Waste heat recovery system

Abstract

A waste heat recovery system comprises a fan, a heat exchanger and a gas-water separation tank, a gas inlet of the heat exchanger is connected with the fan, a gas outlet of the heat exchanger is connected with the gas-water separation tank through a pipeline, and the waste heat recovery system is characterized in that a primary filter tank is arranged between the fan and the heat exchanger; an adsorption filtering assembly is installed at the upper end of the interior of the gas-water separation tank, and a water outlet formed in the bottom of the gas-water separation tank is connected with a recycling pool through a pipeline. Impurities carried in the high-temperature steam are filtered out through the filter screen plate and then conveyed into the heat exchange box for heat exchange, the problem of blockage caused by impurity accumulation in the heat exchange pipe is solved, the adsorption filter assembly is installed in the gas-water separation box in a drawing mode, and regular replacement operation of an adsorbent is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the waste heat recovery technology field of high temperature steam in papermaking industry especially relates to a waste heat recovery system. BACKGROUND

[0002] In the production process of boxboard, it is necessary to dry the boxboard after gluing, remove the water in the pressed paper sheet, and at the same time improve the strength and smoothness of the paper. At present, the drying of boxboard is mainly through the inlet of high temperature steam in the drying part, and the high temperature steam flows in the high temperature steam pipe and is distributed to several groups of gas supply branch pipes. The high temperature steam is also discharged outward through several groups of air holes while preheating the pipeline, thereby heating and removing water from the boxboard. In this drying process, the production line consumes a large amount of steam, and if it is directly treated and discharged, it will cause waste of heat, resulting in increased energy consumption and cost of the papermaking production line, which is not conducive to energy saving and environmental protection.

[0003] The existing technology of patent number CN219670943U discloses a papermaking drying waste heat recovery and reuse system, which sequentially includes a drying cylinder, a heat exchange tank and a filter tank. The heated cooling liquid is passed to the spray pipe, sprayed through the spray head and washed the net part, and the cooled high temperature steam is separated from the waste through the filter tank, and the water vapor is condensed into water and separated from other gases for discharge, thereby improving the energy saving and environmental protection effect.

[0004] The above existing technology has at least the following problems in application:

[0005] Problem 1: The high temperature steam generated by papermaking is directly transported to the serpentine pipe in the heat exchange tank and exchanges heat with the cooling liquid in the tank. Since the steam generated in the papermaking process contains some insoluble particulate impurities, it is not filtered before being transported to the heat exchange pipe, which will cause pipe blockage problem over a long period of time, affecting the subsequent waste heat recovery efficiency.

[0006] Problem 2: After heat exchange, part of the high temperature steam is condensed into water, and the other part is composed of steam and other gases. This part is discharged after being filtered and treated by activated carbon, but the activated carbon used for filtering needs to be replaced regularly. In the existing technology, the lid of the filter tank needs to be opened to replace it, which makes the replacement operation more troublesome.

[0007] In view of the above problems, a waste heat recovery system is proposed. UTILITY MODEL CONTENT

[0008] In view of the above technical problems, the waste heat recovery system is provided with a primary filter box to filter high-temperature steam, thereby reducing the problem of blockage of the heat exchange pipe due to impurity accumulation, and the adsorption filter assembly is installed in the gas-water separation tank in a pulling manner, thereby facilitating regular replacement of the adsorbent.

[0009] To achieve the above object, the technical scheme of the utility model is as follows:

[0010] A waste heat recovery system comprises a fan, a heat exchanger and a gas-water separation tank, the air inlet of the heat exchanger is connected with the fan, the air outlet of the heat exchanger is connected with the gas-water separation tank through a pipeline, and the fan is connected with the heat exchanger and is provided with a primary filter box, the inside upper end of the gas-water separation tank is provided with an adsorption filter assembly, and the bottom of the gas-water separation tank is provided with a drain opening connected with a recovery tank through a pipeline.

[0011] The primary filter box is composed of a filter box body and a primary filter assembly, the inside of the filter box body is provided with the primary filter assembly, the primary filter assembly comprises an upper fixed plate, a lower fixed plate, a filter screen plate and a cleaning part, the filter screen plate and the cleaning part are arranged between the upper fixed plate and the lower fixed plate, four corners of the upper fixed plate are fixed on the mounting grooves arranged on the filter box body through screws, and the lower fixed plate is clamped between two limiting strips arranged on the inner wall of the bottom of the filter box body.

