CN212537805U - Boiler waste heat recovery system - Google Patents
Boiler waste heat recovery system Download PDFInfo
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- CN212537805U CN212537805U CN202022109725.8U CN202022109725U CN212537805U CN 212537805 U CN212537805 U CN 212537805U CN 202022109725 U CN202022109725 U CN 202022109725U CN 212537805 U CN212537805 U CN 212537805U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model provides a boiler waste heat recovery system, include: the water tank is communicated with the boiler and used for recovering steam condensate water generated above the boiler; the heat exchanger is communicated with the water tank; the heat utilization system is communicated with the heat exchanger in a reverse direction relative to the heat flow direction between the water tank and the heat exchanger; the first economizer is arranged in a flue of the boiler, the inflow end of the first economizer is communicated with the water tank, and the outflow end of the first economizer is communicated with the boiler. The utility model discloses a set up furnace gate exhaust pipe assembly and interior exhaust pipe assembly and first forced draught blower in, solved among the correlation technique technical problem that waste heat recovery rate is not high among the traditional boiler system.
Description
Technical Field
The invention relates to the technical field of boiler water supply, in particular to a boiler waste heat recovery system.
Background
When industrial fuel oil, gas and coal fired boilers are designed and manufactured, in order to prevent corrosion and ash blockage of the heating surface at the tail part of the boiler, the standard state exhaust gas temperature is generally not lower than 180 ℃ and can reach 250 ℃, and high-temperature exhaust gas emission not only causes a large amount of heat energy waste, but also pollutes the environment. Meanwhile, steam condensate with higher temperature can be generated in the use process of the boiler, and a large amount of waste heat of the fire coal can be taken away. The heat in the flue gas tail gas is recovered to heat the boiler for replenishing water and recover steam condensate water for other heat utilization systems, so that the energy utilization efficiency can be greatly improved; thereby saving fuel cost, reducing production cost and reducing exhaust emission.
In the related art, the tail gas waste heat recovery is generally to arrange a heat exchanger on a flue, and a water source to be injected into a boiler passes through the heat exchanger on the flue, so that the waste heat of the tail gas is utilized to preheat the water source, and then the preheated water source is injected into the boiler to be heated to a required temperature. However, when the boiler does not need to be filled with water, the waste heat of the tail gas cannot be effectively recovered. Meanwhile, the research on the recovery of waste heat in steam condensate water generated by a boiler is not available.
Therefore, a boiler waste heat recovery system capable of simultaneously recovering waste heat of steam condensate water and waste heat of tail gas generated by a boiler is imperative.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a boiler waste heat recovery system, which aims to solve the technical problem that the waste heat recovery rate in the traditional boiler system in the related art is not high.
The invention provides a boiler waste heat recovery system, comprising:
the water tank is communicated with the boiler and used for recovering steam condensate water generated above the boiler;
the heat exchanger is communicated with the water tank;
the heat utilization system is communicated with the heat exchanger in a reverse direction relative to the heat flow direction between the water tank and the heat exchanger;
the first economizer is arranged in a flue of the boiler, the inflow end of the first economizer is communicated with the water tank, and the outflow end of the first economizer is communicated with the boiler.
Optionally, the boiler waste heat recovery system further comprises:
the inflow end of the steam condensate pipe is communicated with the boiler, and the outflow end of the steam condensate pipe is communicated with the water tank;
the inflow end of the first heat exchange pipeline is communicated with the water tank, and the outflow end of the first heat exchange pipeline is communicated with the inflow end of the heat exchanger; the first heat exchange pipeline is also provided with a first pump;
the inflow end of the second heat exchange pipeline is communicated with the outflow end of the heat exchanger, and the outflow end of the second heat exchange pipeline is communicated with the water tank;
the inlet end of the first heat pipeline is communicated with the heat utilization system, and the outlet end of the first heat pipeline is communicated with the outlet end of the heat exchanger;
and the inflow end of the second heat exchange pipeline is communicated with the inflow end of the heat exchanger, and the outflow end of the second heat exchange pipeline is communicated with the heat utilization system.
