Chemical waste liquid waste heat recovery device

Abstract

The invention discloses a waste heat recovery device for chemical waste liquid, which relates to the field of chemical waste liquid treatment. The device comprises a box body, a plug disc is arranged inside the box body, a heat exchange chamber is formed between the plug disc and the top of the box body, a waste discharge port penetrating the heat exchange chamber is arranged on the surface of the box body, and the device also comprises a spiral tube, the top and bottom of the spiral tube are respectively connected to the top and bottom of the heat exchange chamber, the spiral tube has a spiral filtering gap of uniform size, a synchronous valve is arranged on the top of the box body, a liquid pump introduces waste liquid into the inner side of the spiral tube through the synchronous valve, and the waste liquid is filtered through the spiral filtering gap and then discharged from the waste discharge port. The device adopts the spiral tube to conduct clean water and chemical waste water in the heat exchange chamber for heat exchange, has a large heat exchange area, and the spiral filtering gap of the spiral tube can filter and remove impurities in the waste water, the waste heat recovery work is closely combined with the impurity removal work, the treatment process of chemical waste water is greatly optimized, and has a high heat recovery rate.

Description

Technical Field

[0001] The invention relates to the field of chemical waste liquid treatment, and in particular to a chemical waste liquid waste heat recovery device. Background Art

[0002] Wastewater generated by chemical production often has high heat content. Direct harmless treatment and discharge of wastewater will cause a large amount of energy waste. The implementation of waste heat recovery and utilization can not only reduce resource waste, but also reduce chemical production costs.

[0003] There are many ways to recycle waste heat. Exchanging heat between high-temperature wastewater and production water is a more direct way to recover heat. Generally, waste heat recovery is carried out before the wastewater is harmlessly treated. Insoluble impurities in the wastewater will hinder the continuous and normal operation of the waste heat recovery system. Although impurity treatment of the wastewater before waste heat recovery can avoid affecting subsequent waste heat recovery, the wastewater will dissipate heat after passing through an independent impurity removal process, reducing the energy of subsequent waste heat recovery. Summary of the invention

[0004] In order to make up for the deficiencies of the existing technical problems, the purpose of the present invention is to provide a chemical waste liquid waste heat recovery device, which is used to solve the problem that it is difficult to closely combine chemical waste water waste heat recovery with impurity removal, avoid the impact of impurities in the waste water on the waste heat recovery system, and improve the heat recovery rate.

[0005] In order to solve the problems of the prior art, the technical solution of the present invention is as follows:

[0006] The device for recovering waste heat from chemical waste liquid comprises a box body, a plug disc is arranged inside the box body, a heat exchange chamber is formed between the plug disc and the top of the box body, a waste outlet penetrating the heat exchange chamber is arranged on the surface of the box body, and a spiral tube is also included, the top and bottom of the spiral tube are respectively connected to the top and bottom of the heat exchange chamber, the spiral tube has a spiral filtering gap of uniform size, a synchronous valve is arranged on the top of the box body, a liquid pump introduces waste liquid into the inner side of the spiral tube through the synchronous valve, the waste liquid is filtered through the spiral filtering gap and then discharged from the waste outlet, and both ends of the spiral tube are connected to an external clean water pipeline.

[0007] Preferably, a plurality of groups of spiral tubes are concentrically sleeved in the heat exchange chamber, and the spiral filtering gap of the spiral tubes gradually decreases from the inside to the outside.

[0008] Preferably, a plurality of groups of limiting rings are concentrically arranged on the inner top surface of the box body and the upper surface of the plug disc, annular limiting grooves are formed between each group of limiting rings, and both ends of the spiral tube are adapted to be fixed in the annular limiting grooves.

[0009] Preferably, an upper liquid collecting chamber is opened in the top wall of the box body, and a lower liquid collecting chamber is opened in the plug plate. The two ends of the spiral tube are respectively connected to the upper liquid collecting chamber and the lower liquid collecting chamber. The lower liquid collecting chamber is connected to the external clean water inlet pipeline through a pipeline, and the upper liquid collecting chamber is connected to the external clean water discharge pipeline through the synchronization valve.

