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Waste heat boiler expansion economizer system with first-stage deoxidizing heat source

A waste heat boiler and economizer technology, applied in feed water heaters, preheating, chemical instruments and methods, etc., can solve the problems of high oxygen content in desalted water supply and oxygen corrosion, achieve good economic benefits, and improve oxygen corrosion , the effect of improving thermal efficiency

Pending Publication Date: 2022-02-18
中国船舶重工集团公司第七0三研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the condensed water of the back pressure unit responsible for external steam supply cannot be recovered again, resulting in a high oxygen content in the desalted water supplied by the unit to the waste heat boiler. If it does not deoxygenate and directly enters the boiler system, it will lead to serious oxygen corrosion.

Method used

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  • Waste heat boiler expansion economizer system with first-stage deoxidizing heat source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] combine figure 1 , a waste heat boiler extended economizer system with a first-stage deoxygenation heat source, including: extended economizer body 1, outlet flue 2, recirculation pump group 3 (including pump 3.1, outlet electric valve 3.2), water Heat exchanger 4 (including water-to-water heat exchanger primary side inlet regulating valve group 4.1, bypass electric valve group 4.2, secondary side inlet electric valve group 4.3, secondary side outlet electric valve group 4.4), feed water pump group 5 ( Including feedwater pump 5.1 and outlet electric valve group 5.2), primary deaerator 6 (including heat source regulating valve group 6.1).

[0014] The extended economizer body 1 is located in the outlet flue 2; the middle suction port of the extended economizer body 1 is connected to the recirculation pump group 3 through pipelines; the inlet of the extended economizer body 1 is connected to the feed water pump group 5 through pipelines connection; the recirculation pum...

Embodiment 2

[0017] When the distributed energy station is in a transitional season (spring or autumn), that is, when no external heat source water is required, the primary side inlet regulating valve group 4.1 of the water-to-water heat exchanger 4 is in the closed state, and the bypass electric valve group 4.2 is in the open state state;

[0018] The 45°C feed water of the boiler enters the inlet of the extended economizer body 1 and gradually absorbs the temperature of the exhaust gas in the outlet flue 2, and the feed water is heated in the extended economizer body 1; part of the high-temperature hot water at 180-190°C is directly from The outlet of the extended economizer body 1 is supplied to the secondary deaerator or the low-pressure steam drum, and the other part of hot water at 140-150°C is fed by any one of the recirculation pumps 3 from the middle outlet of the extended economizer body 1 The pump is pulled out, and the two pumps are used and the other is used, which is convenie...

Embodiment 3

[0022] When the distributed energy station is in winter or summer, that is, when external heat source water is required:

[0023] At this time, compared with the condition that no external heat source water is required, it is only necessary to close the water-water heat exchanger bypass electric valve group 4.2, so that 150°C hot water passes through the primary side of the water-water heat exchanger, and the cold source on the secondary side After exchanging heat, the temperature of the hot water on the primary side drops to 70°C, and the flow thereafter is consistent with the flow in the transition season, part of which returns to the inlet of the economizer, part of which goes to heat the first-stage deaerator to make up water, and the secondary output of the water-to-water heat exchanger Hot water goes to the user side. The adjustment of the two operating conditions is to realize the operation and exit of the water-water heat exchanger by opening or closing the water-water...

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Abstract

The invention belongs to the technical field of combined cooling heating and power generation of distributed energy stations, and particularly relates to a waste heat boiler expansion economizer system with a first-stage deoxidizing heat source. According to the invention, a heat source with a lower temperature can be used as a first-stage deoxidization heating heat source, and only the replenished water needs to be heated to 45 DEG C, so that more heat sources for heating the replenished water to 105 DEG C in the conventional atmospheric deoxidization are avoided. Due to the fact that the boiler feed water temperature is low, and a large temperature end difference is formed between the boiler feed water temperature and the flue outlet smoke temperature, the boiler exhaust gas temperature can be reduced, the efficiency can be improved by 4-6% compared with that of an atmospheric deoxidization and waste heat boiler, the heat efficiency of the whole unit is improved, and the complex processes that a flue gas heat exchanger is independently arranged at the flue outlet and hot water is supplied to the outside are avoided. Hot water can be provided for a user, the hot water after heat exchange can be used as a heat source for primary deoxidization, the oxygen content of feed water of the waste heat boiler is reduced to 50 micrograms / L, and the oxygen corrosion condition of an extended economizer is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of combined cooling, heating and power generation in distributed energy stations, and in particular relates to an extended economizer system for a waste heat boiler with a first-stage deoxygenation heat source. Background technique [0002] The trigeneration of the distributed energy system conforms to the principle of "cascade utilization" of energy use and has a high energy utilization rate. It can not only provide high-grade electric energy, but also provide steam and hot water, and further provide refrigeration. Among them, the condensed water of the back pressure unit responsible for external steam supply cannot be recovered again, resulting in a high oxygen content in the desalted water supplied by the unit to the waste heat boiler. If it does not deoxygenate and directly enters the boiler system, it will lead to serious oxygen corrosion. . On the other hand, in addition to providing high-temperature...

Claims

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Application Information

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IPC IPC(8): F22D1/50
CPCF22D1/50
Inventor 吴穷董自春王义方
Owner 中国船舶重工集团公司第七0三研究所