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Steam-air preheating device and system

An air preheating and steam technology, applied in the boiler field, can solve the problems of reducing the heat absorption rate of the system, prone to water hammer, waste of condensed water energy, etc., to reduce steam extraction, improve heat exchange efficiency, and avoid water hammer Effect

Pending Publication Date: 2019-05-24
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned steam-type air preheater has a large amount of steam extraction, which wastes the energy of condensed water, seriously loses the high-quality performance of steam, reduces the heat absorption rate of the system, and is prone to water hammer

Method used

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  • Steam-air preheating device and system
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  • Steam-air preheating device and system

Examples

Experimental program
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Effect test

Embodiment 1

[0036] At present, boilers in power plants mostly use steam-type air preheaters, and the primary air is preheated through two-stage steam heating surfaces in the low-pressure section and the high-pressure section in turn. The primary air is first heated by the low-pressure heating surface of the turbine extraction steam, and then heated by the high-pressure heating surface of the steam drum extraction. The condensed water produced by the two-stage steam heating is sent to the deaerator through the drain pipe respectively.

[0037] However, the above-mentioned air preheater is only heated by extracting steam from the low-pressure steam turbine and steam from the high-pressure drum, and the extraction of steam is relatively large. The condensed water generated after the two-stage heating directly enters the deaerator, wasting the energy of the condensed water. The high-quality performance of the steam is seriously lost, and the heat absorption rate of the system is reduced. In ad...

Embodiment 2

[0053] figure 2 A schematic structural diagram of a steam air preheating device provided in Embodiment 2 of the present invention, on the basis of the above technical solution, optionally, refer to figure 2 , the first steam extraction pipeline 430 is a steam drum extraction pipeline, and the inlet header 410 of the high-pressure steam heat exchange section 400 communicates with the boiler drum through the steam drum extraction pipeline;

[0054] The second steam extraction pipe 330 is a steam turbine extraction pipe, and the inlet header 310 of the low-pressure steam heat exchange section 300 communicates with the steam turbine through the steam turbine extraction pipe.

[0055] The drum steam extraction pipe can extract the high-pressure steam in the boiler drum and enter the high-pressure steam heat exchange section 400 through the inlet header 410 .

[0056] The steam turbine extraction pipeline enters the low-pressure steam heat exchange section 300 through the inlet h...

Embodiment 3

[0092] This embodiment also provides a steam air preheating system, Figure 4 It is a schematic structural diagram of a steam air preheating system provided by an embodiment of the present invention. Optionally, refer to Figure 4 , the system includes the steam air preheating device provided by any embodiment of the present invention; wherein,

[0093] The first extraction pipe 430 of the high-pressure steam heat exchange section 400 is connected to the boiler drum 710;

[0094] The second steam extraction pipeline 330 of the low-pressure steam heat exchange section 300 is connected to the steam turbine 720;

[0095] The fourth drain pipe 230 of the condensed water heat exchange section 200 is connected with the deaerator 730 .

[0096] In actual application, the air to be preheated at the inlet 110 can be driven by the fan to flow into the box 100, and then pass through the condensed water heat exchange section 200, the low-pressure steam heat exchange section 300, and the...

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Abstract

The embodiment of the invention discloses a steam-air preheating device and system. The steam-air preheating device comprises a box body, a condensate heat-exchange section, a low-pressure steam heat-exchange section, a high-pressure steam heat-exchange section and a flash tank; an inlet header of the high-pressure steam heat-exchange section is connected with a first steam-extraction pipeline, and an outlet header of the high-pressure steam heat exchange section is connected with an inlet of the flash tank; an inlet header of the low-pressure steam heat-exchange section is connected with a second steam-extraction pipeline and a first outlet of the flash tank; and an inlet header of the condensate heat-exchange section is connected with an outlet header of the low pressure steam heat-exchange section and a second outlet of the flash tank. The steam-air preheating device and system achieves the effects that steam and condensate are effectively utilized to recover heat, the heat-exchangeefficiency is improved and the steam extraction amount is decreased, the water hammer phenomenon is avoided, and operation of the system is more economical, more efficient, safer and more reliable.

Description

technical field [0001] The embodiment of the present invention relates to boiler technology, in particular to a steam air preheating device and system. Background technique [0002] The air preheater is a device that increases the temperature of the boiler supply air by preheating the air before entering the boiler. It has the functions of increasing the combustion temperature in the furnace, improving combustion efficiency, saving fuel, and reducing flue gas emissions. In order to promote full combustion of fuel, the boiler needs to use an air preheater to increase the temperature of the primary air to about 200°C. Because there are more acid gases in the flue gas at the tail of the boiler and are highly corrosive, if the waste heat of the flue gas is used to heat the primary air through the air preheater, there will be serious problems of dust accumulation and corrosion, which will shorten the service life of the air preheater , affect the normal operation of the boiler. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/02F28D7/08F22D1/50
CPCY02E20/34
Inventor 陈琪华何育恒李茂东曾永忠杨波叶柳林傅志锋
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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