Heat exchange and phase change dust removal combined device for converter flue gas

Abstract

The utility model discloses a heat exchange and phase change dust removal combined device for converter flue gas, and belongs to the technical field of waste heat recovery. The device comprises a dust removal tower, a silk screen filtering assembly arranged at the upper end in the dust removal tower and a heat exchange assembly arranged at the lower end in the dust removal tower, a flue gas outlet is formed in the top end of the dust removal tower, a flue gas inlet is formed in the bottom end of the dust removal tower, and mounting supports are fixedly connected to the upper end and the lower end of the outer side of the dust removal tower; the silk screen filtering assembly comprises a silk screen body, a fixing plate is fixedly connected to the outer side of the silk screen body, and a fastening bolt is arranged on the fixing plate; the heat exchange assembly comprises a metal circular ring plate and a plurality of pipe network fixing rings, a heat exchange pipe network is arranged on the inner side of each pipe network fixing ring, two inserting strips are symmetrically and fixedly connected to the outer side of each pipe network fixing ring, a plurality of sets of inserting grooves are evenly formed in the inner side of the metal circular ring plate, and each layer of heat exchange pipe network comprises a plurality of heat exchange pipes which are distributed in a staggered mode. And each heat exchange tube is filled with a phase change layer.

Description

TECHNICAL FIELD

[0001] The utility model relates to dust removal equipment technical field, especially a kind of heat exchange phase change dust removal combination device for converter flue gas. BACKGROUND

[0002] Converter flue gas contains a large number of fine particles difficult to remove, such as PM less than 10 microns of fine particles. The existing technology such as wet dust removal, bag dust removal etc. most of dust removal technology is difficult to remove such small material, more advanced dry electric dust removal and sound wave agglomeration technology cannot stably handle fine particles.

[0003] Steam phase change technology: in supersaturated steam environment, steam occurs phase change with fine particles as condensation nucleus, particle size increases, and coalescence phenomenon occurs between particles, so that fine particle size and mass are significantly increased. But steam phase change technology is higher for temperature and steam saturation, and it is not easy to nucleate when reaching appropriate temperature and saturation, so that the dust removal effect is greatly reduced.

[0004] In order to solve the above problems, through retrieval, a converter flue gas phase change demisting device and its operation method (publication number: CN 113318577A, authorized announcement date: 2021.08.31) is provided, which includes a shell, the shell has a flue gas inlet, a flue gas outlet and a liquid discharge port; a phase change dehydration layer is arranged on the flue gas flow path between the flue gas inlet and the flue gas outlet in the shell, the phase change dehydration layer is a packed bed filled with a plurality of phase change beads, the phase change beads include a spherical shell and a composite phase change material filled in the spherical shell; a spraying device is arranged above the phase change dehydration layer; a demister is arranged near the flue gas outlet in the shell. When the dust removal tower operates, the phase change dehydration layer is sprayed and cooled in cooperation with the converter steelmaking smoke exhaust cycle. The device is relatively strict for the temperature of flue gas. If the temperature of the flue gas is too high, not only the dust removal effect is reduced, but also the device material and equipment aging is accelerated, the service life is affected, and the phase change beads are difficult to prepare and have high cost and are not easy to replace. UTILITY MODEL CONTENT

[0005] 1. Problem to be solved

[0006] The main purpose of the utility model is to provide a heat exchange phase change dust removal combination device for converter flue gas, which can effectively solve the problems in the background art.

[0007] 2. Technical scheme

[0008] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0009] The utility model discloses a heat exchange phase change dust removal combined device for converter flue gas, including dust removal tower, the wire mesh filtering component of setting in the upper end of dust removal tower inside and the heat exchange component of lower extreme of dust removal tower inside, the flue gas outlet is provided with at the top of dust removal tower, the flue gas import is provided with at the bottom of dust removal tower, the upper end and the lower extreme of dust removal tower outside are all fixedly connected with the mounting bracket.

