A dust-laden, hot exhaust gas scrubbing heat recovery column and method

Abstract

This invention discloses a dust- and heat-containing waste gas scrubbing and heat recovery tower and method, comprising a tower body, an air inlet located at the lower part of the tower body, a first spray device and a second spray device located inside the tower body for spraying the waste gas entering the tower body, an upper cover located at the upper end of the tower body with an exhaust port, a lower cover located at the lower end of the tower body with a drain port, and a support located at the lower end of the tower body. It also includes an air distribution plate and an angled box distributor located inside the tower body, and three heat exchange components located at the top of the tower body for exchanging heat with the waste gas. The dust- and heat-containing waste gas scrubbing and heat recovery tower and method of this invention integrates dust removal, treatment of odor from dust- and heat-containing waste gas, and heat energy recovery and reuse functions. It fully recovers heat from the waste gas, achieves water recycling, saves energy, and controls environmental pollution. It extends the upward path of the waste gas within the tower body, allowing the waste gas to fully contact the water mist, ensuring the effectiveness of dust removal and heat energy recovery.

Description

Technical Field

[0001] This invention relates to the field of waste gas recovery tower technology, and in particular to a washing heat recovery tower developed for the problem of dust- and heat-containing waste gas discharged from conditioning towers, cooling boxes and desiccant machines in grain and oil processing plants. Background Technology

[0002] For the dust-laden and heat-containing waste gas emitted from the conditioning tower, cooling box, and steam separator of grain and oil processing plants, a recovery tower is needed to remove dust and exchange heat from the discharged waste gas. Existing recovery towers use spray devices to remove dust and heat-containing waste gas with water mist, but they cannot recover and reuse the heat energy from the heat exchange, nor can they recycle the heat exchange water, which limits the recovery tower's function of recovering dust and heat-containing waste gas. In addition, when the spray device removes dust from the waste gas in the tower with water mist, the uneven distribution of the waste gas or the excessively fast rising speed of the waste gas often prevents the sprayed water mist from making sufficient contact with the waste gas, resulting in poor dust removal and heat recovery effects. Summary of the Invention

[0003] The main objective of this invention is to provide a heat recovery tower for washing dusty and hot waste gas, which can effectively solve the problems of limited recovery function and poor recovery effect of recovery towers.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A heat recovery tower for scrubbing dusty and hot waste gas includes a tower body, an air inlet located at the bottom of the tower body, a first spray device and a second spray device located inside the tower body for spraying the waste gas entering the tower body, an upper cover located at the top of the tower body with an exhaust port, a lower cover located at the bottom of the tower body with a drain port, and a support at the bottom of the tower body. It also includes an air distribution plate and an angled box distributor located inside the tower body, three heat exchangers located at the top of the tower body for exchanging heat with the waste gas, and a third spray device located at the top of the tower body for spraying the discharged waste gas.

[0006] The heat exchanger is provided with a second water outlet that communicates with the external heat-requiring equipment. The lower cover is provided with a fresh water inlet for adding clean water into the lower cover and a first water outlet for discharging the clean water after heat exchange to the external heat-requiring equipment. The lower part of the tower body is also provided with a circulating water inlet for adding circulating clean water into the lower cover. The corner box distributor includes several corner distribution components that are staggered vertically. Both the air distribution plate and the corner box distributor are multi-layered structures with vertical distribution. The air distribution plate is located between the air inlet and the first spray device, and the corner box distributor is located between the first spray device and the second spray device.

[0007] The angular distribution component includes an inverted V-shaped angle plate, several diversion strips on the outer surface of the V-shaped angle plate, several guide grooves formed by the V-shaped angle plate and the several diversion strips, and wall panels on both sides of the lower end of the V-shaped angle plate.

[0008] As a further optimization of the present invention, the tower body is provided with a plurality of maintenance manholes, which are respectively located between the corner box distributor and the second spray device, between the air distribution plate and the first spray device, and between the air distribution plate and the lower cover, so as to facilitate maintenance of the interior of the tower body.

