Sulfur dioxide gas cooling system for cane sugar refinery

Abstract

The utility model discloses a sulfur dioxide gas cooling system for a cane sugar factory, which comprises a cooling tower and a filter box, a gas inlet for introducing sulfur dioxide gas is arranged at the lower part of the cooling tower, a spray head group is arranged in the cooling tower above the gas inlet, and an exhaust port is arranged at the top of the cooling tower. The bottom of the cooling tower is connected with the filter box through a liquid passing pipe, the filter box is connected with the spray head set through a pumping pipe, a circulating pump and a return pipe, the inlet end of the circulating pump is connected with the filter box through the pumping pipe, and the outlet end of the circulating pump is connected with the spray head set through the return pipe. The pumping pipe is further connected with the bottom end of the cooling tower through a bypass pipe with the pipeline circulation resistance larger than that of the pumping pipe. The sulfur dioxide gas cooling system for the cane sugar refinery is reasonable and ingenious in structural arrangement, and automatic switching can be achieved without a full-automatic control electric appliance electromagnetic assembly.

Description

Technical Field

[0001] This utility model relates to the technical field of sugarcane sugar production equipment, specifically a sulfur dioxide gas cooling system for sugarcane sugar plants. Background Technology

[0002] In my country, sugarcane sugar production primarily utilizes the sulfite process to produce white sugar. During this process, food-grade sulfur is burned to provide sulfur dioxide gas, which serves as a clarifying and decolorizing agent. In existing technologies, the sulfur dioxide gas produced by the sulfur combustion furnace can reach temperatures of 350–1300 degrees Celsius (350–600 degrees Celsius for low-temperature combustion and 600–1300 degrees Celsius for high-temperature combustion). However, the sulfur dioxide used in subsequent processes is at a temperature of 70–80 degrees Celsius, necessitating cooling of the high-temperature sulfur dioxide gas. Traditional cooling methods employ shell-and-tube or tubular coolers, with the high-temperature sulfur dioxide gas flowing inside the tubes and cooling water flowing through the shell. However, the raw sulfur contains incompletely combusted sulfur particles and small amounts of inorganic matter, which easily form impurities after combustion. These impurities, if not cleaned promptly, can clog the cooling equipment. Furthermore, the high temperature of the sulfur dioxide gas as it enters the cooling tower can easily damage the gas inlet and cause equipment corrosion, leading to sulfur dioxide leakage and pollution.

[0003] To address this, some sugar mills have recently improved their existing sulfur dioxide coaxial or tubular cooler systems by introducing a high-temperature sulfur dioxide gas spray cooling system into the cooling tower. This primarily involves adding coolant circulation and replenishment devices, overcoming problems such as corrosion and system leakage in tubular coolers. A backup filter is also installed during circulation and replenishment; if the active filter becomes clogged, the backup filter is switched on. Manual switching requires constant monitoring by operators; automatic switching requires multiple electromagnetic components, resulting in high installation costs and corrosion issues in highly acidic environments. Corrosion failure of these components can prevent automatic switching, or operator negligence can lead to excessively high temperatures within the cooling tower, impacting subsequent processes and increasing the risk of safety accidents. Therefore, a high-temperature sulfur dioxide gas cooling system that can automatically switch sprays without requiring fully automated control of the solenoid valves is needed. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a sulfur dioxide gas cooling system for sugarcane sugar mills. This sulfur dioxide gas cooling system for sugarcane sugar mills has a reasonable and ingenious structure and can achieve automatic switching without the need for fully automatic control electrical and electromagnetic components.

[0005] This utility model is achieved using the following technical solution:

[0006] A sulfur dioxide gas cooling system for a sugarcane sugar refinery includes a cooling tower and a filter box. The lower part of the cooling tower has an inlet for introducing sulfur dioxide gas. A nozzle assembly is installed inside the cooling tower above the inlet. An exhaust port is located at the top of the cooling tower. The bottom of the cooling tower is connected to the filter box via a liquid-passing pipe. The filter box is connected to the nozzle assembly via a pumping pipe, a circulating pump, and a return pipe. The inlet of the circulating pump is connected to the filter box via the pumping pipe, and the outlet of the circulating pump is connected to the nozzle assembly via the return pipe. The pumping pipe is also connected to the bottom of the cooling tower via a bypass pipe with a flow resistance greater than that of the pumping pipe itself. In this design, the diameter of the pumping pipe can be larger than that of the bypass pipe, with the diameters of both pipes designed to allow most of the working water to be drawn by the circulating pump through the pumping pipe, while only water drawn from the bypass pipe is needed for cooling tower spraying. Alternatively, the pumping pipe and bypass pipe can be of the same diameter, with a flow-blocking device installed on the bypass pipe. The flow obstruction device uses flow regulating valves, necked connecting pipes (connecting pipes with a small middle section and large ends), etc. There are no restrictions on the structure of the flow obstruction device, as long as it meets the requirement that most of the working water drawn by the circulating pump is drawn through the pumping pipe, and when drawn from the side pipe, it meets the requirements for cooling tower spraying. The length of the side pipe can also be increased and multiple elbows can be installed on it to increase its flow resistance.

