CN210197705U - Waste heat recovery device of gas boiler - Google Patents

Waste heat recovery device of gas boiler Download PDF

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Publication number
CN210197705U
CN210197705U CN201921004453.6U CN201921004453U CN210197705U CN 210197705 U CN210197705 U CN 210197705U CN 201921004453 U CN201921004453 U CN 201921004453U CN 210197705 U CN210197705 U CN 210197705U
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economizer
gas
condensing
inlet
outlet
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CN201921004453.6U
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Inventor
Xiaona Wang
王小娜
Zhengfu Yang
杨正富
Feifan Gou
勾非凡
Haohao Su
苏浩浩
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Xinao Shuneng Technology Co Ltd
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Xinao Shuneng Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

The utility model discloses a gas boiler waste heat recovery device, include: the high-temperature gas inlet of the economizer is connected with the flue gas outlet of the gas-fired boiler, and the cold fluid outlet of the economizer is communicated with the liquid inlet of the gas-fired boiler; the high-temperature gas inlet of the condensing economizer is communicated with the high-temperature gas outlet of the economizer; the water storage device is connected with the cold fluid inlet of the condensing type energy saver; and a liquid inlet of the thermal deaerator is connected with a cold fluid outlet of the condensing economizer, and a liquid outlet of the thermal deaerator is connected with a cold fluid inlet of the economizer. The utility model discloses an add condensing energy-saving appliance in gas boiler afterbody flue system, can fall the exhaust gas temperature below the flue gas dew point temperature, after the gas boiler flue gas waste heat degree of depth is retrieved, both can practice thrift the cost, avoided serious environmental heat to pollute again, reach obvious energy-conservation, consumption reduction and emission reduction's purpose.

