CN212377960U - Waste heat recovery system of recycling of power boiler afterbody flue gas - Google Patents
Waste heat recovery system of recycling of power boiler afterbody flue gas Download PDFInfo
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- CN212377960U CN212377960U CN202020790270.8U CN202020790270U CN212377960U CN 212377960 U CN212377960 U CN 212377960U CN 202020790270 U CN202020790270 U CN 202020790270U CN 212377960 U CN212377960 U CN 212377960U
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Abstract
The utility model relates to a waste heat recovery system of recycling of power boiler afterbody flue gas, including boiler afterbody flue, compound phase change heat exchanger, demineralized water female pipe, oxygen-eliminating device, heat storage water tank, hot-water pipe network system, compound phase change heat exchanger set up the horizontal segment at boiler afterbody flue, compound phase change heat exchanger's water inlet and demineralized water female pipe tube coupling, compound phase change heat exchanger's play water female pipe on the one hand with the water inlet tube coupling of oxygen-eliminating device, on the one hand with heat storage water tank's water inlet tube coupling, be provided with the hot-water pump on heat storage water tank's play water outlet pipe, the water outlet female pipe of hot-water pump on the one hand with the water inlet tube coupling of oxygen-eliminating device, on the one hand with hot-water pipe network system tube coupling, all be provided with corresponding. This waste heat recovery of power boiler afterbody flue gas recycles system has reduced exhaust gas temperature through the recovery utilization power boiler tail smoke waste heat, has improved boiler system thermal efficiency, energy saving and consumption reduction.
Description
Technical Field
The utility model belongs to the technical field of energy recovery utilizes technique and specifically relates to a waste heat recovery system of recycling of power boiler afterbody flue gas is related to.
Background
When the exhaust temperature of the tail smoke of the power plant boiler rises by 20 ℃, the efficiency of the boiler is reduced by about 1%, the exhaust temperature is too high, huge energy loss is caused, the safety risk of the bag-type dust remover is increased, the water consumption of a desulfurization process is increased due to the high exhaust temperature, and the power consumption of a draught fan is increased due to the high exhaust temperature.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the waste heat recycling system for the tail flue gas of the power plant boiler is provided to achieve the purposes of recycling the waste heat of the tail flue gas of the power plant boiler, reducing the temperature of the discharged flue gas and improving the heat efficiency of a boiler system, and achieve the effects of saving energy, reducing consumption and improving the economic benefit of enterprises.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a waste heat recovery system of recycling of power boiler afterbody flue gas, is including boiler afterbody flue, compound phase change heat exchanger, the female pipe of demineralized water, oxygen-eliminating device, heat storage water tank, hot water pipe network system, compound phase change heat exchanger set up the horizontal segment at boiler afterbody flue, compound phase change heat exchanger's water inlet and the female pipe tube coupling of demineralized water, compound phase change heat exchanger's the female pipe of play water on the one hand with the water inlet pipe coupling of oxygen-eliminating device, on the one hand with heat storage water tank's water inlet pipe coupling, be provided with the hot-water pump on heat storage water tank's the play water pipeline, the female pipe of play water of hot-water pump on the one hand with the water inlet pipe coupling of oxygen-eliminating device, on the one hand with hot water pipe network.
The operation mode and the function of the system are as follows: the desalted water entering the composite phase-change heat exchanger from the desalted water main pipe generates hot desalted water with the temperature of more than 90 ℃ by absorbing the waste heat of flue gas (the flue gas temperature is about 140 ℃) in a flue at the tail part of the boiler (the flue gas temperature is reduced to about 115 ℃) after passing through the composite phase-change heat exchanger), and the generated hot desalted water is conveyed to the heat storage water tank and also directly conveyed to the deaerator; if the heat supply generator set is in high load, the heat storage water tank conveys the stored hot demineralized water to the deaerator through the hot water pump, so that the steam consumption (steam is used for heating the demineralized water) of the deaerator can be reduced, the rated heat supply of the heat supply generator set is increased, and the heat efficiency is improved; hot water in the heat storage water tank can be pumped into the hot water pipe network system through the hot water pump for use. The composite phase-change heat exchanger is a heat exchanger suitable for coal-fired, oil-fired and gas-fired power generation boilers and industrial boilers, and has high heat exchange efficiency; and the lowest wall surface temperature of the metal heating surface of the composite phase-change heat exchanger is in an adjustable state, so that the composite phase-change heat exchanger can adapt to the change of heat transfer load of a boiler within a relatively large range, the exhaust gas temperature and the wall temperature are kept relatively stable, the wall surface temperature of the metal heating surface is kept at a higher temperature level and is far away from a corrosion area of an acid dew point, and the phenomena of acid corrosion and ash blockage of the heat exchanger are fundamentally avoided.
The utility model has the advantages that: this waste heat recovery system of recycling of power boiler afterbody flue gas not only has reduced exhaust gas temperature through recycle power boiler tail smoke waste heat, makes the environmental protection of flue gas discharge treatment cost reduce, has improved boiler system's thermal efficiency moreover, has practiced thrift a large amount of energy to make the contribution for energy saving and consumption reduction, improvement enterprise economic benefits.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural view of the present invention (arrows in the figure indicate the flow direction of the demineralized water).
