A heat energy recovery device for aerospace furnace coal grinding system

Abstract

The present invention relates to the technical field of heat energy recovery, and specifically discloses a high-temperature gas heat energy recovery device in a coal grinding system; it comprises a heat exchange box and a condensate collection box connected up and down, the lower end of the heat exchange box is provided with an air inlet channel, the upper end is provided with an exhaust channel, the heat exchange box is respectively provided with a cold water tank and a hot water tank, a heat exchange tube with one end extending into the hot water tank is fixedly provided in the heat exchange box, the cold water tank is connected with an inner tube which is fitted and inserted into the heat exchange tube, a one-way valve is provided at the end of the inner tube facing the hot water tank, a first telescopic driving part connected to the cold water tank is provided on the heat exchange box, and an elastic sealing assembly is provided in the hot water tank; the heat energy recovery device of the present invention can concentrate on heat exchange of a part of cold water to heat it up, and then discharge it for use after it is heated to the required temperature, and the heated hot water can be directly put into use without secondary heating, and at the same time, there is no time pause in the entire water exchange process, so that the heat energy in the high-temperature gas is fully utilized.

Description

Technical Field

[0001] The invention relates to the technical field of heat energy recovery, and in particular discloses a high-temperature gas heat energy recovery device in a coal grinding system. Background Art

[0002] When the gasifier pulverized coal drying system is in operation, the synthesis gas from the scrubber and air are burned in the inert gas generator. The high-temperature inert gas generated during the combustion process enters the pulverizer to dry and transport the coal powder. The high-temperature inert gas is used as a flow medium to carry the coal powder into the pulverized coal bag filter for air-powder separation. However, most of the separated inert gas is directly discharged into the atmosphere, resulting in a large amount of heat energy in the inert gas cannot be fully recovered and utilized.

[0003] Existing heat recovery devices use tubular heat exchangers to exchange heat energy in high-temperature media with circulating water. Specifically, during operation, high-temperature gas is passed into the interior of the heat exchanger, and circulating water is continuously passed into the heat exchange tubes inside the heat exchanger. The circulating water is used to absorb the heat energy in the high-temperature gas, thereby achieving a certain heat recovery effect. For example, the invention patent 2020101887982 discloses a heat recovery device for an aerospace furnace coal grinding system, which includes a circulating fan, a first vent pipe, a heat exchanger, a water inlet pipe, and a second vent pipe. The air inlet of the circulating fan is connected to the coal grinding system; one end of the first vent pipe is connected to the air outlet of the circulating fan; the air inlet of the heat exchanger is connected to the other end of the first vent pipe; the water inlet pipe passes heat exchange medium into the heat exchanger, and one end of the water inlet pipe is connected to the water inlet of the heat exchanger; one end of the second vent pipe is connected to the air outlet of the heat exchanger, and the other end is connected to the atmosphere. The heat recovery device for the aerospace furnace coal pulverizing system achieves heat exchange by continuously circulating water through the heat exchanger, allowing it to contact the high-temperature gas entering the heat exchanger. However, because the water is in a constant circulation process, this type of heat recovery device cannot effectively control the water after heat exchange to an optimal temperature for effective utilization. The water after heat exchange often needs to be heated again before it can be used. Furthermore, although most of the dust and impurities are removed by the high-temperature gas after passing through the pulverized coal bag filter, a small amount of dust and impurities are still mixed in the gas. When the gas contacts the heat exchange tubes, the water vapor mixed in will liquefy, and the dust and impurities will adhere to the outer wall of the heat exchange tubes after encountering the liquefied water. After long-term operation, the impurities adhering to the outer wall of the tubes not only affect the heat exchange effect, but also shorten the service life of the heat exchange tubes. In view of the shortcomings of existing heat recovery devices in recovering heat energy from high-temperature gas in coal pulverizing systems, the present invention proposes a heat recovery device for high-temperature gas in coal pulverizing systems that can effectively solve the above-mentioned technical problems. Summary of the Invention

[0004] The present invention aims to provide a device for recovering heat energy from high-temperature gas in a coal grinding system, so as to solve the shortcomings of existing tubular heat exchangers in recovering heat energy from high-temperature gas in a coal grinding system.

