A heat storage system and heat storage and supply method for a boiler coupled with a ground source heat pump

Abstract

The application discloses a heat storage system and a heat storage and supply method of a boiler coupled with a ground source heat pump, and belongs to the technical field of energy conversion.The heat storage system comprises an energy supply unit, a slag removal unit, an exchange unit, an energy storage unit, a ground source heat pump and a heat user, wherein the energy supply unit comprises a boiler and a flue arranged on the boiler; the slag removal unit comprises a working shell arranged on the flue, a slag removal mechanism arranged in the working shell and a collection mechanism arranged below the slag removal mechanism.The high-temperature flue gas generated by the boiler is introduced into the exchange unit and the energy storage unit after slag removal, so that the high-temperature flue gas entering the exchange unit is more pure and the gas is more uniform, the heat exchange efficiency is effectively improved, and the energy storage efficiency is improved; meanwhile, the high heat storage capacity and low heat loss rate of the soil make the ground source heat pump system have great potential in cross-season heat storage, and the combination of the boiler and the geothermal energy improves the efficiency and flexibility of the overall heat storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy conversion, and in particular to a heat storage system of a boiler coupled with a ground source heat pump and a heat storage and heating method. Background Art

[0002] With the rapid development of science, technology, and the economy, non-renewable energy sources such as coal, oil, and natural gas are facing increasing challenges. They can no longer meet the needs of modern society. The depletion of fossil energy sources has prompted the search for renewable energy to replace non-renewable energy sources. Furthermore, pollutants such as carbon dioxide and sulfur dioxide produced during the combustion of fossil fuels have caused severe environmental damage, profoundly impacting human life and the global climate.

[0003] Vigorously promoting the integrated development of fossil energy and diverse renewable energy sources is a key strategy for achieving energy transition and promoting sustainable development. By combining the stability of fossil energy with the sustainability of renewable energy, a more diversified and balanced energy structure can be established, reducing reliance on a single energy source. Furthermore, renewable energy sources generally have lower carbon emissions and environmental impacts. Their combined use with fossil energy sources can help reduce greenhouse gas emissions, combat climate change, and improve air quality. Common fossil fuels, such as coal, produce fly ash during combustion. This ash, due to collisions and adhesions in the molten state, forms a honeycomb-like composite particle with a rough surface and numerous edges. After long-term operation, fly ash often adheres to the inner wall of the flue, significantly affecting energy conversion and heat storage efficiency. Furthermore, due to climate change, human demand for energy is not constant. Under high energy demand conditions, a single fossil energy source or renewable energy source cannot meet human needs. Under low energy demand conditions, the unique properties of energy can also lead to losses during storage, resulting in energy waste.

[0004] To this end, it is necessary to propose a heat storage and heating system that couples fossil energy and new energy. Summary of the Invention

[0005] In view of the above-mentioned problems existing in the existing heat storage system of the boiler coupled with the ground source heat pump, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a heat storage system for a boiler coupled with a ground-source heat pump, the purpose of which is to solve the problem that common fossil energy sources such as coal generate fly ash during the combustion process. The fly ash collides with each other in the molten state and sticks together, forming honeycomb-shaped composite particles with rough surfaces and many edges and corners. After long-term operation, the fly ash often adheres to the inner wall of the flue, greatly affecting the energy conversion efficiency and heat storage efficiency.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0008] An energy supply unit, comprising a boiler and a flue provided on the boiler;

[0009] a slag removal unit comprising a working shell provided on the flue, a slag removal mechanism provided inside the working shell, and a collection mechanism provided below the slag removal mechanism;

[0010] an exchange unit, comprising a heat exchanger disposed on the flue;

[0011] An energy storage unit includes an underground pipe heat storage body connected to the heat exchanger through the flue;

[0012] Also, a ground source heat pump connected to the buried pipe heat storage body through the flue is provided to a heat user at the system terminal through the flue.

[0013] As a preferred solution of the heat storage system of the boiler coupled to the ground source heat pump of the present invention, wherein: the working shell includes a smooth shell arranged on the flue, a different diameter area arranged below the smooth shell, and an olive-shaped area arranged below the different diameter area;

[0014] A cavity is provided inside the working shell.