[0010] The wire mesh filtering component includes a wire mesh body, a fixed plate is fixedly connected to the outside of the wire mesh body, and a fastening bolt is arranged on the fixed plate.

[0011] The heat exchange component includes a metal circular plate and a plurality of pipe network fixing rings, a heat exchange pipe network is arranged on the inside of each pipe network fixing ring, two plug-in strips are symmetrically and fixedly connected to the outside of the pipe network fixing ring, a plurality of insertion grooves are uniformly formed in the inside of the metal circular plate, each layer of the heat exchange pipe network includes a plurality of heat exchange pipes which are distributed in a staggered manner, and a phase change layer is filled in the inside of each heat exchange pipe.

[0012] As further description of the above technical solution, a water pipe is arranged above the wire mesh filtering component, and a plurality of spray heads are uniformly and fixedly installed at the bottom end of the water pipe.

[0013] As further description of the above technical solution, the wire mesh body is a particle gas filter screen, and the fixed plate is fixedly installed on the inner wall of the dust removal tower through the fastening bolt.

[0014] As further description of the above technical solution, the metal circular plate is fixedly installed on the outer wall of the dust removal tower, the heat exchange pipes in each layer of the heat exchange pipe network are fixedly connected with the pipe network fixing ring and penetrate through the side wall of the dust removal tower, the number of each group of insertion grooves is two, the insertion grooves are symmetrically distributed, and the groove depths are the same.

[0015] As further description of the above technical solution, the water pipe is fixedly installed on the inner wall of the dust removal tower in an S-curve shape, and one end of the water pipe penetrates through the side wall of the dust removal tower and is fixedly connected with the water outlet of an external water pump in a communication mode.

[0016] 3. Advantageous effects

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] (1) The heat exchange phase change dust removal combined device for converter flue gas can effectively cool the flue gas in the dust removal tower under the action of the heat exchange component, so that the temperature in the flue gas is reduced to the condensation degree of the water vapor in the flue gas, the fine particulate matters in the flue gas are vapor phase changed and agglomerated to grow, then fall on the wall surface of the heat exchange pipe and are blocked by the filter screen, the dust removal effect of the flue gas is effectively improved, the flue gas with reduced temperature is not easy to accelerate the aging of the filter screen, and the service life of the filter screen is prolonged.

[0019] (2) The heat exchange phase change dust removal combined device for converter flue gas of the utility model, through setting up water pipe, spray head, further effectively cooling the flue gas through the dust removal tower, make the temperature in the flue gas drop to the degree of water vapor condensation in the flue gas at a faster speed;

[0020] (3) The heat exchange phase change dust removal combined device for converter flue gas of the utility model, through setting up dust removal tower and heat exchange assembly cooperation, can assemble different layers of pipe heat pipe network according to actual dust removal demand, so as to meet the heat exchange cooling of different temperature flue gas, more flexible, higher applicability. At the same time, the existence of heat exchange assembly makes the flue gas with higher temperature can also be removed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is whole internal structure schematic diagram of the heat exchange phase change dust removal combined device for converter flue gas of the utility model;

[0022] Figure 2 It is working flow structure schematic diagram of the heat exchange phase change dust removal combined device for converter flue gas of the utility model;

[0023] Figure 3 It is silk screen filter assembly structure schematic diagram of the heat exchange phase change dust removal combined device for converter flue gas of the utility model;

[0024] Figure 4 It is heat exchange assembly structure explosion view of the heat exchange phase change dust removal combined device for converter flue gas of the utility model;

[0025] Figure 5 It is heat exchange assembly structure sectional view of the heat exchange phase change dust removal combined device for converter flue gas of the utility model.

