CN211503218U - Heating system - Google Patents
Heating system Download PDFInfo
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- CN211503218U CN211503218U CN201922193774.1U CN201922193774U CN211503218U CN 211503218 U CN211503218 U CN 211503218U CN 201922193774 U CN201922193774 U CN 201922193774U CN 211503218 U CN211503218 U CN 211503218U
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Abstract
The utility model relates to a heating system, heating system includes: a combustion device; the main heat exchange device is arranged on one side of the combustion device and can exchange heat with the combustion device; the liquid return pipe is connected with the liquid inlet end of the main heat exchange device; the liquid outlet pipe is connected to the liquid outlet end of the main heat exchange device; and the liquid return pipe and the liquid outlet pipe selectively exchange heat through the heat exchange structure. Above-mentioned heating system, liquid in the main heat exchange tube carries out the heat exchange through heat transfer structure with the liquid of drain pipe, can reduce the play liquid temperature of drain pipe when keeping the liquid in the main heat transfer device in higher temperature to satisfying predetermined temperature requirement, and making the flue gas keep higher temperature in order to avoid the flue gas to condense on main heat transfer device.
Description
Technical Field
The utility model relates to a heating equipment field especially relates to a heating system.
Background
The gas heating water heater as a heating device for providing hot water and heating heat by natural gas is more and more accepted by the users, and becomes an important component of heating in cold regions. When the gas heating water heater is in heating operation, when a user needs to quickly raise the room temperature, the water outlet temperature and the system circulation flow of the gas heating water heater need to be increased, and at the moment, the gas heating water heater is in a large load state. When the room temperature reaches the required value, the water outlet temperature and the circulation flow of the gas heating water heater need to be reduced, and the gas heating water heater is in a small load state.
However, the utility model discloses the people discovers in studying, the non-condensation gas heating water heater on the existing market has the phenomenon that minimum load and maximum load have the disparity more than 8% in the aspect of the thermal efficiency, the thermal efficiency when heating water heater is in maximum load is about 93%, the thermal efficiency when being in the light load is about 85%, thereby the waste of the energy has been leaded to, and the lower root cause of thermal efficiency of the heating water heater under the light load state leads to, be when gas heating water heater is in the light load state, a large amount of heats have been taken away to the exhaust flue gas. In the heating operation process, the gas heating water heater is in a small load state most of the time, so that the heat efficiency in the small load state is improved, and the energy waste can be effectively reduced.
At present, the heat efficiency of a gas heating water heater is generally increased by adopting the following two schemes, wherein one scheme is to increase the heat exchange capacity of a main heat exchanger and reduce the temperature of smoke generated by combustion so as to reduce heat loss, and the other scheme is to reduce the excess air coefficient and reduce the smoke volume.
However, according to the first embodiment, the temperature of the flue gas is lowered, and the combustion power of the burner is low and the amount and temperature of the flue gas are low in a state where the heating water heater is under a low load and a low water temperature, because the temperature of the flue gas easily reaches the dew point temperature (the dew point temperature of the flue gas is the temperature at which the water vapor in the high-temperature flue gas starts to condense). By adopting the second scheme, the excess air is reduced, the dew point temperature of the smoke is increased, and the smoke temperature can easily reach the dew point temperature when the heating water heater is under a small load. After the combustion, partial smoke is condensed on the main heat exchanger, so that the main heat exchanger is corroded, and the service life of the heating water heater is finally shortened.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a heating system with high heat exchange efficiency under a small load state and a control method thereof, aiming at the problem that the heating water heater has low heat exchange efficiency under the small load state.
A heating system, comprising:
a combustion device;
the main heat exchange device is arranged on one side of the combustion device and can exchange heat with the combustion device;
the liquid return pipe is connected to the liquid inlet end of the main heat exchange device;
the liquid outlet pipe is connected to the liquid outlet end of the main heat exchange device; and
the liquid return pipe and the liquid outlet pipe selectively exchange heat through the heat exchange structure.
