CN213019820U - Absorption heat exchanger unit and large temperature difference heat supply system thereof - Google Patents
Absorption heat exchanger unit and large temperature difference heat supply system thereof Download PDFInfo
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- CN213019820U CN213019820U CN202022153450.8U CN202022153450U CN213019820U CN 213019820 U CN213019820 U CN 213019820U CN 202022153450 U CN202022153450 U CN 202022153450U CN 213019820 U CN213019820 U CN 213019820U
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Abstract
The utility model discloses an absorption heat exchanger unit and heating system thereof, wherein absorption heat exchanger unit includes: an absorption heat exchanger; the secondary net water regulating pump is arranged on the heat absorption side of the absorption type heat exchanger; and the load regulator is arranged at the heat release side of the absorption heat exchanger. The device can realize the purpose of reducing the return water temperature of the primary net water under the condition that the heat supply temperature and the flow of the secondary net water are not changed, the waste heat recovery effect of a heat supply system is improved, and the system operation cost is reduced.
Description
Technical Field
The utility model relates to a heat supply technical field, in particular to absorption heat exchanger group and big difference in temperature heating system thereof.
Background
The system for supplying heat by adopting the absorption heat exchanger unit with large temperature difference is widely applied in recent years. In a conventional plate heat exchanger, the return water temperature of primary net water is higher than that of secondary water (for example, 100/50 ℃ for primary water and 45/55 ℃ for secondary water), and after an absorption heat exchanger unit is adopted, the return water temperature of the primary water can be reduced to be lower than that of the secondary water (for example, 100/30 ℃ for primary water and 45/55 ℃ for secondary water) under the condition that the temperature of the secondary water is not changed due to the adoption of an absorption refrigeration principle, so that large-temperature-difference heat supply of the primary water is realized.
However, in actual operation, many thermal power stations control the flow of the secondary grid water by changing the frequency of the secondary grid water supply, so as to reduce the mechanical consumption of the heat exchanger (or adjust in stages, such as low flow in the initial and final cold periods and high flow in the severe cold period); or by reducing the number of heat exchangers operating to improve heat economy.
Although the two modes reduce the heat supply cost to a certain extent, the waste heat recovery effect of the system is not considered, the flow of the secondary network water is reduced or the number of running heat exchangers is reduced, the return water temperature of the primary network water is increased, and the waste heat recovery proportion of the primary network water is reduced. Many heating power stations do not give full play to the effect of the big difference in temperature heat supply of absorption heat exchanger group, also do not fully consider the waste heat recovery effect of power plant's head station, have caused that overall system's comprehensive effect does not reach the best.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an aim at provides an absorption heat exchanger unit and big difference in temperature heating system thereof to under the condition that satisfies secondary net water heat supply parameter, reduce the return water temperature of net water once, thereby increase thermal power plant's waste heat recovery effect, make whole heating system's economic nature reinforcing.
In order to solve the above technical problem, an embodiment of the utility model provides an aspect provides an absorption heat exchanger unit, include: an absorption heat exchanger; the secondary net water regulating pump is arranged on the heat absorption side of the absorption type heat exchanger; and the load regulator is arranged at the heat release side of the absorption heat exchanger.
Further, the absorption heat exchanger unit still includes: and the water supplementing constant-pressure device is arranged at the upstream of the secondary net water regulating pump and is used for automatically supplementing water and keeping constant pressure based on the pressure of the water inlet end of the secondary net water regulating pump.
Further, the load regulator comprises an electric valve which is used for regulating the flow of the primary net water circulating at the heat release side of the absorption heat exchanger.
Further, the load regulator comprises a variable frequency pump, and the variable frequency pump is used for regulating the frequency of the primary net water circulating on the heat release side of the absorption heat exchanger.
Further, the load regulator comprises an electric valve and a variable frequency pump and is used for regulating the flow and the frequency of the primary net water circulating at the heat release side of the absorption heat exchanger.
Further, the absorption heat exchanger unit still includes: a flow sensor; and flow sensors are arranged on the heat absorption side of the absorption heat exchanger and the heat release side of the absorption heat exchanger.