[0026] Marking in the drawing is explained:

[0027] 1, dust removal tower;

[0028] 2, flue gas outlet;

[0029] 3, flue gas inlet;

[0030] 4, silk screen filter assembly;41, silk screen body;42, fixed plate;43, fastening bolt;

[0031] 5, water pipe;

[0032] 6, spray head;

[0033] 7, heat exchange assembly;71, metal round ring plate;72, pipe network fixing ring;73, heat exchange pipe network;74, insertion strip;75, insertion slot;

[0034] 8, mounting bracket. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, and achieved purposes of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0036] In the description of the utility model, it should be pointed out that the directions or position relationships indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. The terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the utility model, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled persons in the art, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0038] In combination Figures 1 to 5 As shown in the figure, the heat exchange phase change dust removal combined device for converter flue gas of the embodiment includes a dust removal tower 1, the top end of the dust removal tower 1 is provided with a flue gas outlet 2, the bottom end of the dust removal tower 1 is provided with a flue gas inlet 3, the outer side upper end and the lower end of the dust removal tower 1 are fixedly connected with mounting brackets 8, the dust removal tower 1 can be installed at the top of a chimney or an exhaust cylinder through the mounting brackets 8, and a wire mesh filtering assembly 4 is arranged at the inner upper end of the dust removal tower 1. Figure 3 As shown in the figure, the wire mesh filtering assembly 4 includes a wire mesh body 41, the wire mesh body 41 adopts a particle gas filter screen, the layer number of the wire mesh body 41 is variable and is 2 layers, 4 layers and 6 layers, and the mesh number of the wire mesh body 41 can be 20 meshes, 40 meshes or 60 meshes; the material of the wire mesh body 41 is mainly 304 stainless steel wire, a fixed plate 42 is fixedly connected to the outer side of the wire mesh body 41, fastening bolts 43 are arranged on the fixed plate 42, and the fixed plate 42 can be fixedly installed on the inner wall of the dust removal tower 1 through the fastening bolts 43.

[0039] As shown in the figure, Figure 1As shown, the wire mesh filter assembly 4 is provided with a water pipe 5, which is fixedly installed in the inner wall of the dust removal tower 1 in an S-curve shape, and one end penetrates the side wall of the dust removal tower 1 and is fixedly connected with the water outlet of the external water pump. The bottom end of the water pipe 5 is uniformly fixedly installed with a plurality of spray heads 6. The spray heads 6 adopt atomizing spray heads, and water for spraying can be conveyed into the water pipe 5 by the external water pump.

[0040] In combination Figure 4 And Figure 5 As shown, the heat exchange assembly 7 includes a metal circular plate 71 and a plurality of pipe network fixing rings 72. The metal circular plate 71 is fixedly installed on the outer wall of the dust removal tower 1. The inner side of each pipe network fixing ring 72 is provided with a heat exchange pipe network 73. The heat exchange pipes in each layer of heat exchange pipe network 73 are fixedly connected with the pipe network fixing ring 72 by penetrating the side wall of the dust removal tower 1. The outer side of the pipe network fixing ring 72 is fixedly connected with two plug-in strips 74 in a symmetrical manner. The inner side of the metal circular plate 71 is uniformly provided with a plurality of groups of insertion grooves 75. The plug-in strips 74 are matched with the insertion grooves 75 and are connected in a sliding manner. The number of each group of insertion grooves 75 is two, which are centrally symmetrically distributed and have the same groove depth.

[0041] As shown in Figure 4 And Figure 5 As shown, the number of insertion grooves 75 is three groups. The groove depths of each group of insertion grooves 75 are different. That is, the two plug-in strips 74 below the pipe network fixing ring 72 on which the heat exchange pipe network 73 is installed are respectively inserted into the two insertion grooves 75 with the deepest groove depth on the metal circular plate 71, and then the two plug-in strips 74 below the other pipe network fixing ring 72 on which the heat exchange pipe network 73 is installed are respectively inserted into the insertion grooves 75 with the second deepest groove depth on the metal circular plate 71. In this way, different numbers of heat exchange pipe networks can be assembled according to actual dust removal needs, so as to meet the heat exchange and cooling of smoke with different temperatures, which is more flexible and has higher applicability.