[0005] The present invention is achieved through the following technical solutions:

[0006] A high-temperature gas heat energy recovery device in a coal grinding system includes a heat exchange box and a condensate collection box connected up and down, an air inlet channel is provided at the lower end of the heat exchange box, and an exhaust channel is provided at the upper end, a cold water tank and a hot water tank are respectively provided on two pairs of side surfaces of the heat exchange box, a heat exchange tube with one end extending into the hot water tank is fixedly provided in the heat exchange box, an inner tube is connected to the cold water tank and is inserted into the heat exchange tube in a fitting manner, and a one-way valve is provided at the end of the inner tube facing the hot water tank, a first telescopic driving member connected to the cold water tank is provided on the heat exchange box, and the cold water tank moves away from or close to the heat exchange box under the action of the first telescopic driving member, and an elastic sealing component is provided in the hot water tank to block the end opening of the heat exchange tube.

[0007] During operation, the high-temperature gas heat energy recovery device for a coal pulverizing system provided by the present invention pushes the cold water tank away from the heat exchanger tank via a first telescopic drive member. As the cold water tank moves, the inner tube also moves along the heat exchanger tube. At this time, the outer opening of the heat exchanger tube is sealed by an elastic sealing assembly, causing the internal pressure to decrease. At this time, the one-way valve at the end of the inner tube is opened, allowing cold water in the cold water tank to enter the heat exchanger tube. As high-temperature gas is subsequently introduced into the coal pulverizing system, the high-temperature gas exchanges heat with the cold water in the heat exchanger tube, causing it to heat up. During the entire heat exchange process, the cold water in the heat exchanger tube does not circulate until the cold water in the heat exchanger tube is heated to the desired temperature. The cold water tank is then reversed and moved toward the heat exchanger tank. At this time, under the continuous squeezing action of the inner tube, the elastic sealing assembly is forced to open, allowing the hot water in the heat exchanger tube to enter the hot water tank for utilization. Finally, repeating the above actions allows sufficient heat exchange between the continuously injected cold water and the high-temperature gas. The hot water, heated to the desired temperature, can be directly delivered to the corresponding location for thermal energy reuse.

[0008] As a further configuration of the above solution, the heat exchange box is provided with a cleaning plate that moves axially along the heat exchange tube, and the cleaning plate is provided with cleaning holes for scraping impurities on the outer surface of the heat exchange tube.

[0009] As a further configuration of the above solution, a second telescopic driving member is provided on the heat exchange box, and a movable end of the second telescopic driving member is connected to the cleaning plate.

[0010] As a further configuration of the above solution, a guide and limiting mechanism is provided between the heat exchange box and the cleaning plate. The guide and limiting mechanism includes a guide rail provided on the top wall of the heat exchange box, and a guide rail slider matching the guide rail is provided on the cleaning plate.

[0011] As a further configuration of the above solution, an inclined sieve plate is provided in the condensate collection box, and an impurity collection trough is provided on the condensate collection box at the lower inclined end of the sieve plate.

[0012] The above solution is an improved design addressing the problem that impurities in the high-temperature gas in the coal pulverizing system tend to adhere to the outer surfaces of the heat exchange tubes, resulting in reduced heat transfer efficiency and susceptible to damage. During the operation of the high-temperature gas heat recovery device in the coal pulverizing system, the second telescopic drive member is activated at intervals, causing the cleaning plate to move back and forth along the axis of the heat exchange tube. During this movement, the cleaning plate's cleaning holes scrape all impurities from the outer surfaces of the heat exchange tubes. The scraped impurities fall onto the sieve plate for solid-liquid separation. The separated solid impurities can be collected in an impurity collection trough and regularly cleaned.