Description

Waste heat recovery device of gas boiler
Technical Field
The utility model relates to an economizer field, concretely relates to gas boiler waste heat recovery device.
Background
At present, the exhaust gas temperature of domestic common gas utilization equipment during operation is generally higher than a design value. The exhaust gas temperature of the gas boiler is above 150-250 ℃, and the average thermal efficiency of the boiler is about 80%. Because the main component of natural gas is methane and the hydrogen content is very high, the flue gas discharged after combustion contains a large amount of water vapor, and the latent heat of vaporization of the water vapor accounts for about one tenth of the high-level calorific value of the natural gas. The exhaust gas temperature rises, and the exhaust loss increases, thereby resulting in the reduction of boiler efficiency, the increase of fuel consumption, the reduction of economic benefits, and the waste of energy and environmental pollution. Obviously, if the exhaust gas temperature of the gas boiler can be reduced to be lower than the dew point temperature, and the vaporization latent heat of the condensed water can be recycled, the thermal efficiency of the boiler can be greatly improved. Therefore, the exhaust gas temperature of the gas boiler is deeply reduced, and the recovery of the waste heat of the exhaust gas has great energy-saving significance. The traditional flue gas waste heat recovery device mainly refers to an economizer and an air preheater.
The traditional flue gas waste heat recovery device mainly refers to an economizer and an air preheater. Due to the limitation of the design principle, the device is difficult to achieve the purpose of greatly reducing the temperature of the exhaust smoke. The conventional flue gas waste heat recovery device is designed to avoid the condensation phenomenon in a heat transfer surface, so the reduction range of the exhaust gas temperature is very limited, generally speaking, the optimum exhaust gas temperature reduction range of the conventional flue gas waste heat recovery device is about 55 ℃, the conventional flue gas waste heat recovery device cannot reduce the exhaust gas temperature of a gas boiler below the dew point temperature (about 60 ℃) to recover latent heat, and the energy-saving effect is not obvious.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a gas boiler waste heat recovery technique based on condensing energy-saving appliance, it can be with the exhaust gas temperature fall below the flue gas dew point temperature through add condensing energy-saving appliance in gas boiler afterbody flue system, after gas boiler flue gas waste heat degree of depth recovery, both can practice thrift the cost, avoided serious environmental heat to pollute again, reach obvious energy-conservation, consumption reduction and emission reduction's purpose.
The utility model discloses a gas boiler waste heat recovery device, include:
the high-temperature gas inlet of the economizer is connected with the flue gas outlet of the gas-fired boiler, and the cold fluid outlet of the economizer is communicated with the liquid inlet of the gas-fired boiler;
the high-temperature gas inlet of the condensing economizer is communicated with the high-temperature gas outlet of the economizer;
the water storage device is connected with the cold fluid inlet of the condensing economizer;
and a liquid inlet of the thermal deaerator is connected with a cold fluid outlet of the condensing economizer, and a liquid outlet of the thermal deaerator is connected with a cold fluid inlet of the economizer.
As a preferred technical scheme, the waste heat recovery device of the gas boiler further comprises a branch air cylinder, and a steam outlet of the branch air cylinder is connected with a steam inlet of the thermal deaerator.
As a preferred technical scheme, a high-temperature gas inlet of the economizer is arranged at the top of the economizer, and a high-temperature gas outlet of the economizer is arranged at the bottom of the economizer.
According to a preferable technical scheme, the condensing economizer is arranged below the economizer, a high-temperature gas inlet of the condensing economizer is arranged at the top of the condensing economizer, and a condensed water outlet and a flue gas outlet are formed in the bottom of the condensing economizer.
As a preferred technical scheme, the water storage device is connected with a cold fluid inlet of the condensing type energy saver through a pipeline provided with a circulating pump.
As a preferred technical scheme, a liquid inlet of the thermal deaerator is connected with a cold fluid outlet of the condensing energy saver through a pipeline provided with a delivery pump.
As a preferred technical scheme, a liquid outlet of the thermal deaerator is connected with a cold fluid inlet of the economizer through a pipeline provided with a water feed pump.
As a preferred technical scheme, the condensing energy saver adopts a reinforced fin heat exchange tube inside, a cold fluid channel is arranged inside the reinforced fin heat exchange tube, and a flue gas channel is arranged outside the reinforced fin heat exchange tube.
As a preferred technical scheme, the condensing economizer and a flue gas channel between the gas boiler and the economizer are made of stainless steel materials.
The utility model discloses a gas boiler waste heat recovery device is through addding condensing energy-saving appliance in gas boiler afterbody flue system, and the increase receives the hot side, can fall the exhaust gas temperature below flue gas dew point temperature, not only can recycle the sensible heat of discharging fume, and the water vapor that produces when can also utilizing the natural gas burning emits a large amount of latent heats when condensing, and the water of condensation simultaneously has certain absorption to the oxycarbide in the flue gas, harmful substance such as nitrogen oxide and oxysulfide. After the flue gas waste heat of the gas-fired boiler is deeply recovered, the cost can be saved, the serious environmental thermal pollution is avoided, and the obvious purposes of energy conservation, consumption reduction and emission reduction are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a waste heat recovery device of a gas boiler according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments and the corresponding drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the utility model provides a gas boiler waste heat recovery device, include:
the high-temperature gas inlet of the economizer 2 is connected with the flue gas outlet of the gas boiler 1 through a stainless steel flue gas channel, and the cold fluid outlet of the economizer is communicated with the liquid inlet of the gas boiler 1; a high-temperature gas inlet of the economizer 2 is arranged at the top of the economizer 2, and a high-temperature gas outlet is arranged at the bottom of the economizer 2;
the high-temperature gas inlet of the condensing economizer 3 is communicated with the high-temperature gas outlet of the economizer 2; the condensing economizer 3 is arranged below the economizer 2, a high-temperature gas inlet of the condensing economizer 3 is arranged at the top of the condensing economizer 3, and a condensate water outlet and a flue gas outlet are arranged at the bottom of the condensing economizer 3. The condensing energy saver is made of stainless steel materials, a reinforced fin heat exchange tube is adopted in the condensing energy saver, a cold fluid channel is arranged in the reinforced fin heat exchange tube, and a smoke channel is arranged outside the reinforced fin heat exchange tube.
The water storage device 4 is connected with a cold fluid inlet of the condensing type energy saver through a pipeline provided with a circulating pump 7;
a liquid inlet of the thermal deaerator 5 is connected with a cold fluid outlet of the condensing economizer 3 through a pipeline provided with a delivery pump 8, and a liquid outlet of the thermal deaerator is connected with a cold fluid inlet of the economizer 2 through a pipeline provided with a water feed pump 9;
and a steam outlet of the branch cylinder 6 is connected with a steam inlet of the thermal deaerator 5.
The utility model discloses a gas boiler waste heat recovery device adopts the oxygen-removed water supply mode, and gas boiler 1's rated operating mode is average exhaust gas temperature 150 ℃ down. When carrying out flue gas waste heat degree of depth recycle, retrieve flue gas waste heat heating water tank feedwater through condensing economizer 3, heat normal atmospheric temperature water (22 ℃) in water storage device 4 (cistern) to about 70 ℃, can reduce heating power oxygen-eliminating device 5 consumption steam by a wide margin. The condensing energy saver 3 adopts a reinforced fin heat exchange tube structure (an H-shaped scale tube heat exchanger), and scale tubes are sequentially arranged to reduce the increase of the smoke resistance of the system. The condensing energy saver 3 and the flue are made of stainless steel materials, and the temperature of the flue gas is reduced from 150 ℃ to 60 ℃ after the flue gas passes through the condensing energy saver 3. After the condensing energy saver 3 is additionally arranged on the tail flue of the gas boiler 1, the smoke resistance is increased, when the gas boiler operates at rated load, the smoke resistance of a smoke system is increased by about 50Pa, the smoke resistance increase value of the system is within the allowance range of a fan, and the fan equipment of the original smoke system does not need to be replaced.
The gas boiler 1 recovers flue gas condensation heat system, the heat supply return water with lower temperature passes through a condensation type energy saver 3 arranged at the tail of the boiler to cool flue gas, so as to obtain partial sensible heat and latent heat of water vapor of the flue gas, namely, the condensation type energy saver 3 is arranged in a flue at the tail of the boiler, boiler feed water passes through the condensation type energy saver 3 and then enters an economizer 2, the boiler exhaust gas is used for heating feed water of the boiler, so that the feed water is increased from the original normal temperature to 55-82 ℃ and then enters the boiler, and partial heat energy is recovered, so as to realize fuel quantity saving, the exhaust gas temperature of the gas boiler is reduced to reflect the amount of recovered sensible heat, the vapor content in the flue gas and the amount of condensed water of the flue gas reflect the amount of recovered latent heat, therefore, for the flue gas in the saturated state with the same components, the flue gas temperature is reduced differently, the flue gas temperature is reduced to be the same, the temperature reduction range of the temperature of the flue gas is different, the recovered heat can be different, the flow modes of the flue gas and the flue gas can be different between the flue gas and the water can be different, the heat efficiency can be improved by adopting a countercurrent flow mode which can increase the heat transfer temperature of the condensation fin tube, the heat of the condensation type energy-saving heat-absorbing heat-exchanging heat-absorbing heat-exchanger is suitable for the heat-absorbing.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment is mainly described as different from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (9)

