CN216963571U - System for recovering acetylene gas in waste sodium hypochlorite solution - Google Patents
System for recovering acetylene gas in waste sodium hypochlorite solution Download PDFInfo
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- CN216963571U CN216963571U CN202221466059.6U CN202221466059U CN216963571U CN 216963571 U CN216963571 U CN 216963571U CN 202221466059 U CN202221466059 U CN 202221466059U CN 216963571 U CN216963571 U CN 216963571U
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Abstract
The utility model discloses a system for recovering acetylene gas in a waste sodium hypochlorite solution, which comprises a feeding adjusting device, a preheating device, a flash tank, a tail gas cooling device and a vacuumizing device, wherein the feeding adjusting device is connected with the preheating device; a plurality of baffle plates are arranged in the flash tank, and a bubbling device is arranged at the lower part in the flash tank. After entering a system, the waste sodium hypochlorite solution sequentially passes through a feeding adjusting device and a preheating device and then enters a flash tank from an upper liquid inlet, the waste sodium hypochlorite solution is recovered in the flash tank and then divided into two paths, and a gas phase is output from the top of the flash tank and then sequentially passes through a tail gas cooling device and a vacuumizing device and then enters a subsequent treatment system; and discharging the liquid phase through a liquid outlet pipe at the bottom of the flash tank, and allowing the liquid phase to enter a subsequent compounding system. According to the utility model, the gas-liquid separation efficiency is improved by increasing disturbance, prolonging the retention time of the waste sodium hypochlorite in the flash tank and reducing the acetylene solubility, so that not only can the acetylene gas be recovered efficiently, but also the recycling of the sodium hypochlorite solution can be promoted, the water resource can be saved, and meanwhile, the potential safety hazard of compounding the sodium hypochlorite solution can be reduced.
Description
Technical Field
The utility model relates to the technical field of acetylene gas purification systems, in particular to a system for recovering acetylene gas in a waste sodium hypochlorite solution.
Background
In the acetylene cleaning process, sodium hypochlorite with the effective chlorine content of 0.08-0.12 percent is generally used for washing crude acetylene produced by a calcium carbide method to remove PH contained in the acetylene3And H2S and other impurities, when the mass fraction of the effective chlorine content is reduced to 0.06%, the sodium hypochlorite loses the impurity removal capability, and the sodium hypochlorite solution which is invalid is called waste sodium hypochlorite solution.
The waste sodium hypochlorite solution has complex components, each parameter is far higher than the discharge index, and the waste sodium hypochlorite solution needs to be recovered and treated in time. The most widely applied mode in the industry at present is to adopt a negative pressure recovery process, recover acetylene gas in the waste sodium hypochlorite solution through vacuum flash evaporation, and compound the treated waste sodium hypochlorite solution with a sodium hypochlorite solution with higher concentration to form a sodium hypochlorite solution with the effective chlorine content of 0.08-0.12% by mass, and then enter a system for recycling.
More acetylene gas is dissolved in the waste sodium hypochlorite solution generated after washing, the traditional flash evaporation equipment is only a common flash evaporation tank, the retention time of liquid in the tank is short, and the effect of removing the acetylene gas is difficult to achieve under the negative pressure condition. If the acetylene gas dissolved in the waste sodium hypochlorite solution is too much, violent reaction and even explosion are easy to occur when the waste sodium hypochlorite solution is compounded with the concentrated sodium hypochlorite solution.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems, the utility model provides the device for recovering the acetylene gas from the waste sodium hypochlorite solution, which prolongs the retention time of the waste sodium hypochlorite solution in the flash tank, improves the effect of recovering the acetylene gas from the waste sodium hypochlorite solution by combining the modes of increasing disturbance, reducing the solubility of the acetylene and the like, and reduces the potential safety hazard of recycling the sodium hypochlorite solution.
