Discrete low grade residue heat recovery boiler high temperature water-supply and air preheater system

A technology of waste heat recovery and boiler feed water, which is applied in the process transformation of boiler blast pipes and boiler feed water pipes, and can solve the problems of narrow application range, no heat recovery and utilization, and high initial investment

Inactive Publication Date: 2007-10-17
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, similar products at home and abroad try to recycle waste heat, such as providing domestic water, but there are probl

Method used

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  • Discrete low grade residue heat recovery boiler high temperature water-supply and air preheater system
  • Discrete low grade residue heat recovery boiler high temperature water-supply and air preheater system
  • Discrete low grade residue heat recovery boiler high temperature water-supply and air preheater system

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Embodiment Construction

[0013] Referring to Figure 2, before the tap water supplied to the boiler enters the economizer 3, it is preheated by using the heat of the sewage discharged from the sewage tank of the boiler room. The tap water (water temperature is about 20 degrees) is preheated first, and the air primary preheating system adds an air and water heat exchanger 4 before the air enters the air preheater 5, and recovers boiler blowdown, oxygen removal and drainage, and user waste heat, etc. and other forms energy of. Preliminarily preheating the air can reduce the heat absorbed by the original air preheater and improve the efficiency of the economizer.

[0014] Referring to Fig. 3, a water-water heat exchanger 8 with an appropriate area is installed in front of the deaerator 6 after the boiler feed water enters the economizer 3 in the sewage tank 2, and the tap water passing through the economizer 3 is further heated, so that The feed water entering the boiler is increased from the original 10...

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Abstract

The present invention discloses a boiler high temperature water feeding and air preheating system for reclaiming dispersed low grade residual heat which includes a pollution discharge pool (2), a coal economizer (3), an air preheater (5) and a boiler furnace (7). The pollution discharge pool (2) is buried with a pipe heat exchanger (1) connected to the tap water in front of the coal economizer (3), or the pollution discharge pool (2) is mounted with a water-water heat exchanger (8) after the boiler water enters the coal economizer (3) and before a deaerator (6); a heat exchanger (4) disposed at the user residual heat place is connected to the air preheater (5) in the front of the boiler furnace (7). The invention is a boiler high temperature water feeding and air preheating system for reclaiming dispersed low grade residual heat which can realize the boiler blowdown heat reclamation, and can reclaim the low grade energy exhausted to environment from the system on the base that the components of the thermoelectric boiler are running steadily.

Description

technical field [0001] The invention relates to a boiler feed water and air preheating system, in particular to a boiler high-temperature feed water technology that recovers and utilizes discrete low-grade waste heat with stable feed water flow and stable equipment operation, and a boiler based on recovery of waste heat from boiler blowdown water. Technological transformation of water supply pipes and boiler blast pipes passing through the pre-air preheater. Background technique [0002] In the boiler room of a thermal power plant, there are many steam drainage points (see Figure 1 for the flow chart of the thermal power plant boiler system). It comes from the output part of the boiler; for domestic steam that is too small and too scattered, it can only be discharged directly; for boiler blowdown (regular or continuous), there is a high-temperature sewage pool in the boiler room, and its heat is naturally lost. About 8-10% of the average steam production, about 10% of soft ...

Claims

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Application Information

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IPC IPC(8): F22D1/36F22B1/16
Inventor 龚光彩陈飞虎王瑞
Owner HUNAN UNIV
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