High-temperature fluid waste heat recovery device

Abstract

A high-temperature fluid waste heat recovery device is composed of a solid heat storage system, a first heat exchange system and a second heat exchange system, the solid heat storage system is composed of n solid heat storage bodies, and the n solid heat storage bodies are stacked and arranged in the vertical direction; the first heat exchange system is composed of n high-temperature fluid heat radiators, the n high-temperature fluid heat radiators communicate with a high-temperature fluid heat source through pipelines, high-temperature fluid circulates in the pipelines, and the output end of each high-temperature fluid heat radiator communicates with the solid heat accumulator. In the second heat exchange system, n saturated steam generators are stacked in the vertical direction; the n-1 saturated steam generators are connected with the steam pocket through lower connecting pipes, water circulates in the lower connecting pipes, the input ends of the n saturated steam generators are communicated to the solid heat storage body, the temperature gradient value of the solid heat storage system is increased, and conditions are established for providing steam output with high parameters.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature fluid waste heat recovery and storage technology, specifically a solid heat storage device that stores the waste heat of high-temperature and high-pressure fluid in a solid material and can release a high-parameter heat medium in a second stable manner. Background Technology

[0002] Currently, many thermal circulation systems, such as internal combustion engine systems, industrial kiln systems, or heat pump cooling systems, can discharge large amounts of high-temperature, high-pressure hot fluids with temperatures ≤800℃ and pressures ≤20MPa. These hot fluids are not continuous and cannot be used as stable heat sources. Generally, air-cooled or water-cooled heat dissipation devices are used to absorb heat and convert high-temperature heat into low-temperature hot water or steam for output. If we want to make better use of these thermal energies and output high-temperature steam for industrial production or to drive steam turbines for power generation, we must do two things: (1) realize stable and reliable storage of randomly and discontinuously discharged thermal energy and be able to controllably output stable thermal energy; (2) increase the temperature value of waste heat energy storage as much as possible so that it has the ability to output steam with higher parameters for secondary heat release. At present, there is no equipment that can do the above two things. Summary of the Invention

[0003] In view of the above technical requirements, the purpose of this utility model is to provide a high-temperature fluid waste heat recovery device and its gradient heating method, which aims to use solid materials as waste heat recovery carriers. Specifically, it is a solid heat storage device that stores the waste heat of high-temperature and high-pressure fluids in solid materials and can release high-parameter steam in a second stable manner.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a high-temperature fluid waste heat recovery device, comprising a solid heat storage system, a first heat exchange system, and a second heat exchange system. The solid heat storage system consists of n solid heat storage bodies, designated as the first to the nth solid heat storage bodies, stacked vertically. The first heat exchange system consists of n high-temperature fluid heat exchangers, designated as the first to the nth high-temperature fluid heat exchangers, with high-temperature fluid circulating between them via pipelines. The output end of each high-temperature fluid heat exchanger is connected to a solid heat storage body. The second heat exchange system includes n saturated steam generators and a steam drum. The saturated steam generators are designated as the first to the nth saturated steam generators. Water circulates between the n-1 saturated steam generators and the steam drum via pipelines and connecting pipes. The input ends of the n saturated steam generators are connected to the solid heat storage bodies.

[0006] Furthermore, the solid heat storage body is a geometric body made of heat-resistant material with a thermal conductivity ≥0.8W / mK, such as sintered brick, stone or recycled metal. The first solid heat storage body is set at the top of the solid heat storage system and connected to the lower second solid heat storage body.

[0007] The second solid heat storage body is provided with the lower part of the first solid heat storage body and the upper part of the third solid heat storage body, and is connected to the upper and lower solid heat storage bodies thereon.

[0008] The third solid heat storage body is provided with the lower part of the second solid heat storage body and the upper part of the fourth solid heat storage body, and is connected to the upper and lower solid heat storage bodies thereon.

[0009] The (n-1)th solid heat storage body is provided with a lower part of the (n-2)th solid heat storage body and an upper part of the nth solid heat storage body, and is connected to the upper and lower solid heat storage bodies thereon;

[0010] The nth solid heat storage body is located at the bottom of the solid heat storage system and is connected to the (n-1)th solid heat storage body above it.

[0011] Furthermore, the high-temperature fluid heat exchanger consists of a shell-and-tube heat exchanger and a circulating fan.