The technical scheme adopted for realizing the purpose of the utility model is as follows:
the system for recovering the acetylene gas in the waste sodium hypochlorite solution comprises a feeding adjusting device; a preheating device; the flash tank is used for recovering acetylene gas, a plurality of baffle plates are arranged in the flash tank, and a bubbling device is arranged at the lower part in the flash tank; the tail gas cooling device is used for cooling and removing water vapor in a gas phase; and a vacuum extractor;
after entering a system, the waste sodium hypochlorite solution sequentially passes through a feeding adjusting device and a preheating device and then enters a flash tank from a liquid inlet at the upper part of the flash tank, the waste sodium hypochlorite solution is recovered in the flash tank and then is divided into two paths, and one path of gas phase is output from the top of the flash tank, sequentially passes through a tail gas cooling device and a vacuumizing device and then enters a subsequent treatment system; and the other path of liquid phase is discharged through a liquid outlet pipe at the bottom of the flash tank and enters a subsequent compounding system.
In one aspect of the present invention, there is provided,
in the technical scheme, the plurality of baffle plates are arranged in the flash tank in a staggered manner from top to bottom, and the overflow ends of the baffle plates are provided with overflow weirs. The baffles may be of horizontal or inclined downward slope design, optionally extending downward at an angle of 15 ° to the horizontal. The waste sodium hypochlorite solution is output from the liquid inlet to the baffle plate, and the waste sodium hypochlorite solution is baffled in a reciprocating way to prolong the retention time of the waste sodium hypochlorite solution and increase the disturbance. After the deflection, the waste sodium hypochlorite solution is accumulated in the lower part of the flash tank and in the area acted by the bubbling device.
It is worth noting that the baffle plate can prolong the retention time of the waste chlorous acid solution in the flash tank, but the design of the baffle plate with a downward inclined angle can increase the flow rate of the solution, and the larger the downward inclined angle is, the faster the flow rate of the solution is, so that the retention time of the solution in the flash tank can be shortened. Therefore, the size of the inclined downward angle of the baffle plate needs to be designed according to the solution property and the comprehensive consideration of parameters such as the vertical height and the cylinder diameter of the tank body.
In addition, in above-mentioned technical scheme, the feeding adjusting device include feed liquor pipe and buffer tank to set up the feeding control subassembly between feed liquor pipe and buffer tank, preferably, this feeding control subassembly includes feeding flowmeter and flow control valve. The liquid outlet pipe is provided with a liquid level adjusting component. The two phases of the feed control assembly and the liquid level regulating assembly are combined to regulate the flow of the solution entering and outputting the flash tank so as to prolong the retention time of the waste sodium hypochlorite solution in the flash tank.
In accordance with another aspect of the present invention,
in the above technical solution, the bubbling device includes an inlet pipe and a gas distributor; the gas distributor comprises a gas main pipe and a plurality of gas branch pipes communicated with the gas main pipe, and the lower parts of the gas branch pipes are provided with openings; optionally, a plurality of rows of small holes are obliquely formed at the lower part of the gas branch pipe, and an angle of 60 degrees is formed between the adjacent rows of small holes. The gas inlet pipe is communicated with a gas main pipe of the gas distributor, and the gas input by the gas inlet pipe is nitrogen or water vapor.
In the above technical scheme, a cyclone demister is arranged at the top of the flash tank. Nitrogen or water vapor enters the gas distributor from the gas inlet pipe and then emerges through the open pores of the gas distributor to generate bubbling, so that the disturbance of the waste sodium hypochlorite solution is increased, and the acetylene gas removal effect is improved. A large amount of acetylene gas enters a gas phase after being removed from a waste sodium hypochlorite solution, liquid drops carried in the gas phase are removed through a cyclone demister at the top of a flash tank and flow back to the system, and the residual gas phase acetylene gas is output through the top of the flash tank, is further cooled through a tail gas cooling device to remove water vapor in a gas phase, and is then conveyed to a subsequent system through a vacuumizing device for treatment.
In accordance with another aspect of the present invention,
the law of the solubility of acetylene in water as a function of temperature is shown in table 1, where the solubility is the volume of acetylene gas absorbed by a volume of water (reduced to the standard condition) at an acetylene gas partial pressure equal to 101.325 kPa. Therefore, the solubility of the acetylene gas in water is reduced along with the increase of the temperature, so that the temperature of the waste sodium hypochlorite solution is increased by the preheating device before entering the flash tank, and the acetylene gas removal effect can be improved.