[0012] The cleaning part is composed of a cleaning motor, a lead screw, a connecting block and a cleaning brush, the cleaning motor is arranged on the upper fixed plate, the output end of the cleaning motor is connected with the lead screw, the lead screw is arranged between the upper fixed plate and the lower fixed plate through a bearing, the lead screw is threadedly connected with the connecting block, the front end of the connecting block is arranged with the cleaning brush, and the bristle end of the cleaning brush is arranged in contact with the filter screen plate.

[0013] The heat exchanger is composed of a heat exchange box body and a heat exchange pipe, the heat exchange pipe is arranged in a snakelike loop structure in the heat exchange box body, one end of the heat exchange pipe is connected with the air outlet of the filter box body, the other end of the heat exchange pipe is connected with the air inlet of the gas-water separation tank, and the heat exchange box body is provided with a water inlet and a water outlet.

[0014] The adsorption filter assembly comprises a pulling box, a pulling end plate and an adsorbent, the pulling box is slidingly connected in the inside of the gas-water separation tank, the convex strips arranged on the two side walls of the inside of the gas-water separation tank are connected in the sliding grooves arranged on the side of the pulling box, the front end of the pulling box is fixedly arranged with the pulling end plate, the bottom of the pulling box is arranged in a mesh structure, and the adsorbent is placed in the inside of the pulling box.

[0015] Specifically, the guide hole arranged on the connecting block is connected with the guide column, and the guide column is fixedly arranged between the upper fixed plate and the lower fixed plate.

[0016] Specifically, the pull end plate is matched with the gas-water separation tank, and a magnetic attraction lock is arranged between the two.

[0017] Specifically, the lower fixed plate is provided with a recovery groove for recovering impurities cleaned by the cleaning brush on the filter screen plate.

[0018] Specifically, the upper fixed plate is provided with a pull ring for facilitating the removal of the primary filter assembly for cleaning.

[0019] The utility model discloses the beneficial effects of:

[0020] The utility model adds the primary filter box to filter high-temperature steam, and after the impurities carried in the high-temperature steam are filtered by the filter screen plate, the high-temperature steam is conveyed to the heat exchange tank for heat exchange, so that the problem of blockage of the heat exchange pipe caused by impurity accumulation is reduced.

[0021] The utility model discloses the cleaning part in primary filter assembly, and the filter screen plate is cleaned through the reciprocating motion of the cleaning brush controlled by the cleaning motor and the screw rod, so that the influence of the accumulated impurities on the filter screen plate on the filtering effect is avoided, and the impurities cleaned fall into the recovery groove on the lower fixed plate for recovery, in addition, the whole primary filter assembly is detachably installed in the filter box body, and can be integrally taken out for cleaning regularly.

[0022] The utility model discloses the adsorption filter assembly in the gas-water separation tank is installed in the pull mode, and the adsorbent can be conveniently replaced regularly. DRAWINGS

[0023] Figure 1 It is the whole structure schematic view of the utility model kind of waste heat recovery system;

[0024] Figure 2 It is the local structure schematic view of the primary filter box of the utility model kind of waste heat recovery system;

[0025] Figure 3 It is the structure schematic view of the primary filter assembly of the utility model kind of waste heat recovery system;

[0026] Figure 4 It is the local structure schematic view of the gas-water separation tank of the utility model kind of waste heat recovery system;

[0027] Figure 5 It is the structure schematic view of the gas-water separation tank of the utility model kind of waste heat recovery system;

[0028] Fan, 21. filter box, 211. limit strip, 22. primary filter assembly, 221. upper fixed plate, 222. lower fixed plate, 2221. recovery groove, 223. filter screen, 224. cleaning motor, 225. screw rod, 226. connecting block, 227. cleaning brush, 228. guide column, 229. pull ring, 31. heat exchange box, 311. water inlet, 312. water outlet, 32. heat exchange pipe, 4. gas-water separation tank, 41. exhaust port, 42. convex strip, 51. adsorbent, 52. pull box, 521. chute, 53. pull end plate, 531. magnetic lock, 6. recovery pool. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0032] Embodiment 1