[0012] The first high-temperature fluid heat exchanger is located at the top of the first heat exchange system and is connected to the lower second high-temperature fluid heat exchanger.

[0013] The second high-temperature fluid heat exchanger is provided at the lower part of the first high-temperature fluid heat exchanger and the upper part of the third high-temperature fluid heat exchanger, and is connected to the upper and lower high-temperature fluid heat exchangers thereon.

[0014] The third high-temperature fluid heat exchanger is provided at the lower part of the second high-temperature fluid heat exchanger and the upper part of the fourth high-temperature fluid heat exchanger, and is connected to the upper and lower high-temperature fluid heat exchangers thereon.

[0015] The (n-1)th high-temperature fluid heat exchanger is provided with the lower part of the (n-2)th high-temperature fluid heat exchanger and the upper part of the nth high-temperature fluid heat exchanger, and is connected to the upper and lower high-temperature fluid heat exchangers thereon.

[0016] The nth high-temperature fluid heat exchanger is located at the bottom of the first heat exchange system and is connected to the (n-1)th high-temperature fluid heat exchanger above it.

[0017] Furthermore, the superheated steam generator and the saturated steam generator are composed of a shell-and-tube heat exchanger and a circulating air mechanism;

[0018] A superheated steam generator is located above the first saturated steam generator and is connected to the steam drum;

[0019] The first saturated steam generator is located at the lower part of the steam drum and connected thereto;

[0020] The second saturated steam generator is located below the first saturated steam generator and above the third saturated steam generator, and is connected to the upper and lower steam generators thereon.

[0021] The third saturated steam generator is located below the second saturated steam generator and above the fourth saturated steam generator, and is connected to the upper and lower steam generators thereon.

[0022] The (n-1)th saturated steam generator is located above the nth saturated steam generator and is connected to the steam drum via a lower connecting pipe, and is also connected to the (n-2)th saturated steam generator at the top.

[0023] The nth saturated steam generator is located at the bottom of the second heat exchange system and is connected to the steam drum.

[0024] Furthermore, the high-temperature fluid heat exchanger circulates a high-temperature fluid, which includes high-temperature and high-pressure water, high-temperature and high-pressure gas, high-temperature flue gas, or high-temperature heat transfer oil. The high-temperature and high-pressure water, high-temperature and high-pressure gas, high-temperature flue gas, and high-temperature heat transfer oil are fluids that do not undergo phase change during the cooling process.

[0025] Furthermore, the second heat exchange system also includes a superheat generator, which is located on the top of the solid heat storage body of the solid heat storage system and is connected to the steam drum.

[0026] The technical solution adopted in this utility model has the following advantages:

[0027] This technical solution cleverly utilizes the characteristic that the high-temperature hot fluid does not undergo a phase change process during cooling, but only releases sensible heat energy. It divides the cooling range of the high-temperature hot fluid into segments corresponding to the number of solid heat storage bodies, from high to low temperature. Each solid heat storage body is allocated to store the heat energy of a segment of the high-temperature hot fluid temperature range. When the temperature of the high-temperature hot fluid flowing through this solid heat storage body is lower than the corresponding allocated storage temperature, the high-temperature fluid heat releaser corresponding to this solid heat storage body will stop working. That is, this segment of the solid heat storage body maintains its original heat storage temperature. This control method not only improves the temperature gradient value of the solid heat storage system but also creates conditions for providing higher parameters for steam output. Attached Figure Description

[0028] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0029] Figure 1 This is a front view schematic diagram of this utility model;

[0030] Figure 2This is a top view of the present invention;

[0031] Explanation of icon numbers:

[0032] 1. First solid heat storage body, 1-1. Second solid heat storage body, 1-2. Third solid heat storage body, 1-n-1. (n-1)th solid heat storage body, 1-n. (n)th solid heat storage body, 2. First high-temperature fluid heat exchanger, 2-1. Second high-temperature fluid heat exchanger, 2-2. Third high-temperature fluid heat exchanger, 2-n-1. (n-1)th high-temperature fluid heat exchanger, 2-n. (n)th high-temperature fluid heat exchanger, 3. Superheat generator, 4. First saturated steam generator, 4-1. Second saturated steam generator, 4-2. Third saturated steam generator, 4-n-1. (n-1)th saturated steam generator, 4-n. (n)th saturated steam generator, 5. Steam drum, 6. Lower connecting pipe, 7. High-temperature fluid heat source, 8. Water replenishment system, 9. Heat storage circulating fan, 10. Heat release circulating fan. Detailed Implementation

[0033] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Unless otherwise specified, the techniques used in the embodiments are conventional means well known to those skilled in the art.

