Cross-season energy storage heat supply system and working method

Abstract

The invention relates to a cross-season energy storage and heat supply system and a working method. The cross-season energy storage and heat supply system comprises a heat exchanger, an energy storage device and a heat supply device. The heat exchanger is provided with a primary side flow channel and a secondary side flow channel, an outlet of the low-grade heat source is connected with an inlet of the primary side runner through a heat source circulating pump, and an inlet is connected with an outlet of the primary side runner; a low-temperature area of the heat storage device is connected with an inlet of the secondary side runner through a heat storage circulating pump, and a high-temperature area of the heat storage device is connected with an outlet of the secondary side runner; an inlet of the heat collection device is connected with the low-temperature area of the heat storage device through a reheating circulating pump, and an outlet is connected with the high-temperature area of the heat storage device; a heat supply circulating pipeline is arranged between the high-temperature area and the low-temperature area of the heat storage device, the heat supply circulating pipeline is used for being connected with a heating terminal, the heat supply circulating pipeline is further provided with a heat supply circulating pump, and the heat supply circulating pump is arranged between the heating terminal connecting position of the heat supply circulating pipeline and the high-temperature area. And the heat supply stability is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of district heating technology, in particular to a cross-season energy storage heating system and working method. BACKGROUND

[0002] The statements herein are provided only to complement the background of the present application and are not necessarily prior art.

[0003] The heat source of the traditional district heating is mainly the thermal power plant and the district boiler house, wherein the thermal power plant mainly uses high-quality steam as the heat source for heating, which utilizes high-grade energy, and is a typical "high energy and low use", resulting in waste of energy quality, and the district boiler house generally uses coal or natural gas boilers, both of which use fossil energy, which is easy to cause air pollution, and the low-grade waste heat generated by various industrial processes has a temperature of about 60℃. Due to the influence of the production process, the heating capacity has intermittency and instability, and there is a huge mismatch in time with the winter heating, which cannot be reasonably utilized and can only be discharged, resulting in waste of heat. The renewable energy such as solar thermal system is unstable for heating in winter heating season and is seriously affected by the weather. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a cross-season energy storage heating system and working method, which can effectively utilize the low-grade energy in the industrial process, without using high-grade energy, and stabilize the heating in the winter heating season.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: In a first aspect, the embodiments of the present application provide a cross-season energy storage heating system, comprising: Heat exchanger: having a primary side flow channel and a secondary side flow channel capable of heat exchange; Low-grade heat source: the outlet thereof is connected to the inlet of the primary side flow channel through a heat source circulating pump, and the inlet thereof is connected to the outlet of the primary side flow channel; Heat storage device: the low-temperature zone thereof is connected to the inlet of the secondary side flow channel through a heat storage circulating pump, and the high-temperature zone thereof is connected to the outlet of the secondary side flow channel; Heat collecting device: the inlet thereof is connected to the low-temperature zone of the heat storage device through a reheating circulating pump, and the outlet thereof is connected to the high-temperature zone of the heat storage device; A heating circulating pipeline is arranged between the high-temperature zone and the low-temperature zone of the heat storage device, the heating circulating pipeline is used for connecting a heating terminal, and a heating circulating pump is further arranged on the heating circulating pipeline, and the heating circulating pump is arranged between the heating terminal connection position and the high-temperature zone of the heating circulating pipeline.

[0006] Optionally, the heat storage device adopts a layered heat storage reservoir or a water storage tank or a phase change material heat storage tank or a borehole buried pipe geothermal system.

[0007] Optionally, the heat collecting device adopts a solar heat collector or an air source heat pump or a boiler.

[0008] Optionally, the low-grade waste heat source adopts an industrial waste heat slurry source.

[0009] Optionally, the high-temperature area of the heat storage device is provided with a first temperature detection element, and the low-temperature area is provided with a second temperature detection element.

[0010] Optionally, the outlet of the heat collecting device is provided with a third temperature detection element.