In the above technical solution, the preheating device can adjust the temperature of the solution flowing through. The preheating device comprises a preheater, and a temperature adjusting component is arranged on the preheater. Optionally, the preheater is a spiral plate heat exchanger and the temperature adjustment assembly comprises a thermometer mounted on the material line exiting the heat exchanger and an adjustment valve mounted on the steam line entering the heat exchanger. The temperature of the solution in the flash tank can be monitored by observing a remote thermometer on the flash tank, and the temperature of the solution entering the flash tank is regulated by combining a preheating device.
Table 1 solubility of acetylene in water table
It should be noted that the preheating device provided in the present invention is intended to adjust the temperature of the waste sodium hypochlorite solution entering the flash tank, and to reduce the solubility of acetylene gas by increasing the temperature to improve the removal effect of acetylene gas, and other types of preheaters or technical solutions that change the installation manner of the temperature adjustment device are adopted and are within the protection scope of the present invention.
In accordance with another aspect of the present invention,
in the technical scheme, a manhole is arranged at the position, opposite to the baffle plate, on the side wall of the flash tank and/or at the bottom of the flash tank. The waste sodium hypochlorite often contains undissolved solid undissolved substances such as calcium hydroxide, silicon dioxide, calcium sulfide and the like, the baffle plate is provided with an overflow weir, and the inclined downward slope design can partially block a part of solids in the solution, so that the difficulty in flowing of the waste sodium hypochlorite solution due to excessive solid content is prevented. The manhole setting of combining the flash tank, the inside solid undissolved substance that stores up of cleaning equipment when convenient parking overhauls.
In conclusion, the beneficial effects of the utility model are as follows: through increasing disturbance, extension waste sodium hypochlorite dwell time in the flash tank, reduce the acetylene solubility and improve gas-liquid separation efficiency, can not only high-efficient recovery acetylene gas, can also promote sodium hypochlorite solution cycle use, water economy resource, reduced the complex potential safety hazard of sodium hypochlorite solution simultaneously.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 shows a schematic diagram of the system for recovering acetylene gas from a waste sodium hypochlorite solution according to the present invention;
FIG. 2 shows a schematic view of a flash tank configuration of the present invention;
FIG. 3A shows a schematic diagram of the gas distributor configuration within the flash tank of the present invention;
FIG. 3B shows a cross-sectional view of a gas manifold of the gas distributor of the present invention within a flash tank.
Wherein the figures include the following reference numerals: 10-a feeding adjusting device, 11-a liquid inlet pipe, 12-a buffer tank and 13-a feeding control component; 20-preheating device, 21-preheater and 22-temperature regulating component; 30-flash tank, 31-baffle plate, 311-overflow weir, 32-bubbling device, 321-gas inlet pipe, 322-gas distributor, 3221-gas main pipe, 3222-gas branch pipe, 33-liquid outlet pipe, 331-liquid level adjusting component, 34-cyclone demister, 35-liquid inlet and 36-manhole; 40-tail gas cooling device and 50-vacuumizing device.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
Example 1
As shown in fig. 1, the present embodiment provides a system for recovering acetylene gas from a waste sodium hypochlorite solution, which comprises a feed regulating device 10, which comprises a liquid inlet pipe 11, a buffer tank 12 and a feed control assembly 13; a preheating device 20 including a preheater 21, and the preheater 21 is provided with a temperature adjusting assembly 22; the flash tank 30 is used for recovering acetylene gas, a plurality of baffle plates 31 are arranged in the flash tank 30, and a bubbling device 32 is arranged at the lower part in the flash tank 30; a tail gas cooling device 40 for cooling the water vapor removed from the gas phase; and a vacuum pumping device 50.