[0034] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art to which this invention pertains. In this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms “connection”, “linked,” etc., should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium. The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase “comprising…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] This embodiment provides a high-temperature fluid waste heat recovery device, comprising a solid heat storage system, a first heat exchange system, and a second heat exchange system. The solid heat storage system consists of n solid heat storage bodies, arranged vertically from top to bottom as follows: first solid heat storage body 1, second solid heat storage body 1-1, third solid heat storage body 1-2, nth solid heat storage body 1-n-1 to the bottom nth solid heat storage body. The first heat exchange system consists of n high-temperature fluid heat exchangers, arranged vertically on one side of the solid heat storage system and connected to it. From top to bottom, they are: first high-temperature fluid heat exchanger 2, second high-temperature fluid heat exchanger 2-1, third high-temperature fluid heat exchanger 2-... 2. The nth high-temperature fluid heat exchanger 2-n-1 to the bottom nth high-temperature fluid heat exchanger 2-n are connected by pipelines. The inlet and outlet pipelines of the first heat exchange system are connected to the high-temperature and high-pressure fluid heat source 7 respectively. The second heat exchange system consists of a superheated steam generator and n saturated steam generators. Its overall structure is set on one side of the solid heat storage system together with the first heat exchange system and connected to it. Its structure is vertically arranged, from top to bottom: superheated generator 3, steam drum 5, first saturated steam generator 4, second saturated steam generator 4-1, third saturated steam generator 4-2, n-1th saturated steam generator 4-n-1 to the bottom nth saturated steam generator 4-n. The superheated steam generator is connected to the saturated steam generator via the steam drum. The saturated steam generators are connected to each other via water pipes. The lower inlet of the saturated steam generator 4-n-1 is connected to the lower connecting pipe 6 of the steam drum 5, forming a natural circulation system structure in the steam boiler. The n-1 saturated steam generators are connected to the steam drum 5 via the lower connecting pipe 6, and water circulates in the lower connecting pipe 6. The inlet of the n saturated steam generators is connected to the solid heat storage body. In the second heat exchange system, the lower inlet water supply pipe of the nth saturated steam generator 4-n is connected to the water supply system 8, and the upper outlet of the nth saturated steam generator 4-n is connected to the steam drum 5.

[0036] The high-temperature fluid heat exchanger consists of a shell-and-tube heat exchanger and a thermal regenerator circulating fan 9. n such high-temperature fluid heat exchangers include:

[0037] The first high-temperature fluid heat exchanger 2 is located at the top of the first heat exchange system and is connected to the lower second high-temperature fluid heat exchanger 2-1;

[0038] The second high-temperature fluid heat exchanger 2-1 is provided at the lower part of the first high-temperature fluid heat exchanger 2 and the upper part of the third high-temperature fluid heat exchanger 2-2, and is connected to the upper and lower high-temperature fluid heat exchangers thereon.

[0039] The third high-temperature fluid heat exchanger 2-2 is provided at the lower part of the second high-temperature fluid heat exchanger 2-1 and the upper part of the fourth high-temperature fluid heat exchanger, and is connected to the upper and lower high-temperature fluid heat exchangers thereon.

[0040] The (n-1)th high-temperature fluid heat exchanger 2-n-1 is provided with the lower part of the (n-2)th high-temperature fluid heat exchanger and the upper part of the nth high-temperature fluid heat exchanger 2-n, and is connected to the upper and lower high-temperature fluid heat exchangers thereon.

[0041] The nth high-temperature fluid heat exchanger 2-n is located at the bottom of the first heat exchange system and is connected to the (n-1)th high-temperature fluid heat exchanger 2-n-1 above it.

[0042] A saturated steam generator, comprising a shell-and-tube heat exchanger and a heat release circulating fan 10, wherein n saturated steam generators include:

[0043] The first saturated steam generator 4 is located at the lower part of the steam drum 5 and is connected to it;

[0044] The second saturated steam generator 4-1 is located below the first saturated steam generator 4 and above the third saturated steam generator 4-2, and is connected to the upper and lower steam generators thereon.