[0013] As a specific setting of the above scheme, the elastic sealing assembly includes a fixed cylinder fixedly connected to the heat exchange box, a sealing piston is connected to the fixed cylinder through an elastic member, a connecting rod extending out of the fixed cylinder is connected to the sealing piston, and a sealing plug is provided at the end of the connecting rod to block the end opening of the heat exchange tube.

[0014] As a further configuration of the above solution, the cold water tank is provided with a water filling pipe, and the hot water tank is connected to a hot water discharge pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Compared with traditional tubular heat exchangers, the heat recovery device provided by the present invention can concentrate heat exchange on a portion of cold water to raise its temperature until it reaches the required temperature and then be discharged for use. The heated hot water can be directly put into use without secondary heating.

[0017] 2. When designing the heat exchange device, this heat recovery device uses the inner and outer fitting heat exchange tubes and inner tube structure, and cooperates with the one-way valve and elastic sealing component to quantitatively and quickly add cold water to the heat exchange tubes and discharge hot water in time. There is no time pause in the entire water exchange process, so that the heat energy in the high-temperature gas is fully utilized. Its structural design is ingenious, and the heat energy recovery effect of the heat exchange device is greatly improved.

[0018] 3. The heat recovery device disclosed in the present invention is also designed with a cleaning plate for regular cleaning of the heat exchange tubes based on the characteristics of the high-temperature gas in the coal grinding system. The cleaning plate can effectively scrape off impurities attached to the outer surface of the heat exchange tube by moving back and forth along the axial direction of the heat exchange tube, thereby effectively ensuring the heat exchange effect and service life of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order 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. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention;

[0021] Figure 2 is a schematic diagram of a second three-dimensional structure of the present invention;

[0022] Figure 3 Schematic diagram of the internal planar structure of the heat exchange box in the present invention;

[0023] Figure 4 Schematic diagram of the internal three-dimensional structure of the heat exchange box in the present invention;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the cold water tank, inserted inner tube, etc. in the present invention;

[0025] Figure 6 This is a schematic diagram of the internal three-dimensional structure of Example 2 of the present invention;

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the cleaning plate, the second telescopic driving member, etc. in the present invention;

[0027] Figure 8 For the present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Figures 1 to 6 , and describes the application in detail with reference to embodiments.

[0030] Example 1

[0031] Example 1 discloses a high temperature gas heat energy recovery device in a coal grinding system. Figure 1 and attached Figure 2 The main body of the high-temperature gas heat energy recovery device comprises a heat exchanger 1, a condensate collection tank 2, a cold water tank 3, and a hot water tank 4. The heat exchanger 1 is fixedly mounted on the upper surface of the condensate collection tank 2, and the two are connected vertically, allowing the water vapor condensate in the high-temperature gas to fall into the condensate collection tank 2 under the action of gravity during the heat exchange process. An air inlet channel 101 is provided on the lower side of the heat exchanger 1, and an exhaust channel 102 is provided at the upper end of the heat exchanger 1. This allows the high-temperature gas in the coal grinding system to enter the heat exchanger 1 through the air inlet channel 101 and then be discharged through the exhaust channel 102.

[0032] The cold water tank 3 and hot water tank 4 are located on the left and right sides of the heat exchanger 1, aligned with each other. A water inlet pipe 301 is connected to the top of the cold water tank 3. Connecting this pipe to an external water source allows for continuous refilling of cold water into the cold water tank 3. A hot water discharge pipe 401 is connected to the bottom of the hot water tank 4. This pipe, connected to the hot water discharge pipe 401, allows for timely delivery of hot water after heat exchange.

