Sulfur dioxide purification device

Abstract

The sulfur dioxide purification device of the utility model comprises: a primary heat exchanger; a secondary heat exchanger for further cooling the raw gas; a primary separator for separating the raw gas into a gas phase and a liquid phase, the liquid phase outlet of the primary separator is connected to a first liquid phase discharge pipe, the first liquid phase discharge pipe is connected to a product storage tank, the gas phase outlet of the primary separator is connected to a secondary separator, the liquid phase outlet of the secondary separator is connected to a second liquid phase discharge pipe, the second liquid phase discharge pipe is connected to a product storage tank, the gas phase outlet of the secondary separator is connected to an air inlet of a secondary expander, the air outlet of the secondary expander is connected to an air inlet of a primary expander, and the air outlet of the primary expander is connected to an exhaust gas discharge pipe. The advantages of the sulfur dioxide purification device of the utility model are: the generated product has high purity, simple structure and reliable performance. The sulfur dioxide purification device of the utility model is ingeniously designed, highly practical, energy-saving and environmentally friendly, and has great economic value.

Description

Technical Field

[0001] The utility model relates to the recovery and utilization of chemical tail gas, in particular to a sulfur dioxide purification device. Background Art

[0002] Sulfur dioxide is the most common and simplest sulfur oxide. Its chemical formula is SO2. It is a colorless, transparent gas with a pungent odor. It is soluble in water, ethanol, and ether. Sulfur dioxide is one of the main air pollutants. It is emitted during volcanic eruptions and is also produced in many industrial processes. When sulfur dioxide dissolves in water, it forms sulfurous acid. If sulfurous acid is further oxidized, sulfuric acid is quickly and efficiently generated.

[0003] Sulfur dioxide is mainly used to produce sulfur trioxide, sulfuric acid, sulfite, and thiosulfate. It is also used as a fumigant, preservative, disinfectant, reducing agent, etc.

[0004] In industry, sulfur dioxide can be obtained by burning sulfur ore. The reaction gas undergoes a corresponding purification and liquefaction process to produce a sulfur dioxide product with corresponding quality requirements. The existing sulfur dioxide purification device has a complex structure and low efficiency. Utility Model Content

[0005] The utility model aims to provide a sulfur dioxide purification device.

[0006] The sulfur dioxide purification device of the utility model comprises:

[0007] A primary heat exchanger for cooling the raw gas to reduce its temperature;

[0008] A secondary heat exchanger for further cooling the raw gas, connected to the primary heat exchanger through a pipeline;

[0009] A primary separator is used to separate the raw gas into gas phase and liquid phase, the liquid phase outlet of the primary separator is connected to the first liquid phase discharge pipe, the first liquid phase discharge pipe is connected to the product storage tank, the gas phase outlet of the primary separator is connected to the secondary separator, the liquid phase outlet of the secondary separator is connected to the second liquid phase discharge pipe, the second liquid phase discharge pipe is connected to the product storage tank, the gas phase outlet of the secondary separator is connected to the air inlet of the secondary expander, the air outlet of the secondary expander is connected to the air inlet of the primary expander, the air outlet of the primary expander is connected to the exhaust gas discharge pipe, the exhaust gas discharge pipe passes through the primary heat exchanger, so that the exhaust gas in the exhaust gas discharge pipe provides cooling for the primary heat exchanger.

[0010] The utility model discloses a sulfur dioxide purification device, wherein the gas phase outlet of the first-stage separator is connected to the second-stage separator through a first pipeline, the first pipeline passes through a supercooler, and the gas phase outlet of the second-stage separator is connected to the air inlet of the second-stage expander through a second pipeline, and the second pipeline passes through the supercooler.

[0011] In the sulfur dioxide purification device of the utility model, a first throttle valve is arranged on the first liquid phase discharge pipe, and a second throttle valve is arranged on the second liquid phase discharge pipe.

[0012] The sulfur dioxide purification device of the utility model, wherein the air outlet of the secondary expander is connected to the air inlet of the primary expander through a third pipeline, and the third pipeline passes through a subcooler and a secondary heat exchanger.