[0009] As a further optimization of the present invention, the tower body is also provided with an overflow port, which is located between the lower cover and the gas distribution plate to prevent water from overflowing and affecting the normal operation of the recovery tower.

[0010] As a further optimization of the present invention, the thickness of the V-shaped corner plate gradually increases from the middle to the edge, which facilitates the dispersion of exhaust gas.

[0011] As a further optimization of the present invention, the air distribution plate has a plurality of air distribution holes, and all the air distribution holes are circular holes, so as to achieve uniform air distribution of exhaust gas.

[0012] As a further optimization of the present invention, the heat exchanger includes a central column located at the top of the tower and horizontally distributed, a spiral coil wound around the outer surface of the central column, a finned heat exchanger sleeved on the spiral coil, and a second water inlet communicating with the inside of the spiral coil, for recovering heat energy from the waste gas.

[0013] As a further optimization of the present invention, both the second spraying device and the first spraying device include a conduit disposed in the tower body, a plurality of nozzles disposed at the lower end of the conduit, and a first water inlet disposed at one end of the conduit, for water mist dust removal of the exhaust gas.

[0014] As a further optimization of the present invention, the nozzle is a spiral nozzle.

[0015] As a further optimization of the present invention, the third spraying device includes spray pipes arranged horizontally above the heat exchanger, with a plurality of spray nozzles at the lower end of the spray pipes, and a spray inlet extending to the outside of the tower body at one end of the spray pipes.

[0016] A method for recovering heat energy from dust-laden and heat-containing waste gas by using the above-mentioned recovery tower includes the following steps:

[0017] Step S1: The dust-laden and heat-laden waste gas emitted from the conditioning tower, cooling box, and steam degasser of the grain and oil processing plant is introduced into the tower body through the air inlet. The first spray device inside the tower is turned on, and the air distribution plate evenly distributes the waste gas. The waste gas is washed once after the air distribution is completed.

[0018] Step S2: The second spray device is turned on. The angular distribution parts, which are staggered vertically and have several diversion strips on the top, divert the water and then perform secondary washing, dust collection and heat exchange operations with the exhaust gas.

[0019] Step S3: The exhaust gas after secondary washing exchanges heat with the heat exchanger. The finned heat exchanger absorbs the heat energy of the exhaust gas at the top. After the exhaust gas at the top is heated, it undergoes three washing, dust collection and heat exchange operations by the third spray device before being discharged from the exhaust port.

[0020] Step S4: The water washed in steps S1 and S2 is filtered and then exchanged with the clean water introduced into the new water inlet. In step S3, water is introduced into the finned heat exchanger and the spiral coil for heat exchange. After the heat exchange and heating, the clean water and the water in the spiral coil are introduced into the external heat-requiring equipment to recover heat energy.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In this invention, by setting up a first spray device, a second spray device, a third spray device, a heat exchanger, a fresh water inlet, a first water outlet, and a circulating water inlet, the odor generated by organic matter in the waste gas can be removed. This makes the recovery tower integrate the functions of dust removal, treatment of dust- and heat-containing waste gas odor, and heat energy recovery and reuse. It fully recovers the heat in the waste gas, realizes the recycling of clean water, saves energy, and treats environmental pollution at the same time.

[0023] 2. In this invention, by setting an air distribution plate between the air inlet and the first spraying device, and setting several staggered angular distribution components between the first spraying device and the second spraying device, the exhaust gas is pre-distributed evenly, and during the rise of the exhaust gas, the rising path of the exhaust gas in the tower body is extended, so that the exhaust gas can fully contact the water mist sprayed from the nozzle; and several diversion strips and guide grooves set on the V-shaped corner plate realize the diversion and guidance of the water body. The thickness of the V-shaped corner plate gradually decreases from the middle to the edge, which facilitates the dispersion of exhaust gas, realizes further heat exchange and dust removal between exhaust gas and water body, and ensures the effect of exhaust gas dust removal and heat energy recovery. Attached Figure Description