[0010] Preferably, the synchronous valve includes an upper ring shell and a lower ring shell, and an inner rubber tube and an outer rubber tube arranged inside and outside are connected between the upper ring shell and the lower ring shell, both ends of the inner rubber tube pass through the end faces of the upper ring shell and the lower ring shell to form a central through cavity, the drainage end of the liquid pump is connected to the central through cavity, and an annular through cavity is formed between the inner rubber tube and the outer rubber tube, which passes through the inner cavities of the upper ring shell and the lower ring shell from top to bottom, and the annular through cavity is covered on the outside of the central through cavity, the external clean water discharge pipe is connected to the inner cavity of the upper ring shell, and the upper liquid collecting cavity is connected to the inner cavity of the lower ring shell.

[0011] Preferably, the inner rubber tube and the outer rubber tube are both made of flexible rubber material, and a plurality of return springs are evenly distributed in an annular shape around the outside of the outer rubber tube. Both ends of the return springs are twisted and misaligned to connect the upper ring shell and the lower ring shell. When the return spring contracts and pulls the upper ring shell and the lower ring shell closer together, the inner rubber tube and the outer rubber tube are in a twisted state, so that the annular through cavity and the central through cavity are closed.

[0012] Preferably, the plug disc is slidably matched with the inner wall of the box body, and a driving telescopic rod is installed at the bottom of the box body, which drives the plug disc to move, so as to adjust the spiral filtering gap size of the spiral tube.

[0013] Preferably, a pressure sensor is provided at the connection portion between the driving telescopic rod and the plug disc, a retaining ring which slides in contact with the inner wall of the box body is fixed on the top of the plug disc, a through opening is provided on the surface of the retaining ring, and a debris removal opening is provided on the surface of the box body below the waste outlet, and the driving telescopic rod drives the plug disc to move up and down so that the through opening is connected to either the waste outlet or the debris removal opening.

[0014] Compared with the prior art, the advantages of the present invention are as follows:

[0015] 1. The present invention adopts a spiral tube to conduct clean water and chemical wastewater in the heat exchange chamber for heat exchange, which has a large heat exchange area. The spiral filter gap of the spiral tube can filter and remove impurities in the wastewater. The waste heat recovery work is closely combined with the impurity removal work, which greatly optimizes the treatment process of chemical wastewater and has a high heat recovery rate.

[0016] 2. The present invention controls the movement of the plug disc by driving the telescopic rod, so that the spiral tube is stretched, which is used to adjust the size of the spiral filtration gap and can be adaptively adjusted for wastewater generated by different chemical processes.

[0017] 3. The present invention adopts a pressure sensor to monitor the pressure of the plug disc, and feeds back the water pressure inside the spiral tube through the change of the pressure value, so as to realize the monitoring of the conduction effect of the spiral filter gap. The plug disc is driven down by driving the telescopic rod to stretch the spiral tube, and at the same time the waste discharge port is blocked and the impurity removal port is opened. The blockage in the spiral filter gap can be discharged from the impurity removal port, so as to realize the self-cleaning effect.

[0018] 4. The present invention conducts clean water and waste water respectively through the concentrically arranged inner rubber tube and outer rubber tube, so as to improve the waste heat recovery effect. At the same time, the inner rubber tube and the outer rubber tube can be twisted and deformed through the torsional elastic force of the reset spring, so as to synchronously adjust the conduction efficiency of clean water and waste water and coordinate the waste heat recovery work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0021] Figure 3 This is one of the schematic diagrams of the synchronous valve state deformation of the present invention.

[0022] Figure 4 This is the second schematic diagram of the synchronous valve state deformation of the present invention.

[0023] Figure 5 It is a schematic diagram of the structure of the synchronous valve of the present invention.