[0015] As a preferred solution of the heat storage system of the boiler coupled to the ground source heat pump of the present invention, the slag removal mechanism includes a slag removal scraper block arranged inside the working shell, a telescopic assembly arranged inside the slag removal scraper block, and an ash guide fin connected to the telescopic assembly through an axis.

[0016] As a preferred solution of the heat storage system of the boiler coupled with the ground source heat pump of the present invention, the slag removal mechanism further includes a filter plate arranged between the slag removal unit and the exchange unit.

[0017] As a preferred solution of the heat storage system of the boiler coupled with the ground source heat pump of the present invention, the telescopic assembly includes a telescopic rod 1 arranged inside the slag scraper block, a telescopic rod 2 sleeved inside the telescopic rod 1, and a stopper arranged on the telescopic rod 2 near the outlet end of the telescopic rod 1.

[0018] As a preferred solution of the heat storage system of the boiler coupled with the ground source heat pump of the present invention, the collection mechanism includes a dust collection box arranged below the ash guide fins.

[0019] As a preferred solution of the heat storage system of the boiler coupled with the ground source heat pump of the present invention, the slag scraping block includes a plurality of groups of annular blocks elastically connected to each other.

[0020] The beneficial effects of the present invention are as follows: by removing the slag from the high-temperature flue gas generated by the boiler and then introducing it into the exchange unit and the energy storage unit, the high-temperature flue gas entering the exchange unit is made purer and the gas is more uniform, which effectively improves the heat exchange efficiency and thus the energy storage efficiency. At the same time, the high heat storage capacity and low heat loss rate of the soil make the ground source heat pump system have great potential in cross-seasonal heat storage. The combination of boiler and geothermal energy also improves the efficiency and flexibility of the overall heat storage system.

[0021] Another object of the present invention is to provide a heat storage and heating method for a heat storage system of a boiler coupled to a ground source heat pump, the purpose of which is to solve the problem that under high energy demand conditions, a single fossil energy or new energy source cannot meet human needs, and under low energy demand conditions, due to the special properties of energy, it will also cause loss during the storage period, resulting in energy waste.

[0022] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0023] The high-temperature flue gas generated by the boiler enters the flue. When passing above the deslagging unit, the coal ash in the high-temperature flue gas enters the deslagging unit through the bottom of the curved section. The high-temperature flue gas continues to enter the exchange unit along the flue, and the heat energy is transferred to the energy storage unit along the flue through the exchange medium.

[0024] As a preferred solution of the heat storage and heating method of the heat storage system of the boiler coupled to the ground source heat pump of the present invention, during the peak period of heat use, the valve is adjusted so that the heat provided by the heat exchanger, the heat stored in the buried pipe heat storage body and the heat heated by the ground source heat pump enter the heat user together.

[0025] As a preferred solution of the heat storage and heating method of the heat storage system of the boiler coupled with the ground source heat pump of the present invention, wherein: during the off-peak or off-peak period of heat consumption, the valve is adjusted so that the flue gas from the buried heat storage pipe to the ground source heat pump and from the ground source heat pump to the heat user is closed;

[0026] The heat provided by the heat exchanger enters the buried pipe heat storage body and the heat user respectively through the flue.

[0027] The beneficial effects of the present invention are as follows: by controlling the transfer, storage and energy supply of heat through the setting of flues and valves, the system stores thermal energy during off-peak hours and releases it during peak hours, which helps to balance energy demand, reduce energy waste, and improve the economy and sustainability of the entire energy system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0029] Figure 1 This is a schematic diagram of the overall structure of the heat storage system of the boiler coupled with the ground source heat pump of the present invention.

[0030] Figure 2 This is a schematic structural diagram of the deslagging unit of the heat storage system of the boiler coupled to the ground source heat pump of the present invention.

[0031] Figure 3 This is a schematic cross-sectional structure diagram of the deslagging unit of the heat storage system of the boiler coupled to the ground source heat pump of the present invention.

