Heat exchanger for waste heat recovery of desulfurization slurry of coal-fired power plant

Abstract

The utility model discloses a heat exchanger for waste heat recovery of desulfurization slurry of a coal-fired power plant, which belongs to the technical field of heat exchange equipment and comprises a shell and a plate bundle, the plate bundle is formed by alternately arranging first plates and second plates from front to back, the first plates comprise main plates, and the second plates comprise second plates. The left side of the main plate piece is sequentially connected with a first bent plate section inclining towards the rear left side, a first parallel plate section extending parallel to the plate face, a second bent plate section extending towards the front left side and a second parallel plate section extending parallel to the plate face. According to the heat exchanger for recycling the waste heat of the desulfurization slurry of the coal-fired power plant, the plate bundle is formed by alternately arranging the first plates and the second plates from front to back, and the desulfurization slurry exchanges heat with cooling water in the downward flowing process in the second heat exchange cavity with the wide flow channel; and the circulating efficiency and the heat exchange efficiency of the desulfurization slurry can meet the working condition requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of heat exchangers for coal-fired power plant desulfurization slurry waste heat recovery, belong to heat exchange equipment technical field. BACKGROUND

[0002] Desulfurization slurry is formed in limestone wet desulfurization process, limestone slurry is sprayed into absorption tower to contact with flue gas to obtain desulfurization slurry during production. Sulfur dioxide in flue gas reacts with calcium hydroxide in limestone slurry to form gypsum, thereby removing sulfur dioxide from flue gas. During production, part of desulfurization slurry is drawn from the lower part of the absorption tower to serve as circulating slurry and is introduced into the absorption tower again to contact with flue gas. The circulating slurry needs to be cooled by heat exchange with cooling water outside the tower to reduce the temperature of the circulating slurry, improve the absorption rate of sulfur dioxide and reduce the exhaust gas temperature. The above process requires that the circulation efficiency and heat exchange efficiency of desulfurization slurry meet the requirements. However, the desulfurization slurry contains particulate matter. On the one hand, if the heat exchange channel is too narrow, it will affect the flow rate of the desulfurization slurry. On the other hand, if the flow direction of the desulfurization slurry is not reasonably designed, the particulate matter contained therein will deposit in the heat exchange channel, affecting the heat exchange efficiency. SUMMARY

[0003] The utility model discloses in order to solve the problems existing in prior art, provide a kind of heat exchanger for coal-fired power plant desulfurization slurry waste heat recovery, so that the flow efficiency and heat exchange efficiency of desulfurization slurry can reach the working condition requirement.

[0004] The utility model discloses the following technical scheme to realize the above-mentioned purpose:

[0005] A kind of heat exchanger for coal-fired power plant desulfurization slurry waste heat recovery, including shell and the sheet bundle being arranged in shell, the top and bottom of the shell are provided with first material guide cover and first discharge guide cover respectively, the upper portion and lower portion of the shell are provided with second material guide cover and second discharge guide cover respectively;

[0006] The sheet bundle is formed by first sheet and second sheet alternately arranged from front to back, the first sheet and the second sheet are left-right symmetrical structure, and the second sheet is symmetrically arranged before and after the first sheet;

[0007] The first sheet includes main sheet, the left side of the main sheet is sequentially connected with first bending sheet section that is inclined to left rear side, first parallel sheet section that is extended parallel to sheet face, second bending sheet section that is extended to left front side, and second parallel sheet section that is extended parallel to sheet face, and the distance D1 between the first parallel sheet section and the sheet face of main sheet is less than the distance D2 between the second parallel sheet section and the sheet face of main sheet;

[0008] The first heat exchange cavity is sealed between the rear plate surface of the adjacent first plate and the front plate surface of the second plate, and the second heat exchange cavity is sealed between the front plate surface of the adjacent first plate and the rear plate surface of the second plate.

[0009] The top and bottom of the second heat exchange cavity are sealed with blocking plates, and the top and bottom of the first heat exchange cavity are respectively communicated with a first feeding flow guide cover and a first discharging flow guide cover.

[0010] The second feeding port communicated with the second heat exchange cavity is arranged on the upper side of the first plate and the second plate, and the second discharging port communicated with the second heat exchange cavity is arranged on the lower side of the first plate and the second plate.

[0011] In one of the embodiments, the second feeding port and the second discharging port are respectively arranged on the left side and the right side of the main plate.