Above-mentioned heating system, liquid in the main heat exchange tube carries out the heat exchange through heat transfer structure with the liquid of drain pipe, can reduce the play liquid temperature of drain pipe when keeping the liquid in the main heat transfer device in higher temperature to satisfying predetermined temperature requirement, and making the flue gas keep higher temperature in order to avoid the flue gas to condense on main heat transfer device.
In one embodiment, the liquid return pipe comprises a first liquid return branch pipe and a second liquid return branch pipe which are connected in parallel, and the second liquid return branch pipe can exchange heat with the liquid outlet pipe through the heat exchange structure.
In one embodiment, a part of the liquid outlet pipe and a part of the second liquid return branch pipe are respectively located in the heat exchange structure.
In one embodiment, the liquid return pipe further comprises a first liquid return main pipe, the first liquid return branch pipe and the second liquid return branch pipe are connected in parallel with the outlet end of the first liquid return main pipe, and the first liquid return main pipe is selectively communicated with the first liquid return branch pipe and/or the second liquid return branch pipe.
In one embodiment, the heating system further comprises a flow control unit, the first main return pipe, the first branch return pipe and the second branch return pipe are connected through the flow control unit, and the flow control unit is used for controlling the first main return pipe to be communicated with the first branch return pipe and/or the second branch return pipe.
In one embodiment, the flow control unit is an electric three-way valve.
In one embodiment, the electric three-way valve comprises a first valve port, a second valve port and a third valve port which can be opened and closed, the first valve port is connected to the outlet end of the first main return pipe, the second valve port is connected to the inlet end of the first branch return pipe, and the third valve port is connected to the inlet end of the second branch return pipe.
In one embodiment, the liquid return pipe further comprises a second liquid return main pipe, and the first liquid return branch pipe and one end of the second liquid return branch pipe, which is far away from the first liquid return main pipe, are connected in parallel with the second liquid return main pipe.
In one embodiment, the heat exchange structure is a plate heat exchanger.
In one embodiment, the heating system is a gas-fired heating furnace system.
Drawings
Fig. 1 is a schematic view of a heating system according to an embodiment of the present invention;
FIG. 2 is a liquid path diagram of the heating system of FIG. 1 in a low temperature, low load condition;
fig. 3 is a liquid path diagram of the heating system shown in fig. 1 in a non-low temperature and small load state.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a heating system 100 according to an embodiment of the present invention is used for heating each room indoors. The structure of the medium heating system 100 according to the present application will be described below by taking the heating system 100 as a gas heating furnace system as an example. The present embodiment is described as an example, and the technical scope of the present application is not limited thereto. It is understood that in other embodiments, the heating system 100 may also be embodied as a gas water heater system, etc., and is not limited thereto.
Specifically, the heating system 100 includes a control device (not shown), a combustion device 10, a main heat exchange device 20, a liquid outlet pipe 40, a heating pipe, and a liquid return pipe 30. The main heat exchange device 20 is disposed at one side of the combustion device 10, and the main heat exchange device 20 can exchange heat with the combustion device 10 to obtain heat of high-temperature flue gas generated by combustion of the combustion device 10.
Thus, under the control of the control device, the natural gas is combusted in the combustion device 10, the high-temperature flue gas generated by combustion can exchange heat with the liquid in the main heat exchange device 20, the liquid after heat exchange flows out of the main heat exchange device 20 through the liquid outlet pipe 40, flows into each room through the heating pipe to exchange heat with the air in the room so as to heat each room, and finally the liquid after heat exchange returns to the main heat exchange device 20 through the liquid return pipe 30.