[0024] Figure numerals: 1. Box body; 11. Waste outlet; 12. De-impurity outlet; 13. Upper liquid collecting chamber; 2. Synchronous valve; 21. Upper ring shell; 22. Lower ring shell; 23. Outer rubber tube; 24. Inner rubber tube; 25. Reset spring; 3. Liquid pump; 4. Spiral tube; 5. Driving telescopic rod; 51. Pressure sensor; 6. Plug disk; 61. Lower liquid collecting chamber; 62. Retaining ring; 63. Through port; 7. Limiting ring. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] like Figure 1 , Figure 2As shown, the chemical waste liquid waste heat recovery device is composed of a cylindrical box body 1 as the main body, a plug disc 6 is arranged at the lower position inside the box body 1, a heat exchange chamber is formed between the plug disc 6 and the top of the box body 1, a waste outlet 11 is installed at the lower part of the box body 1, the waste outlet 11 is connected with the heat exchange chamber, a spiral tube 4 is arranged along the axis in the heat exchange chamber, a group of limiting rings 7 are fixed on the inner top surface of the box body 1 and the upper surface of the plug disc 6, an annular limiting groove is formed between the limiting rings 7, and both ends of the spiral tube 4 are adapted and fixed in the annular limiting groove, so that the spiral tube 4 is kept The spiral gap of the spiral tube 4 forms a spiral filtering gap of uniform size, an upper liquid collecting chamber 13 is opened in the top wall of the box body 1, and a lower liquid collecting chamber 61 is opened inside the plug plate 6. The two ends of the spiral tube 4 are respectively connected to the upper liquid collecting chamber 13 and the lower liquid collecting chamber 61. The lower liquid collecting chamber 61 is connected to the external clean water inlet pipeline through a pipeline, and the upper liquid collecting chamber 13 is connected to the external clean water discharge pipeline. The liquid pump 3 is installed on the top of the box body 1, and the drainage end of the liquid pump 3 is connected to the central part of the heat exchange chamber. The water inlet end of the liquid pump 3 is connected to the wastewater pipeline of the factory;

[0027] Turn on the liquid pump 3 to introduce the production wastewater of the chemical plant into the inner side of the spiral tube 4, and at the same time, the clean water for production is introduced into the lower liquid chamber 61. The clean water is conducted upward along the spiral tube 4 to the upper liquid chamber 13 and then discharged. The wastewater with heat passes through the spiral filter gap, and the debris in the wastewater is filtered and retained in the spiral tube 4. The filtered wastewater is discharged from the waste outlet 11. When the wastewater passes through the spiral filter gap, the heat is conducted to the clean water in the spiral tube 4, so that the clean water temperature is increased, thereby realizing heat recovery.

[0028] like Figure 2 As shown, a plurality of groups of spiral tubes 4 are concentrically sleeved in the heat exchange chamber, and the spiral filtration gap of the spiral tubes 4 gradually decreases from the inside to the outside, and both ends of each group of spiral tubes 4 are connected to the upper liquid collecting chamber 13 and the lower liquid collecting chamber 61, and both ends of each group of spiral tubes 4 are fixed by an annular limiting groove;

[0029] By arranging multiple groups of spiral tubes 4, the heat exchange area is greatly increased and the heat recovery rate is improved. In addition, the multiple groups of spiral tubes 4 form a filtering system with gradually increasing accuracy from the inside to the outside, which is used for layered filtering of debris in the wastewater, which not only improves the accuracy of wastewater filtration, but also avoids blockage caused by excessive accumulation of debris, thereby extending the maintenance cycle.

[0030] like Figure 2 As shown, the diameter of the plug disc 6 is adapted to the inner diameter of the box body 1, so that the plug disc 6 is assembled in the box body 1 in a vertical sliding manner, and a driving telescopic rod 5 is installed at the bottom center of the box body 1. The driving telescopic rod 5 adopts one of a cylinder, a hydraulic cylinder, and an electric push rod, and the telescopic end of the driving telescopic rod 5 is connected to the center of the plug disc 6;

[0031] By driving the telescopic rod 5 to drive the plug disc 6 to move up and down, the stretching range of the spiral tube 4 is adjusted to adaptively adjust the size of the spiral filter gap, and the corresponding heat exchange and filtration efficiency can be adjusted for different chemical process wastewaters.