[0011] In a second aspect, embodiments of the present application provide a working method of the cross-season energy storage heating system of the first aspect: Non-heating season heat storage: The heat source circulating pump and the heat storage circulating pump work, the heat source medium of the low-grade waste heat source enters the primary side flow channel of the heat exchanger, and the heat storage medium in the heat storage device enters the secondary side flow channel of the heat exchanger under the action of the heat storage circulating pump, exchanges heat with the low-grade waste heat source medium in the primary side flow channel and is heated, until the temperature of the heat storage medium in the high-temperature area of the heat storage device exceeds the first set temperature; The heat source circulating pump is closed, the reheating circulating pump is opened, the heat storage medium in the heat storage device is heated again through the heat collecting device until the temperature of the heat storage medium in the low-temperature area of the heat storage device reaches the second set temperature; Heating season heat release: The heat supply circulating pump works, and the heat storage medium in the heat storage device which stores heat well in the non-heating season flows through the heating terminal through the heat supply circulating pipeline to heat the heating terminal.

[0012] Optionally, the first set temperature is 57-59℃, preferably 59℃, and the second set temperature is 88-92℃, preferably 90℃.

[0013] Optionally, when the outlet temperature of the heat collecting device is greater than the sum of the temperature of the heat storage medium in the high-temperature area and the set temperature difference, the reheating circulating pump is started again; Further, the set temperature difference is 4-6℃, preferably 5℃.

[0014] Optionally, when the temperature of the heat storage medium in the low-temperature area is less than the third set temperature, the heat source circulating pump and the heat storage circulating pump are started again, and the third set temperature is less than the first set temperature.

[0015] The beneficial effects of the present application are as follows: 1.The cross-season energy storage heating system and working method of the present application are provided with a heat exchanger, the primary side flow channel of the heat exchanger is connected with a low-grade waste heat source, the secondary side flow channel is connected with a heat storage device, and the heat storage device is also connected with a heat collecting device. Through the heat exchanger, the heat storage medium in the heat storage device can be heated to a first set temperature by the medium of the low-grade waste heat source, and then the heat storage medium in the heat storage device is heated to a second set temperature by the heat collecting device, so that the heat of the heat storage medium in the heat storage device reaches the heat demand of a heating season. During the heating season, the heat storage device can be used to supply heat to the heating terminal. The heat storage device stores heat by using the heat collecting device and the low-grade waste heat source, avoiding the waste of high-grade energy and the waste of energy quality. At the same time, the heat storage device uses the heat of the low-grade waste heat source, which can effectively collect the intermittent and unstable low-grade waste heat in the industrial process, solve the huge mismatch problem between industrial heat production and winter heating in time, and avoid the waste of low-grade waste heat. At the same time, the heat storage device is used for heating during the heating season, and the heating is stable and not affected by the environment.

[0016] 2.The cross-season energy storage heating system and working method of the present application, the heat collecting device uses a solar heat collector, and solar energy is used to replace high-grade fuel for heating, which can improve the energy grade at low cost.

[0017] 3.The cross-season energy storage heating system and working method of the present application, a heat source circulating pump, a heat storage circulating pump and a heating circulating pump are arranged, the flow of each circulating loop can be independently controlled, and the heat source fluctuation and the change of the heating terminal load can be adapted. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of the present application form a part thereof and serve to provide further understanding of the present application, the exemplary embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application.

[0019] Figure 1 is a schematic diagram of the overall structure of embodiment 1 of the present application; Figure 2 is a flow chart of the working method of embodiment 2 of the present application; 1. low-grade waste heat source, 2. heat exchanger, 3. heat storage device, 4. heating terminal, 5. heat collecting device, 6. heat source circulating pump, 7. heat storage circulating pump, 8. reheating circulating pump, 9. heating circulating pump, 10. first thermal resistor, 11. second thermal resistor, 12. third thermal resistor. DETAILED DESCRIPTION Embodiment 1 The present embodiment provides a cross-season energy storage heating system, as Figure 1As shown, it comprises a heat exchanger 2, a low-grade waste heat source 1, a heat storage device 3, a heat collection device 5, a heat source circulating pump 6, a heat storage circulating pump 7, a reheating circulating pump 8, a heat supply circulating pump 9 and corresponding pipelines, etc.