[0024] Figure 1 This is an overall structural diagram of a dust- and heat-containing waste gas scrubbing and heat recovery tower according to the present invention;

[0025] Figure 2 This is a schematic diagram of the angled box distributor of a dust- and heat-containing waste gas scrubbing and heat recovery tower according to the present invention;

[0026] Figure 3 This is a front view of the corner distribution component of a dust- and heat-containing waste gas scrubbing and heat recovery tower according to the present invention;

[0027] Figure 4This is a schematic diagram of the corner-shaped distribution component of a dust- and heat-containing waste gas scrubbing and heat recovery tower according to the present invention;

[0028] Figure 5 This is a side sectional view of the V-shaped corner plate of a dust- and heat-containing waste gas scrubbing and heat recovery tower according to the present invention.

[0029] Figure 6 This is a partial structural schematic diagram of the air distribution plate of a heat recovery tower for washing dusty and hot waste gas according to the present invention.

[0030] Figure 7 This invention relates to a heat recovery tower for scrubbing dust- and heat-containing waste gas. Figure 1 Enlarged view of point A in the image;

[0031] Figure 8 This is a schematic diagram of the second spray device of a heat recovery tower for washing dusty and hot waste gas according to the present invention;

[0032] Figure 9 This is a schematic diagram of the third spray device of a heat recovery tower for washing dusty and hot waste gas according to the present invention.

[0033] In the diagram: 1. Tower body; 2. Air inlet; 3. Air distribution plate; 4. First spray device; 5. Corner box distributor; 6. Second spray device; 7. Heat exchanger; 8. Upper cover; 9. Exhaust port; 10. Circulating water inlet; 11. Overflow port; 12. Lower cover; 13. Support frame; 14. Fresh water inlet; 15. First water outlet; 16. Manhole; 17. Drainage outlet; 18. Second water outlet; 19. 1. Third spray device; 31. Air distribution hole; 51. Angle-shaped distribution piece; 191. Spray inlet; 192. Spray pipe; 193. Spray nozzle; 511. V-shaped angle plate; 512. Diverter strip; 513. Wall panel; 514. Guide groove; 61. Spray head; 62. Guide tube; 63. First inlet; 71. Spiral coil; 72. Finned heat exchanger; 73. Second inlet; 74. Central column. Detailed Implementation

[0034] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0035] Example 1

[0036] like Figures 1-5As shown, a dust- and heat-containing waste gas scrubbing and heat recovery tower includes a tower body 1, an air inlet 2 located at the lower part of the tower body 1, a first spray device 4 and a second spray device 6 located inside the tower body 1 for spraying the waste gas entering the tower body 1, an upper cover 8 located at the upper end of the tower body 1 and having an exhaust port 9, a lower cover 12 located at the lower end of the tower body 1 and having a drain port 17, and a support 13 located at the lower end of the tower body 1. It also includes an air distribution plate 3 and an angled box distributor 5 located inside the tower body 1, three heat exchange components 7 located at the top of the tower body 1 for exchanging heat with the waste gas, and a third spray device 19 located at the top of the tower body 1 for spraying the discharged waste gas.

[0037] Among them, the heat exchanger 7 is provided with a second water outlet 18 that communicates with the external heat-requiring equipment, the lower cover 12 is provided with a new water supply port 14 for adding clean water into the lower cover 12 and a first water outlet 15 for discharging the clean water after heat exchange to the external heat-requiring equipment, the lower part of the tower body 1 is also provided with a circulating water supply port 10 for adding circulating clean water into the lower cover 12, the corner box distributor 5 includes a number of corner distribution components 51 that are staggered vertically, the air distribution plate 3 and the corner box distributor 5 are both multi-layer structures that are vertically distributed, the air distribution plate 3 is located between the air inlet 2 and the first spray device 4, and the corner box distributor 5 is located between the first spray device 4 and the second spray device 6;

[0038] The angular distribution component 51 includes an inverted V-shaped angle plate 511, several diversion strips 512 disposed on the outer surface of the V-shaped angle plate 511, several guide grooves 514 formed by the V-shaped angle plate 511 and the several diversion strips 512, and wall panels 513 disposed on both sides of the lower end of the V-shaped angle plate 511. The upper end face of the several diversion strips 512 is an inverted V-shaped structure, which diverts and guides the water body for heat exchange and dust removal, avoiding concentrated contact between the water body and the exhaust gas, which would result in poor heat exchange and dust removal effect.

