Heat source control device of liquid carbon dioxide purification tower
By using liquid Freon as a heat source and cold source in the heat source control device of the liquid carbon dioxide purification tower, the problem of unstable operation of the purification tower is solved, product quality and output are improved, and energy consumption is reduced.
Patent Information
- Application Number
- CN202421548566.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-02
AI Technical Summary
Due to fluctuations in the liquid level of the carbon dioxide liquefier, the purification tower is unstable, affecting product output and quality and increasing production costs.
A heat source control device for liquid carbon dioxide purification tower is designed, and liquid Freon at 25 to 35°C is introduced at the bottom outlet of the Freon liquid storage tank to the inlet of the heat exchange snake tube at the bottom of the purification tower as a heat source for liquid carbon dioxide purification, and then cooled by heat exchange and entering the carbon dioxide liquefier as a cold source.
The liquid level fluctuation problem caused by the gas-liquid state of Freon after cooling the heat exchange tube at the bottom of the purification tower is solved when the gas-liquid state enters the carbon dioxide liquefier, which improves the operating stability of the purification tower, improves product output and quality, and reduces the energy consumption of the ice machine.
Smart Images
Figure CN222747612U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of carbon dioxide production, and in particular relates to a heat source control device for a liquid carbon dioxide purification tower. Background Art
[0002] A heat source control device for liquid carbon dioxide purification tower
[0003] The liquid carbon dioxide device uses the carbon dioxide exhaust gas from the low-temperature methanol washing process as raw material to produce food-grade carbon dioxide. The main production process includes compression, desulfurization, dehydrocarbonization, adsorption, liquefaction, purification, storage, filling, etc. In actual production, the Freon cooled by the heat exchange coil at the bottom of the purification tower exists in gas and liquid phases. When it enters the carbon dioxide liquefier, it causes the liquid level of the liquefier to fluctuate, and the liquefaction temperature also fluctuates accordingly, resulting in unstable operation of the purification tower, which ultimately affects product output and quality and increases production costs. Utility Model Content
[0004] The utility model provides a heat source control device for a liquid carbon dioxide purification tower, aiming to solve the practical problem of unstable operation of the purification tower caused by liquid level fluctuation of a carbon dioxide liquefier in a production process.
[0005] A heat source control device for a liquid carbon dioxide purification tower, characterized in that it includes a freon storage tank, a purification tower, a heat exchange coil, a carbon dioxide liquefier and an ice machine unit, the carbon dioxide gas purified by the adsorption tower is connected to the carbon dioxide liquefier pipe through a gas pipe, the carbon dioxide liquefier is connected to the upper part of the purification tower, and a third temperature meter is arranged on the liquid pipe, the top of the purification tower is connected to the flash steam gas pipe and a V8 regulating valve is arranged and electrically connected to the flow meter, the bottom of the purification tower is connected to the carbon dioxide liquid pipe and a V7 valve is arranged; the top of the carbon dioxide liquefier is connected to the gas pipe to the ice machine unit, and then the gas pipe is connected to the ice machine unit through a heat exchange coil, and the carbon dioxide gas is connected to the ice machine unit through a heat exchange coil, and the carbon dioxide gas is connected to the ice machine unit through a heat exchange coil, and then ... The liquid outlet pipe of the ice machine unit is connected to the top of the Freon storage tank, and the L1 liquid pipe is connected to the bottom of the Freon storage tank and divided into two routes. One route is provided with a V6 regulating valve and connected to the shell side of the carbon dioxide liquefier, and the other route is the L2 liquid pipe, which is connected to the heat exchange coil arranged at the bottom of the purification tower, and the V1 shut-off valve and the first thermometer are sequentially arranged on the L2 liquid pipe line. The heat exchange coil is connected to the L3 liquid pipe to the shell side of the carbon dioxide liquefier, and the second thermometer, V2 stop valve, V3 regulating valve, pressure gauge and V4 stop valve are sequentially arranged on the L3 liquid pipe line, and the V3 regulating valve is electrically connected to the flow meter.
[0006] Furthermore, the L3 liquid pipe is also connected to an L4 liquid pipe, both ends of the L4 liquid pipe are respectively connected before the V2 stop valve and after the V4 stop valve, and a V5 stop valve is arranged on the L4 liquid pipe.