Optionally, the ratio of the flow rate of the first heat exchange pipe to the flow rate of the first heat exchange pipe is 1.2-4.2: 0.8 to 2.8.
Optionally, the boiler waste heat recovery system further comprises:
the inflow end of the first flue waste heat recovery pipeline is communicated with the water tank, and the outflow end of the first flue waste heat recovery pipeline is communicated with the inflow end of the first economizer; the first flue waste heat recovery pipeline is also provided with a second pump;
and the inflow end of the boiler water replenishing pipeline is communicated with the outflow end of the first economizer, and the outflow end of the boiler water replenishing pipeline is communicated with the water replenishing end of the boiler.
Optionally, the boiler waste heat recovery system further comprises:
the second coal economizer is arranged in a flue of the boiler at intervals of the first coal economizer;
the inflow end of the second flue waste heat recovery pipeline is communicated with the water tank, and the outflow end of the second flue waste heat recovery pipeline is communicated with the inflow end of the second economizer; a third pump is also arranged on the second flue waste heat recovery pipeline;
and the inflow end of the return pipeline is communicated with the outflow end of the second economizer, and the outflow end of the return pipeline is communicated with the water tank.
Optionally, the heat exchanger is a tubular heat exchanger.
Optionally, the heat utilization system is an air conditioning heat system.
Compared with the prior art, the invention has the following beneficial effects:
in the technology of the invention, the recovery system of the boiler waste heat is optimally designed, so that the waste heat generated in the process of using the boiler is recycled in two aspects of the waste heat taken away by the fuel gas steam of the boiler and the waste heat taken away by the tail gas of the boiler, thereby reducing the waste of fuel and reducing the heat pollution of the ambient air. Specifically, a heat exchanger is arranged, the heat exchanger is communicated with a steam condensate water collecting water tank and is connected with a general heat system, and waste heat in the steam condensate water is replaced for a heat utilization system. The boiler is provided with the first economizer, the two ends of the first economizer are respectively communicated with the water tank and the boiler, and the first economizer is arranged at a flue for discharging tail gas so as to replace waste heat in the tail gas into boiler feed water and reduce heat transfer to boiler water. Therefore, the maximum recycling of the waste heat generated by the boiler is realized, and the method is environment-friendly.
Drawings
Fig. 1 is a schematic process flow diagram of a boiler waste heat recovery system according to an embodiment of the present invention.
The reference numbers illustrate:
| 100 | |
20 | First heat exchange pipeline |
| 200 | |
30 | Second heat exchange pipeline |
| 300 | |
40 | First heat pipe |
| 400 | |
50 | Second heat pipeline |
| 500 | |
60 | First flue waste |
| 600 | |
70 | Boiler water supply pipeline |
| 700 | |
80 | Second flue waste |
| 800 | |
90 | |
| 10 | Steam condensate pipe |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and beneficial effects of the present invention more clearly apparent, the technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a boiler waste heat recovery system, including:
a water tank 100 which is communicated with the boiler 500 and recovers steam condensate water generated above the boiler 500;
the heat exchanger 200 is communicated with the water tank 100;
a heat utilization system 300 in reverse communication with the heat exchanger 200 with respect to a flow direction of heat between the water tank 100 and the heat exchanger 200;
the first economizer 400 is disposed in a flue 800 of the boiler 500, an inflow end of the first economizer 400 is communicated with the water tank 100, and an outflow end of the first economizer 400 is communicated with the boiler 500.
In this embodiment, the water tank 100 is provided to recover the waste heat generated by the boiler 500. The arrangement of the water tank 100 facilitates the collection of the waste heat generated by the boiler 500; on the other hand, the waste heat is convenient to recycle. For example, but not limited to, the boiler 500 may be supplied with water through the water tank 100 to increase the temperature of the make-up water of the boiler 500, thereby reducing the heating heat transfer to the boiler water, and thus achieving energy saving. In order to facilitate that the waste heat generated by the steam pipeline of the boiler 500 can be directly used by the heat system 300, a heat exchanger 200 is provided. The flow direction of the water in the communication between the heat exchanger 200 and the water tank 100 is opposite to that of the water in the communication between the heat exchanger 200 and the heat using system 300, so as to realize heat exchange, namely, the waste heat in the steam condensate water in the water tank 100 is replaced to the heat using system 300. In order to facilitate recycling of waste heat in the exhaust gas of the boiler 500, a first economizer 400 is provided. The first economizer 400 is communicated with the water tank 100 and the boiler 500, so that waste heat in the tail gas of the boiler 500 at the position is replaced when water in the water tank 100 flows through the first economizer 400, and the heated water is used for supplying water for the boiler 500 to the boiler 500, thereby reducing the heating of other fuel to the boiler water and further reducing the thermal pollution to the surrounding environment of the boiler 500. Meanwhile, the whole recycling system does not produce redundant pollution and is environment-friendly.