[0045] The third saturated steam generator 4-2 is located below the second saturated steam generator 4-1 and above the fourth saturated steam generator, and is connected to its upper and lower steam generators.

[0046] The n-1th saturated steam generator 4-n-1 is located above the nth saturated steam generator 4-n and is connected to the steam drum 5 via a lower connecting pipe, and is also connected to the upper n-2th saturated steam generator.

[0047] The nth saturated steam generator 4-n is located at the bottom of the second heat exchange system and is connected to the steam drum 5.

[0048] A high-temperature fluid waste heat recovery device's heat storage process: A high-temperature, high-pressure fluid heat source 7 enters through a pipe via a first high-temperature fluid heat exchanger 2 in a first heat exchange system. The first high-temperature fluid heat exchanger 2 intercepts the high-quality fluid heat energy of the high-temperature, high-pressure fluid heat source 7 and sends it to a first solid heat storage body 1 for heat energy storage. The solid material of the solid heat storage body can be natural stone, slag, metal, or traditional refractory materials, etc. After the heat energy is intercepted by the first high-temperature fluid heat exchanger 2, it sequentially enters a second high-temperature fluid heat exchanger 2-1, a third high-temperature fluid heat exchanger 2-3, and so on, from the (n-1)th high-temperature fluid heat exchanger 2-n-1 to the nth high-temperature fluid heat exchanger 2-n. Each high-temperature fluid heat exchanger intercepts the corresponding... The heat energy from the high-temperature, high-pressure fluid heat source 7 is distributed in a gradient manner and stored in the corresponding second solid heat storage body 1-1, third solid heat storage body 1-2, and so on up to the nth solid heat storage body 1-n. This allows for more efficient and fuller secondary utilization of the heat energy in the solid heat storage body. After passing through the nth high-temperature fluid heat exchanger 2-n at the bottom of the first heat exchange system, the heat energy is returned to the original high-temperature fluid heat source 7 via pipeline, completing the heat storage process. A temperature sensor can be installed at the rear end of each high-temperature fluid heat exchanger. The high-temperature fluid heat exchanger can only operate when the heat energy of each fluid segment meets the heat storage requirements of the corresponding solid heat storage body. Otherwise, it directly enters the next stage of high-temperature fluid heat exchanger.

[0049] A high-temperature, high-pressure fluid waste heat recovery solid heat storage device's heat release process: After the heat storage process is completed, the device can continuously or periodically output the heat energy stored in the solid heat storage body according to user needs. First, the water supply system 8 is started, and the water supply pipeline enters the bottom nth saturated steam generator 4-n in the second heat exchange system. The nth saturated steam generator 4-n releases the heat energy stored in the bottom nth solid heat storage body 1-n of the solid heat storage system to heat the water supply. The upper output port of the saturated steam generator 4-n is connected to the steam drum 5, and the preheated water is transported to the steam drum 5. The lower connecting pipe 6, the first saturated steam generator 4, the second saturated steam generator 4-1, the third saturated steam generator 4-2, and the (n-1)th saturated steam generator 4-n-1 form a natural circulation system in the steam boiler. Each steam generator obtains the heat energy stored in its corresponding solid heat storage body to heat the water in the pipeline. Then, saturated steam is separated in the steam drum 5 and enters the superheater generator 3 at the top through the pipeline for superheating and output to the heat user. The superheater generator 3 also obtains the high-quality heat energy stored in the first solid heat storage body 1 at the top of the solid heat storage system. Alternatively, if the user only needs saturated steam, the superheater generator 3 at the top of the second heat exchange system can be omitted, and saturated steam can be output directly. The structural arrangement and heat release process are the same as above.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A high-temperature fluid waste heat recovery device, characterized in that, The system comprises a solid heat storage system, a first heat exchange system, and a second heat exchange system. The solid heat storage system consists of n solid heat storage bodies, namely the first to the nth solid heat storage bodies, which are stacked vertically. The first heat exchange system consists of n high-temperature fluid heat exchangers, namely the first to the nth high-temperature fluid heat exchangers, which are connected to a high-temperature fluid heat source (7) through pipelines, and high-temperature fluid circulates in the pipelines. The output end of each high-temperature fluid heat exchanger is connected to a solid heat storage body. The second heat exchange system includes n saturated steam generators and a steam drum (5), namely the first to the nth saturated steam generators, which are stacked vertically. The n-1 saturated steam generators are connected to the steam drum (5) through a lower connecting pipe (6), and water circulates in the lower connecting pipe (6). The input ends of the n saturated steam generators are connected to the solid heat storage bodies.

