CFB steam injection boiler with buried pipe and evaporating coil coupled direct flow and natural circulation

A technology of evaporating coils and natural circulation, applied in steam boilers, steam generation, fluidized bed combustion equipment, etc., can solve problems such as tube bursts, heat transfer deterioration, and water-cooled wall tubes are prone to salt scaling, etc., to solve the problem of tube bursts problems, ensuring safe and stable operation, and the effect of eliminating pipe burst problems

Active Publication Date: 2016-08-24
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 circulating fluidized bed oil field steam injection boiler has the problem that the inner wall of the water wall tube is easy to form salt scale, which will lead to the deterioration of heat transfer and the tube burst in the long run, and further provides a buried tube And evaporating coil direct current and natural circulation coupled CFB steam injection boiler

Method used

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  • CFB steam injection boiler with buried pipe and evaporating coil coupled direct flow and natural circulation
  • CFB steam injection boiler with buried pipe and evaporating coil coupled direct flow and natural circulation
  • CFB steam injection boiler with buried pipe and evaporating coil coupled direct flow and natural circulation

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specific Embodiment approach 1

[0019] Specific implementation mode one: as Figure 1~Figure 5As shown, the direct current and natural circulation coupled CFB steam injection boiler with buried pipe and evaporating coil includes furnace body 1, connecting pipe 1, coal inlet 5, economizer water outlet main pipe 7, low-velocity bed air chamber 11, primary air Road 12, secondary air duct 13, secondary air duct 14, cyclone separator 15, downcomer 16, steam connecting pipe 17, connecting pipe 18, superheater 19, evaporator 20, economizer 21, secondary air Air preheater 22, primary air air preheater 23, return valve 24, high-speed bed air chamber 25, sewage outlet 27, steam drum 29, tail flue 30, slag discharge pipe 31, low-speed bed air distribution plate 36, High-speed bed distribution air plate 37, two connecting pipes two 4 and two connecting pipes three 6; Device two 28b, the bottom of the steam drum 29 is provided with a sewage outlet 27, the bottom of the furnace body 1 is provided with a high-speed bed ai...

specific Embodiment approach 2

[0021] Specific implementation mode two: as figure 1 As shown in the specific embodiment 1 of the direct current and natural circulation coupled CFB steam injection boiler with buried pipes and evaporator coils, the angle between the evaporator 20 and the horizontal plane is α, α=5~10°.

specific Embodiment approach 3

[0022] Specific implementation mode three: as figure 1 As shown, the CFB steam injection boiler with buried pipes and evaporation coils coupled with direct current and natural circulation described in Embodiment 1, the number of the evaporation coils 3 is one, and the outer diameter of the evaporation coils 3 (diameter ) is Φ51mm~Φ108mm.

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Abstract

The invention provides a direct-current and natural circulation coupled CFB steam injection boiler with buried pipes and evaporation coils, and belongs to the technical field of oil field steam injection boilers. The problem that heat transformer deterioration and pipe explosions can be caused when the inner walls of water-cooling wall pipes are prone to salt scale for a long time in existing natural circulation fluidized bed oil field steam injection boilers is solved. The lower ends of the buried pipes fixed to a front wall and a rear wall of a furnace body are all communicated with buried pipe lower collection boxes fixed to the outer side faces of the front wall and the rear wall of the furnace body. The upper ends of the buried pipes fixed to the front wall and the rear wall of the furnace body are all communicated with buried pipe upper collection boxes fixed to the outer side faces of the front wall and the rear wall of the furnace body. The water outlets of the two buried pipe upper collection boxes are communicated with lower collection boxes. The lower collection boxes are communicated with one ends of fifth connection pipes. The evaporation coils are wound around the inner circumferential side wall of the furnace body from bottom to top to form a hearth water-cooling wall. One ends of the evaporation coils are communicated with the other ends of the fifth connection pipes. The other ends of the evaporation coils are communicated with upper collection boxes. The upper collection boxes are communicated with a first steam-water separator in a steam pocket. The direct-current and natural circulation coupled 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 steam-injection boiler is much higher than the existing emission standard, and the furnace cannot desulfurize, which makes environmental protection investment Even higher than the investment of the boiler itself. So people turn their attention to circulating fluidized bed boilers, because the NOx emission concentration of circu...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): F22B31/00F23C10/18
Inventor别如山李鹏坤宋兴飞纪晓瑜陈佩房点顾文波
OwnerHARBIN INST OF TECH