With continued reference to fig. 1, the liquid return pipe 30 includes a first liquid return main pipe 32, a second liquid return main pipe 34, a first liquid return branch pipe 36, and a second liquid return branch pipe 38. The first liquid return branch pipe 36 and the second liquid return branch pipe 38 are connected in parallel between the first liquid return main pipe 32 and the second liquid return main pipe 34, the inlet end of the first liquid return main pipe 32 is connected to the outlet end of the heating pipe, the outlet end of the first liquid return main pipe 32 is connected to the inlet ends of the first liquid return branch pipe 36 and the second liquid return branch pipe 38, the outlet ends of the first liquid return branch pipe 36 and the second liquid return branch pipe 38 are connected to the inlet end of the second liquid return main pipe 34, and the outlet end of the second liquid return main pipe 34 is connected to the liquid inlet end of the main heat exchange device 20. The inlet end of the liquid outlet pipe 40 is connected to the liquid outlet end of the main heat exchange device 20, and the outlet end of the liquid outlet pipe 40 is connected to the inlet end of the heating pipe.
Therefore, the liquid absorbing the heat of the flue gas in the main heat exchange device 20 enters the heating pipe through the liquid outlet pipe 40, and after the heat exchange of the liquid in the heating pipe is completed in the room, the liquid passes through the first liquid return main pipe 32, the first liquid return branch pipe 36 and/or the second liquid return branch pipe 38, and the second liquid return main pipe 34 in sequence and returns to the main heat exchange device 20 again.
Further, the heating system 100 further includes a flow control unit 60 communicatively connected to the control device. The first main return pipe 32, the first branch return pipe 36 and the second branch return pipe 38 are connected by a flow control unit 60, and the flow control unit 60 is used for controlling the first main return pipe 32 to communicate with the first branch return pipe 36 and/or the second branch return pipe 38, so that the liquid in the first main return pipe 32 can selectively flow into the second main return pipe 34 through the first branch return pipe and/or the second branch return pipe 38.
Specifically, the flow control unit 60 is an electric three-way valve including a first valve port, a second valve port, and a third valve port that can be opened or closed under the control of the control device. The first valve port is connected to the outlet end of the first main return pipe 32, the second valve port is connected to the inlet end of the first branch return pipe 36, and the third valve port is connected to the inlet end of the second branch return pipe 38. In this way, the control device can control the opening of the valve port of the flow control unit 60 to change the flow path of the liquid.
Further, the heating system 100 further includes a heat exchanging structure 50, and the second liquid return branch 38 can exchange heat with the liquid outlet pipe 40 through the heat exchanging structure 50.
Specifically, since the liquid in the main heat exchanger 20 absorbs the heat of the flue gas in the main heat exchanger 20 to increase the temperature after entering the main heat exchanger 20, the temperature of the liquid flowing from the main heat exchanger 20 into the liquid outlet pipe 40 is higher than that of the liquid in the liquid return pipe 30. When the heating system 100 is in a low-temperature and low-load state, the outlet temperature of the outlet end of the liquid outlet pipe 40 is required to be relatively low, so that the heat exchange structure 50 can be used for exchanging heat between the liquid in the liquid return pipe and the liquid in the liquid outlet pipe 40, and the heat of the liquid in the liquid outlet pipe 40 is transferred to the liquid return pipe 30 to be cooled to reach the preset outlet temperature, so that the temperature of the liquid in the main heat exchange device 20 does not need to be directly reduced. Because the temperature of the flue gas is positively correlated with the temperature of the liquid in the main heat exchange device 20, the liquid in the main heat exchange device 20 is maintained at a higher temperature, so that the flue gas can be kept at a higher temperature, and the heat exchange rate of the heating system in a low-temperature and small-load state can be improved by reducing the discharge amount of the flue gas, and meanwhile, the flue gas is prevented from being condensed on the main heat exchange device 20, so that the service life of the main heat exchange device 20 is shortened. On the contrary, if the liquid outlet temperature of the main liquid outlet pipe 40 is reduced by reducing the temperature of the liquid in the main heat exchange device 20, the temperature of the flue gas exchanging heat with the liquid in the main heat exchange device 20 will be lower, and if the discharge amount of the flue gas is reduced to try to improve the heat exchange rate of the heating system 100, the temperature of the flue gas is extremely lower than the dew point temperature and is condensed, so that the main heat exchange device 20 is corroded, and the service life of the main heat exchange device 20 is affected.