[0042] In this embodiment, each layer of heat exchange pipe network 73 includes a plurality of heat exchange pipes arranged in a staggered manner. The shape of the heat exchange pipe is flat or oval, like a duck bill. The arrangement of the heat exchange pipes is staggered horizontally and vertically, with the vertical arrangement on the top and the horizontal arrangement on the bottom. The number of heat exchange pipes is determined according to actual heat exchange needs. Each heat exchange pipe is filled with a phase change layer. The phase change layer is a composite phase change material mainly composed of paraffin, and also contains nano copper powder, high molecular polymer, expanded graphite and other substances as heat exchange medium, and is filled in the heat exchange pipe at a compact density. It is noted that the phase change material also includes nano copper powder, expanded graphite, high molecular polymer, etc.

[0043] Further, the heat exchange assembly 7 is distributed at a quarter or a fifth of the height inside the dust removal tower 1, the heat exchange assembly 7 is 2m-5m away from the height of the spray head 6, and the distance between the wire mesh filtering assembly 4 and the top end of the water pipe 5 is 1m-2m. It is explained that the above distance is only an embodiment of the device, and the above distance needs to be determined according to the actual situation in the actual installation process.

[0044] It should be noted that the heat exchange phase change dust removal combined device for converter flue gas of the utility model, such as Figure 2 As shown, taking the low-temperature converter flue gas in the dust removal tower 1 as an example, the flue gas with a temperature of about 300-60 DEG C enters the dust removal tower 1 from the flue gas inlet 3, and the flue gas rises in the dust removal tower 1, when the flue gas passes through the heat exchange assembly 7, due to the characteristics of paraffin, the phase change layer in the heat exchange pipe will melt, and flow in the heat exchange pipe in the form of fluid, better heat exchange with the flue gas, so that the temperature of the flue gas can be reduced to about 45-35 DEG C (according to the nature of paraffin, when the temperature is reduced to about 55 DEG C, paraffin will condense into solid, at this time, the heat exchange effect is greatly reduced, and the heat preservation effect is relatively good).

[0045] At the same time, the spray head 6 in the dust removal tower 1 sprays spray water, and the spray water also cools the flue gas, in this process, the water vapor carried by the flue gas itself will also be reduced with the temperature. When the water meets the flue gas with a higher temperature, the water will directly evaporate into water vapor, according to the principle of vapor phase change agglomeration growth, the water will form a large amount of water mist due to the flue gas with a higher temperature, and the water mist and the condensed water droplets will wrap the small particles with PM less than 10 microns in the flue gas to form larger fine particles, which will fall to the lower part of the dust removal tower 1 under the action of gravity, and the falling fine particles will be attached to the heat exchange pipe, and part of the fine particles will reach the wire mesh body 41 due to continuous flow, at this time, the wire mesh body 41 can well intercept the part of the fine particles, and finally the flue gas after dust removal is discharged through the flue gas outlet 2; when the flue gas stops being introduced, the spray head 6 sprays spray water to wash the particles on the surface of the heat exchange pipe, and the fine particles attached to the heat exchange pipe and the wire mesh body 41 are settled and removed.

[0046] It is explained that the initial temperature of the heat exchange pipe is about 38 DEG C, and the composite phase change material mainly composed of paraffin can obtain a solid phase change layer after heat exchange when the temperature of the flue gas is reduced. Moreover, since there is no direct contact with the flue gas (contact through the heat exchange pipe), the service life and the stability of the material are greatly increased.

[0047] Compared with the existing phase change heat exchange dust removal device for low-temperature converter flue gas, the utility model is simple and practical, because of the action of heat exchanger, can carry out dust removal to higher temperature flue gas, has promoted the dust removal range of flue gas, temperature reduction also makes the equipment operation in dust removal tower more safe, prolongs the service life, and can assemble the pipe heat pipe network of different layers according to actual dust removal demand, higher applicability, utilizes the related principle of steam phase change to improve the dust removal effect to flue gas, while the existence of silk screen effectively prevents the outflow of fine particle nucleator.

[0048] The utility model discloses the example is only to the preferred implementation of the utility model is described, and is not to the utility model concept and range is limited, on the premise of not departing from the utility model design thought, the various deformation and improvement of the utility model technical scheme of the engineering and technical personnel to the utility model, all should fall into the protection scope of the utility model.