[0033] Reference Attachment Figure 3 and attached Figure 4 , multiple heat exchange tubes 103 are arranged horizontally in the heat exchange box 1, and one end of the heat exchange tube 103 is fixedly connected to the left wall of the heat exchange box 1, and the other end is extended into the interior of the hot water tank 4. An elastic sealing component 5 is arranged on the right inner wall of the hot water tank 4, aligned with each heat exchange tube 103, and the elastic sealing component 5 seals the right end opening of the corresponding heat exchange tube 103. For details of the elastic sealing component 5, please refer to the attached Figure 8 It includes a fixed cylinder 501 connected to the right side wall of the hot water tank 4, a sealing piston 503 is connected to the fixed cylinder 501 through a spring 502, a connecting rod 504 extending out of the fixed cylinder 501 is connected to the sealing piston 503, and a sealing plug 505 is provided at the end of the connecting rod 504 to seal the right end opening of the heat exchange tube 101.

[0034] Reference Attachment Figure 3 and attached Figure 5On the right side of the cold water tank 3, multiple inserted inner tubes 104 are connected. Each inserted inner tube 104 is aligned with the left and right of the heat exchange tube 103, and the inserted inner tube 104 is inserted into the corresponding heat exchange tube 103. At the same time, the outer wall of the inserted inner tube 104 is fitted with the inner wall of the heat exchange tube 103, so that there is no gap between the inserted inner tube 104 and the heat exchange tube 103 for water to flow. In addition, a one-way valve 105 is provided at the right end of each inserted inner tube 104. The design of the one-way valve 105 ensures that water in the inserted inner tube 104 can only flow out but not in. A first telescopic drive member 6 is provided on the left side of the heat exchange tank 1, and the first telescopic drive member 6 is connected to the cold water tank 3. By controlling the extension or contraction of the first telescopic drive member 6, the entire cold water tank 3 and the inserted inner tube 104 can be moved left and right.

[0035] When the high-temperature gas heat energy recovery device in the coal grinding system disclosed in this embodiment 1 is in use, a sufficient amount of cold water is first injected into the cold water tank 3, and then the first telescopic drive member 6 is controlled to extend, thereby synchronously pushing the entire cold water tank 3 and the inserted inner tube 104 to the left. At this time, the heat exchange tube 103 is blocked by the elastic sealing component 5 at the right end of the heat exchange tube 103, and the entire heat exchange tube 103 is in a negative pressure state, causing the one-way valve 105 at the right end of the inserted inner tube 104 to be opened, so that the cold water in the cold water tank 3 is injected into the heat exchange tube 103.

[0036] The high-temperature gas from the coal grinding system is then fed into heat exchanger box 1 through intake channel 101. As it flows upward from the lower right corner, it fully contacts and exchanges heat with the cold water in heat exchange tubes 103. The heat-exchanged gas is then discharged through exhaust channel 102. Simultaneously, the water vapor in the high-temperature gas liquefies and falls due to gravity, where it is collected by condensate collection tank 2.

[0037] When the cold water in the heat exchange tube 103 is heated to the required temperature, the first telescopic drive member 6 is controlled to retract. At this time, the cold water tank 3 and the inserted inner tube 104 move to the right synchronously. When the inserted inner tube 104 moves to the right along the heat exchange tube 103, the hot water in the heat exchange tube 103 will be squeezed. The elastic sealing component 5 will be opened under the action of the hot water. At this time, all the hot water falls into the hot water tank 4 and can be delivered in time through the hot water discharge pipe 401.

[0038] Finally, the first telescopic driving member 6 is immediately controlled to extend, and the above process is repeated to inject new cold water into the heat exchange tube 103 for heat exchange.

[0039] Example 2

[0040] Example 2 discloses a high-temperature gas heat energy recovery device in a coal grinding system that is improved and designed based on Example 1. It mainly addresses the problem that impurities easily adhere to the outer surface of the heat exchange tube and scale, resulting in poor heat exchange effect of the heat exchange tube and even causing the heat exchange tube to break.