[0020] The heat exchanger 2 can be an existing device, which has a primary side flow channel and a secondary side flow channel, and the flow media in the primary side flow channel and the secondary side flow channel can exchange heat.

[0021] The low-grade waste heat source 1 can provide low-grade waste heat medium, and a low-grade waste heat medium circulating pipeline is connected between the outlet and the inlet of the low-grade waste heat source 1, and the primary side flow channel of the heat exchanger 2 is connected to the low-grade waste heat medium circulating pipeline, wherein a pipe section of the low-grade waste heat medium circulating pipeline between the inlet of the primary side flow channel and the outlet of the low-grade waste heat source 1 is provided with the heat source circulating pump 6.

[0022] The heat source circulating pump 6 can drive the low-grade waste heat medium to flow out of the low-grade waste heat source 1 into the primary side flow channel of the heat exchanger 2, and after flowing out of the primary side flow channel of the heat exchanger 2, the low-grade waste heat medium reflows into the low-grade waste heat source 1.

[0023] In this embodiment, the low-grade waste heat source 1 adopts an industrial waste heat slurry source, such as a steel plant deslagging water system or a desulfurization slurry system or a paper mill wastewater system, etc., which can provide low-grade waste heat medium with a temperature of up to 60℃.

[0024] The industrial waste heat slurry source is a prior art, and its specific technical details are not described in detail here. The slurry discharge pipe of the industrial waste heat slurry source is connected to the heat source circulating pump 6 as part of the low-grade waste heat medium circulating pipeline, and the outlet of the primary side flow channel is connected to the slurry collection system of the industrial waste heat slurry source through the low-grade waste heat medium circulating pipeline.

[0025] The heat storage device 3 adopts a cross-season heat storage body, the bottom is a low-temperature zone, and the top is a high-temperature zone. The cross-season heat storage body can be an existing device, such as a layered heat storage reservoir or a water storage tank or a phase change material heat storage tank or a borehole buried pipe geothermal system, etc., which can be selected by a person skilled in the art according to the actual situation.

[0026] The cross-season heat storage body can be an existing device, and its specific structure is not described in detail here.

[0027] A first-stage temperature rising circulating pipeline is arranged between the interface of the bottom low-temperature zone and the interface of the top high-temperature zone of the heat storage device, the secondary side flow channel of the heat exchanger 2 is connected to the first-stage temperature rising circulating pipeline, and the heat storage circulating pump 7 is arranged on the first-stage temperature rising circulating pipeline between the inlet of the secondary side flow channel of the heat exchanger 2 and the interface of the low-temperature zone of the heat storage device 3, and the heat storage circulating pump 7 can drive the heat storage medium in the low-temperature zone of the heat storage device 3 to enter the secondary side flow channel of the heat exchanger 2, and the heat-exchanged heat storage medium flows out of the secondary side flow channel and enters the high-temperature zone of the heat storage device 3.

[0028] The top high-temperature zone of the heat storage device 3 is provided with a first temperature detection element for detecting the temperature of the heat storage medium in the high-temperature zone, and the bottom low-temperature zone is provided with a second temperature detection element for detecting the temperature of the heat storage medium in the low-temperature zone.

[0029] In this embodiment, the first temperature detection element is a first thermal resistor 10, and the detection temperature is T10; the second temperature detection element is a second thermal resistor 11, and the detection temperature is T11.

[0030] The first thermal resistor 10 and the second thermal resistor 11 can be obtained by using existing equipment, and the specific structure is not described in detail here.