The waste sodium hypochlorite solution after the acetylene cleaning process enters a buffer tank 12 through a liquid inlet pipe 11 to adjust the pH value. The feeding control component 13 in the feeding adjusting device 10 comprises a feeding flowmeter and a flow adjusting valve, and can adjust the solution flow entering the buffer tank and the solution flow of the acetylene gas recovery system in the whole waste sodium hypochlorite solution.
The spent sodium hypochlorite solution is discharged from the buffer tank and enters a preheating device 20, and the preheating device 20 can adjust the temperature of the solution flowing through. The preheater unit 20 includes a preheater 21, the preheater 21 being provided with a temperature regulating assembly 22 for monitoring the temperature of the solution in the flash tank 30 by observing a remote thermometer located on the flash tank 30, in conjunction with the preheater unit 20 for regulating the temperature of the solution entering the flash tank 30.
The waste sodium hypochlorite solution is preheated and then enters the flash tank 30 from a liquid inlet 35 at the upper part of the flash tank 30 for acetylene gas recovery. The recovered gas phase and liquid phase are divided into two paths and output from the flash tank 30. The gas phase is output from the top of the flash tank 30, further cooled by the tail gas cooling device 40 to remove water vapor in the gas phase, and enters a subsequent system for treatment after passing through the vacuum pumping device 50. The liquid phase solution is output through a liquid outlet pipe 33 at the bottom of the flash tank 30 and enters a subsequent compounding system.
Example 2
This example provides a system for recovering acetylene gas from a waste sodium hypochlorite solution, which has a structure identical to that of the recovery system of example 1, but employs a flash tank 30 as shown in fig. 2 for recovering acetylene gas. The present embodiment will explain the structure of the flash tank 30 in detail.
The baffle plates 31 in the flash tank 30 are arranged in a staggered mode from top to bottom, and overflow weirs 311 are arranged at the overflow ends of the baffle plates 31. The baffle 31 is designed to be in a horizontal or inclined downward slope, and the baffle 31 extends downwards at an angle of 15 degrees with the horizontal plane.
The pipe orifice of the liquid inlet 35 of the flash tank 30 extends inwards and is provided with a bent pipe, and the waste sodium hypochlorite solution is output from the liquid inlet 35 to the baffle plate 31 and accumulated at the lower part of the flash tank 30 after reciprocating baffle.
The sparging device 32 within the flash tank 30 comprises an inlet pipe 321 and a gas distributor 322. After being input from the air inlet pipe, nitrogen or water vapor is blown out from the gas distributor 322, bubbles are formed in the solution at the lower part of the flash tank 30, and the disturbance is increased to improve the acetylene gas removal effect.
A large amount of acetylene gas enters a gas phase after being removed from the waste sodium hypochlorite solution, liquid drops carried in the gas phase are removed through a cyclone demister 34 at the top of the flash tank 30 and flow back to the system, and the residual gas phase acetylene gas is output through the top of the flash tank 30, passes through a tail gas cooling device 40 and a vacuumizing device 50 and then enters a subsequent system for treatment. The liquid phase solution is output through a liquid outlet pipe 33 at the bottom of the flash tank 30 and enters a subsequent compounding system.
The liquid outlet pipe 33 is provided with a liquid level adjusting assembly 331, which can be combined with the feeding control assembly 13 in the feeding adjusting device 10 to adjust the flow rate of the solution entering and exiting the flash tank 30.
In addition, a manhole 36 is arranged on the side wall of the flash tank 30 at a position opposite to the baffle plate 31 and at the bottom of the flash tank 30, so that solid insoluble substances accumulated in the equipment can be cleaned conveniently during parking and maintenance.
Example 3
This example provides a system for recovering acetylene gas from waste sodium hypochlorite solution, which has a structure identical to that of the recovery system shown in example 2, but uses a gas distributor 322 in a flash tank 30 as shown in fig. 3A. The present embodiment describes the structure of the gas distributor 322 in detail.
Fig. 3A shows a top view of the gas distributor 322. The gas distributor 322 includes a gas main 3221 and a plurality of gas branch pipes 3222 communicated therewith. Optionally, the gas branch pipes 3222 are arranged at intervals on the gas main pipe 3221, and an included angle of 90 ° is formed therebetween.