Optionally, the heat exchanger 200 is provided in plurality. A plurality of the heat exchangers 200 may be arranged in parallel, directly associating each heat consumer system 300 with the water tank 100, each of the heat exchangers 200 being controlled individually or partially simultaneously.
It should be understood that a plurality of the heat exchangers 200 may also be connected in series to the heat utilization system 300.
For example, but not limiting of, the heat exchanger 200 is a tube heat exchanger. It should be understood that in other embodiments, the heat exchanger 200 may also be a plate heat exchanger, a disc heat exchanger, or the like.
Optionally, the boiler waste heat recovery system further comprises:
a steam condensate pipe 10, wherein the inflow end of the steam condensate pipe 10 is communicated with a boiler 500, and the outflow end of the steam condensate pipe 10 is communicated with the water tank 100;
a first heat exchange pipe 20, wherein an inflow end of the first heat exchange pipe 20 is communicated with the water tank 100, and an outflow end of the first heat exchange pipe 20 is communicated with an inflow end of the heat exchanger 200; a first pump 600 is arranged on the first heat exchange pipeline 20;
a second heat exchange pipe 30, an inflow end of the second heat exchange pipe 30 is communicated with an outflow end of the heat exchanger 200, and an outflow end of the second heat exchange pipe 30 is communicated with the water tank 100;
a first heat pipe 40, wherein the inflow end of the first heat pipe 40 is communicated with the heat utilization system 300, and the outflow end of the first heat pipe 40 is communicated with the outflow end of the heat exchanger 200;
and the inflow end of the second heat pipe 50 is communicated with the inflow end of the heat exchanger 200, and the outflow end of the second heat exchange pipe 30 is communicated with the heat utilization system 300.
In this embodiment, the gas steam generated during the operation of the boiler 500 flows back to the water tank 100 through the steam condensate pipe 10. For example, but not limited to, the gas steam condenser pipe is a high temperature resistant pipe. In order to prolong the service life of the pipeline, the first heat exchange pipeline 20 and/or the second heat exchange pipeline 50 are/is a pipeline made of high-temperature resistant materials. For cost savings, the second heat exchange conduit 30 and/or the first heat exchange conduit 40 are conventional conduits.
The principle of the whole boiler 500 for recycling the waste heat of the fuel gas steam is as follows: (high temperature) water evaporated by the boiler 500, flowing into the water tank 100 from the gas steam condensation pipe, flows through the first heat exchange pipe 20, and flows into the heat exchanger 200; meanwhile, the heat-exchanged material flowing out of the heat-consuming system 300 flows into the heat exchanger 200 through the first heat pipe 40, and performs heat exchange with (high-temperature) water in the heat exchanger 200, thereby carrying away part of the heat of the water, and returns to the heat-consuming system 300 through the second heat pipe 50 to supply heat to the heat-consuming system 300; at this time, the heat-exchanged water flows out of the outflow end of the heat exchanger 200 and flows into the water tank 100 through the second heat exchange pipe 30.
Optionally, the ratio of the flow rate of the first heat exchange pipe 20 to the flow rate of the first heat exchange pipe 40 is 1.2-4.2: 0.8 to 2.8.
In this embodiment, the flow rates of the first heat exchange pipe 20 and the first heat exchange pipe 40 are controlled by fully considering the heat exchange efficiency and the heat exchange cost. It should be understood that the flow rate herein refers to the volume of flow rate per unit time through the heat exchanger 200. For example, but not limiting of, the ratio of the flow rate of the first heat exchange conduit 20 to the flow rate of the first heat exchange conduit 40 is 1.2: 0.8.