[0039] like Figure 1 and Figure 6 As shown, the tower body 1 is provided with several maintenance manholes 16, which are respectively located between the corner box distributor 5 and the second spray device 6, between the air distribution plate 3 and the first spray device 4, and between the air distribution plate 3 and the lower cover 12; the tower body 1 is also provided with an overflow port 11, which is located between the lower cover 12 and the air distribution plate 3; the corner distribution components 51 are all inverted V-shaped structures; the air distribution plate 3 has several air distribution holes 31, which are all round holes. The thickness of the V-shaped corner plate 511 gradually increases from the middle to the edge, which can facilitate the dispersion of exhaust gas. The arrangement of several air distribution holes 31 on the air distribution plate 3 can achieve uniform distribution of exhaust gas, ensure sufficient contact between exhaust gas and spray water, and facilitate thorough scrubbing of exhaust gas.

[0040] like Figure 1 and Figure 7As shown, the heat exchanger 7 includes a central column 74 located at the top of the tower body 1 and horizontally distributed, a spiral coil 71 wound around the outer surface of the central column 74, a finned heat exchanger 72 sleeved on the spiral coil 71, and a second water inlet 73 communicating with the inside of the spiral coil 71. The finned heat exchanger 72, which is heated by heat exchange, performs heat exchange through the water introduced into the spiral coil 71. The water heated by heat exchange in the spiral coil 71 is introduced into the external heat-requiring equipment through the second water outlet 18 to realize heat energy recovery.

[0041] like Figure 1 , Figure 8 and Figure 9 As shown, both the second spray device 6 and the first spray device 4 include a conduit 62 located inside the tower body 1, a plurality of nozzles 61 located at the lower end of the conduit 62, and a first water inlet 63 located at one end of the conduit 62. The nozzles 61 are spiral nozzles. The spiral nozzles can increase the spray angle and minimize liquid blockage, thereby achieving thorough scrubbing of the exhaust gas. The third spray device 19 includes a spray pipe 192 located above the heat exchanger 7 and horizontally distributed. The lower end of the spray pipe 192 has a plurality of spray ports 193, and one end of the spray pipe 192 has a spray water inlet 191 extending to the outside of the tower body 1.

[0042] A method for recovering heat energy from dust-laden and heat-containing waste gas by using the above-mentioned recovery tower includes the following steps:

[0043] Step S1: The dust-laden and heat-laden exhaust gas emitted from the conditioning tower, cooling box, and steam degasser of the grain and oil processing plant is introduced into the tower body 1 through the air inlet 2. The first spray device 4 inside the tower body 1 is turned on, and the air distribution plate 3 evenly distributes the exhaust gas. The exhaust gas after the air distribution is completed is washed once.

[0044] Step S2: The second spray device 6 is turned on. The angular distribution piece 51, which is staggered and has several diversion strips 512 on the top, diverts the water and performs secondary washing, dust collection and heat exchange with the exhaust gas.

[0045] Step S3: The exhaust gas after secondary washing exchanges heat with the heat exchanger 7. The finned heat exchanger 72 absorbs the heat energy of the exhaust gas at the top. After the exhaust gas at the top is heated, it undergoes three washing, dust collection and heat exchange operations through the third spray device 19 and is then discharged from the exhaust port 9.

[0046] In step S4, the water washed in steps S1 and S2 is filtered and then exchanged with the clean water introduced into the new water inlet 14. In step S3, water is introduced into the finned heat exchanger 72 and the spiral coil 71 for heat exchange. After the heat exchange and heating, the clean water and the water in the spiral coil 71 are introduced into the external heat-requiring equipment to recover heat energy.