[0013] The sulfur dioxide purification device of the utility model further includes a refrigeration system, which includes:

[0014] A compressor used to compress the refrigerant,

[0015] A water cooler for cooling the refrigerant, connected to the outlet of the compressor through a pipeline;

[0016] A third throttle valve is used for throttling and reducing the pressure of the refrigerant, wherein the inlet of the third throttle valve is connected to the outlet of the water cooler, and the outlet of the third throttle valve is connected to the air inlet of the compressor through a return line so that the refrigerant circulates between the compressor and the third throttle valve, the inlet of the third throttle valve is connected to the outlet of the water cooler through a fourth line, the fourth line passes through the secondary heat exchanger, and the return line passes through the secondary heat exchanger.

[0017] The advantages of the sulfur dioxide purification device of the utility model are: high purity of the generated product, simple structure and reliable performance. The sulfur dioxide purification device of the utility model is ingeniously designed, highly practical, energy-saving and environmentally friendly, and has great economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the sulfur dioxide purification device of the utility model. DETAILED DESCRIPTION

[0019] Sulfur dioxide is easy to liquefy. Because sulfur dioxide is a polar molecule with a large relative molecular mass and strong intermolecular forces, it has a low boiling point and is easy to liquefy.

[0020] like Figure 1 As shown, the sulfur dioxide purification device of the utility model comprises:

[0021] The primary heat exchanger E3 is used to cool the raw gas to reduce its temperature;

[0022] The secondary heat exchanger E2 for further cooling the raw gas is connected to the primary heat exchanger through a pipeline;

[0023] A primary separator V10 is used to separate the raw gas into gas phase and liquid phase, the liquid phase outlet of the primary separator is connected to the first liquid phase discharge pipe 10, the first liquid phase discharge pipe is connected to the product storage tank V30, the gas phase outlet of the primary separator V10 is connected to the secondary separator V20, the liquid phase outlet of the secondary separator V20 is connected to the second liquid phase discharge pipe 20, the second liquid phase discharge pipe is connected to the product storage tank, the gas phase outlet of the secondary separator is connected to the air inlet of the secondary expander ET2, the air outlet of the secondary expander is connected to the air inlet of the primary expander ET1, the air outlet of the primary expander is connected to the tail gas discharge pipe 50, the tail gas discharge pipe passes through the primary heat exchanger so that the tail gas in the tail gas discharge pipe provides cooling for the primary heat exchanger.

[0024] The sulfur dioxide purification device of the utility model, wherein the gas phase outlet of the first separator is connected to the second separator through a first pipeline 11, the first pipeline passes through a subcooler E4, the gas phase outlet of the second separator is connected to the air inlet of the second expander through a second pipeline 12, and the second pipeline passes through the subcooler E4.

[0025] In the sulfur dioxide purification device of the utility model, a first throttle valve V2 is provided on the first liquid phase discharge pipe 10 , and a second throttle valve V3 is provided on the second liquid phase discharge pipe 20 .

[0026] In the sulfur dioxide purification device of the utility model, the gas outlet of the secondary expander is connected to the gas inlet of the primary expander through the third pipeline 13, and the third pipeline passes through the subcooler and the secondary heat exchanger in sequence.

[0027] The sulfur dioxide purification device of the utility model further includes a refrigeration system, which includes:

[0028] Compressor C1 for compressing refrigerant,

[0029] A water cooler E1 for cooling the refrigerant is connected to the outlet of the compressor through a pipeline;

[0030] The third throttle valve V1 is used for throttling and reducing the pressure of the refrigerant. The inlet of the third throttle valve is connected to the outlet of the water cooler. The outlet of the third throttle valve is connected to the air inlet of the compressor through a return line 60, so that the refrigerant circulates between the compressor and the third throttle valve. The inlet of the third throttle valve is connected to the outlet of the water cooler through a fourth line 14. The fourth line passes through the secondary heat exchanger, and the return line passes through the secondary heat exchanger.