[0031] The high-temperature zone and the low-temperature zone of the heat storage device 3 are also provided with a secondary heating circulation pipeline, and a heat collecting device 5 is arranged on the secondary heating circulation pipeline.

[0032] A reheating circulation pump 8 is installed on the secondary heating circulation pipeline between the inlet of the heat collecting device 5 and the low-temperature zone of the heat storage device 3, which can drive the heat storage medium in the heat storage device 3 to flow out from the low-temperature zone, enter the heat collecting device 5 for heating and temperature rising, and then flow into the high-temperature zone of the heat storage device 3.

[0033] In this embodiment, the heat collecting device 5 adopts an air source heat pump or a boiler or a solar heat collector, preferably a solar heat collector, which uses solar energy to heat the heat storage medium twice, replaces high-grade fossil fuels, and improves the energy grade with low cost.

[0034] A third temperature detection element is arranged on the secondary heating circulation pipeline between the outlet of the solar heat collector and the high-temperature zone of the heat storage device 3, which is used to detect the temperature of the heat storage medium at the outlet of the solar heat collector.

[0035] The third temperature detection element is a third thermal resistor 12, and the detection temperature is T12. The third thermal resistor 12 can be obtained by using existing equipment, and the specific structure is not described in detail here.

[0036] The heat storage device 3 is also connected with a heat supply circulation pipeline, one end of which is connected to the top high-temperature zone of the heat storage device 3, and the other end is connected to the bottom low-temperature zone of the heat storage device 3. The heat supply circulation pipeline is provided with an access position of a heating terminal 4, which is used to access the heating terminal. The heating terminal is a heating device for residential areas and / or factories and / or schools.

[0037] A heat supply circulation pump 9 is installed on the heat supply circulation pipeline between the access position of the heating terminal 4 and the high-temperature zone of the heat storage device 3, which can drive the heat storage medium in the high-temperature zone of the heat storage device 3 to flow into the heating terminal 4 for heating.

[0038] The first thermal resistance 10, the second thermal resistance 11 and the third thermal resistance 12 are connected with the central controller, and can transmit the collected temperature information to the central controller. The central controller is connected with the heat source circulating pump 6, the heat storage circulating pump 7 and the reheating circulating pump 8, and can control the working of the heat source circulating pump 6, the heat storage circulating pump 7 and the reheating circulating pump 8.

[0039] In the embodiment, the central controller is a PLC controller or a DCS controller, which can be set according to actual needs by those skilled in the art.

[0040] Embodiment 2 The embodiment provides a working method of the cross-season energy storage heating system as described in embodiment 1, which, as shown in the figure, comprises a heat storage process in a non-heating season and a heat release process in a heating season. Figure 2 The heat storage process in the non-heating season is as follows:

[0041] The heat storage process in the non-heating season is as follows: The first thermal resistance 10 is used to collect the temperature of the heat storage medium in the high-temperature zone of the heat storage device 3 in real time. When the temperature T10 collected by the first thermal resistance 10 is less than the third set temperature, the heat source circulating pump 6 and the heat storage circulating pump 7 are started, the low-grade waste heat source medium sent by the low-grade waste heat source 1 enters the primary side flow channel of the heat exchanger 2, and the heat storage medium in the heat storage device 3 enters the secondary side flow channel of the heat exchanger 2 under the action of the heat storage circulating pump 7, exchanges heat with the low-grade waste heat source medium in the primary side flow channel and is heated, until the temperature of the heat storage medium in the high-temperature zone of the heat storage device 3 exceeds the first set temperature.

[0042] After the temperature of the heat storage medium in the high-temperature zone exceeds the first set temperature, the heat source circulating pump 6 and the heat storage circulating pump 7 are closed. The first heating of the heat storage medium in the heat storage device 3 is completed.

[0043] In the embodiment, the first set temperature is higher than the third set temperature. The first set temperature is 57-59℃, and preferably 59℃. The third set temperature is 53-56℃, and preferably 55℃.