[0033] As shown in the figure, the heat exchanger is composed of a heat exchange box 31 and a heat exchange pipe 32, the heat exchange pipe 32 is arranged in a serpentine loop structure in the heat exchange box 31, one end of the heat exchange pipe 32 is connected with the air outlet of the filter box 21, the other end of the heat exchange pipe 32 is connected with the air inlet of the gas-water separation tank 4, the water inlet 311 and the water outlet 312 are arranged on the heat exchange box 31, water is injected into the heat exchange box 31 through the water inlet 311, the water with high temperature after heat exchange is discharged from the water outlet 312 for use, the heat exchange between the high-temperature steam and the water is realized through the heat exchanger, and the heat in the high-temperature steam can be recycled,

[0034] The air inlet of the filter box 21 is connected with the fan 1, the high-temperature steam is transported into the filter box 21 through the fan 1, the primary filter assembly 22 is installed in the filter box 21, the primary filter assembly 22 includes an upper fixed plate 221, a lower fixed plate 222, a filter screen plate 223 and a cleaning part, the filter screen plate 223 and the cleaning part are installed between the upper fixed plate 221 and the lower fixed plate 222, the four corners of the upper fixed plate 221 are fixed on the mounting grooves arranged on the filter box 21 through screws, the lower fixed plate 222 is clamped between the two limiting strips 211 arranged on the inner wall of the bottom of the filter box 21, and a pull ring 229 is arranged on the upper fixed plate 221, so that the primary filter assembly 22 can be taken out for cleaning,

[0035] The cleaning motor 224 in the cleaning part is installed on the upper fixed plate 221, the output end of the cleaning motor 224 is connected with a lead screw 225, the lead screw 225 is installed between the upper fixed plate 221 and the lower fixed plate 222 through a bearing, the lead screw 225 is threadedly connected with a connecting block 226, the front end of the connecting block 226 is installed with a cleaning brush 227, the bristle end of the cleaning brush 227 is arranged in contact with the filter screen plate 223, the guide hole arranged on the connecting block 226 is penetrated by a guide column 228, the guide column 228 is fixedly installed between the upper fixed plate 221 and the lower fixed plate 222, the movement of the connecting block 226 is limited and guided by the guide column 228, and a recovery groove 2221 is arranged on the lower fixed plate 222, which is used for recovering the impurities cleaned from the filter screen plate 223 by the cleaning brush 227,

[0036] The air outlet of the heat exchange box 31 is connected with the gas-water separation tank 4 through a pipeline, the gas-water separation tank 4 is provided with an air outlet 41 at the top, a water outlet arranged at the bottom of the gas-water separation tank 41 is connected with a recovery tank 6 through a pipeline, a pull-out box 52 is installed in the gas-water separation tank 4 in a pull-out sliding mode, the protruding strips 42 arranged on the two side walls in the gas-water separation tank 4 are connected in the sliding grooves 521 arranged on the side of the pull-out box 52, the bottom of the pull-out box 52 is provided with a mesh structure, and an adsorbent 51 is placed in the pull-out box 52, wherein the adsorbent can be activated carbon adsorbent to adsorb the gas and reduce the pollution of the discharged gas to the environment,

[0037] The front end of the pull-out box 52 is fixedly provided with a pull-out end plate 53, the pull-out end plate 52 is matched with the gas-water separation tank 4, and a magnetic suction lock 531 is arranged between the two. The magnetic suction lock 531 is a commercially available existing device, and the principle thereof is mainly to use the principle of an electromagnet to generate a magnetic force to realize the locking and unlocking functions, so that the magnetic suction lock is not described in detail in the present application.

[0038] Embodiment 2

[0039] In the use of the utility model, high-temperature steam is delivered to the heat exchanger through the fan 1 and exchanges heat with water. The primary filter box is additionally arranged between the fan 1 and the air inlet of the heat exchanger to filter the high-temperature steam. The steam first enters the filter box body 21, and the impurities carried in the high-temperature steam are filtered out through the filter screen plate 223 and then delivered to the heat exchange pipe 32 in the heat exchange box body 31 to exchange heat with the water in the box, thereby reducing the problem of blockage of the heat exchange pipe 32 due to the accumulation of impurities.

