CN111059563A - Flue gas waste heat degree of depth recovery economizer system based on gas boiler - Google Patents
Flue gas waste heat degree of depth recovery economizer system based on gas boiler Download PDFInfo
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- CN111059563A CN111059563A CN202010061347.2A CN202010061347A CN111059563A CN 111059563 A CN111059563 A CN 111059563A CN 202010061347 A CN202010061347 A CN 202010061347A CN 111059563 A CN111059563 A CN 111059563A
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- gas
- water exchanger
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- boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention belongs to the technical field of municipal heating, and particularly relates to a flue gas waste heat deep recovery energy-saving system based on a gas boiler. The system comprises a gas-water exchanger, wherein the gas-water exchanger is respectively connected with a heat pump unit, a second gas-water exchanger, a gas boiler and a condensate water recycling system, and the second gas-water exchanger is also respectively connected with the heat pump unit and the gas boiler. The invention has the beneficial effects that: the gas-water exchanger adopts the corrosion-resistant high-efficiency gas-water exchanger, so that the whole equipment is corrosion-resistant, high in heat exchange efficiency, small in size and small in occupied area; the heat-conducting medium circularly releases and takes heat, so that the exhaust gas temperature of the gas-fired boiler is reduced, gas is effectively saved, and the efficiency of the gas-fired boiler can be ensured to reach more than 100%; the invention is provided with a condensate water recycling system which is connected with the fifth device, can effectively recycle and utilize condensate water in the flue gas, and is energy-saving and environment-friendly.
Description
Technical Field
The invention belongs to the technical field of municipal heating, and particularly relates to a flue gas waste heat deep recovery energy-saving system based on a gas boiler.
Background
Municipal heating is also called urban centralized heating, and a heat supply medium is conveyed and distributed to heat users by an urban centralized heat supply heat source, so that the urban centralized heating is called urban centralized heating. The municipal heating is simple in that a large heating company provides a system for collectively heating each unit or living district, so that the occupied area is reduced, the air pollution is reduced, and the energy is saved. Compared with municipal heating, the system also comprises a small collective boiler and a household earth heater. The small boiler is a small heating device which is arranged in a unit or one or more living districts and generally has a small coverage area. The domestic local heating is characterized in that a small heating device is arranged for the domestic use by a family as a unit, so that people in cold regions can obtain a good living environment.
In the prior art, most municipal heating adopts fossil energy to heat water through a boiler of a heat source plant, and then the heated water is conveyed to each household through a heating pipeline. The exhaust gas temperature of international standard gas-fired boilers is not lower than 110 ℃, the exhaust gas temperature of the currently operated gas-fired boilers is mostly 120-180 ℃, the boiler efficiency is generally about 90%, the heat energy in the exhaust gas cannot be effectively utilized, and the steam in the exhaust gas is discharged into the atmosphere and is combined with the dust in the air to easily form haze, thereby causing air pollution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a flue gas waste heat deep recovery energy-saving system based on a gas boiler, which not only effectively reduces the exhaust gas temperature of the gas boiler, absorbs and utilizes latent heat of vaporization in flue gas, improves the thermal efficiency of the boiler and reduces the waste of thermal energy, but also greatly reduces the water vapor in the flue gas discharged into the atmosphere because the water vapor in the flue gas is greatly condensed and separated out, thereby reducing the pollution of the atmosphere.
The technical scheme for solving the technical problems is as follows: a flue gas waste heat deep recovery energy-saving system based on a gas-fired boiler comprises a gas-water exchanger, wherein the input end of the gas-water exchanger is connected with a second gas-water exchanger and the gas-fired boiler, the output end of the gas-water exchanger is respectively connected with the second gas-water exchanger and a condensate water recovery and reuse system, the output end of the second gas-water exchanger is connected with the gas-fired boiler, a heat pump unit is arranged on a branch of the gas-water exchanger and the second gas-water exchanger, and the gas-water exchanger, the second gas-water exchanger and the gas-fired;
the second air-water exchanger is used for preheating air entering the second air-water exchanger, the gas-fired boiler is used for heating the air entering the second air-water exchanger, the air-water exchanger uses the air water entering the second air-water exchanger as a medium to perform heat exchange treatment, the heat pump unit is used for conveying a heat-conducting medium to the second air-water exchanger and absorbing heat of substances entering the second air-water exchanger, and the condensed water recycling system is used for recycling condensed water entering the second air-water exchanger.
Further, the heat pump unit comprises a condenser and an evaporator, the gas-water exchanger comprises a first gas-water exchanger and a third gas-water exchanger, the first gas-water exchanger and the gas-fired boiler form a loop, and the third gas-water exchanger, the evaporator and the second gas-water exchanger form a loop.
Further, an air blower is arranged between the second air-water exchanger and the gas boiler, and a heat pump input circulating pump is arranged between the second air-water exchanger and the evaporator.