[0007] The beneficial effect of the utility model is that a stream of liquid Freon at 25-35°C is introduced from the outlet pipe at the bottom of the Freon storage tank to the inlet of the heat exchange coil at the bottom of the purification tower as a heat source for purifying liquid carbon dioxide, and after heat exchange cooling, the Freon enters the carbon dioxide liquefier as a cold source. The heat source of the purification tower is changed from the existing gaseous Freon at 55-70°C to liquid Freon at 25-35°C, which solves the problem that the liquid level of the liquefier fluctuates when the Freon cooled by the heat exchange coil at the bottom of the purification tower enters the carbon dioxide liquefier in a gas-liquid two-phase state, thereby causing the purification tower to run unsteadily and affecting the product output and quality. At the same time, since the temperature of the liquid Freon in the storage tank is lower than the temperature of the gaseous Freon at the outlet of the ice machine, the temperature of the Freon that finally enters the carbon dioxide liquefier is also relatively lower, thereby reducing the energy consumption of the ice machine. The device has a beneficial value in improving product output and quality and saving energy and reducing consumption of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 The figure is a schematic diagram of the structure of a heat source control device for a liquid carbon dioxide purification tower.
[0009] Among them: 1-Freon storage tank, 2-purification tower, 3-heat exchange coil, 4-carbon dioxide liquefier, 5-ice machine unit, 6-first temperature gauge, 7-second temperature gauge, 8-pressure gauge, 9-flow meter, 10-third temperature gauge, 11-V1 stop valve, 12-V2 stop valve, 13-V3 regulating valve, 14-V4 stop valve, 15-V5 stop valve, 16-V6 regulating valve, 17-V7 position regulating valve, 18-V8 regulating valve, 19-L1 liquid pipe, 20-L2 liquid pipe, 21-L3 liquid pipe, 22-L4 liquid pipe. DETAILED DESCRIPTION
[0010] Embodiment 1: A heat source control device for a liquid carbon dioxide purification tower, comprising a Freon storage tank 1, a purification tower 2, a heat exchange coil 3, a carbon dioxide liquefier 4 and an ice machine unit 5. The carbon dioxide gas purified from the adsorption tower is connected to the carbon dioxide liquefier 4 pipe line through a gas pipe for cooling and liquefaction. The carbon dioxide liquefier 4 is connected to the upper part of the purification tower 2 through a liquid pipe, and a third thermometer 10 is arranged on the liquid pipe line to monitor the temperature of the carbon dioxide after liquefaction. The carbon dioxide liquefied by the carbon dioxide liquefier 4 enters the purification tower 2 for flash distillation and purification. The purification tower 2 is connected to the flash steam gas pipe and is provided with a V8 regulating valve 18 and is electrically connected to a flow meter 9. The V8 regulating valve is used to adjust and control the pressure of the purification tower 2, and the flow meter 9 is used to indicate the flash gas flow at the top of the tower; the carbon dioxide liquid pipe is connected to the bottom of the purification tower 2 and a V7 valve 17 is arranged. The V7 valve 17 is used to adjust and control the liquid level of the purification tower 2. The top of the carbon dioxide liquefier 4 is connected to an air outlet pipe to the ice machine unit 5, and then the ice machine unit 5 is connected to a liquid outlet pipe to the top of the Freon storage tank 1. The gaseous Freon output from the top of the carbon dioxide liquefier 4 enters the ice machine unit 5, is compressed and condensed, and then becomes liquid Freon and enters the Freon storage tank 1.
[0011] The L1 liquid pipe 19 is connected to the bottom of the Freon storage tank 1 and is divided into two paths. One path is provided with a V6 regulating valve 16 and connected to the shell side of the carbon dioxide liquefier 4. The liquid Freon serves as a cold source for the shell side of the carbon dioxide liquefier 4. The V6 regulating valve 16 is used to control the liquid level of the carbon dioxide liquefier 4. The other path is the L2 liquid pipe 20, which is connected to the heat exchange coil 3 provided at the bottom of the purification tower 2. A V1 shut-off valve 11 and a first thermometer 6 are sequentially provided on the L2 liquid pipe 20. The liquid Freon serves as a heat source for purifying the liquid carbon dioxide in the purification tower 2. The V1 shut-off valve 11 is used to conduct the process of the liquid Freon. The first thermometer 6 is used to indicate the temperature of the Freon at the inlet of the heat exchange coil 3 at the bottom of the purification tower 2. The heat exchange coil 3 is connected to the L3 liquid pipe 21 to the shell side of the carbon dioxide liquefier 4. The second thermometer 6 is sequentially provided on the L3 liquid pipe 21. The second thermometer 7 is used to indicate the temperature of the Freon at the outlet of the heat exchange coil 3. By comparing it with the first thermometer 6, the operation status of the heat exchange coil 3 can be judged. The pressure gauge 8 is used to indicate the medium pressure in the L3 liquid pipe 20. By combining it with the second thermometer 7, the phase state of the medium can be judged, and whether the heat exchange coil 3 is leaking can also be judged. The L3 liquid pipe 21 is also connected to the L4 liquid pipe 22, and the two ends of the L4 liquid pipe 22 are respectively connected before the V2 stop valve 12 and after the V4 stop valve 14, and a V5 stop valve 15 is arranged on the L4 liquid pipe 22. When the L3 liquid pipe 21 fails, the V5 stop valve 15 is opened to put the L4 liquid pipe 22 into use.