[0041] The similarities between Example 2 and Example 1 are not described again. Figure 6 and attached Figure 7 In this embodiment 2, a cleaning plate 7 that can move horizontally left and right is provided in the heat exchange box 1. A cleaning hole 701 corresponding to each heat exchange tube 103 is opened on the cleaning plate 7. The aperture ratio of the cleaning hole 701 is larger than the outer diameter of the heat exchange tube 103, so that when the cleaning plate 7 moves horizontally left and right, the cleaning hole 701 can scrape off impurities attached to the surface of the heat exchange tube 103.

[0042] In a specific configuration, a second telescopic drive member 8 is further provided on the right side of the heat exchanger box 1, and the movable end of the second telescopic drive member 8 extends into the heat exchanger box 1 and connects to the cleaning plate 7. A guide and limiting mechanism is also provided between the heat exchanger box 1 and the cleaning plate 7. This guide and limiting mechanism includes a guide rail 702 provided on the top wall of the heat exchanger box 1, and a guide rail slider 703 is provided at the upper end of the cleaning plate 7 to match the guide rail 702. This allows the entire cleaning plate 7 to move stably horizontally left and right under the action of the second telescopic drive member 8 and the guide and limiting mechanism.

[0043] Furthermore, an inclined sieve plate 9 is installed inside the condensate collection tank 2. This sieve plate 9 can scrape and clean the surface of the heat exchange tubes 103, separating the solid and liquid impurities from the discharged material. Furthermore, a removable impurity collection trough 10 is installed on the condensate collection tank 2 at the lower inclined end of the sieve plate 9. Operators can periodically remove the impurity collection trough 10 for cleaning.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-temperature gas heat energy recovery device in a coal grinding system, comprising a heat exchange box and a condensate collection box connected to each other, wherein the lower end of the heat exchange box is provided with an air intake channel, and the upper end is provided with an exhaust channel, characterized in that: A cold water tank and a hot water tank are respectively provided on two pairs of side surfaces of the heat exchange box; a heat exchange tube having one end extending into the hot water tank is fixedly provided in the heat exchange box; an inner tube is connected to the cold water tank and inserted into the heat exchange tube in a fitting manner; and a one-way valve is provided at the end of the inner tube facing the hot water tank; a first telescopic driving member connected to the cold water tank is provided on the heat exchange box, and the cold water tank moves away from or close to the heat exchange box under the action of the first telescopic driving member; and an elastic sealing component for blocking the end opening of the heat exchange tube is provided in the hot water tank; The elastic sealing assembly includes a fixed cylinder fixedly connected to the heat exchange box, a sealing piston is connected to the fixed cylinder through an elastic member, a connecting rod extending out of the fixed cylinder is connected to the sealing piston, and a sealing plug is provided at the end of the connecting rod to block the end opening of the heat exchange tube.

2. The high-temperature gas heat energy recovery device in the coal grinding system according to claim 1 is characterized in that: The heat exchange box is provided with a cleaning plate which moves along the axial direction of the heat exchange tube. The cleaning plate is provided with cleaning holes for scraping off impurities on the outer surface of the heat exchange tube.

3. The high-temperature gas heat energy recovery device in the coal grinding system according to claim 2, characterized in that: The heat exchange box is provided with a second telescopic driving member, and the movable end of the second telescopic driving member is connected to the cleaning plate.

4. The high-temperature gas heat energy recovery device in the coal grinding system according to claim 3 is characterized in that: A guide and limiting mechanism is provided between the heat exchange box and the cleaning plate. The guide and limiting mechanism comprises a guide rail provided on the top wall of the heat exchange box. A guide rail slider matching the guide rail is provided on the cleaning plate.

5. The high-temperature gas heat energy recovery device in a coal grinding system according to any one of claims 2 to 4, characterized in that: An inclined sieve plate is provided in the condensate collection box, and an impurity collection trough is provided on the condensate collection box at the lower inclined end of the sieve plate.

6. The high-temperature gas heat energy recovery device in the coal grinding system according to claim 1, characterized in that: The cold water tank is provided with a water injection pipe, and the hot water tank is connected with a hot water discharge pipe.

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