[0032] Figure 4 This is a schematic diagram of the telescopic component structure of the heat storage system of the boiler coupled to the ground source heat pump of the present invention. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0036] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0037] Example 1

[0038] Reference Figure 1-Figure 3, which is the first embodiment of the present invention, provides a heat storage system for a boiler coupled to a ground source heat pump. The device includes an energy supply unit 100, including a boiler 101 and a flue 102 provided on the boiler 101; a slag removal unit 200, including a working shell 201 provided on the flue 102, a slag removal mechanism 202 provided inside the working shell 201, and a collection mechanism 203 provided below the slag removal mechanism 202; an exchange unit 300, including a heat exchanger 301 provided on the flue 102; an energy storage unit 400 , including a buried pipe heat storage body 401 connected to the heat exchanger 301 through a flue 102; and a ground source heat pump 500 connected to the buried pipe heat storage body 401 through the flue 102, and a heat user 600 set at the system terminal through the flue 102; wherein, a water pump and a valve are provided on the flue 102 pipeline, and the high-temperature flue gas generated by the boiler enters the deslagging unit 200 and is purified, and then the high-temperature flue gas enters the exchange unit 300, and the heat energy is transferred to the energy storage unit 400 or directly enters the heat user 600 through the adjustment of the water pump and the valve.

[0039] The working shell 201 includes a smooth shell 201a provided on the flue 102, a different diameter area M provided below the smooth shell 201a, and an olive-shaped area N provided below the different diameter area M.

[0040] A cavity Q is provided inside the working shell 201. After the coal ash in the high-temperature flue gas enters the slag removal unit 200, it moves downward along the inner wall of the working shell 201 along the smooth shell 201a, the different-diameter area M, and the olive-shaped area N in sequence. Due to the structural setting of the different-diameter area M with large ends and a small middle, the flow velocity of the coal ash increases when passing through the part with the smallest diameter, thereby effectively preventing the coal ash from adhering to the inner wall of the working shell 201 and improving the efficiency of removing the coal ash.

[0041] During use, the high-temperature flue gas generated by the boiler 101 enters the flue 102. When passing through the slag removal unit 200, the coal ash in the flue gas enters the slag removal unit 200 under the action of gravity. The purified flue gas enters the exchange unit 300, and then continues to move to the energy storage unit 400 or the heat user 600. When the heat energy moved to the energy storage unit 400 is stored in the buried pipe heat storage body 401, the soil has a large heat storage capacity and a small heat loss, thereby improving the storage efficiency of the heat energy. When the stored heat energy is used, the heat energy enters the heat user 600 together with the geothermal energy heated by the geothermal heat pump 500 through the geothermal heat pump 500, thereby realizing efficient heat conversion and energy utilization efficiency.

[0042] After the coal ash enters the slag removal unit 200, it continues to descend along the inner wall of the smooth shell 201a. When passing through the different diameter area M, since this area is large at both ends and small in the middle, the pipe diameter is reduced, which increases the local pressure and the flow rate of the coal ash, effectively preventing the coal ash from adhering to the inner wall of the working shell 201. Through the design of the cavity Q inside the working shell 201, the vibration of the air can be used to clean the coal ash on the inner wall of the working shell 201 by knocking on the outside of the working shell 201, so that the coal ash can smoothly enter the collection mechanism 203. When the slag removal unit 200 needs to be cleaned, only the collection mechanism 203 needs to be disassembled and cleaned.

[0043] Example 2

[0044] Reference Figure 1 - Figure 4 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the slag removal mechanism 202 includes a slag removal scraper 202a arranged inside the working shell 201, a telescopic component 202b arranged inside the slag removal scraper 202a, and an ash guide fin 202c connected to the telescopic component 202b through a shaft. After the coal ash enters the slag removal mechanism 202, under the rotation of the ash guide fin 202c, the coal ash moves with the rotation of the air and enters the dust removal mechanism below through the ash guide fin 202c. When it is necessary to clean the coal ash on the inner wall of the working shell 201, the shaft is pulled to move the slag removal scraper 202a downward. The telescopic mechanism ensures that the outer surface of the slag removal scraper 202a is always in contact with the inner wall of the working shell 201 when it moves on the inner wall of the working shell 201, thereby effectively improving the slag removal efficiency. After the slag removal scraper 202a passes through the different diameter area M, the coal ash scraped by it descends into the olive-shaped area N with a larger diameter, thereby effectively preventing the coal ash from continuing to adhere to the inner wall.