Further, the absorption heat exchanger unit still includes: and the regulation and control system is electrically connected with the flow sensor, the secondary network water regulating pump and the load regulator and is used for controlling the flow of the secondary network water regulating pump and the load regulator based on the flow sensor.
Further, the absorption heat exchanger unit still includes: and the load sensor is electrically connected with the absorption heat exchanger and is used for detecting the actual output power of the absorption heat exchanger.
Further, the absorption heat exchanger unit still includes: and the temperature sensor is arranged on a primary net water return pipeline on the heat release side of the absorption heat exchanger.
The utility model discloses another aspect provides a big difference in temperature heating system, include: any one of the above absorption heat exchanger units.
The embodiment of the utility model provides an above-mentioned technical scheme has following profitable technological effect:
the device can realize the purpose of reducing the return water temperature of the primary net water under the condition that the heat supply temperature and the flow of the secondary net water are not changed, the waste heat recovery effect of a heat supply system is improved, and the system operation cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an absorption heat exchanger unit provided by an embodiment of the present invention.
Reference numerals:
1-an absorption heat exchanger; 2-a secondary net water regulating pump; 3-a load regulator; 4-water supplementing and pressure stabilizing device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The various regions, shapes, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as the actual requirements dictate.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
The design of absorption heat exchanger group and big difference in temperature system, "design return water temperature requirement" is the design of going on under the most unfavorable operating mode, and in the better first and last cold period of heat supply operating mode, the reason should have lower return water temperature, and better waste heat recovery effect can be realized at the head to lower return water temperature, and heat supply economic nature further improves.
The existing control strategy reduces the number of running stations, actually improves the return water temperature, reduces the waste heat recovery effect of the first station, and is poorer in overall economy.
In addition, when the working conditions of the initial and final cold periods are good, the purpose of reducing the pump consumption can be achieved by reducing the secondary water amount, but the reduction of the secondary water amount causes the rise of the average temperature of the secondary water, which is a disadvantageous working condition for the absorption heat exchanger unit, and indirectly improves the return water temperature of the primary water, so that the waste heat recovery ratio is reduced.
The above described method, while also reducing some of the pump losses, is not affordable compared to the waste heat loss. In addition, the return water temperature of the primary network water is increased, so that the primary network water amount is increased under the same external heat supply amount, and the delivery pump consumption of the primary network water pipeline is also increased more.
Referring to fig. 1, an embodiment of the present invention provides an absorption heat exchanger unit, including: an absorption heat exchanger 1; the secondary net water regulating pump 2 is arranged on the heat absorption side of the absorption type heat exchanger 1; and a load adjuster 3 provided on the heat radiation side of the absorption heat exchanger 1.
In a specific embodiment, the water flow and flow rate and flow frequency of the secondary network water regulating pump 2 are determined according to the heat supply parameter requirements of heat users in different periods.
Specifically, the different periods include a severe cold period, an initial and final cold period, and the like.
Specifically, the heating parameter requirements of the heat consumer include the temperature, flow rate, frequency and the like of the secondary network water.
Specifically, after the heat supply parameters of the heat user are obtained, the flow and the frequency of the secondary network water regulating pump 2 are calculated according to the heat supply parameters, and the secondary network water regulating pump 2 is used for controlling the frequency and the flow of the secondary network water pipeline to be invariable, so that the flow and the frequency of the heat pumping side of the absorption heat pump are invariable.
In some embodiments, the absorption heat exchanger train further comprises: and the water supplementing constant pressure device 4 is arranged at the upstream of the secondary net water regulating pump 2, and the water supplementing constant pressure device 4 carries out automatic water supplementing constant pressure based on the pressure of the water inlet end of the secondary net water regulating pump 2. Specifically, moisturizing level pressure equipment 4 locates the side of intaking of secondary net water regulating pump 2, avoids the change of the secondary net water flow that the too big or undersize of pressure leads to before the pump of secondary net water regulating pump 2.
In some embodiments, the load regulator 3 comprises an electrically operated valve for regulating the flow rate of the primary net water flowing through the heat-release side of the absorption heat exchanger 1, and the electrically operated valve is installed when a pressure reduction operation is required to reduce the influence of pressure on the flow rate of the primary net water.