1. A gas boiler waste heat recovery device, characterized by comprising:
the high-temperature gas inlet of the economizer is connected with the flue gas outlet of the gas-fired boiler, and the cold fluid outlet of the economizer is communicated with the liquid inlet of the gas-fired boiler;
the high-temperature gas inlet of the condensing economizer is communicated with the high-temperature gas outlet of the economizer;
the water storage device is connected with the cold fluid inlet of the condensing economizer;
and a liquid inlet of the thermal deaerator is connected with a cold fluid outlet of the condensing economizer, and a liquid outlet of the thermal deaerator is connected with a cold fluid inlet of the economizer.
2. The gas boiler waste heat recovery device of claim 1, further comprising a branch cylinder, wherein a steam outlet of the branch cylinder is connected with a steam inlet of the thermal deaerator.
3. The gas boiler waste heat recovery device of claim 1, wherein the high-temperature gas inlet of the economizer is arranged at the top of the economizer, and the high-temperature gas outlet is arranged at the bottom of the economizer.
4. The gas boiler waste heat recovery device of claim 3, wherein the condensing economizer is arranged below the economizer, a high-temperature gas inlet of the condensing economizer is arranged at the top of the condensing economizer, and a condensed water outlet and a flue gas outlet are arranged at the bottom of the condensing economizer.
5. The gas boiler waste heat recovery device of claim 1, wherein the water storage device is connected to the cold fluid inlet of the condensing economizer through a pipeline provided with a circulating pump.
6. The gas boiler waste heat recovery device of claim 1, wherein a liquid inlet of the thermal deaerator is connected with a cold fluid outlet of the condensing economizer through a pipeline provided with a delivery pump.
7. The gas boiler waste heat recovery device of claim 1, wherein a liquid outlet of the thermal deaerator is connected with a cold fluid inlet of the economizer through a pipeline provided with a feed water pump.
8. The gas boiler waste heat recovery device of claim 1, wherein the condensing economizer is internally provided with an enhanced fin heat exchange tube, a cold fluid channel is arranged inside the enhanced fin heat exchange tube, and a flue gas channel is arranged outside the enhanced fin heat exchange tube.
9. The gas boiler waste heat recovery device of claim 1, wherein the condensing economizer and the flue gas channel between the gas boiler and the economizer are both made of stainless steel.
CN201921004453.6U 2019-06-28 2019-06-28 Waste heat recovery device of gas boiler Active CN210197705U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921004453.6U CN210197705U (en) 2019-06-28 2019-06-28 Waste heat recovery device of gas boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921004453.6U CN210197705U (en) 2019-06-28 2019-06-28 Waste heat recovery device of gas boiler

Publications (1)

Publication Number Publication Date
CN210197705U true CN210197705U (en) 2020-03-27

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Application Number Title Priority Date Filing Date
CN201921004453.6U Active CN210197705U (en) 2019-06-28 2019-06-28 Waste heat recovery device of gas boiler

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111623332A (en) * 2020-06-05 2020-09-04 广州市东海鹏染整织造有限公司 Steam production process of gas steam boiler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111623332A (en) * 2020-06-05 2020-09-04 广州市东海鹏染整织造有限公司 Steam production process of gas steam boiler

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