inventor 肖平徐正泉江建忠郭涛李强时正海吕海生蒋敏华高洪培
Owner XIAN THERMAL POWER RES INST CO LTD
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