[0012] In one of the embodiments, the first parallel plate section of the first plate is sealingly connected with the first parallel plate section of the adjacent second plate, and the second parallel plate section of the first plate is sealingly connected with the second parallel plate section of the adjacent second plate.

[0013] Preferably, the first heat exchange cavity is used for flowing of cooling medium, and the second heat exchange cavity is used for flowing of desulfurization slurry.

[0014] The beneficial effects of the present application include but are not limited to:

[0015] The heat exchanger for recovering waste heat of desulfurization slurry in a coal-fired power plant provided by the present application is formed by alternately arranging first plates and second plates from front to back, and the desulfurization slurry flows downward in the second heat exchange cavity with a wider flow channel and exchanges heat with cooling water, so that the flow efficiency and heat exchange efficiency of the desulfurization slurry can meet the working condition requirements. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0017] Figure 1 The structure schematic view of the heat exchanger for recovering waste heat of desulfurization slurry in a coal-fired power plant provided by the present application is shown in the figure;

[0018] Figure 2 The structure schematic view of the heat exchanger for recovering waste heat of desulfurization slurry in a coal-fired power plant provided by the present application is shown in the figure; Figure 1 The structure schematic view of the heat exchanger for recovering waste heat of desulfurization slurry in a coal-fired power plant provided by the present application is shown in the figure;

[0019] Figure 3This is a top view of the plate bundle structure.

[0020] Figure 4 This is a schematic diagram of the structure of the first plate;

[0021] Figure 5 This is a schematic diagram of the second plate.

[0022] Figure 6 for Figure 3 Enlarged view of section A in the middle;

[0023] In the diagram, 100 is the outer shell; 200 is the plate bundle; 210 is the first plate; 211 is the main plate; 212 is the first bent plate segment; 213 is the first parallel plate segment; 214 is the second bent plate segment; 215 is the second parallel plate segment; 220 is the second plate; 310 is the first feed guide hood; 320 is the first discharge guide hood; 410 is the second feed guide hood; 420 is the second discharge guide hood; 510 is the first heat exchange chamber; 520 is the second heat exchange chamber; 521 is the sealing plate; and 522 is the second feed inlet. Detailed Implementation

[0024] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0025] It should be noted that many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0026] like Figures 1-6 As shown, the heat exchanger for waste heat recovery of desulfurization slurry in coal-fired power plants provided by this utility model includes a shell 100 and a plate bundle 200 disposed inside the shell 100. A first feed guide hood 310 and a first discharge guide hood 320 are respectively disposed at the top and bottom of the shell 100. A second feed guide hood 410 and a second discharge guide hood 420 are respectively disposed at the upper and lower parts of the shell 100.

[0027] The plate bundle 200 is formed by alternating front-to-back arrangement of the first plate 210 and the second plate 220. Both the first plate 210 and the second plate 220 are left-right symmetrical structures, and the second plate 220 is arranged symmetrically with the first plate 210.

[0028] Specifically, such as Figures 3-6As shown in the figure, the first plate 210 comprises a main plate 211, and the left side of the main plate 211 is sequentially connected with a first bending plate segment 212 which is inclined to the left rear side, a first parallel plate segment 213 which is parallel to the plate surface, a second bending plate segment 214 which is inclined to the left front side, and a second parallel plate segment 215 which is parallel to the plate surface. The distance D1 between the first parallel plate segment 213 and the plate surface of the main plate 211 is smaller than the distance D2 between the second parallel plate segment 215 and the plate surface of the main plate 211.

[0029] The rear plate surface of the adjacent first plate 210 and the front plate surface of the second plate 220 are sealed to form a first heat exchange cavity 510, and the front plate surface of the adjacent first plate 210 and the rear plate surface of the second plate 220 are sealed to form a second heat exchange cavity 520.

[0030] As shown in the figure, the top and bottom of the second heat exchange cavity 520 are sealed with a blocking plate 521, and the top and bottom of the first heat exchange cavity 510 are respectively connected with the first feeding flow guide cover 310 and the first discharging flow guide cover 320. Figure 2

[0031] The second bending plate segment 214 on one side of the upper part of the first plate 210 and the second plate 220 is provided with a second feeding port 522 which is connected with the second heat exchange cavity 520, and the second bending plate segment 214 on one side of the lower part of the first plate 210 and the second plate 220 is provided with a second discharging port which is connected with the second heat exchange cavity 520. The second feeding port 522 is connected with the second feeding flow guide cover 410, and the second discharging port is connected with the second discharging flow guide cover 420.