Optionally, the boiler waste heat recovery system further comprises:
a first flue waste heat recovery pipeline 60, wherein an inflow end of the first flue waste heat recovery pipeline 60 is communicated with the water tank 100, and an outflow end of the first flue waste heat recovery pipeline 60 is communicated with an inflow end of the first economizer 400; a second pump (not shown in the figure) is also arranged on the first flue waste heat recovery pipeline 60;
and a boiler water replenishing pipe 70, wherein the inflow end of the boiler water replenishing pipe 70 is communicated with the outflow end of the first economizer 400, and the outflow end of the boiler water replenishing pipe 70 is communicated with the water replenishing end of the boiler 500.
In this embodiment, the waste heat of the tail gas of the boiler 500 is mainly recycled by supplying boiler water. Specifically, water flowing out of the water tank 100 flows through the first flue waste heat recovery pipeline 60 and flows into the first economizer 400, at this time, tail gas (with a temperature as high as 180-250 ℃) flowing out of a flue 800 of the boiler 500 enters the first economizer 400 through the flue 800, and heat replacement is performed under the condition of thermal entropy, so that the temperature of the tail gas flowing out of the first economizer 400 is greatly reduced, and the temperature of water flowing out of the first economizer 400 is greatly increased; finally, the heated water is supplied to the boiler 500 through the boiler water supply pipeline 70, so that the additional heating of the boiler water is reduced; meanwhile, the heat of the tail gas discharged to the atmosphere is reduced, and the environmental pollution is reduced.
Optionally, the boiler waste heat recovery system further comprises:
a second economizer 700 installed in the flue 800 of the boiler 500 at an interval of the first economizer 400;
an inflow end of the second flue waste heat recovery pipeline 80 is communicated with the water tank 100, and an outflow end of the second flue waste heat recovery pipeline 80 is communicated with an inflow end of the second economizer 700; a third pump (not shown in the figure) is also arranged on the second flue waste heat recovery pipeline 80;
and the inflow end of the return pipe 90 is communicated with the outflow end of the second economizer 700, and the outflow end of the return pipe 90 is communicated with the water tank 100.
In this embodiment, the waste heat of the boiler 500 tail gas can be utilized by recycling the waste heat to the water tank 100 and then providing heat to the heat utilization system 300 by other methods. Specifically, when the make-up water does not need to be added to the boiler 500, the collection of the waste heat in the tail gas is realized through the second economizer 700. The water flowing out of the water tank 100 flows into the second economizer 700 through the second flue waste heat recovery pipe 80, and at this time, the exhaust gas discharged from the flue 800 of the boiler 500 flows into the second economizer 700 from the flue 800, and heat exchange is realized between the exhaust gas and the water in the second economizer 700, so that the temperature of the water flowing out of the second economizer 700 is increased, and the temperature of the exhaust gas flowing out of the second economizer 700 is greatly reduced; the heated water flows back to the water tank 100 through the return pipeline 90, so that the collection of the waste heat of the tail gas is realized; the cooled tail gas is discharged to the atmosphere through the flue 800, so that the thermal pollution to the environment is reduced.
Optionally, in order to reduce the use of the pump body and save material cost, a flue waste heat recovery main pipe and a tee joint are further arranged. The inflow end of the main flue waste heat recovery pipeline is communicated with the water tank 100, and the outflow end of the main flue waste heat recovery pipeline is communicated with the three-way pipeline. At this time, the inflow end of the first flue waste heat recovery pipeline 60 is communicated with the tee joint, and the outflow end of the first flue waste heat recovery pipeline 60 is communicated with the water tank 100; the inflow end of the second flue waste heat recovery pipeline 80 is communicated with the tee joint, and the outflow end of the second flue waste heat recovery pipeline 80 is communicated with the water replenishing end of the boiler 500. The pump body is arranged on the flue waste heat recovery main pipeline.
Optionally, the heat utilization system 300 is an air conditioning heat system.