[0007] A further preferred embodiment: a filter screen is provided at the upper inner end of the filter box, a liquid flow pipe is connected to the lower end of the filter box, and a pumping pipe is connected to the filter box above the filter screen.

[0008] A further preferred embodiment: the lower part of the cooling tower is equipped with a water supply pipe to replenish water to the filter box and maintain it at a certain water level.

[0009] A further preferred embodiment: a three-way valve or a straight-through valve is installed on the liquid passage pipe; when a straight-through valve is installed on the liquid passage pipe, a drain pipe is connected to the top of the filter box, and a drain valve is installed on the drain pipe; when a three-way valve is installed on the liquid passage pipe, the three-way valve is connected to the drain pipe, one end of the drain pipe is connected to the three-way valve, and the other end of the drain pipe extends upwards above the liquid level of the cooling tower. The design of the drain pipe facilitates the flow of water into the filter box.

[0010] A further preferred embodiment includes a slag discharge pipe connected to the bottom of the filter box, on which a slag discharge pump and a slag discharge safety valve are installed. To achieve automatic slag discharge control, an automatic slag discharge valve is also installed on the slag discharge pipe. When automatic slag discharge is set, the slag discharge safety valve is normally open, and the system controller automatically controls the slag discharge pump and the automatic slag discharge valve according to the set program to achieve automatic slag discharge.

[0011] A further preferred embodiment includes: a No. 1 circulating pump, a No. 1 return pipe, a No. 1 nozzle assembly, a No. 1 bypass pipe, and a No. 1 extraction pipe. The inlet end of the No. 1 circulating pump is connected to the filter box via the No. 1 extraction pipe, and the outlet end of the No. 1 circulating pump is connected to the No. 1 nozzle assembly via the No. 1 return pipe. The No. 1 extraction pipe is also connected to the bottom end of the cooling tower via the No. 1 bypass pipe. For ease of inspection and maintenance, a No. 1 switch valve is installed on the No. 1 bypass pipe, and a No. 1 extraction valve is installed on the No. 1 extraction pipe.

[0012] A further preferred embodiment: In order to reduce the amount of impurities pumped back to the cooling tower, a filter box is also installed on the No. 1 side pipe.

[0013] A further preferred embodiment includes: a second circulating pump, a second return pipe, a second nozzle assembly, a second bypass pipe, and a second extraction pipe. The inlet of the second circulating pump is connected to the filter box via the second extraction pipe, and the outlet of the second circulating pump is connected to the second nozzle assembly via the second return pipe. The second extraction pipe is also connected to the bottom of the cooling tower via the second bypass pipe. For ease of maintenance, a second switching valve is installed on the second bypass pipe, and a second extraction valve is installed on the second extraction pipe. Two return pipes are provided at the filter box, serving as a backup or allowing simultaneous use of both.

[0014] A further preferred embodiment: To reduce impurities being pumped back to the cooling tower, a second filter box is also installed on the second bypass pipe. Filter boxes one and two can be configured as filter boxes connected to the liquid flow pipe, or other structures can be used, as long as they meet the requirements for filtration of the returned liquid. The filtration capacity settings of filter boxes one and two need to ensure that even when filter blockage occurs, filter boxes one and two can continue to operate for a period of time, avoiding a situation where both fail to operate simultaneously.