Furthermore, the input end of the first gas-water exchanger is provided with a boiler circulating pump, and the boiler circulating pump is used for conveying a part of low-temperature water of the pipe network before entering the gas-fired boiler to the first gas-water exchanger.
Furthermore, the input end of the condenser is provided with a heat pump output circulating pump for conveying the other part of pipe network low-temperature water before entering the gas boiler to the condenser.
The invention has the beneficial effects that:
1. the gas-water exchanger adopts the corrosion-resistant high-efficiency gas-water exchanger, so that the whole equipment has small volume, small occupied area, corrosion resistance and high heat exchange efficiency;
2. the heat-conducting medium is used for circularly releasing and taking heat, so that the exhaust gas temperature of the gas-fired boiler is low, the gas is effectively saved, and the efficiency of the gas-fired boiler can be ensured to reach more than 100%;
3. the invention is provided with the condensate water recycling system connected with the third gas-water exchanger, can effectively recycle and utilize the condensate water in the flue gas, and is energy-saving and environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a deep flue gas waste heat recovery energy-saving system based on a gas boiler according to an embodiment of the present invention;
FIG. 2 is a block diagram of a process route of a deep flue gas waste heat recovery energy-saving system based on a gas boiler according to an embodiment of the present invention;
reference numerals:
1-a first gas-water exchanger; 2-a gas boiler; 3-a heat pump unit; 4-a second gas-water exchanger; 5-a third gas-water exchanger; 6-condensate water recycling system.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In the description of the present application, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Examples
As shown in fig. 1, the deep flue gas waste heat recovery energy-saving system based on a gas-fired boiler provided by the invention comprises a gas-water exchanger, wherein the input end of the gas-water exchanger is connected with a second gas-water exchanger 4 and the gas-fired boiler 2, the output end of the gas-water exchanger is respectively connected with the second gas-water exchanger 4 and a condensate water recovery and reuse system 6, the output end of the second gas-water exchanger 4 is connected with the gas-fired boiler 2, a heat pump unit 3 is arranged on a branch of the gas-water exchanger and the second gas-water exchanger 4, and the gas-water exchanger, the second gas-water exchanger 4 and the gas;
wherein, second air water exchanger 4 is used for preheating the air that gets into it, gas boiler 2 is used for heating the air that gets into it, air water exchanger uses the air water that gets into it to carry out heat transfer treatment as the medium, heat pump set 3 be used for to second air water exchanger carries heat-conducting medium, and is used for absorbing the heat of the material that gets into it, condensate water recycling system 6 is used for retrieving the processing of recycling of the condensate water that gets into it.
Further, as shown in the process route diagram of fig. 2, the heat pump unit includes a condenser and an evaporator, the gas-water exchanger includes a first gas-water exchanger 1 and a third gas-water exchanger 5, the first gas-water exchanger 1 and the gas-fired boiler 2 form a loop, and the third gas-water exchanger 5, the evaporator and the second gas-water exchanger 4 form a loop.
Further, as shown in the process route block diagram of fig. 2, an air blower is disposed between the second air-water exchanger 4 and the gas-fired boiler 2, the preheated cold air is automatically sent to the gas-fired boiler 2 by using the pressure difference of the air blower, and a heat pump input circulating pump is disposed between the second air-water exchanger 4 and the evaporator, and is used for sending the heat-conducting medium output by the evaporator to the second air-water exchanger 4.
Further, as shown in the process route block diagram of fig. 2, a boiler circulating pump is disposed at an input end of the first gas-water exchanger 1, and is configured to deliver a part of low-temperature water in a pipe network before entering the gas-fired boiler 2 to the first gas-water exchanger 1.
Further, as shown in the process route diagram of fig. 2, a heat pump output circulation pump is disposed at an input end of the condenser, and is used for delivering the other part of low-temperature water in the pipe network before entering the gas boiler 2 to the condenser.
The gas-water exchanger can adopt a corrosion-resistant high-efficiency gas-water exchanger, and the second gas-water exchanger 4 can adopt a high-efficiency gas-water exchanger.
The working principle of the invention is specifically as follows: a part of low-temperature water in a pipe network before entering the gas boiler flows reversely to enter a gas-water exchanger, is fully contacted with the flue gas through a first gas-water exchanger 1, fully cools the flue gas, simultaneously separates out water vapor in the flue gas, absorbs heat in the flue gas and then enters a gas boiler 2 for continuous heating; the heat-conducting medium output by the evaporator enters the second gas-water exchanger 4 through the heat pump input circulating pump to heat cold air about to enter the gas boiler 2, the heat-conducting medium enters the third gas-water exchanger after being continuously cooled, the flue gas output from the first gas-water exchanger 1 is cooled again, heat is absorbed from the flue gas, the final exhaust gas temperature is reduced, the heat-conducting medium absorbing the heat from the third gas-water exchanger 5 enters the evaporator to release heat, and the evaporator absorbs the heat, so that the heat-conducting medium forms a heat-releasing and heat-taking loop through the evaporator, the second gas-water exchanger 4 and the third gas-water exchanger 5 to be recycled; the preheated cold air becomes preheated air, enters the gas boiler 2 through the blower, and meanwhile, natural gas is input into the gas boiler 2 and is used for heating air and water entering the gas boiler 2, so that the boiler can provide hot water and steam; the other part of the low-temperature water in the pipe network before entering the gas boiler 2 enters a condenser of the heat pump unit 3 through a heat pump output circulating pump, fully absorbs the heat from the evaporator through the condenser, then becomes hot water, and is combined with the outlet water of the gas boiler 2 for output; the condensed water discharged from the third air-water exchanger 5 is recycled by the condensed water recycling system 6.