[0040] The entire primary filter assembly 22 is detachably installed in the filter box body 21 and can be taken out as a whole for cleaning and maintenance at regular intervals. In addition, a cleaning part is designed in the primary filter assembly 22. The cleaning motor 224 is started to control the axial reciprocating motion of the cleaning brush 227 through the cleaning motor 224 and the lead screw 225, thereby realizing the cleaning of the filter screen plate 223 and avoiding the influence of the accumulated impurities on the filter screen plate 223 on the filtering effect. The cleaned impurities fall into the recycling groove 2221 on the lower fixed plate 222 for recycling.

[0041] After the high-temperature steam exchanges heat with water in the heat exchange box body 31, part of the steam condenses into water, and the other part of the steam that fails to condense into water and a small amount of other gases are discharged. After heat exchange, they enter the gas-water separation tank 4 for gas-water separation. The water is collected from the bottom of the recycling pool 6 for recycling treatment, and the gas floats through the adsorption filter assembly. The active carbon adsorbent adsorbs the gas to minimize the discharge of harmful substances and reduce environmental pollution.

[0042] The pull-out box 52 in the adsorption filter assembly is installed in the gas-water separation tank 4 in a pull-out manner. When the adsorbent 51 needs to be replaced, the operator only needs to close the magnetic suction lock, pull out the pull-out box 52, take out the adsorbent inside, and then replace the new adsorbent, which is convenient to operate.

[0043] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. The various components mentioned in the utility model are common technology in the prior art, which should be understood by the skilled person in the industry. The utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A waste heat recovery system characterized by It is characterized in that the primary filter box is arranged between the fan and the heat exchanger, the adsorption filter assembly is arranged at the upper end of the gas-water separation tank, and the drain port arranged at the bottom of the gas-water separation tank is connected with the recovery tank through a pipeline.

2. A waste heat recovery system according to claim 1, characterised in that The primary filter box is composed of a filter box body and a primary filter assembly, the primary filter assembly is arranged in the filter box body, the primary filter assembly comprises an upper fixed plate, a lower fixed plate, a filter screen plate and a cleaning part, the filter screen plate and the cleaning part are arranged between the upper fixed plate and the lower fixed plate, the four corners of the upper fixed plate are fixed on the mounting grooves arranged on the filter box body through screws, and the lower fixed plate is clamped between the two limiting strips arranged on the inner wall of the bottom of the filter box body.

3. A waste heat recovery system according to claim 2, wherein The cleaning part is composed of a cleaning motor, a lead screw, a connecting block and a cleaning brush, the cleaning motor is arranged on the upper fixed plate, the output end of the cleaning motor is connected with the lead screw, the lead screw is arranged between the upper fixed plate and the lower fixed plate through a bearing, the lead screw is threadedly connected with the connecting block, the front end of the connecting block is provided with the cleaning brush, and the bristle end of the cleaning brush is arranged in contact with the filter screen plate.

4. A waste heat recovery system according to claim 1, wherein The heat exchanger is composed of a heat exchange box body and heat exchange pipes, the heat exchange pipes are arranged in a snakelike loop structure in the heat exchange box body, one end of the heat exchange pipes is connected with the air outlet of the filter box body, the other end of the heat exchange pipes is connected with the air inlet of the gas-water separation tank, and the heat exchange box body is provided with a water inlet and a water outlet.

5. A waste heat recovery system according to claim 1, wherein The adsorption filter assembly comprises a pull-out box, a pull-out end plate and an adsorbent, the pull-out box is slidably connected in the gas-water separation tank, the convex strips arranged on the two side walls of the gas-water separation tank are connected in the sliding grooves arranged on the side of the pull-out box, the pull-out end plate is fixedly arranged at the front end of the pull-out box, the bottom of the pull-out box is provided with a mesh structure, and the adsorbent is placed in the pull-out box.

6. A waste heat recovery system according to claim 3, wherein The guide hole arranged on the connecting block is connected with the guide column, and the guide column is fixedly arranged between the upper fixed plate and the lower fixed plate.

7. A waste heat recovery system according to claim 5, wherein The pull-out end plate is matched with the gas-water separation tank, and a magnetic lock is arranged between the two.

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