[0045] Preferably, the power source of the shaft can be external manpower or an external power supply.

[0046] Compared with Example 1, the slag removal mechanism 202 further includes a filter plate 202d arranged between the slag removal unit 200 and the exchange unit 300. During the movement of high-temperature flue gas, the coal ash that fails to enter the slag removal unit 200 smoothly is filtered when passing through the filter plate 202d, thereby improving the ash removal effect of the flue gas and improving the efficiency of heat exchange.

[0047] Compared with Example 1, the telescopic component 202b further includes a telescopic rod 1 202b-1 arranged inside the slag scraper 202a, a telescopic rod 202b-2 sleeved inside the telescopic rod 1 202b-1, and a stopper 202b-3 arranged on the telescopic rod 202b-2 near the outlet end of the telescopic rod 1 202b-1. When the telescopic component 202b is in the extreme extension state, coal ash may fall on the surface of the telescopic rod 2 202b-2. When the telescopic component 202b retracts, the telescopic rod 2 202b-2 enters the interior of the telescopic rod 1 202b-1. At this time, the inner wall of the telescopic rod 1 202b-1 is tightly fitted with the stopper 202b-3, effectively preventing the coal ash from entering the interior of the telescopic rod 1 202b-1. At the same time, the outlet end of the telescopic rod 1 202b-1 is fitted with the outer surface of the telescopic rod 2 202b-2, preventing the coal ash thereon from adhering to the surface of the telescopic rod 2 202b-2.

[0048] Compared with embodiment 1, further, the collecting mechanism 203 includes a dust collecting box 203a provided below the dust guiding fins 202c.

[0049] Compared with Example 1, the slag scraper 202a further includes multiple groups of annular blocks 202a-1 elastically connected to each other. When the slag scraper 202a moves up and down on the inner wall of the working shell 201, the annular blocks 202a-1 change their diameters accordingly in areas with different diameters, and are always in contact with the inner wall of the working shell 201 under the action of the telescopic mechanism. When the ash guide fins 202c rotate and drive the slag scraper 202a to rotate, the inner wall of the working shell 201 can also be cleaned horizontally.

[0050] The remaining structures are the same as those of Example 1.

[0051] Example 3

[0052] Reference Figure 1 - Figure 4 , which is the third embodiment of the present invention, is based on embodiment 1 and embodiment 2 and provides a heat storage and heating method of a heat storage system of a boiler coupled with a ground source heat pump, comprising:

[0053] The high-temperature flue gas generated by the operation of the boiler 101 enters the flue 102. When passing above the slag removal unit 200, the coal ash in the high-temperature flue gas enters the slag removal unit 200 through the bottom of the curved section K. The high-temperature flue gas continues to enter the exchange unit 300 along the flue 102, and the heat energy is further transferred to the energy storage unit 400 along the flue 102 through the exchange medium. The high-temperature flue gas after slag removal is purer and the airflow is more stable, which improves the efficiency of heat exchange. After heat exchange, the heat energy enters the buried pipe heat storage body 401 through the flue 102 for storage, and provides energy through the ground source heat pump 500 at an appropriate time.

[0054] Compared with Example 2, further, during the peak period of heat consumption, the valve is adjusted so that the heat provided by the heat exchanger 301, the heat stored in the buried pipe heat storage body 401 and the heat heated by the ground source heat pump 500 enter the heat user 600 together, and the valve of the flue 102 leading from the heat exchanger 301 to the buried pipe heat storage body 401 is closed. At this time, the heat energy passing through the heat exchanger 301 directly enters the heat user 600 through the pipeline, and the energy stored in the buried pipe heat storage body 401 enters the heat user 600 together with the geothermal energy brought by the ground source heat pump 500 as a supplement.

[0055] Compared with Example 2, further, during off-peak hours, the valves are adjusted so that the flue 102 from the underground heat storage body 401 to the ground source heat pump 500 and from the ground source heat pump 500 to the heat user 600 is closed;

[0056] The heat provided by the heat exchanger 301 enters the buried pipe heat storage body 401 and the heat user 600 respectively through the flue 102. At this time, the heat energy passing through the heat exchanger 301 directly enters the heat user 600 through the pipeline to maintain normal life needs. The excess heat enters the buried pipe heat storage body 401 for storage through flow control. At the same time, the ground source heat pump 500 converts the geothermal energy and passes it into the buried pipe heat storage body 401 for joint storage. The high heat storage capacity and low heat loss rate of the soil make the ground source heat pump 500 system have great potential in cross-seasonal heat storage. The combination of boiler 101 and geothermal energy also improves the efficiency and flexibility of the overall heat storage system.