[0012] When in use: the carbon dioxide gas purified from the adsorption tower enters the carbon dioxide liquefier 4 tube side and the purification tower 2 in turn, and is vented at the top of the purification tower 2. The pressure of the purification tower 2 is controlled at 2.2-2.3MPa by the V8 regulating valve 18. The 25-35℃ liquid Freon from the bottom of the Freon storage tank 1 enters the shell side of the carbon dioxide liquefier 4 through the liquid level V6 regulating valve 16, and the shell side liquid level of the carbon dioxide liquefier 4 is controlled at 40-50% by the V6 regulating valve 16. After the ice machine unit 5 is running, the gaseous Freon coming out of the top of the shell side of the carbon dioxide liquefier 4 enters the ice machine unit 5 for compression and condensation, and then the liquid Freon with a temperature of 25-35℃ and a pressure of 1.2-1.5MPa enters the Freon storage tank 1. As the outlet temperature 10 of the carbon dioxide liquefier 4 tube side gradually drops to -17--20℃, the heat source control system is put into use:
[0013] First, close the V5 stop valve 15 of the L4 liquid pipe 22 and the V3 regulating valve 13 on the L3 liquid pipe 21; then, open the V1 stop valve 11, V2 stop valve 12 and V4 stop valve 14; finally, adjust the opening of the V3 regulating valve 13 according to the indication of the flow meter 9, purify the liquid carbon dioxide, and control the flash gas flow rate at the top of the tower 2 to 850-1000Nm3 / h to ensure that the product quality and output meet the standards. The V3 regulating valve 13 can adjust the flow meter 9 manually or automatically. The liquid carbon dioxide at the bottom of the purification tower 2 is sent to the storage tank as a product, and the liquid level of the purification tower 2 is controlled at 70-80% by the V7 regulating valve 17 at the bottom of the tower, and the liquid level just submerges the heat exchange coil 3.
Claims
1. A heat source control device for a liquid carbon dioxide purification tower, characterized in that: It includes a Freon storage tank, a purification tower, a heat exchange coil, a carbon dioxide liquefier and an ice machine unit. The carbon dioxide gas purified by the adsorption tower is connected to the carbon dioxide liquefier pipe through a gas pipe. The carbon dioxide liquefier is connected to the upper part of the purification tower, and a third temperature meter is set on the liquid pipe. The top of the purification tower is connected to a flash steam gas pipe and a V8 regulating valve is set and electrically connected to the flow meter. The bottom of the purification tower is connected to a carbon dioxide liquid pipe and a V7 valve is set; the top of the carbon dioxide liquefier is connected to a gas pipe to the ice machine unit, and then the ice machine unit is connected to a liquid pipe to the Freon. At the top of the liquid storage tank, the L1 liquid pipe is connected to the bottom of the Freon liquid storage tank and is divided into two routes. One route is provided with a V6 regulating valve and connected to the shell side of the carbon dioxide liquefier, and the other route is the L2 liquid pipe, which is connected to the heat exchange coil arranged at the bottom of the purification tower, and the V1 shut-off valve and the first thermometer are sequentially arranged on the L2 liquid pipe line. The heat exchange coil is connected to the L3 liquid pipe to the shell side of the carbon dioxide liquefier, and the second thermometer, V2 stop valve, V3 regulating valve, pressure gauge and V4 stop valve are sequentially arranged on the L3 liquid pipe line, and the V3 regulating valve is electrically connected to the flow meter.
2. A heat source control device for a liquid carbon dioxide purification tower as claimed in claim 1, characterized in that The L3 liquid pipe is also connected to an L4 liquid pipe, both ends of the L4 liquid pipe are respectively connected before the V2 stop valve and after the V4 stop valve, and a V5 stop valve is arranged on the L4 liquid pipe.