[0047] It should be noted that this invention is a heat recovery tower for washing dusty and hot waste gas. When it is necessary to treat dusty and hot waste gas emitted from the conditioning tower, cooling box, and steam degasser of a grain and oil processing plant, the dusty and hot waste gas is first introduced into the tower body 1 through the air inlet 2. The first spray device 4 and the second spray device 6 inside the tower body 1 perform spraying operations. The air distribution plate 3 below the first spray device 4 can perform pre-distribution of the waste gas. Several angular distribution pieces 51 on the angular box distributor 5 are staggered vertically, extending the upward path of the waste gas in the tower body 1. The waste gas rises layer by layer through the gaps on the angular box distributor 5. During the ascent, the waste gas and the water mist sprayed from the nozzles 61 come into full contact. The dust particles in the waste gas absorb water and fall down. At the same time, heat energy is exchanged between the waste gas and water. The water absorbs heat and heats up, while the waste gas releases heat and cools down. In addition, the organic matter in the waste gas is also dissolved into the water through the spraying of water mist, promoting the production of organic matter in the waste gas. Odor removal ensures that the emitted gas meets emission requirements. The exhaust gas treated by spraying exchanges heat with the heat exchanger 7 at the top of the tower body 1. The finned heat exchanger 72 absorbs the heat energy of the exhaust gas at the top. After heat exchange, the exhaust gas undergoes three washing, dust removal, and heat exchange operations through the third spray device 19 before being discharged from the exhaust port 9. The heated finned heat exchanger 72 exchanges heat with water flowing into the spiral coil 71. The heated water in the spiral coil 71 is then introduced into external heat-requiring equipment through the second water outlet 18. The lower cover 12 is equipped with a filter. Water sprayed from the nozzle 61 absorbs heat and, after filtration, exchanges heat with clean water flowing into the fresh water inlet 14. The clean water is discharged from the first water outlet 15 and sent to external heat-requiring equipment such as a hot air heater to release heat. Then, it is reintroduced into the tower body 1 through the circulating water inlet 10 for circulating heat exchange, thereby saving water resources and achieving full recovery and utilization of heat energy.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A dust-laden hot exhaust gas scrubbing heat recovery method employing a dust-laden hot exhaust gas scrubbing heat recovery column, characterized by: The dust-laden and heat-containing waste gas scrubbing heat recovery tower includes a tower body (1), an air inlet (2) located at the bottom of the tower body (1), a first spray device (4) and a second spray device (6) located inside the tower body (1) for spraying the waste gas entering the tower body (1), an upper cover (8) located at the top of the tower body (1) and having an exhaust port (9), a lower cover (12) located at the bottom of the tower body (1) and having a drain port (17), and a support (13) located at the bottom of the tower body (1). It also includes an air distribution plate (3) and an angled box distributor (5) located inside the tower body (1), three heat exchange components (7) located at the top of the tower body (1) for exchanging heat with the waste gas, and a third spray device (19) located at the top of the tower body (1) for spraying the discharged waste gas. The heat exchanger (7) is provided with a second water outlet (18) that communicates with the external heat-requiring equipment. The lower cover (12) is provided with a new water supply port (14) for adding clean water into the lower cover (12) and a first water outlet (15) for discharging the clean water after heat exchange to the external heat-requiring equipment. The lower part of the tower body (1) is also provided with a circulating water supply port (10) for adding circulating clean water into the lower cover (12). The corner box distributor (5) includes several corner distribution pieces (51) that are staggered vertically. The air distribution plate (3) and the corner box distributor (5) are both multi-layer structures that are vertically distributed. The air distribution plate (3) is located between the air inlet (2) and the first spray device (4). The corner box distributor (5) is located between the first spray device (4) and the second spray device (6). The angular distribution component (51) includes an inverted V-shaped angle plate (511), a plurality of diversion strips (512) disposed on the outer surface of the V-shaped angle plate (511), a plurality of guide grooves (514) formed by the V-shaped angle plate (511) and the plurality of diversion strips (512), and wall panels (513) disposed on both sides of the lower end of the V-shaped angle plate (511). The heat exchanger (7) includes a central column (74) located at the top of the tower body (1) and horizontally distributed, a spiral coil (71) wound around the outer surface of the central column (74), a finned heat exchanger (72) sleeved on the spiral coil (71), and a second water inlet (73) communicating with the inside of the spiral coil (71). The method includes the following steps: Step S1: The dust-laden and heat-laden exhaust gas emitted from the conditioning tower, cooling box, and steam degasser of the grain and oil processing plant is introduced into the tower body (1) through the air inlet (2). The first spray device (4) inside the tower body (1) is turned on, and the air distribution plate (3) evenly distributes the exhaust gas. The exhaust gas after the air distribution is completed is washed once. Step S2: The second spray device (6) is turned on. The angular distribution piece (51) with several diversion strips (512) on the top is staggered and diverts the water body to perform secondary washing, dust collection and heat exchange with the exhaust gas. Step S3: The exhaust gas after secondary washing exchanges heat with the heat exchanger (7). The finned heat exchanger (72) absorbs the heat energy of the exhaust gas at the top. After the exhaust gas at the top exchanges heat, it undergoes three washing, dust collection and heat exchange operations through the third spray device (19) and is then discharged from the exhaust port (9). Step S4: The water washed in steps S1 and S2 is filtered and then exchanged with the clean water introduced into the new water inlet (14) for heat exchange. In step S3, water is introduced into the finned heat exchanger (72) and the spiral coil (71) for heat exchange and heating. After heat exchange and heating, the clean water and the water in the spiral coil (71) are introduced into the external heat-requiring equipment to recover heat energy.