2. The high-temperature fluid waste heat recovery device according to claim 1, characterized in that, The solid heat storage body is a geometric shape made of heat-resistant material with a thermal conductivity ≥0.8W / mK, such as sintered brick, stone, or recycled metal. The n solid heat storage bodies include: The first solid heat storage body (1) is set at the top of the solid heat storage system and is connected to the lower second solid heat storage body (1-1); The second solid heat storage body (1-1) is provided with the lower part of the first solid heat storage body (1) and the upper part of the third solid heat storage body (1-2), and is connected to the upper and lower solid heat storage bodies thereon; The third solid heat storage body (1-2) is provided with the lower part of the second solid heat storage body (1-1) and the upper part of the fourth solid heat storage body, and is connected to the upper and lower solid heat storage bodies thereon; The (n-1)th solid heat storage body (1-n-1) is provided with the lower part of the (n-2)th solid heat storage body and the upper part of the nth solid heat storage body (1-n), and is connected to the upper and lower solid heat storage bodies thereon; The nth solid heat storage body (1-n) is located at the bottom of the solid heat storage system and is connected to the (n-1)th solid heat storage body (1-n-1) above it.

3. The high-temperature fluid waste heat recovery device according to claim 1, characterized in that, The high-temperature fluid heat exchanger consists of a shell-and-tube heat exchanger and a heat storage circulating fan (9), and n such high-temperature fluid heat exchangers include: The first high-temperature fluid heat exchanger (2) is located at the top of the first heat exchange system and is connected to the lower second high-temperature fluid heat exchanger (2-1); The second high-temperature fluid heat exchanger (2-1) is provided at the lower part of the first high-temperature fluid heat exchanger (2) and the upper part of the third high-temperature fluid heat exchanger (2-2), and is connected to the upper and lower high-temperature fluid heat exchangers thereon. The third high-temperature fluid heat exchanger (2-2) is provided at the lower part of the second high-temperature fluid heat exchanger (2-1) and the upper part of the fourth high-temperature fluid heat exchanger, and is connected to the upper and lower high-temperature fluid heat exchangers thereon. The (n-1)th high-temperature fluid heat exchanger (2-n-1) is provided with the lower part of the (n-2)th high-temperature fluid heat exchanger and the upper part of the nth high-temperature fluid heat exchanger (2-n), and is connected to the upper and lower high-temperature fluid heat exchangers thereon. The nth high-temperature fluid heat exchanger (2-n) is located at the bottom of the first heat exchange system and is connected to the (n-1)th high-temperature fluid heat exchanger (2-n-1) above it.

4. The high-temperature fluid waste heat recovery device according to claim 1, characterized in that, The saturated steam generator consists of a shell-and-tube heat exchanger and a heat release circulating fan (10), and the n saturated steam generators include: The first saturated steam generator (4) is located at the lower part of the steam drum (5) and connected to it; The second saturated steam generator (4-1) is located below the first saturated steam generator (4) and above the third saturated steam generator (4-2), and is connected to its upper and lower steam generators. The third saturated steam generator (4-2) is located below the second saturated steam generator (4-1) and above the fourth saturated steam generator, and is connected to its upper and lower steam generators. The n-1th saturated steam generator (4-n-1) is located above the nth saturated steam generator (4-n) and is connected to the steam drum (5) via a lower connecting pipe, and is connected to the n-2th saturated steam generator at the top. The nth saturated steam generator (4-n) is located at the bottom of the second heat exchange system and is connected to the steam drum (5).

5. A high-temperature fluid waste heat recovery device according to claim 1, characterized in that, The high-temperature fluid heat exchanger circulates a high-temperature fluid, which includes high-temperature and high-pressure water, high-temperature and high-pressure gas, high-temperature flue gas, or high-temperature heat transfer oil. The high-temperature and high-pressure water, high-temperature and high-pressure gas, high-temperature flue gas, and high-temperature heat transfer oil are fluids that do not undergo phase change during the cooling process.

6. A high-temperature fluid waste heat recovery device according to claim 1, characterized in that, The second heat exchange system also includes a superheat generator (3), which is located on the top of the solid heat storage body of the solid heat storage system and is connected to the steam drum (5).

Images