In some embodiments, the load regulator 3 comprises an inverter pump for regulating the frequency of the primary grid water flowing through the heat-release side of the absorption heat exchanger 1, which is installed when a boost operation is required, also reducing the effect of pressure on the primary grid water flow.
In a preferred embodiment, the load regulator 3 comprises an electric valve and a variable frequency pump for regulating the flow rate and frequency of the primary net water flowing through the heat-release side of the absorption heat exchanger 1, and the electric valve and the variable frequency pump are installed at the same time for enhancing the control of the flow rate of the primary net water.
In some embodiments, the absorption heat exchanger train further comprises: a flow sensor; and flow sensors are arranged on the heat absorption side of the absorption heat exchanger 1 and the heat release side of the absorption heat exchanger 1.
In some embodiments, the absorption heat exchanger train further comprises: and the regulation and control system is electrically connected with the flow sensor, the secondary network water regulating pump 2 and the load regulator 3, and is used for controlling the flow of the secondary network water regulating pump 2 and the load regulator 3 based on the flow sensor.
Specifically, based on the flow of the secondary network water detected by the flow sensor on the heat release side of the absorption heat exchanger 1, the regulation and control system sets the working parameters of the secondary network water regulating pump 2, so that the return water flow of the secondary network water meets the requirements of a heat user, and the flow of the secondary network water is not greatly changed.
In some embodiments, the absorption heat exchanger train further comprises: and the load sensor is electrically connected with the absorption heat exchanger 1 and is used for detecting the actual output power of the absorption heat exchanger 1.
In some embodiments, the absorption heat exchanger train further comprises: and the temperature sensor is arranged on a primary net water return pipeline at the heat release side of the absorption heat exchanger 1.
The utility model discloses a big difference in temperature heating system adjusting method as follows:
1. in the whole heating season, the flow of the secondary network backwater is fixed;
2. the absorption heat exchanger unit automatically operates from the beginning of the heating season to the end of the heating season.
3. If present, the conventional thermal station still operates as it is.
4. The operation mode of the heat exchange initial station of the power plant is as follows: the waste heat recovery unit is mainly used in low heat supply load, the heat supply amount of the steam-water heat exchanger is gradually increased according to the requirement of the outlet water temperature, and the requirement of heat supply parameters is met.
5. Because the absorption refrigeration heat exchange unit uses high-temperature primary net water as drive, the higher the water supply temperature of the primary net water is, the lower the primary net return water temperature is, and the lower the primary net return water temperature is, the better the waste heat recovery effect of the heat exchange primary station of the power plant is, and the less the pump consumption of the primary net water is.
Therefore, the temperature of the primary network backwater is the core of waste heat recovery of the heat exchange initial station of the power plant. In order to make the primary net return water temperature lower, the higher the supply water temperature of the primary net water, the better. Therefore, when only a large temperature difference unit is considered, when the load is reduced, the primary water flow is preferentially reduced, the water supply temperature is ensured, and the reduction of the flow is considered step by step. Therefore, high water supply temperature is ensured, the return water temperature of primary water is reduced, and in addition, the energy consumption of primary net water is reduced through flow reduction. In consideration of waste heat recovery of the heat exchange primary station of the power plant, the higher the outlet water temperature is, the higher the proportion of high-pressure steam heat supply of the heat exchange primary station of the power plant is, and therefore, the full utilization amount adjustment cannot be realized.
The performance of the absorption heat exchanger unit and the waste heat recovery unit of the power plant heat exchange primary station is combined, and a specific primary net water heat supply adjusting mode is as follows: after heat supply is started, the temperature of outlet water of the primary net water is kept constant at 80 ℃, the increase of load is increased, the flow is increased firstly, when the flow is increased to 60% of the maximum flow, the temperature of the water supply is increased, the flow is increased after the temperature is increased to 90 ℃, the flow is increased again, when the flow is increased to 80% of the maximum flow, the temperature of the water supply is increased to 100 ℃, the flow is gradually increased until the maximum flow is reached, and then the temperature is increased again for adjustment. The load reduction is performed in the reverse order, and thus is not described in detail.