[0057] The remaining structures are the same as those of Example 2.

[0058] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0059] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A heat storage system of a boiler coupled with a ground source heat pump, characterized by: include, An energy supply unit (100) includes a boiler (101) and a flue (102) provided on the boiler (101); A slag removal unit (200) comprises a working shell (201) disposed on the flue (102), a slag removal mechanism (202) disposed inside the working shell (201), and a collection mechanism (203) disposed below the slag removal mechanism (202); An exchange unit (300) includes a heat exchanger (301) disposed on the flue (102); An energy storage unit (400) includes a buried pipe heat storage body (401) connected to the heat exchanger (301) via an exchange medium pipeline; and a ground source heat pump (500) connected to the buried pipe heat storage body (401) via an exchange medium pipeline, and a heat user (600) provided at a system terminal via the exchange medium pipeline; Wherein, a water pump and a valve are provided on the exchange medium pipeline; The working shell (201) comprises a smooth shell (201a) arranged on the flue (102), a different diameter area (M) arranged below the smooth shell (201a), and an olive-shaped area (N) arranged below the different diameter area (M); A cavity (Q) is provided inside the working housing (201); The slag removal mechanism (202) comprises a slag removal scraper (202a) disposed inside the working housing (201), a telescopic assembly (202b) disposed inside the slag removal scraper (202a), and an ash guide fin (202c) connected to the telescopic assembly (202b) via a shaft.

2. The boiler-coupled ground-source heat pump heat storage system according to claim 1, characterized in that: The slag removal mechanism (202) further includes a filter plate (202d) disposed between the slag removal unit (200) and the exchange unit (300).

3. The boiler-coupled ground-source heat pump heat storage system according to claim 2, characterized in that: The telescopic assembly (202b) comprises a telescopic rod 1 (202b-1) arranged inside the slag removal scraper (202a), a telescopic rod 2 (202b-2) sleeved inside the telescopic rod 1 (202b-1), and a stopper (202b-3) arranged on the telescopic rod 2 (202b-2) near the outlet end of the telescopic rod 1 (202b-1).

4. The boiler-coupled ground-source heat pump heat storage system according to claim 3, characterized in that: The collecting mechanism (203) comprises a dust collecting box (203a) arranged below the dust guiding fin (202c).

5. The boiler-coupled ground-source heat pump heat storage system according to claim 4, characterized in that: The slag removal scraper (202a) comprises a plurality of groups of annular blocks (202a-1) elastically connected to each other.

6. The heat storage and heating method of the heat storage system of the boiler coupled with the ground source heat pump according to any one of claims 1 to 5, characterized in that: include, The high-temperature flue gas generated by the operation of the boiler (101) enters the flue (102). When passing above the deslagging unit (200), the coal ash in the high-temperature flue gas enters the deslagging unit (200) through the bottom of the curved section (K). The high-temperature flue gas continues to flow along the flue (102) into the exchange unit (300), and the heat energy is continuously transferred to the energy storage unit (400) along the exchange medium pipeline through the exchange medium.

7. The heat storage and heating method of the heat storage system of the boiler coupled to the ground source heat pump according to claim 6, characterized in that: During the peak heat consumption period, the valve is adjusted so that the heat provided by the heat exchanger (301), the heat stored in the buried pipe heat storage body (401), and the heat heated by the ground source heat pump (500) enter the heat user (600) together.

8. The heat storage and heating method of the heat storage system of the boiler coupled to the ground source heat pump according to claim 7, characterized in that: During off-peak periods, the valves are adjusted so that the exchange medium pipelines from the buried heat storage body (401) to the ground source heat pump (500) and from the ground source heat pump (500) to the heat user (600) are closed; The heat provided by the heat exchanger (301) enters the buried heat storage body (401) and the heat user (600) respectively through the exchange medium pipeline.

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