[0044] After the temperature of the heat storage medium in the high-temperature zone exceeds 59℃, the industrial waste heat storage capacity has reached the upper limit, and the first heating of the heat storage medium is completed. In the embodiment, after the temperature of the heat storage medium in the high-temperature zone exceeds 59℃ to a set temperature value higher than 59℃, it is considered that the industrial waste heat storage capacity has reached the upper limit. The set temperature value can be set according to actual needs, which is not described in detail here.

[0045] When the outlet temperature T12 of the solar collector collected by the third thermal resistance 12 is higher than the sum of the high-temperature zone heat storage medium temperature T10 and the set temperature difference, the reheating circulating pump 8 is started. In the embodiment, when the third thermal resistance 12 collects a temperature reaching a set temperature value exceeding T10+the set temperature difference, the reheating circulating pump 8 is started. The set temperature value can be set according to actual needs, and is not described in detail herein.

[0046] The high-temperature zone medium temperature is measured by the first thermal resistance 10, the set temperature difference is 4-6°C, and preferably 5°C. That is, when T12>T10+5°C, the reheating circulating pump 8 is started.

[0047] After the reheating circulating pump 8 is started, the reheating circulating pump 8 drives the heat storage medium in the heat storage device 3 to flow through the solar collector to be heated and warmed, and the heat storage capacity of the heat storage device 3 is continuously increased.

[0048] When the second thermal resistance 11 collects a heat storage medium temperature T11 of the low-temperature zone exceeding the second set temperature, it is indicated that the heat storage capacity of the heat storage device has reached the design value, at which time the reheating circulating pump 8 is closed, and at which time the heat storage device 3 can store the heat required for a heating season.

[0049] The second set temperature is 88-92°C, and preferably 90°C. When the second thermal resistance 11 collects a low-temperature zone heat storage medium temperature reaching a set temperature value exceeding 90°C, it is considered that the heat storage device stores the heat required for a heating season. The set temperature value can be set according to actual needs, and is not described in detail herein.

[0050] Through the above two stages of heating and warming of the heat storage medium, the heat storage device 3 can store the heat required for a heating season.

[0051] During the heating season, the heat source circulating pump 6 and the heat storage circulating pump 7 are closed, and the heat supply circulating pump 9 is opened. The heat supply circulating pump 9 drives the heat storage medium storing heat in the heat storage device 3 to flow into the heating terminal 4 to supply heat to the heating terminal 4.

[0052] During the heat supply process, the heat supply demand signal is collected in real time, the heating terminal heat supply load feedback is obtained, the frequency of the heat supply circulating pump 9 is adjusted in real time according to the heat supply load of the heating terminal 4, when the heat supply load demand of the heating terminal 4 increases, the frequency of the heat supply circulating pump 9 is increased, and the heat storage medium flow of the heating terminal 4 is increased, when the heat supply load demand of the heating terminal decreases, the frequency of the heat supply circulating pump is reduced, and the heat storage medium flow of the heating terminal is reduced.

[0053] The method for controlling the frequency of the heat supply circulating pump 9 according to the heat supply load of the heating terminal 4 can be achieved by using the prior art, and is not described in detail herein.

[0054] The energy storage heating system and the working method of the embodiment use the heat collecting device 5 and the low-grade waste heat source 1 to store heat in the heat storage device 3, avoid the use of high-grade energy and the waste of energy quality, and use the heat of the low-grade waste heat source 1 in the heat storage device 3 to effectively collect the intermittent and unstable low-grade waste heat in the industrial process, solve the huge mismatch problem in time between industrial heat production and winter heating, avoid the waste of heat of the low-grade waste heat source, and use the heat storage device 3 for heating in the heating season, so that the heating is stable and is not affected by the environment and weather. Moreover, each circulating pipeline is provided with an independent circulating pump, the flow can be independently regulated and controlled, the fluctuation of the heat source and the change of the user load can be adapted, and the applicability of the whole system is improved.