[0032] Figure 3 The number of the first plate and the second plate shown in the figure is only for illustration, and the number of plates required in actual application can be determined according to the heat exchange amount.

[0033] During production, the cooling water as the cooling medium enters the first feeding flow guide cover 310 and is then distributed into each first heat exchange cavity 510. The desulfurization slurry enters the second feeding flow guide cover 410 and then enters the second heat exchange cavity 520 through each second feeding port 522.

[0034] The cooling water and the desulfurization slurry exchange heat during the process of flowing in the first heat exchange cavities 510 and the second heat exchange cavities 520 which are arranged at intervals, and the temperature of the desulfurization slurry is reduced.

[0035] Finally, the cooling water enters the first discharging flow guide cover 320 from the bottom of the first heat exchange cavity 510 and is then discharged from the first discharging flow guide cover 320; and the desulfurization slurry enters the second discharging flow guide cover 420 from the bottom of the second heat exchange cavity 520 and is then discharged from the second discharging flow guide cover 420, so as to complete the heat exchange process.

[0036] ​In the above process, the desulfurization slurry flows downward in the second heat exchange cavity with a wide flow channel, and exchanges heat with the cooling water, so that the flow efficiency and heat exchange efficiency of the desulfurization slurry can meet the working condition requirements.

[0037] In the preferred embodiment, the second feeding port 522 and the second discharging port are respectively located on the left side and the right side of the main plate 211.

[0038] Generally, the first parallel plate section 213 of the first plate 210 is sealingly connected with the first parallel plate section 213 of the adjacent second plate 220, and the second parallel plate section 215 of the first plate 210 is sealingly connected with the second parallel plate section 215 of the adjacent second plate 220, which can be fixed by welding.

[0039] Generally, the first feeding guide cover 310, the first discharging guide cover 320, the second feeding guide cover 410 and the second discharging guide cover 420 are respectively connected with a material guide pipe.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection", "fixation" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0042] The details not described in the present application are the known technology of those skilled in the art.

Claims

1. A heat exchanger for flue gas desulfurization slurry waste heat recovery in a coal-fired power plant, characterized in that, The shell is provided with a first feeding fairing and a first discharging fairing at the top and bottom thereof respectively, and a second feeding fairing and a second discharging fairing at the upper and lower portions thereof respectively; The plate bundle is formed by alternately arranging first plates and second plates from front to back, the first plates and the second plates are both left-right symmetrical structures, and the second plates are arranged in front of and behind the first plates symmetrically; The first plate comprises a main plate, the left side of the main plate is sequentially connected with a first bent plate segment inclined to the left rear side, a first parallel plate segment extending parallel to the plate surface, a second bent plate segment extending to the left front side, and a second parallel plate segment extending parallel to the plate surface, the distance D1 between the first parallel plate segment and the plate surface of the main plate is smaller than the distance D2 between the second parallel plate segment and the plate surface of the main plate; The rear plate surface of the adjacent first plate and the front plate surface of the second plate are sealed to form a first heat exchange cavity, and the front plate surface of the adjacent first plate and the rear plate surface of the second plate are sealed to form a second heat exchange cavity; The top and bottom of the second heat exchange cavity are both sealed with a blocking plate, and the top and bottom of the first heat exchange cavity are respectively communicated with the first feeding fairing and the first discharging fairing; The second bent plate segment on one side of the upper portion of the first plate and the second bent plate segment on one side of the upper portion of the second plate are both provided with a second feeding port communicated with the second heat exchange cavity, and the second bent plate segment on one side of the lower portion of the first plate and the second bent plate segment on one side of the lower portion of the second plate are both provided with a second discharging port communicated with the second heat exchange cavity, the second feeding port is communicated with the second feeding fairing, and the second discharging port is communicated with the second discharging fairing.

2. The heat exchanger for flue dust slurry waste heat recovery of coal-fired power plants according to claim 1, characterized in that, The second feeding port and the second discharging port are respectively located on the left side and the right side of the main plate.

3. The heat exchanger for flue dust slurry waste heat recovery of coal-fired power plants according to claim 1, characterized in that, The first parallel plate segment of the first plate and the first parallel plate segment of the adjacent second plate are sealingly connected, and the second parallel plate segment of the first plate and the second parallel plate segment of the adjacent second plate are sealingly connected.

4. The heat exchanger for flue dust slurry waste heat recovery of coal-fired power plants according to claim 1, characterized in that, The first heat exchange cavity is used for flowing cooling medium, and the second heat exchange cavity is used for flowing desulfurization slurry.

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