[0015] The sulfur dioxide gas cooling system in this sugarcane refinery has a reasonable and ingenious structure. The bottom of the cooling tower is connected to the filter box via a liquid-passing pipe. The filter box is connected to the nozzle assembly via a pumping pipe, a circulating pump, and a return pipe. The inlet of the circulating pump is connected to the filter box via the pumping pipe, and the outlet of the circulating pump is connected to the nozzle assembly via the return pipe. The pumping pipe is also connected to the bottom of the cooling tower via a bypass pipe, and the diameter of the pumping pipe is larger than that of the bypass pipe. Due to the pressure difference between the pumping pipe and the bypass pipe, normal operation involves passing water from the cooling tower into the filter box via the liquid-passing pipe for filtration, and then circulating the water through the pumping pipe, the circulating pump, and the return pipe. The water is pumped into the cooling tower and sprayed through nozzles to wash and cool the sulfur dioxide entering the cooling tower. During the pumping process, most of the water is drawn from the filter box, and a small amount of water may be pumped from the bottom of the cooling tower. When the filter screen in the filter box becomes clogged and there is insufficient water supply, the pumping pressure of the circulating pump increases, and the water in the cooling tower is pumped into the cooling tower through the side pipe by the circulating pump and the return pipe for washing and cooling. Automatic switching can be achieved without fully automatic control of electrical and electromagnetic components, ensuring that sufficient water is returned to the cooling tower to wash and cool the sulfur dioxide. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the layout structure of the sulfur dioxide gas cooling system in the sugarcane sugar mill in Example 2;

[0017] Figure 2 This is a schematic diagram of the layout structure of the sulfur dioxide gas cooling system in the sugarcane sugar mill in Example 3;

[0018] The component names corresponding to the serial numbers in the diagram are:

[0019] 1. Slag discharge safety valve; 2. Slag discharge pump; 3. Slag discharge pipe; 4. Automatic slag discharge valve; 5. No. 1 circulating pump; 6. No. 1 extraction pipe; 7. No. 1 extraction valve; 8. No. 1 bypass pipe; 9. No. 1 return pipe; 10. No. 1 switch valve; 11. Water supply pipe; 12. Air inlet; 13. Cooling tower; 14. No. 1 nozzle group; 15. No. 2 nozzle group; 16. Exhaust port; 17. No. 2 return pipe; 18. No. 2 switch valve; 19. No. 2 bypass pipe; 20. No. 2 circulating pump; 21. No. 2 extraction valve; 22. No. 2 extraction pipe; 23. Filter box; 24. Filter screen; 25. Liquid passage pipe; 26. Three-way valve; 27. Straight-through valve; 28. Drain pipe; 29. ​​Drain valve; 30. Filter box one; 31. Filter box two. Detailed Implementation

[0020] The technical solutions of the invention will be clearly and completely described below with reference to the embodiments. The described embodiments are only a part of the present utility model, and not all of the embodiments. Example 1

[0021] A sulfur dioxide gas cooling system for a sugarcane sugar refinery includes a cooling tower 13 and a filter box 23. The lower part of the cooling tower 13 has an inlet 12 for introducing sulfur dioxide gas. A nozzle assembly is installed inside the cooling tower 13 above the inlet 12. An exhaust port 16 is located at the top of the cooling tower 13. The bottom of the cooling tower 13 is connected to the filter box 23 via a liquid pipe 25. The filter box 23 is connected to the nozzle assembly via a pumping pipe, a circulating pump, and a return pipe. The inlet of the circulating pump is connected to the filter box 23 via the pumping pipe, and the outlet of the circulating pump is connected to the nozzle assembly via the return pipe. The pumping pipe is also connected to the bottom of the cooling tower 13 via a bypass pipe. The flow resistance of the bypass pipe is greater than that of the pumping pipe, and the design method uses a pumping pipe with a diameter larger than that of the bypass pipe.

[0022] The filter box 23 is provided with a filter screen 24 at its upper inner end, a liquid pipe 25 is connected to the lower end of the filter box 23, and a pumping pipe is connected to the filter box 23 above the filter screen 24.

[0023] A water supply pipe 11 is provided at the lower part of the cooling tower 13.

[0024] A straight-through valve 27 is installed on the liquid inlet pipe 25. A drain pipe 28 is connected to the top of the filter box 23, and a drain valve 29 is installed on the drain pipe 28.

[0025] The bottom of the filter box 23 is connected to a slag discharge pipe 3, and a slag discharge pump 2 and a slag discharge safety valve 1 are installed on the slag discharge pipe 3; in order to realize automatic control of slag discharge, an automatic slag discharge valve 4 is also installed on the slag discharge pipe 3.