[0055] The above only describes the preferred embodiments of the present application and is not used to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cross-seasonal energy storage heating system, characterized in that, The system comprises: a heat exchanger having a primary side flow channel and a secondary side flow channel capable of heat exchange; a low-grade heat source, the outlet of which is connected to the inlet of the primary side flow channel through a heat source circulating pump, and the inlet of which is connected to the outlet of the primary side flow channel; a heat storage device, the low-temperature zone of which is connected to the inlet of the secondary side flow channel through a heat storage circulating pump, and the high-temperature zone of which is connected to the outlet of the secondary side flow channel; a heat collection device, the inlet of which is connected to the low-temperature zone of the heat storage device through a reheating circulating pump, and the outlet of which is connected to the high-temperature zone of the heat storage device; a heat supply circulating pipeline is arranged between the high-temperature zone and the low-temperature zone of the heat storage device, the heat supply circulating pipeline is used to connect a heating terminal, and a heat supply circulating pump is further arranged on the heat supply circulating pipeline, the heat supply circulating pump is arranged between the heating terminal connection position and the high-temperature zone of the heat supply circulating pipeline.

2. A cross-seasonal energy storage heating system as claimed in claim 1, wherein, The heat storage device adopts a layered heat storage reservoir, a water storage tank, a phase change material heat storage tank, or a borehole ground heat system.

3. A cross-seasonal energy storage heating system as claimed in claim 1, wherein, The heat collection device adopts a solar heat collector, an air source heat pump, or a boiler.

4. A cross-seasonal energy storage heating system as claimed in claim 1, wherein, The low-grade waste heat source adopts an industrial waste heat slurry source.

5. A cross-seasonal energy storage heating system as claimed in claim 1, wherein, The high-temperature zone of the heat storage device is provided with a first temperature detection element, and the low-temperature zone is provided with a second temperature detection element.

6. A cross-seasonal energy storage heating system as claimed in claim 1, wherein, A third temperature detection element is arranged at the outlet of the heat collection device.

7. A working method of the cross-season energy storage heating system according to any one of claims 1-6, characterized in that: heat storage in a non-heating season: the heat source circulating pump and the heat storage circulating pump are operated, the heat source medium of the low-grade waste heat source enters the primary side flow channel of the heat exchanger, and the heat storage medium in the heat storage device enters the secondary side flow channel of the heat exchanger under the action of the heat storage circulating pump, exchanges heat with the low-grade waste heat source medium in the primary side flow channel, and is heated until the temperature of the heat storage medium in the high-temperature zone of the heat storage device exceeds the first set temperature; the heat source circulating pump is turned off, the reheating circulating pump is turned on, the heat storage medium in the heat storage device is heated again by the heat collection device until the temperature of the heat storage medium in the low-temperature zone of the heat storage device reaches the second set temperature; heat release in a heating season: the heat supply circulating pump is operated, and the heat storage medium stored in the heat storage device in the non-heating season flows through the heating terminal through the heat supply circulating pipeline to heat the heating terminal.

8. The method of operating a cross-seasonal energy storage heating system of claim 7, wherein, The first set temperature is 58-62°C, preferably 60°C, and the second set temperature is 88-92°C, preferably 90°C.

9. The method of operating a cross-seasonal energy storage heating system of claim 7, wherein, When the outlet temperature of the heat collection device is greater than the sum of the temperature of the heat storage medium in the high-temperature zone and the set temperature difference, the reheating circulating pump is restarted. Further, the set temperature difference is 4-6°C, preferably 5°C.

10. The method of operating a cross-seasonal energy storage heating system of claim 7, wherein, When the temperature of the heat storage medium in the low-temperature zone is less than the third set temperature, the heat source circulating pump and the heat storage circulating pump are restarted, and the third set temperature is less than the first set temperature.

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