The utility model discloses another aspect provides a big difference in temperature heating system, include: any one of the above absorption heat exchanger units.
In some embodiments, the large-temperature-difference heating system further comprises: and the waste heat recovery unit is communicated with the primary net water return pipeline.
In some embodiments, the waste heat recovery unit further comprises a waste heat input end and a waste heat output end for exchanging heat with the primary grid return water.
In some embodiments, the heat source for heating by waste heat is power plant turbine waste heat or flue gas waste heat.
In some embodiments, the absorption heat exchanger units in the large temperature difference heat supply system are multiple, and multiple absorption heat exchanger units are connected in series, or connected in parallel, or connected in series and parallel simultaneously, so as to improve the heat exchange efficiency and meet the heat supply demand of a heat user.
The embodiment of the utility model provides an aim at protecting an absorption heat exchanger unit and big difference in temperature heating system thereof, possess following effect:
the device realizes the control of the primary network water flow, thereby realizing the purpose of reducing the primary network water return water temperature under the condition of not changing the secondary network water heat supply temperature and the water supply flow, reducing the waste heat recovery effect of the heat supply system while reducing the system pump consumption, and improving the overall economic benefit of the heat supply system.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. An absorption heat exchanger unit, comprising:
an absorption heat exchanger (1);
the secondary net water adjusting pump (2) is arranged on the heat absorption side of the absorption type heat exchanger (1);
a load regulator (3) provided on the heat release side of the absorption heat exchanger (1);
and the water supplementing constant pressure device (4) is arranged at the upstream of the secondary net water regulating pump (2), and the water supplementing constant pressure device (4) carries out automatic water supplementing constant pressure based on the pressure of the water inlet end of the secondary net water regulating pump (2).
2. The absorption heat exchanger train of claim 1,
the load regulator (3) comprises an electric valve which is used for regulating the flow of primary net water flowing through the heat release side of the absorption heat exchanger (1).
3. The absorption heat exchanger train of claim 1,
the load regulator (3) comprises a variable frequency pump, and the variable frequency pump is used for regulating the frequency of primary net water flowing through the heat release side of the absorption heat exchanger (1).
4. The absorption heat exchanger train of claim 1,
the load regulator (3) comprises an electric valve and a variable frequency pump and is used for regulating the flow rate and the frequency of primary net water flowing through the heat release side of the absorption heat exchanger (1).
5. The absorption heat exchanger train of claim 1, further comprising: a flow sensor;
the flow sensors are arranged on the heat absorption side of the absorption heat exchanger (1) and the heat release side of the absorption heat exchanger (1).
6. The absorption heat exchanger train of claim 5, further comprising: and the regulation and control system is electrically connected with the flow sensor, the secondary net water regulating pump (2) and the load regulator (3), and is used for controlling the secondary net water regulating pump (2) and the load regulator (3) based on the flow of the flow sensor.
7. The absorption heat exchanger train of claim 1, further comprising:
a load sensor electrically coupled to the absorption heat exchanger (1), the load sensor being configured to detect an actual output power of the absorption heat exchanger (1).
8. The absorption heat exchanger train of claim 1, further comprising:
and the temperature sensor is arranged on a primary net water return pipeline on the heat release side of the absorption heat exchanger (1).
9. A large temperature difference heating system, comprising:
an absorption heat exchanger train as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022153450.8U CN213019820U (en) | 2020-09-27 | 2020-09-27 | Absorption heat exchanger unit and large temperature difference heat supply system thereof |
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| CN202022153450.8U CN213019820U (en) | 2020-09-27 | 2020-09-27 | Absorption heat exchanger unit and large temperature difference heat supply system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339869A (en) * | 2021-06-16 | 2021-09-03 | 西安西热节能技术有限公司 | Heat exchange station system based on utilization of redundant pressure head of primary network |
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2020
- 2020-09-27 CN CN202022153450.8U patent/CN213019820U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339869A (en) * | 2021-06-16 | 2021-09-03 | 西安西热节能技术有限公司 | Heat exchange station system based on utilization of redundant pressure head of primary network |
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