[0026] The circulating pump includes a first circulating pump 5, a return pipe includes a first return pipe 9, a nozzle assembly includes a first nozzle assembly 14, a bypass pipe includes a first bypass pipe 8, and a delivery pipe includes a first delivery pipe 6. The inlet end of the first circulating pump 5 is connected to the filter box 23 through the first delivery pipe 6, and the outlet end of the first circulating pump 5 is connected to the first nozzle assembly 14 through the first return pipe 9. The first delivery pipe 6 is also connected to the bottom end of the cooling tower 13 through the first bypass pipe 8. For convenient inspection and maintenance, a first switch valve 10 is installed on the first bypass pipe 8, and a first delivery valve 7 is installed on the first delivery pipe 6.

[0027] In order to reduce the amount of impurities pumped back to the cooling tower 13, a filter box 30 is also installed on the first side pipe 8. Example 2

[0028] A sulfur dioxide gas cooling system for a sugarcane sugar refinery includes a cooling tower 13 and a filter box 23. The lower part of the cooling tower 13 has an inlet 12 for introducing sulfur dioxide gas. A nozzle assembly is installed inside the cooling tower 13 above the inlet 12. An exhaust port 16 is located at the top of the cooling tower 13. The bottom of the cooling tower 13 is connected to the filter box 23 via a liquid pipe 25. The filter box 23 is connected to the nozzle assembly via a pumping pipe, a circulating pump, and a return pipe. The inlet of the circulating pump is connected to the filter box 23 via the pumping pipe, and the outlet of the circulating pump is connected to the nozzle assembly via the return pipe. The pumping pipe is also connected to the bottom of the cooling tower 13 via a bypass pipe. The flow resistance of the bypass pipe is greater than that of the pumping pipe, and the design method uses a pumping pipe with a diameter larger than that of the bypass pipe.

[0029] The filter box 23 is provided with a filter screen 24 at its upper inner end, a liquid pipe 25 is connected to the lower end of the filter box 23, and a pumping pipe is connected to the filter box 23 above the filter screen 24.

[0030] A water supply pipe 11 is provided at the lower part of the cooling tower 13.

[0031] A three-way valve 26 is installed on the liquid inlet pipe 25. The three-way valve 26 is connected to a drain pipe 28. One end of the drain pipe 28 is connected to the three-way valve 26, and the other end of the drain pipe 28 extends upward above the liquid level of the cooling tower 13.

[0032] The bottom of the filter box 23 is connected to a slag discharge pipe 3, and a slag discharge pump 2 and a slag discharge safety valve 1 are installed on the slag discharge pipe 3; in order to realize automatic control of slag discharge, an automatic slag discharge valve 4 is also installed on the slag discharge pipe 3.

[0033] The circulating pump includes a first circulating pump 5, a return pipe includes a first return pipe 9, a nozzle assembly includes a first nozzle assembly 14, a bypass pipe includes a first bypass pipe 8, and a delivery pipe includes a first delivery pipe 6. The inlet end of the first circulating pump 5 is connected to the filter box 23 through the first delivery pipe 6, and the outlet end of the first circulating pump 5 is connected to the first nozzle assembly 14 through the first return pipe 9. The first delivery pipe 6 is also connected to the bottom end of the cooling tower 13 through the first bypass pipe 8. For convenient inspection and maintenance, a first switch valve 10 is installed on the first bypass pipe 8, and a first delivery valve 7 is installed on the first delivery pipe 6.

[0034] In order to reduce the amount of impurities pumped back to the cooling tower 13, a filter box 30 is also installed on the first side pipe 8. Example 3

[0035] The difference from Embodiment 1 or Embodiment 2 is that: the circulating pump also includes a second circulating pump 20, the return pipe also includes a second return pipe 17, the nozzle group also includes a second nozzle group 15, the bypass pipe also includes a second bypass pipe 19, and the extraction pipe also includes a second extraction pipe 22. The inlet end of the second circulating pump 20 is connected to the filter box 23 through the second extraction pipe 22, and the outlet end of the second circulating pump 20 is connected to the second nozzle group 15 through the second return pipe 17. The second extraction pipe 22 is also connected to the bottom end of the cooling tower 13 through the second bypass pipe 19. For convenient inspection and maintenance, a second switching valve 18 is installed on the second bypass pipe 19, and a second extraction valve 21 is installed on the second extraction pipe 22.