[0031] The working process of the sulfur dioxide purification device of the utility model:

[0032] The raw gas enters the primary heat exchanger E3 and the secondary heat exchanger E2 for cooling, and then enters the primary separator V10. The liquid phase at the bottom of the separator is throttled by the first throttle valve V2 and sent to the product storage tank V30. The gas phase at the top of the separator enters the subcooler E4 for cooling, and then enters the secondary separator V20. The liquid phase at the bottom of the separator is throttled by the second throttle valve V3 and sent to the product storage tank V30. The gas phase at the top of the separator enters the subcooler E4 for rewarming, and then enters the secondary expander ET2 for expansion, cooling and depressurization, and then enters the subcooler E4 and the secondary heat exchanger E2 again, and then enters the primary expander ET1 for cooling and depressurization, and then enters the primary heat exchanger E3. After heat exchange and rewarming, the tail gas exits the device.

[0033] After being pressurized by compressor C1, the refrigerant is cooled to 40°C by water cooler E1, enters the secondary heat exchanger E2, is throttled and depressurized by the third throttle valve V1, exchanges heat with the secondary heat exchanger E2, and then returns to the compressor inlet.

[0034] The heat exchanger can be a plate-fin heat exchanger, a plate heat exchanger, a coiled-tube heat exchanger, a shell-and-tube heat exchanger, or a combination thereof.

[0035] The raw gas may be a reaction product gas containing SO2 and other impurities.

[0036] The expander can be a turbine type or a screw type.

[0037] The refrigerant may be a hydrocarbon refrigerant, a Freon refrigerant, or any combination thereof.

[0038] The utility model has the advantages of high purity of process products and reliable performance.

[0039] The sulfur dioxide purification device of the utility model is ingenious in design, strong in practicability, energy-saving and environmentally friendly, and has great economic value.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A sulfur dioxide purification device, characterized in that: include: A primary heat exchanger for cooling the raw gas to reduce its temperature; A secondary heat exchanger for further cooling the raw gas, connected to the primary heat exchanger through a pipeline; A primary separator is used to separate the raw gas into gas phase and liquid phase, the liquid phase outlet of the primary separator is connected to the first liquid phase discharge pipe, the first liquid phase discharge pipe is connected to the product storage tank, the gas phase outlet of the primary separator is connected to the secondary separator, the liquid phase outlet of the secondary separator is connected to the second liquid phase discharge pipe, the second liquid phase discharge pipe is connected to the product storage tank, the gas phase outlet of the secondary separator is connected to the air inlet of the secondary expander, the air outlet of the secondary expander is connected to the air inlet of the primary expander, the air outlet of the primary expander is connected to the exhaust gas discharge pipe, the exhaust gas discharge pipe passes through the primary heat exchanger, so that the exhaust gas in the exhaust gas discharge pipe provides cooling for the primary heat exchanger.

2. The sulfur dioxide purification device according to claim 1, characterized in that: The gas phase outlet of the primary separator is connected to the secondary separator through a first pipeline, the first pipeline passes through a subcooler, and the gas phase outlet of the secondary separator is connected to the air inlet of the secondary expander through a second pipeline, and the second pipeline passes through the subcooler.

3. The sulfur dioxide purification device according to claim 2, characterized in that: The first liquid phase discharge pipe is provided with a first throttle valve, and the second liquid phase discharge pipe is provided with a second throttle valve.

4. The sulfur dioxide purification device according to claim 3, characterized in that: The air outlet of the secondary expander is connected to the air inlet of the primary expander through a third pipeline, and the third pipeline passes through a subcooler and a secondary heat exchanger.

5. The sulfur dioxide purification device according to claim 4, characterized in that: Also included is a refrigeration system, the refrigeration system comprising: A compressor used to compress the refrigerant, A water cooler for cooling the refrigerant, connected to the outlet of the compressor through a pipeline; A third throttle valve is used for throttling and reducing the pressure of the refrigerant, wherein the inlet of the third throttle valve is connected to the outlet of the water cooler, and the outlet of the third throttle valve is connected to the air inlet of the compressor through a return line so that the refrigerant circulates between the compressor and the third throttle valve, the inlet of the third throttle valve is connected to the outlet of the water cooler through a fourth line, the fourth line passes through the secondary heat exchanger, and the return line passes through the secondary heat exchanger.

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