[0032] Long-term filtration work of spiral tube 4 will gradually reduce the permeability, and regular self-cleaning work is required, which is implemented as follows:

[0033] like Figure 2 As shown, a pressure sensor 51 is installed at the connection position between the driving telescopic rod 5 and the plug disc 6. The pressure sensor 51 is connected to the driving telescopic rod 5 through a controller. A retaining ring 62 that slides and fits the inner wall of the box body 1 is fixed on the top of the plug disc 6. A through hole 63 is opened on the surface of the retaining ring 62. A debris removal port 12 is arranged below the waste discharge port 11 on the surface of the box body 1. The spiral tube 4 is made of an elastic copper alloy material so that the spiral tube 4 can be elastically retracted.

[0034] The liquid pump 3 introduces wastewater into the heat exchange chamber at a constant pressure. As the filtered impurities block the spiral filter gap of the spiral tube 4, the wastewater conduction area gradually decreases, causing the pressure inside the spiral tube 4 to gradually increase. The pressure is applied to the surface of the plug disc 6, and the pressure value of the plug disc 6 is monitored by the pressure sensor 51. When the pressure monitored by the pressure sensor 51 reaches the set value, the information is fed back to the controller, and the controller starts to drive the telescopic rod 5 to contract, causing the plug disc 6 to descend until the retaining ring 62 blocks the waste outlet 11 and the through port 63 is aligned with the impurity removal port 12. At this time, the spiral tube 4 is stretched and the spiral filter gap is enlarged. The blocked impurities can pass through the spiral gap and follow the wastewater to be discharged from the impurity removal port 12. After a certain period of cleaning work, the telescopic rod 5 is driven to extend again to realign the through port 63 with the waste outlet 11, and the filtering and heat exchange work is returned.

[0035] In order to ensure efficient heat exchange of clean water, it is necessary to keep the conduction efficiency of clean water and the conduction efficiency of waste water changing synchronously. The specific operations are as follows:

[0036] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the synchronous valve 2 includes an upper ring shell 21 and a lower ring shell 22, the lower ring shell 22 is fixed on the top of the box body 1, an inner rubber tube 24 and an outer rubber tube 23 are sealed and connected between the upper ring shell 21 and the lower ring shell 22, the inner rubber tube 24 is arranged on the inner side of the outer rubber tube 23, and both ends of the inner rubber tube 24 pass through the end faces of the upper ring shell 21 and the lower ring shell 22 to form a central through cavity, the drainage end of the liquid pump 3 is connected to the central through cavity, and an upper through cavity is formed between the inner rubber tube 24 and the outer rubber tube 23. The annular through cavity runs through the inner cavity of the upper ring shell 21 and the lower ring shell 22, and the annular through cavity is covered on the outside of the central through cavity. The external clean water discharge pipe is connected to the inner cavity of the upper ring shell 21, and the upper liquid collecting cavity 13 is connected to the inner cavity of the lower ring shell 22. The inner rubber tube 24 and the outer rubber tube 23 are both made of flexible rubber material. A plurality of return springs 25 are evenly distributed in an annular shape around the outer side of the outer rubber tube 23. Both ends of the return spring 25 are twisted and dislocated to connect the upper ring shell 21 and the lower ring shell 22;

[0037] When the wastewater heat recovery stops working, the upper ring shell 21 is moved closer to the lower ring shell 22 by the elastic force of the reset spring 25, and the upper ring shell 21 is twisted relative to the lower ring shell 22, so that the outer rubber tube 23 and the inner rubber tube 24 are twisted and deformed, and the annular cavity and the central cavity are blocked. When the wastewater heat recovery is carried out, the liquid pump 3 is turned on to increase the pressure and introduce wastewater into the central cavity. The water pressure expands the inner rubber tube 24, and the reset spring 25 is stretched. The inner rubber tube 24 and the reset spring 25 rotate and reset synchronously, so that the annular cavity and the central cavity are synchronously conducted, and the conduction work of the wastewater and the clean water is carried out synchronously. The greater the wastewater introduction pressure, the greater the rotation amplitude of the inner rubber tube 24, the larger the conduction area of ​​the central cavity, and the conduction area of ​​the annular cavity is also changing in a positive direction, so as to achieve a synchronous coordination effect.