The invention utilizes the heat absorbed by the heat-conducting medium from the flue gas, one part of the heat-conducting medium enters the boiler to be continuously heated, the other part of the heat-conducting medium is used for heating the cold air entering the gas boiler, and the residual heat is organically combined with the heat pump unit to be jointly used, thereby achieving the purpose of recovering and utilizing the heat energy in the flue gas.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a flue gas waste heat degree of depth retrieves economizer system based on gas boiler which characterized in that: the system comprises a gas-water exchanger, wherein the input end of the gas-water exchanger is connected with a second gas-water exchanger (4) and a gas-fired boiler (2), the output end of the gas-water exchanger is respectively connected with the second gas-water exchanger (4) and a condensate water recycling system (6), the output end of the second gas-water exchanger (4) is connected with the gas-fired boiler (2), a heat pump unit (3) is arranged on a branch path of the gas-water exchanger and the second gas-water exchanger (4), and the gas-water exchanger, the second gas-water exchanger (4) and the gas-fired boiler (2);
wherein, second air water exchanger (4) are used for preheating the air that gets into it, gas boiler (2) are used for heating the air that gets into it, air water exchanger uses the air water that gets into it to carry out heat transfer treatment as the medium, heat pump set (3) be used for to second air water exchanger (4) carry heat-conducting medium, and be used for absorbing the heat of the material that gets into it, condensate water recycling system (6) are used for retrieving the treatment of recycling with the condensate water that gets into it in.
2. The deep flue gas waste heat recovery energy-saving system based on the gas-fired boiler as claimed in claim 1, characterized in that: the heat pump unit (3) comprises a condenser and an evaporator, the air-water exchanger comprises a first air-water exchanger (1) and a third air-water exchanger (5), the first air-water exchanger (1) and the gas-fired boiler (2) form a loop, and the third air-water exchanger (5) forms a loop with the evaporator and the second air-water exchanger (4).
3. The deep flue gas waste heat recovery energy-saving system based on the gas-fired boiler as claimed in claim 2, characterized in that: an air blower is arranged between the second air-water exchanger (4) and the gas boiler (2), and a heat pump input circulating pump is arranged between the second air-water exchanger (4) and the evaporator.
4. The deep flue gas waste heat recovery energy-saving system based on the gas-fired boiler as claimed in any one of claims 2 or 3, wherein: the input end of the first gas-water exchanger (1) is provided with a boiler circulating pump which is used for conveying a part of pipe network low-temperature water before entering the gas-fired boiler (2) to the first gas-water exchanger (1).
5. The deep flue gas waste heat recovery energy-saving system based on the gas-fired boiler as claimed in any one of claims 2 or 3, wherein: the input end of the condenser is provided with a heat pump output circulating pump which is used for conveying the other part of pipe network low-temperature water before entering the gas boiler (2) to the condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010061347.2A CN111059563A (en) | 2020-01-19 | 2020-01-19 | Flue gas waste heat degree of depth recovery economizer system based on gas boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010061347.2A CN111059563A (en) | 2020-01-19 | 2020-01-19 | Flue gas waste heat degree of depth recovery economizer system based on gas boiler |
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| CN111059563A true CN111059563A (en) | 2020-04-24 |
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| CN202010061347.2A Pending CN111059563A (en) | 2020-01-19 | 2020-01-19 | Flue gas waste heat degree of depth recovery economizer system based on gas boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278956A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
| CN114278959A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
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| CN108826418A (en) * | 2018-07-30 | 2018-11-16 | 清华大学 | A kind of residual heat from boiler fume recovery system and working method based on gas-burning machine heat pump |
| CN109386837A (en) * | 2017-08-09 | 2019-02-26 | 新疆工程学院 | A kind of flue gas waste heat recovery system of solar wind-energy combination drive mechanical compression type heat pump cycle |
| CN209744404U (en) * | 2019-04-10 | 2019-12-06 | 青岛新奥清洁能源有限公司 | Heating system for deep utilization of flue gas waste heat of natural gas boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278956A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
| CN114278959A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
| CN114278956B (en) * | 2021-12-28 | 2024-07-19 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
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