Circulating fluidized bed boiler suitable for stone coal combustion with extremely low calorific value
A technology of circulating fluidized bed and calorific value, which is used in fluidized bed boilers, fuels burned in a molten state, combustion chambers, etc., to achieve stable combustion, maintain bed temperature, and compact structure.
Pending Publication Date: 2019-08-02
广东东实开能能源有限公司 +4
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But at present, the incineration boiler with a pure calorific value of about 850 kcal of stone coal is still blank
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[0020] The present invention is further described in conjunction with the following examples.
[0021] In this embodiment, a low-quality stone coal is used as the boiler fuel for illustration, and its low calorific value is about 800-900 kcal / kg.
[0022] A specific embodiment of a circulating fluidized bed boiler suitable for the combustion of extremely low calorific value stone coal in this application, its structure includes a furnace 1, a buried pipe 2 installed on the inner wall of the furnace 1, and an air distribution plate 3 installed on the inner wall of the furnace 1 And the high-temperature cyclone separator 4 communicating with the furnace 1 is characterized in that: it also includes a bypass cold ash machine 5 and a U-shaped flue communicated with the discharge port of the high-temperature cyclone separator 4, and the exhaust gas of the high-temperature cyclone separator 4 The mouth is connected with the U-shaped flue; the U-shaped flue includes the first vertical...
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The invention relates to the technical field of boilers, in particular to a circulating fluidized bed boiler suitable for stone coal combustion with extremely low calorific value. The circulating fluidized bed boiler comprises a hearth, buried pipes, an air distribution plate and a high-temperature cyclone separator, wherein the buried pipes are arranged on the inner wall of the hearth, the air distribution plate is arranged in the hearth, and the high-temperature cyclone separator communicates with the hearth; and the circulating fluidized bed boiler further comprises a bypass cooler and a U-shaped flue which communicates with a discharge port of the high-temperature cyclone separator, and an exhaust port of the high-temperature cyclone separator communicates with the U-shaped flue; theU-shaped flue comprises a first vertical flue and a second vertical flue; a primary evaporator, a primary superheater, a secondary superheater, a secondary evaporator, a primary air preheater, a first-stage coal economizer and a second-stage coal economizer are sequentially arranged in the first vertical flue; and a third-stage coal economizer, a second-stage coal economizer, a second-stage air preheater and a third-stage air preheater are sequentially arranged in the second vertical flue. The circulating fluidized bed boiler can stability combust the high-ash-content, low-volatile-matter anddifficult-to-combust inferior stone coal with the stable combustion heat value of about 750-950 kcal / kg.
Description
technical field [0001] The invention relates to the technical field of boilers, in particular to a circulating fluidized bed boiler suitable for burning rock coal with extremely low calorific value. Background technique [0002] Stone coal is a fuel with low carbon content, high ash content, and low calorific value, and it is also a low-grade polymetallic symbiotic ore. Stone coal is formed from biological remains such as bacteria and algae in the geological period 400 million to 500 million years ago, which were transformed through saprolification and coalification in a shallow sea environment. It is grayish and dull, mixed with more pyrite, quartz veins and phosphorus and calcareous nodules. The calorific value of stone coal is not high, generally around 800 kcal / kg, and it is a low calorific value fuel. my country is one of the few countries in the world with stone coal resources, mainly distributed in Hunan, Hubei, Anhui, Jiangxi, Zhejiang and other coal-deficient prov...
Claims
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IPC IPC(8): F23C10/10F22B31/00F22B31/08F23J15/06F23C10/20F23M5/08
CPCF23C10/10F22B31/0007F22B31/08F23J15/06F23C10/20F23M5/08
Inventor 丁贵武李平刘学炉刘楷陶海常
Owner 广东东实开能能源有限公司