In the figure: 1. the boiler tail flue 2, the composite phase change heat exchanger 3, the demineralized water main pipe 4, the deaerator 5, the heat storage water tank 6, the hot water pipe network system 7 and the hot water pump.
Detailed Description
A waste heat recycling system for tail flue gas of a power plant boiler is shown in figure 1 and comprises a boiler tail flue 1, a composite phase change heat exchanger 2, a demineralized water main pipe 3, a deaerator 4, a heat storage water tank 5 and a hot water pipe network system 6, the composite phase change heat exchanger 2 is arranged at the horizontal section of the boiler tail flue 1, the water inlet of the composite phase change heat exchanger 2 is connected with the pipeline of the demineralized water main pipe 3, the water outlet main pipe of the composite phase change heat exchanger 2 is connected with the pipeline of the water inlet of the deaerator 4 on one hand and the pipeline of the water inlet of the heat storage water tank 5 on the other hand, a hot water pump 7 is arranged on a water outlet pipeline of the heat storage water tank 5, a water outlet main pipe of the hot water pump 7 is connected with a water inlet pipeline of the deaerator 4 on one hand and is connected with a hot water pipe network system 6 on the other hand, and corresponding valves are arranged in the connecting pipelines.
The operation mode and the function of the system are as follows: the desalted water entering the composite phase-change heat exchanger 2 from the desalted water main pipe 3 generates hot desalted water with the temperature of more than 90 ℃ by absorbing the waste heat of the flue gas (the flue gas temperature is about 140 ℃) in the flue 1 at the tail part of the boiler (the flue gas temperature is reduced to about 115 ℃ after the flue gas passes through the composite phase-change heat exchanger 2), and the generated hot desalted water is directly conveyed to the deaerator 4 besides being conveyed to the heat storage water tank 5; if the heat supply generator set is in high load, the heat storage water tank 5 conveys the stored hot demineralized water to the deaerator 4 through the hot water pump 7, so that the steam consumption (steam is used for heating the demineralized water) of the deaerator 4 can be reduced, the rated heat supply of the heat supply generator set is increased, and the heat efficiency is improved; hot water in the hot water storage tank 5 can be pumped into a hot water pipe network system 6 through a hot water pump 7 for use. The composite phase change heat exchanger 2 is a heat exchanger suitable for coal-fired, oil-fired and gas-fired power generation boilers and industrial boilers, and has high heat exchange efficiency; and the lowest wall surface temperature of the metal heating surface of the composite phase-change heat exchanger is in an adjustable state, so that the composite phase-change heat exchanger can adapt to the change of heat transfer load of a boiler within a relatively large range, the exhaust gas temperature and the wall temperature are kept relatively stable, the wall surface temperature of the metal heating surface is kept at a higher temperature level and is far away from a corrosion area of an acid dew point, and the phenomena of acid corrosion and ash blockage of the heat exchanger are fundamentally avoided.
The above embodiments are only used for explaining the present invention, and not for limiting the protection of the present invention, and any insubstantial changes made on the basis of the essential schemes of the present invention should fall within the protection scope of the present invention.
Claims (1)
1. The utility model provides a waste heat recovery system of recycling of power boiler afterbody flue gas which characterized in that: comprises a boiler tail flue (1), a composite phase-change heat exchanger (2), a demineralized water main pipe (3), a deaerator (4), a heat storage water tank (5) and a hot water pipe network system (6), the composite phase change heat exchanger (2) is arranged at the horizontal section of the boiler tail flue (1), the water inlet of the composite phase change heat exchanger (2) is connected with the pipeline of the demineralized water main pipe (3), the water outlet main pipe of the composite phase change heat exchanger (2) is connected with the pipeline of the water inlet of the deaerator (4) on the one hand and the pipeline of the water inlet of the heat storage water tank (5) on the other hand, a hot water pump (7) is arranged on a water outlet pipeline of the heat storage water tank (5), a water outlet main pipe of the hot water pump (7) is connected with a water inlet pipeline of the deaerator (4) on the one hand and is connected with a hot water pipe network system (6) on the other hand, and corresponding valves are arranged in the connecting pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020790270.8U CN212377960U (en) | 2020-05-13 | 2020-05-13 | Waste heat recovery system of recycling of power boiler afterbody flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020790270.8U CN212377960U (en) | 2020-05-13 | 2020-05-13 | Waste heat recovery system of recycling of power boiler afterbody flue gas |
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| Publication Number | Publication Date |
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| CN212377960U true CN212377960U (en) | 2021-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202020790270.8U Active CN212377960U (en) | 2020-05-13 | 2020-05-13 | Waste heat recovery system of recycling of power boiler afterbody flue gas |
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| CN (1) | CN212377960U (en) |
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2020
- 2020-05-13 CN CN202020790270.8U patent/CN212377960U/en active Active
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