A control method of the heating system 100 includes the following steps:
s110: the load state of the heating system 100 is acquired.
Specifically, the heating system 100 has two load states, a low-temperature small load state and a non-low-temperature small load state, and the non-low-temperature small load state includes any other load state such as a large load state other than the low-temperature small load state. Specifically, in some embodiments, when the heating system 100 is in a low-temperature and low-load state, the outlet temperature of the outlet pipe 40 is 20 ℃ to 45 ℃, and the load of the heating system 100 is less than 30% of the full load.
S120: whether the liquid in the liquid return pipe 30 exchanges heat with the liquid in the liquid outlet pipe 40 through the heat exchange structure 50 is controlled according to the load state of the heating system 100.
Specifically, the control device controls the working state of the flow rate adjusting unit according to the load state of the heating system 100, and further controls the flow path of the liquid in the liquid return pipe 30, and finally controls the liquid outlet temperature of the liquid outlet pipe 40.
When the heating system 100 is in a low-temperature and low-load state, the control device controls the first valve and the third valve of the flow regulating unit to be in an open state, and the second valve is in a closed state, so that the first liquid return main pipe 32 is communicated with the second liquid return main pipe 34 only through the second liquid return branch pipe 38, and the liquid in the second liquid return branch pipe 38 exchanges heat with the liquid in the liquid outlet pipe 40 through the heat exchange structure 50. Since the temperature of the liquid in the second branch return liquid pipe 38 is lower than that of the liquid in the liquid outlet pipe 40, the heat of the liquid in the liquid outlet pipe 40 is transferred to the second branch return liquid pipe 38, so that the temperature of the liquid flowing out of the outlet end of the liquid outlet pipe 40 is lower than that in the main heat exchange device 20 to meet the preset liquid outlet temperature requirement. Thus, the temperature of the liquid in the main heat exchange device 20 is higher, resulting in higher temperature of the flue gas exchanging heat with the main heat exchange device, so that when the flue gas discharge amount is reduced to increase the heat efficiency of the heating system 100, the temperature of the flue gas is not easy to be lower than the dew point temperature, and therefore, the flue gas cannot be condensed on the main heat exchange device 20.
When the heating system 100 is in a non-low-temperature and low-load state, the first valve and the second valve, which are controlled by the control device to regulate the flow, are in an open state, the third valve is in a closed state, and the first main liquid return pipe 32 is communicated with the second main liquid return pipe 34 only through the second branch liquid return pipe 38. In this way, the liquid in the liquid return pipe 30 does not pass through the heat exchange structure 50, and the liquid in the liquid outlet pipe 40 does not exchange heat in the heat exchange structure 50, so the liquid outlet temperature of the liquid outlet pipe 40 is the same as the liquid temperature in the main heat exchange device 20. On the contrary, if the liquid in the liquid outlet pipe 40 still exchanges heat with the liquid in the second liquid return branch pipe 38 when the heating system 100 is in a non-low temperature and small load state, the temperature of the liquid in the main heat exchange device 20 will be higher and easy to vaporize in case that the liquid outlet temperature of the liquid outlet pipe 40 reaches the preset higher liquid outlet temperature. In some embodiments, the third valve may also be in a partially open state.