[0038] Since the annular through cavity is coated on the outside of the central through cavity, the conducted clean water is coated on the outside of the conducted waste water, thereby improving the heat exchange effect.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Chemical waste liquid waste heat recovery device, including: A box body (1), wherein a plug disc (6) is arranged inside the box body (1), a heat exchange chamber is formed between the plug disc (6) and the top of the box body (1), a waste outlet (11) penetrating the heat exchange chamber is arranged on the surface of the box body (1), and the box body (1) further comprises a spiral tube (4), the top and bottom of the spiral tube (4) are respectively connected to the top and bottom of the heat exchange chamber, the spiral tube (4) has a spiral filter gap of uniform size, a synchronous valve (2) is arranged on the top of the box body (1), a liquid pump (3) introduces waste liquid into the inner side of the spiral tube (4) through the synchronous valve (2), and the waste liquid is filtered through the spiral filter gap and then discharged from the waste outlet (11), and both ends of the spiral tube (4) are connected to an external water purification pipeline; An upper liquid collecting chamber (13) is provided in the top wall of the box body (1), a lower liquid collecting chamber (61) is provided in the plug disc (6), two ends of the spiral tube (4) are respectively connected to the upper liquid collecting chamber (13) and the lower liquid collecting chamber (61), the lower liquid collecting chamber (61) is connected to an external clean water inlet pipe through a pipe, and the upper liquid collecting chamber (13) is connected to an external clean water outlet pipe through the synchronous valve (2); The synchronous valve (2) comprises an upper ring shell (21) and a lower ring shell (22), an inner rubber tube (24) and an outer rubber tube (23) arranged inside and outside the upper ring shell (21) and the lower ring shell (22), the two ends of the inner rubber tube (24) penetrate to the end surfaces of the upper ring shell (21) and the lower ring shell (22) to form a central through cavity, the drainage end of the liquid pump (3) is connected to the central through cavity, an annular through cavity is formed between the inner rubber tube (24) and the outer rubber tube (23) and penetrates the inner cavities of the upper ring shell (21) and the lower ring shell (22) from top to bottom, the annular through cavity is covered on the outside of the central through cavity, an external clean water discharge pipe is connected to the inner cavity of the upper ring shell (21), and the upper liquid collecting cavity (13) is connected to the inner cavity of the lower ring shell (22); The inner rubber tube (24) and the outer rubber tube (23) are both made of a flexible rubber material. A plurality of return springs (25) are evenly distributed in an annular shape around the outer side of the outer rubber tube (23). Both ends of the return spring (25) are twisted and dislocated to connect the upper ring shell (21) and the lower ring shell (22). When the return spring (25) contracts and pulls the upper ring shell (21) and the lower ring shell (22) closer together, the inner rubber tube (24) and the outer rubber tube (23) are in a twisted state, so that the annular through cavity and the central through cavity are closed.

2. The chemical waste liquid waste heat recovery device according to claim 1, characterized in that: A plurality of groups of spiral tubes (4) are concentrically sleeved in the heat exchange chamber, and the spiral filtering gaps of the spiral tubes (4) gradually decrease from the inside to the outside.

3. The chemical waste liquid waste heat recovery device according to claim 2 is characterized in that: A plurality of groups of limiting rings (7) are concentrically arranged on the inner top surface of the box body (1) and the upper surface of the plug disc (6), an annular limiting groove is formed between each group of limiting rings (7), and both ends of the spiral tube (4) are adapted to be fixed in the annular limiting groove.

4. The chemical waste liquid waste heat recovery device according to claim 1, characterized in that: The plug disc (6) is slidably fitted with the inner wall of the box body (1), and a driving telescopic rod (5) is installed at the bottom of the box body (1). The driving telescopic rod (5) drives the plug disc (6) to move, so as to adjust the spiral filtering gap size of the spiral tube (4).

5. The chemical waste liquid waste heat recovery device according to claim 4, characterized in that: A pressure sensor (51) is provided at the connection portion between the driving telescopic rod (5) and the plug disc (6); a retaining ring (62) is fixed on the top of the plug disc (6) and is slidably fitted to the inner wall of the box body (1); a through hole (63) is provided on the surface of the retaining ring (62); a debris removal opening (12) is provided on the surface of the box body (1) below the waste discharge opening (11); the driving telescopic rod (5) drives the plug disc (6) to move up and down, so that the through hole (63) is selectively connected to the waste discharge opening (11) or the debris removal opening (12).

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