In this embodiment, it should be understood that the temperature of the steam condensate in the boiler 500 is generally above 90 ℃, and after the steam condensate exchanges heat with the air conditioner, the temperature of the water in the second heat exchange pipeline 30 is reduced to about 80 ℃; and the temperature of the liquid in the second heat pipeline 50 in the air conditioning system is raised to about 40-60 ℃ so as to meet the requirement of heat for air conditioning and avoid the heat generation of additional electric energy. For example, but not limited to, the air conditioning system is a laboratory air conditioning system, and the range of using the waste heat of the boiler 500 is extended, so that the use of the waste heat of the boiler 500 is not limited to the supply of water to the boiler 500. It should be understood that heat is required when the air conditioner is in either the heating or dehumidifying mode.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A boiler waste heat recovery system, comprising:
the water tank is communicated with the boiler and used for recovering steam condensate water generated above the boiler;
the heat exchanger is communicated with the water tank;
the heat utilization system is communicated with the heat exchanger in a reverse direction relative to the heat flow direction between the water tank and the heat exchanger;
the first economizer is arranged in a flue of the boiler, the inflow end of the first economizer is communicated with the water tank, and the outflow end of the first economizer is communicated with the boiler.
2. The boiler waste heat recovery system of claim 1, further comprising:
the inflow end of the steam condensate pipe is communicated with the boiler, and the outflow end of the steam condensate pipe is communicated with the water tank;
the inflow end of the first heat exchange pipeline is communicated with the water tank, and the outflow end of the first heat exchange pipeline is communicated with the inflow end of the heat exchanger; the first heat exchange pipeline is also provided with a first pump;
the inflow end of the second heat exchange pipeline is communicated with the outflow end of the heat exchanger, and the outflow end of the second heat exchange pipeline is communicated with the water tank;
the inlet end of the first heat pipeline is communicated with the heat utilization system, and the outlet end of the first heat pipeline is communicated with the outlet end of the heat exchanger;
and the inflow end of the second heat exchange pipeline is communicated with the inflow end of the heat exchanger, and the outflow end of the second heat exchange pipeline is communicated with the heat utilization system.
3. The boiler waste heat recovery system according to claim 2, wherein the ratio of the flow rate of the first heat exchange pipe to the flow rate of the first heat utilization pipe is 1.2-4.2: 0.8 to 2.8.
4. The boiler waste heat recovery system of claim 1, further comprising:
the inflow end of the first flue waste heat recovery pipeline is communicated with the water tank, and the outflow end of the first flue waste heat recovery pipeline is communicated with the inflow end of the first economizer; the first flue waste heat recovery pipeline is also provided with a second pump;
and the inflow end of the boiler water replenishing pipeline is communicated with the outflow end of the first economizer, and the outflow end of the boiler water replenishing pipeline is communicated with the water replenishing end of the boiler.
5. The boiler waste heat recovery system according to any one of claims 1 to 4, further comprising:
the second coal economizer is arranged in a flue of the boiler at intervals of the first coal economizer;
the inflow end of the second flue waste heat recovery pipeline is communicated with the water tank, and the outflow end of the second flue waste heat recovery pipeline is communicated with the inflow end of the second economizer; a third pump is also arranged on the second flue waste heat recovery pipeline;
and the inflow end of the return pipeline is communicated with the outflow end of the second economizer, and the outflow end of the return pipeline is communicated with the water tank.
6. The boiler waste heat recovery system of any one of claims 1 to 4, wherein the heat exchanger is a tube heat exchanger.
7. The boiler waste heat recovery system as recited in any one of claims 1 to 4, wherein the heat using system is a heat for air conditioning.
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| CN202022109725.8U CN212537805U (en) | 2020-09-23 | 2020-09-23 | Boiler waste heat recovery system |
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| CN202022109725.8U CN212537805U (en) | 2020-09-23 | 2020-09-23 | Boiler waste heat recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964034A (en) * | 2020-09-23 | 2020-11-20 | 华兰生物工程重庆有限公司 | Boiler waste heat recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964034A (en) * | 2020-09-23 | 2020-11-20 | 华兰生物工程重庆有限公司 | Boiler waste heat recovery system |
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