[0036] To reduce the amount of impurities pumped back to cooling tower 13, a second filter box 31 is also installed on the second bypass pipe 19. The first filter box 30 and the second filter box 31 can adopt the structure of the filter box 24 connected to the liquid flow pipe 25, or other structures can be used, as long as they meet the requirements for filtration of the liquid returning to the pump.

[0037] The above description is not intended to limit the present utility model, nor is the present utility model limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should be protected by the present utility model.

Claims

1. A sulfur dioxide gas cooling system for a sugarcane sugar refinery, comprising a cooling tower (13) and a filter box (23), wherein the lower part of the cooling tower (13) is provided with an inlet (12) for introducing sulfur dioxide gas, a nozzle assembly is installed inside the cooling tower (13) above the inlet (12), and an exhaust port (16) is provided at the top of the cooling tower (13), characterized in that: The bottom of the cooling tower (13) is connected to the filter box (23) via a liquid pipe (25). The filter box (23) is connected to the nozzle assembly via a pumping pipe, a circulating pump, and a return pipe. The inlet end of the circulating pump is connected to the filter box (23) via a pumping pipe, and the outlet end of the circulating pump is connected to the nozzle assembly via a return pipe. The pumping pipe is also connected to the bottom end of the cooling tower (13) via a bypass pipe with a flow resistance greater than that of the pumping pipe.

2. The sulfur dioxide gas cooling system for a sugarcane refinery according to claim 1, characterized in that: The diameter of the bypass pipe is smaller than that of the extraction pipe, or a flow-blocking device is installed on the bypass pipe.

3. The sulfur dioxide gas cooling system for a sugarcane refinery according to claim 1, characterized in that: The filter box (23) is provided with a filter screen (24) at the upper inner end, the liquid pipe (25) is connected to the lower end of the filter box (23), and the pumping pipe is connected to the filter box (23) above the filter screen (24).

4. The sulfur dioxide gas cooling system for a sugarcane refinery according to claim 1, characterized in that: A three-way valve (26) or a straight valve (27) is installed on the liquid passage pipe (25); when a straight valve (27) is installed on the liquid passage pipe (25), an empty pipe (28) is connected to the top of the filter box (23), and an empty valve (29) is installed on the empty pipe (28); when a three-way valve (26) is installed on the liquid passage pipe (25), the three-way valve (26) is connected to the empty pipe (28), one end of the empty pipe (28) is connected to the three-way valve (26), and the other end of the empty pipe (28) extends upward above the liquid level of the cooling tower (13).

5. The sulfur dioxide gas cooling system for a sugarcane refinery according to claim 1 or 4, characterized in that: The bottom of the filter box (23) is connected to a slag discharge pipe (3), and a slag discharge pump (2) and a slag discharge safety valve (1) are installed on the slag discharge pipe (3).

6. The sulfur dioxide gas cooling system for a sugarcane refinery according to claim 1, characterized in that: The circulating pump includes a first circulating pump (5), the return pipe includes a first return pipe (9), the nozzle group includes a first nozzle group (14), the bypass pipe includes a first bypass pipe (8), and the extraction pipe includes a first extraction pipe (6). The inlet end of the first circulating pump (5) is connected to the filter box (23) through the first extraction pipe (6), the outlet end of the first circulating pump (5) is connected to the first nozzle group (14) through the first return pipe (9), and the first extraction pipe (6) is also connected to the bottom end of the cooling tower (13) through the first bypass pipe (8).

7. The sulfur dioxide gas cooling system for a sugarcane refinery according to claim 6, characterized in that: A filter box (30) is also installed on the No. 1 side pipe (8).

8. The sulfur dioxide gas cooling system for a sugarcane refinery according to claim 6, characterized in that: The circulating pump also includes a second circulating pump (20), the return pipe also includes a second return pipe (17), the nozzle group also includes a second nozzle group (15), the bypass pipe also includes a second bypass pipe (19), the extraction pipe also includes a second extraction pipe (22), the inlet end of the second circulating pump (20) is connected to the filter box (23) through the second extraction pipe (22), the outlet end of the second circulating pump (20) is connected to the second nozzle group (15) through the second return pipe (17), and the second extraction pipe (22) is also connected to the bottom end of the cooling tower (13) through the second bypass pipe (19).

9. The sulfur dioxide gas cooling system for a sugarcane refinery according to claim 8, characterized in that: The second side pipe (19) is also equipped with a filter box (31).

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