According to the heating system 100 and the control method thereof, as the liquid outlet pipe 40 and the liquid return pipe 30 can exchange heat through the heat exchange structure 50, the difference between the liquid outlet temperature of the liquid outlet pipe 40 and the liquid temperature in the main heat exchange device 20 can be adjusted by using the liquid in the liquid return pipe 30 according to different load states, so that the heating system 100 can reduce the smoke discharge amount, improve the heat exchange efficiency in a small load state by 12% -14%, and improve the heat exchange efficiency in a large load state by 3% -5%, ensure that the smoke has higher temperature, avoid smoke condensation caused by reduction of the smoke discharge amount, achieve the purposes of energy conservation and emission reduction, and prolong the service life of the heating system 100. In addition, because the problem of condensation of the heating system 100 in a low-load low-water-temperature state is solved, the adjusting range of the combustion power of the combustion device 10 can be expanded, the starting times of the heating system 100 are reduced, the applicability of the heating system 100 is expanded, different requirements of users on heating are met, and the user experience is greatly improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A heating system, characterized in that the heating system comprises:
a combustion device (10);
the main heat exchange device (20) is arranged on one side of the combustion device (10), and the main heat exchange device (20) can exchange heat with the combustion device (10);
the liquid return pipe (30) is connected to the liquid inlet end of the main heat exchange device (20);
the liquid outlet pipe (40) is connected to the liquid outlet end of the main heat exchange device (20); and
the liquid return pipe (30) and the liquid outlet pipe (40) selectively exchange heat through the heat exchange structure (50).
2. Heating system according to claim 1, wherein the return pipe (30) comprises a first return branch (36) and a second return branch (38) connected in parallel, the second return branch (38) being adapted to exchange heat with the outlet pipe (40) via the heat exchange structure (50).
3. Heating system according to claim 2, wherein part of the liquid outlet pipe (40) and part of the second liquid return branch pipe (38) are respectively located in the heat exchange structure (50).
4. The heating system according to claim 2, wherein the liquid return pipe (30) further comprises a first liquid return main pipe (32), the first liquid return branch pipe (36) and the second liquid return branch pipe (38) are connected in parallel with an outlet end of the first liquid return main pipe (32), and the first liquid return main pipe (32) is selectively communicated with the first liquid return branch pipe (36) and/or the second liquid return branch pipe (38).
5. The heating system according to claim 4, further comprising a flow control unit (60), wherein the first main return pipe (32), the first branch return pipe (36) and the second branch return pipe (38) are connected by the flow control unit (60), and wherein the flow control unit (60) is configured to control the first main return pipe (32) to communicate with the first branch return pipe (36) and/or the second branch return pipe (38).
6. Heating system according to claim 5, wherein the flow control unit (60) is an electric three-way valve.
7. The heating system according to claim 6, wherein the electric three-way valve includes a first valve port, a second valve port and a third valve port which are openable and closable, the first valve port being connected to an outlet end of the first main return pipe (32), the second valve port being connected to an inlet end of the first branch return pipe (36), and the third valve port being connected to an inlet end of the second branch return pipe (38).
8. The heating system according to claim 4, wherein the liquid return pipe (30) further comprises a second liquid return main pipe (34), and the first liquid return branch pipe (36) and an end of the second liquid return branch pipe (38) away from the first liquid return main pipe (32) are connected in parallel to the second liquid return main pipe (34).
9. Heating system according to claim 1, wherein the heat exchanging structure (50) is a plate heat exchanger.
10. The heating system according to any one of claims 1 to 9, wherein the heating system is a gas-fired heating stove system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922193774.1U CN211503218U (en) | 2019-12-09 | 2019-12-09 | Heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922193774.1U CN211503218U (en) | 2019-12-09 | 2019-12-09 | Heating system |
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| CN211503218U true CN211503218U (en) | 2020-09-15 |
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| CN201922193774.1U Active CN211503218U (en) | 2019-12-09 | 2019-12-09 | Heating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110793186A (en) * | 2019-12-09 | 2020-02-14 | 珠海格力电器股份有限公司 | Heating system and control method thereof |
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2019
- 2019-12-09 CN CN201922193774.1U patent/CN211503218U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110793186A (en) * | 2019-12-09 | 2020-02-14 | 珠海格力电器股份有限公司 | Heating system and control method thereof |
| CN110793186B (en) * | 2019-12-09 | 2023-11-28 | 珠海格力电器股份有限公司 | Heating system and control method thereof |
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