Waste heat utilization device of sodium carbonate production system

Abstract

The utility model relates to a waste heat utilization device of a sodium carbonate production system in the technical field of waste heat recovery in the sodium carbonate industry. According to the cleaning device, the motor is arranged and drives the first full gear and the second full gear to rotate, then the first half gear and the second half gear are driven to rotate, the rack is driven to move, the cleaning roller is driven to horizontally move in a reciprocating mode, the heat exchange metal pipe is cleaned, scale on the surface of the heat exchange metal pipe can be removed, the surface is kept clean, and corrosion and abrasion are prevented; and the waste heat recovery efficiency is improved, and the cleaning and maintenance time and money cost are reduced. And the water storage tank is arranged, heat energy can be stored, heat output can be balanced and stabilized, it is ensured that heat cannot be wasted, and the waste heat recovery efficiency is improved. A large amount of low-temperature waste heat of a sodium carbonate production system is used for heating calcium chloride raw material liquid, finished calcium chloride is prepared through sodium filtration, evaporation and crystallization, the quality and yield of the calcium chloride product are improved, the salt content of the calcium chloride finished product is reduced, and meanwhile steam consumption in the calcium chloride production process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery in soda ash industry, in particular to a waste heat utilization device for a soda ash production system. Background Art

[0002] In the process of soda ash production, waste liquid containing a large amount of low-temperature heat energy will be generated. If the heat energy in these waste liquids can be recovered, it can improve the overall energy utilization efficiency, reduce production costs, and reduce greenhouse gas emissions. In the chemical industry, the production of soda ash and calcium chloride are often accompanied. If the waste heat from soda ash production can be used for calcium chloride production, it will have huge economic benefits. However, there are some difficulties in the recovery of waste heat: the waste heat is a large amount of low-temperature waste heat, which is difficult to recover and difficult to combine with the calcium chloride production process; the temperature of the waste heat generated during the production process may fluctuate, resulting in unstable efficiency and output of heat recovery, which is easy to affect the stable operation of downstream processes. In addition, waste liquid is easy to scale on the heat exchange tubes, and scale is a substance with low thermal conductivity, which will affect heat exchange and reduce the efficiency of waste heat recovery. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a waste heat utilization device for a soda ash production system.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a waste heat utilization device of a soda ash production system, comprising a heat exchange body, a fixed frame fixedly connected to the heat exchange body, a motor fixedly connected to the fixed frame, a full gear 1 fixedly connected to the output end of the motor, a half gear 1 fixedly connected to the bottom of the full gear 1, the full gear 1 meshingly connected to the full gear 2, the bottom of the full gear 2 fixedly connected to the half gear 2, the half gear 1 and the half gear 2 are respectively meshingly connected to racks, the full gear 2 and the half gear 2 are also fixedly connected to a rotating shaft, the rotating shaft rotates on the surface of the heat exchange body, a connecting plate is fixedly connected to one side of the rack, a plurality of cleaning rollers are fixedly connected to the bottom of the connecting plate, a heat exchange metal pipe is fixedly connected to the inside of the heat exchange body, the cleaning rollers are arranged on both sides of the heat exchange metal pipe, one end of the heat exchange metal pipe is connected to a water pump 1 through a water pipe, the end of the water pump 1 away from the heat exchange body is fixedly connected to a waste liquid inlet pipe, and the end of the heat exchange metal pipe away from the water pump 1 is fixedly connected to a waste liquid outlet pipe.

[0005] As a further description of the above technical solution:

[0006] A cold water inlet pipe is fixedly connected to the upper portion of one side of the heat exchange body, and a hot water outlet pipe is fixedly connected to the lower portion of the side of the heat exchange body away from the cold water inlet pipe.

[0007] As a further description of the above technical solution:

[0008] One end of the hot water outlet pipe away from the heat exchange body is fixedly connected to a second water pump, and a section of the second water pump away from the hot water outlet pipe is fixedly connected to a water storage tank.

[0009] As a further description of the above technical solution:

[0010] The water storage tank is connected with a calcium chloride raw material liquid storage tank.

[0011] As a further description of the above technical solution:

[0012] The calcium chloride raw material liquid storage tank is connected to a nanofiltration device.

[0013] As a further description of the above technical solution:

[0014] The nanofiltration device is communicated with the multiple-effect evaporation device.

[0015] As a further description of the above technical solution:

[0016] The multiple-effect evaporation device is connected to a crystallization device.