Fig. 3B shows a cross-sectional view of the gas branch pipe 3222 of the gas distributor. The lower part of the gas branch pipe 3222 is provided with an opening. Optionally, a plurality of rows of small holes are obliquely formed at the lower part of the gas branch pipe 3222, and an angle of 60 ° is formed between adjacent rows of small holes.
The foregoing is a more detailed description of the present invention with reference to specific embodiments thereof, and it is not intended to limit the utility model to the specific embodiments thereof. It will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit of the utility model.
Claims (10)
1. A system for recovering acetylene gas in waste sodium hypochlorite solution is characterized by comprising:
a feed regulating device (10);
a preheating device (20);
a flash tank (30) for recovering acetylene gas; a plurality of baffle plates (31) are arranged in the flash tank (30), and a bubbling device (32) is arranged at the lower part in the flash tank (30);
a tail gas cooling device (40) for cooling water vapor removed from the gas phase;
a vacuum-pumping device (50);
the feeding adjusting device (10) is sequentially communicated with the preheating device (20) and the flash tank (30); the flash tank (30) is sequentially communicated with a tail gas cooling device (40) and a vacuumizing device (50) through a gas outlet hole at the top; a liquid outlet pipe (33) is arranged at the bottom of the flash tank (30).
2. The system for recovering acetylene gas from a waste sodium hypochlorite solution according to claim 1, wherein the baffles (31) are arranged from top to bottom in a staggered manner, and overflow weirs (311) are arranged at the overflow ends of the baffles (31).
3. The system for recovering acetylene gas from waste sodium hypochlorite solution according to claim 2, wherein the baffle (31) is designed to have a horizontal or inclined downward slope.
4. A system for recovering acetylene gas from a waste sodium hypochlorite solution according to claim 3, characterized in that the baffle (31) extends downward at an angle of 15 ° to the horizontal.
5. The system for recovering acetylene gas from a waste sodium hypochlorite solution according to claim 1, wherein the bubbling device (32) comprises an air inlet pipe (321) and a gas distributor (322); the gas distributor (322) comprises a gas main pipe (3221) and a plurality of gas branch pipes (3222) communicated with the gas main pipe; an opening is provided at the lower part of the gas branch pipe (3222).
6. The system for recovering acetylene gas from a waste sodium hypochlorite solution according to claim 5, wherein the lower part of the gas branch pipe (3222) is obliquely provided with a plurality of rows of small holes, and the angle between the adjacent rows of small holes is 60 degrees.
7. The system for recovering acetylene gas from waste sodium hypochlorite solution according to claim 1, wherein the feed adjusting device (10) comprises a liquid inlet pipe (11) and a buffer tank (12), and a feed control assembly (13) is arranged between the liquid inlet pipe (11) and the buffer tank (12).
8. The system for recovering acetylene gas from waste sodium hypochlorite solution according to claim 3, wherein the liquid outlet pipe (33) is provided with a liquid level adjusting assembly (331).
9. The system for recovering acetylene gas from a waste sodium hypochlorite solution according to claim 1, wherein the preheating device (20) comprises a preheater (21), and the preheater (21) is provided with a temperature regulating assembly (22).
10. The system for recovering acetylene gas from waste sodium hypochlorite solution according to claim 1, wherein a manhole (36) is arranged on the side wall of the flash tank (30) at a position opposite to the baffle plate (31) and/or at the bottom of the flash tank (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221466059.6U CN216963571U (en) | 2022-06-13 | 2022-06-13 | System for recovering acetylene gas in waste sodium hypochlorite solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221466059.6U CN216963571U (en) | 2022-06-13 | 2022-06-13 | System for recovering acetylene gas in waste sodium hypochlorite solution |
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| CN216963571U true CN216963571U (en) | 2022-07-15 |
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| CN202221466059.6U Active CN216963571U (en) | 2022-06-13 | 2022-06-13 | System for recovering acetylene gas in waste sodium hypochlorite solution |
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