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Natural circulation coupled cfb steam injection boiler at the end of the direct current vertical evaporation tube in the furnace

A technology of natural circulation and steam injection boilers, applied in steam boilers, steam generation, steam separation devices, etc., can solve problems such as tube bursts, heat transfer deterioration, and water-cooled wall tubes that are prone to salt scaling, and solve the problem of tube bursts, Guarantee the effect of safe and stable operation

Active Publication Date: 2016-08-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing natural circulation oil field steam injection boiler has the problem that the inner wall of the water wall tube is prone to salt scale, which will lead to the deterioration of heat transfer and the tube burst in the long run, and then provide natural circulation at the tail of the direct-flow vertical evaporation tube in the furnace Coupled CFB Steam Injection Boiler

Method used

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  • Natural circulation coupled cfb steam injection boiler at the end of the direct current vertical evaporation tube in the furnace
  • Natural circulation coupled cfb steam injection boiler at the end of the direct current vertical evaporation tube in the furnace
  • Natural circulation coupled cfb steam injection boiler at the end of the direct current vertical evaporation tube in the furnace

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specific Embodiment approach 1

[0021] Specific implementation mode one: as figure 1 with figure 2 As shown, the natural circulation coupled CFB steam injection boiler at the tail of the vertical evaporating tube in the furnace includes furnace body 1, connecting pipe 1 2a, connecting pipe 2 2b, economizer water outlet main pipe 7, connecting pipes 8 on both sides, front and rear walls Connecting pipe 9, primary air duct 12, secondary air duct 13, cyclone separator 15, downcomer 16, steam connecting pipe 17, connecting pipe 3 18, superheater 19, evaporator 20, economizer 21, secondary air Air preheater 22, primary air air preheater 23, return valve 24, sewage pipe 27 and tail flue 30; the furnace body 1 is a circulating fluidized bed, and the bottom of the furnace body 1 is provided with a primary air Chamber 26, the bottom of the furnace body 1 is provided with a slag outlet 35, the lower end of the slag outlet 35 passes through the primary air chamber 26, the lower part of the front wall of the furnace b...

specific Embodiment approach 2

[0025] Specific implementation mode two: as figure 1 As shown in the specific embodiment 1, the natural circulation coupled CFB steam injection boiler at the tail of the direct-flow vertical evaporating tube in the furnace, the angle between the evaporator 20 and the horizontal plane is α, α=5~10°.

specific Embodiment approach 3

[0026] Specific implementation mode three: as figure 2 with image 3 As shown, the natural circulation coupled CFB steam injection boiler at the tail of the direct-flow vertical evaporation tube in the furnace includes furnace body 1, connecting pipe 1 2a, connecting pipe 2 2b, economizer outlet water main pipe 7, and two side walls (that is, furnace body 1 Left and right side walls) connecting pipe 8, front and rear wall connecting pipe 9, primary air duct 12, secondary air duct 13, cyclone separator 15, descending pipe 16, steam connecting pipe 17, connecting pipe 3 18, superheater 19, evaporator 20. Economizer 21, secondary air air preheater 22, primary air air preheater 23, return valve 24, sewage pipe 27, tail flue 30, water cooling screen 31 and connecting pipe four 34; The furnace body 1 is a circulating fluidized bed, the bottom of the furnace body 1 is provided with a primary air chamber 26, the bottom of the furnace body 1 is provided with a slagging port 35, and t...

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Abstract

The invention provides a natural circulation coupling-type CFB steam injection boiler at the tail end of a direct current vertical evaporating pipe inside a boiler, and belongs to the technical field of oil field steam injection boilers. The problem of the pipe explosion caused by the heat transferring deterioration due to the fact that salt deposits are deposited on the inner wall of a water screen wall pipe of an existing natural circulation oil field steam injection boiler in the long-term is solved. A coal economizer is communicated with a two-side wall connecting pipe and a front-and-rear wall connecting pipe through a main water discharging pipe of the coal economizer. The two-side wall connecting pipe is communicated with an upper two-side wall collecting box through a lower two-side wall water screen wall collecting box and a two-side wall membrane water screen wall. The front-and-rear wall connecting pipe is communicated with a front-and-rear wall collecting box through a lower front-and-rear wall collecting box and a front-and-rear wall membrane water screen wall. The upper two-side wall collecting box and the front-and-rear wall collecting box are communicated with a steam pocket. Water space of the steam pocket is communicated with a water inlet of an evaporator through a descending pipe. A steam-water mixture outlet of the evaporator is communicated with a second steam-water separator through a third connecting pipe. A steam space of the steam pocket is communicated with a super heater through a steam connecting pipe. The natural circulation coupling-type CFB steam injection boiler is used for oil field steam injection.

Description

technical field [0001] The invention relates to a circulating fluidized bed steam injection boiler, which belongs to the technical field of oil field steam injection boilers. Background technique [0002] Most of the existing steam injection boilers in oilfields are oil-fired and gas-fired direct-flow steam-injection boilers. In order to save operating costs, some units have developed coal-fired seam-fired direct-flow steam injection boilers. The implementation of the pollutant discharge standard GB13271-2014 has made the layer-fired steam injection boiler lose the favor of the market. This is because the NOx emission concentration of the layer-fired furnace is much higher than the existing emission standard, and the furnace cannot desulfurize, which makes the environmental protection investment even high. Investment in the boiler itself. So people turn their attention to circulating fluidized bed boilers, because the NOx emission concentration of circulating fluidized bed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B31/08F22B35/02F22B37/26
Inventor 别如山宋兴飞别海培纪晓瑜陈佩房点李鹏坤顾文波
Owner HARBIN INST OF TECH
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