2. A dust-laden hot exhaust gas scrubbing heat recovery method employing a dust-laden hot exhaust gas scrubbing heat recovery tower according to claim 1, characterized by: The tower body (1) is provided with a number of maintenance manholes (16), and the maintenance manholes (16) are respectively located between the corner box distributor (5) and the second spray device (6), between the air distribution plate (3) and the first spray device (4), and between the air distribution plate (3) and the lower cover (12).

3. A dust-laden hot exhaust gas scrubbing heat recovery method employing a dust-laden hot exhaust gas scrubbing heat recovery tower according to claim 1, characterized by: The tower body (1) is also provided with an overflow port (11), which is located between the lower cover (12) and the air distribution plate (3).

4. A dust-laden hot exhaust gas scrubbing heat recovery method employing a dust-laden hot exhaust gas scrubbing heat recovery tower according to claim 1, characterized by: The thickness of the V-shaped corner plate (511) gradually increases from the middle to the edge.

5. The method for recovering heat energy from dust-laden and heat-laden waste gas using a dust-laden and heat-laden waste gas scrubbing heat recovery tower according to claim 1, characterized in that: The air distribution plate (3) has several air distribution holes (31), and all the air distribution holes (31) are circular holes.

6. The method for recovering heat energy from dust-laden and heat-laden waste gas using a dust-laden and heat-laden waste gas scrubbing heat recovery tower according to claim 1, characterized in that: The second spray device (6) and the first spray device (4) both include a conduit (62) installed in the tower body (1), a number of nozzles (61) installed at the lower end of the conduit (62), and a first water inlet (63) installed at one end of the conduit (62).

7. The method for recovering heat energy from dust-laden and heat-laden waste gas using a dust-laden and heat-laden waste gas scrubbing heat recovery tower according to claim 6, characterized in that: The nozzle (61) is a spiral nozzle.

8. The method for recovering heat energy from dust-laden and heat-laden waste gas using a dust-laden and heat-laden waste gas scrubbing heat recovery tower according to claim 1, characterized in that: The third spray device (19) includes a spray pipe (192) located above the heat exchanger (7) and distributed horizontally. The lower end of the spray pipe (192) has several spray ports (193), and one end of the spray pipe (192) has a spray inlet (191) extending to the outside of the tower body (1).

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