Claims

1. A heat exchange phase change dust removal combined device for converter flue gas, comprising a dust removal tower (1), a flue gas outlet (2) is arranged at the top end of the dust removal tower (1), a flue gas inlet (3) is arranged at the bottom end of the dust removal tower (1), and mounting brackets (8) are fixedly connected to the upper end and the lower end of the outer side of the dust removal tower (1); characterized in that a wire mesh filtering assembly (4) is arranged at the upper end inside the dust removal tower (1), and a heat exchange assembly (7) is arranged at the lower end inside the dust removal tower (1); the wire mesh filtering assembly (4) comprises a wire mesh body (41), a fixed plate (42) is fixedly connected to the outer side of the wire mesh body (41), and fastening bolts (43) are arranged on the fixed plate (42); the heat exchange assembly (7) comprises a metal circular ring plate (71) and a plurality of pipe network fixing rings (72), a heat exchange pipe network (73) is arranged inside each pipe network fixing ring (72), two plug-in strips (74) are fixedly connected to the outer side of the pipe network fixing ring (72) in a symmetrical manner, a plurality of groups of insertion grooves (75) are uniformly formed in the inner side of the metal circular ring plate (71), and the heat exchange pipe network (73) comprises a plurality of heat exchange pipes which are distributed in a staggered manner, and each heat exchange pipe is filled with a phase change layer inside. A water pipe (5) is arranged above the wire mesh filtering assembly (4), and a plurality of spray heads (6) are uniformly fixedly installed at the bottom end of the water pipe (5).

2. The combined heat exchange and phase transformation dust removal device for converter flue gas according to claim 1, characterized in that, The wire mesh body (41) is a particle gas filter screen, and the fixed plate (42) is fixedly installed on the inner wall of the dust removal tower (1) by means of the fastening bolts (43).

3. The combined heat exchange and phase transformation dust removal device for converter flue gas according to claim 2, characterized in that, The metal circular ring plate (71) is fixedly installed on the outer wall of the dust removal tower (1), and the heat exchange pipes in each layer of the heat exchange pipe network (73) penetrate through the side wall of the dust removal tower (1) and are fixedly connected to the pipe network fixing ring (72).

4. The combined heat exchange and phase transformation dedusting device for converter flue gas according to any one of claims 1-3, characterized in that, The number of each group of insertion grooves (75) is two, which are centrally symmetrically distributed and have the same groove depth.

5. The combined heat exchange and phase transformation dust removal device for converter flue gas according to claim 4, characterized in that, The water pipe (5) is fixedly installed in an S-curve shape on the inner wall of the dust removal tower (1), and one end penetrates through the side wall of the dust removal tower (1) and is fixedly communicated with the water outlet of an external water pump.

6. The combined heat exchange and phase transformation dust removal device for converter flue gas according to claim 5, characterized in that, The mesh number of the wire mesh body (41) is 20 mesh, 40 mesh or 60 mesh.

7. The combined heat exchange and phase transformation dust removal device for converter flue gas according to claim 6, characterized in that, The shape of the heat exchange pipe network (73) is flat or oval, like a duckbill, and the arrangement mode of the heat exchange pipe network (73) adopts horizontal and vertical staggered arrangement, with the vertical arrangement being above the horizontal arrangement.

8. The combined heat exchange and phase transformation dust removal device for converter flue gas according to claim 7, characterized in that, The heat exchange assembly (7) is distributed at a height of one fourth or one fifth of the internal height of the dust removal tower (1).

9. The combined heat exchange and phase transformation dust removal device for converter flue gas according to claim 8, characterized in that, The height of the heat exchange assembly (7) from the spray head (6) is 2m-5m, and the distance between the top end of the wire mesh filtering assembly (4) and the water pipe (5) is 1m-2m.

10. The combined heat exchange and phase transformation dust removal device for converter flue gas according to claim 9, characterized in that, ​

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