[0017] The utility model has the following beneficial effects:

[0018] 1. In the utility model, a motor is provided, which drives the full gear 1 and the full gear 2 to rotate, and then drives the half gear 1 and the half gear 2 to rotate and the rack to move, and drives the cleaning roller to move back and forth, so as to clean the heat exchange metal tube, thereby removing the scale on the surface of the heat exchange metal tube, keeping the surface clean, preventing corrosion and wear, improving the efficiency of waste heat recovery, and reducing the time and money cost of cleaning and maintenance;

[0019] 2. The utility model is provided with a water storage tank, which can store heat energy to balance and stabilize the heat output. When the water temperature in the water storage tank is low, the water is pumped back to the heat exchange body through the second water pump for reheating, ensuring that the heat will not be wasted and improving the efficiency of waste heat recovery;

[0020] 3. In the utility model, a large amount of low-temperature waste heat from the soda ash production system is used to heat the calcium chloride raw material liquid. The heated calcium chloride raw material liquid passes through a nanofiltration device to remove part of the sodium chloride therein, thereby increasing the calcium ion concentration of the raw material liquid and greatly increasing the calcium salt ratio in the raw material liquid. The raw material liquid is then passed through a multiple-effect evaporator and a crystallization device to produce a finished calcium chloride product. The quality and output of the calcium chloride product are improved, the salt content of the finished calcium chloride product is reduced, and the steam consumption in the calcium chloride production process can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1A three-dimensional diagram of a heat exchange body and a water storage tank of a waste heat utilization device of a soda ash production system proposed by the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of a heat exchange body of a waste heat utilization device of a soda ash production system proposed by the utility model;

[0023] Figure 3 This is a schematic diagram of a waste heat utilization device for a soda ash production system proposed by the utility model.

[0024] Legend:

[0025] 1. Heat exchange body; 2. Fixed frame; 3. Motor; 4. Full gear 1; 5. Half gear 1; 6. Full gear 2; 7. Half gear 2; 8. Rack; 9. Rotating shaft; 10. Connecting plate; 11. Cleaning roller; 12. Heat exchange metal pipe; 13. Water pump 1; 14. Waste liquid inlet pipe; 15. Waste liquid outlet pipe; 16. Cold water inlet pipe; 17. Hot water outlet pipe; 18. Water pump 2; 19. Water storage tank; 20. Calcium chloride raw liquid storage tank; 21. Nanofiltration device; 22. Multi-effect evaporation device; 23. Crystallization device. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Reference Figure 1-3The utility model provides an embodiment: a waste heat utilization device of a soda ash production system, comprising a heat exchange body 1, the heat exchange body 1 is used for heat exchange of waste heat of the soda ash production system, the heat exchange body 1 is fixedly connected with a fixing frame 2, the fixing frame 2 is fixedly connected with a motor 3, the output end of the motor 3 is fixedly connected with a full gear 1 4, the bottom of the full gear 1 4 is fixedly connected with a half gear 1 5, the full gear 1 4 is meshedly connected with a full gear 2 6, the bottom of the full gear 2 6 is fixedly connected with a half gear 2 7, the half gear 1 5 and the half gear 2 7 are respectively meshed with a rack 8, the full gear 2 6 and the half gear 2 7 are also fixedly connected with a rotating shaft 9, the rotating shaft 9 is fixedly connected to the heat exchange body 1 rotates, one side of the rack 8 is fixedly connected with a connecting plate 10, the bottom of the connecting plate 10 is fixedly connected with a plurality of cleaning rollers 11, the inside of the heat exchange body 1 is fixedly connected with a heat exchange metal tube 12, the cleaning rollers 11 are used to clean the heat exchange metal tube 12, the cleaning rollers 11 are arranged on both sides of the heat exchange metal tube 12, one end of the heat exchange metal tube 12 is connected with a water pump 13 through a water pipe, the water pump 13 draws the waste liquid containing residual heat generated by the soda ash production system into the heat exchange body 1, the end of the water pump 13 away from the heat exchange body 1 is fixedly connected with a waste liquid inlet pipe 14, and the end of the heat exchange metal tube 12 away from the water pump 13 is fixedly connected with a waste liquid outlet pipe 15.

[0028] A cold water inlet pipe 16 is fixedly connected to the upper portion of one side of the heat exchange body 1 , and a hot water outlet pipe 17 is fixedly connected to the lower portion of the side of the heat exchange body 1 away from the cold water inlet pipe 16 .

[0029] One end of the hot water outlet pipe 17 away from the heat exchange body 1 is fixedly connected to a water pump 18, and a section of the water pump 18 away from the hot water outlet pipe 17 is fixedly connected to a water storage tank 19. The water pump 18 pumps the heated water into the water storage tank 19, and when the water temperature in the water storage tank 19 is too low, the water is pumped back to the heat exchange body 1.

[0030] The water storage tank 19 is connected to a calcium chloride raw material liquid storage tank 20, and the calcium chloride raw material liquid storage tank 20 is used to store the calcium chloride raw material liquid.

[0031] The calcium chloride raw material liquid storage tank 20 is connected to a nanofiltration device 21, and the nanofiltration device 21 filters the heated calcium chloride raw material liquid to remove part of the sodium chloride therein and increase the calcium ion concentration of the raw material liquid.

[0032] The nanofiltration device 21 is connected to the multi-effect evaporation device 22, and the multi-effect evaporation device 22 is used to evaporate the filtered calcium chloride raw material liquid.

[0033] The multiple-effect evaporator 22 is connected to a crystallizer 23 , and the evaporated calcium chloride raw material liquid is crystallized in the crystallizer 23 .

[0034] Working principle: when it is necessary to clean the scale, the operator starts the motor 3, and the motor 3 drives the full gear 1 4 and the full gear 2 6 to rotate, and then drives the half gear 1 5 and the half gear 2 7 to rotate. When the half gear 1 5 is engaged with the rack 8, it drives the rack 8 to translate, and then when the half gear 2 7 rotates to engage with the rack 8, it drives the rack 8 to translate in the opposite direction. The rack 8 then drives the cleaning roller 11 to translate back and forth, so that the dynamic cleaning roller 11 can reciprocate and clean the heat exchange metal tube 12, thereby removing the scale on the surface of the heat exchange metal tube 12 and keeping the surface clean.

[0035] The waste liquid generated by the soda ash production system first flows into the waste liquid inlet pipe 14, and is pumped into the heat exchange metal pipe 12 through the water pump 13. Cold water enters the heat exchange body 1 from the cold water inlet pipe 16, and the waste liquid and the cold water perform heat exchange. The waste liquid leaves from the waste liquid outlet pipe 15, and the hot water leaves from the hot water outlet pipe 17. The hot water is pumped into the water storage tank 19 for storage through the water pump 2 18. The hot water in the water storage tank 19 is used to heat the calcium chloride raw liquid storage tank 20. The heated calcium chloride raw liquid passes through the nanofiltration device 21 to remove part of the sodium chloride therein, increase the calcium ion concentration of the raw liquid, and greatly increase the calcium salt ratio in the raw liquid. The raw liquid passes through the multi-effect evaporator 22 and the crystallizer 23 to produce the finished calcium chloride. The quality and output of the calcium chloride product are improved, the salt content of the finished calcium chloride product is reduced, and the steam consumption in the calcium chloride production process can also be reduced.

[0036] When the water temperature in the water storage tank 19 is low, the operator pumps the water back to the heat exchange body 1 through the water pump 18 for reheating, ensuring that the heat will not be wasted and improving the efficiency of waste heat recovery.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste heat utilization device for a soda ash production system, comprising a heat exchange body (1), characterized in that: The heat exchange body (1) is fixedly connected to a fixing frame (2), the fixing frame (2) is fixedly connected to a motor (3), the output end of the motor (3) is fixedly connected to a full gear 1 (4), the bottom of the full gear 1 (4) is fixedly connected to a half gear 1 (5), the full gear 1 (4) is meshingly connected to a full gear 2 (6), the bottom of the full gear 2 (6) is fixedly connected to a half gear 2 (7), the half gear 1 (5) and the half gear 2 (7) are respectively meshingly connected to a rack (8), the full gear 2 (6) and the half gear 2 (7) are also fixedly connected to a rotating shaft (9), the rotating shaft (9) is arranged on the heat exchange body (1) ) is rotated on the surface of the heat exchange body (1), one side of the rack (8) is fixedly connected to a connecting plate (10), the bottom of the connecting plate (10) is fixedly connected to a plurality of cleaning rollers (11), the interior of the heat exchange body (1) is fixedly connected to a heat exchange metal tube (12), the cleaning rollers (11) are arranged on both sides of the heat exchange metal tube (12), one end of the heat exchange metal tube (12) is connected to a water pump (13) through a water pipe, the end of the water pump (13) away from the heat exchange body (1) is fixedly connected to a waste liquid inlet pipe (14), and the end of the heat exchange metal tube (12) away from the water pump (13) is fixedly connected to a waste liquid outlet pipe (15).

2. The waste heat utilization device of a soda ash production system according to claim 1, characterized in that: A cold water inlet pipe (16) is fixedly connected to the upper portion of one side of the heat exchange body (1), and a hot water outlet pipe (17) is fixedly connected to the lower portion of the side of the heat exchange body (1) away from the cold water inlet pipe (16).

3. The waste heat utilization device of a soda ash production system according to claim 2, characterized in that: One end of the hot water outlet pipe (17) away from the heat exchange body (1) is fixedly connected to a second water pump (18), and a section of the second water pump (18) away from the hot water outlet pipe (17) is fixedly connected to a water storage tank (19).

4. The waste heat utilization device of a soda ash production system according to claim 3, characterized in that: The water storage tank (19) is connected to a calcium chloride raw material liquid storage tank (20).

5. The waste heat utilization device of a soda ash production system according to claim 4, characterized in that: The calcium chloride raw material liquid storage tank (20) is connected to a nanofiltration device (21).

6. The waste heat utilization device of a soda ash production system according to claim 5, characterized in that: The nanofiltration device (21) is connected to the multiple-effect evaporation device (22).

7. The waste heat utilization device of a soda ash production system according to claim 6, characterized in that: The multiple-effect evaporation device (22) is connected to a crystallization device (23).

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