Flammable and explosive gas dewatering device

Abstract

The utility model discloses an inflammable and explosive gas dewatering device, including gas cooling water removal flow path, heat transfer medium circulation flow path and refrigerant circulation flow path, the gas cooling water removal flow path includes the pre -cooler, gas -liquid heat exchanger, gas -liquid separator and deliquescent dryer that connect gradually, heat transfer medium circulation flow path includes evaporimeter, gas -liquid heat exchanger, cold accumulator and circulating pump, the refrigerant in refrigerant circulation flow path absorbs heat and evaporates in evaporimeter and makes the heat transfer medium in heat transfer medium circulation flow path cooling. The utility model has the advantages of strong integrability, good operation safety, high dewatering efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of gas dehydration devices, and in particular to a flammable and explosive gas dehydration device. Background Technology

[0002] Flammable and explosive gases are those that, when mixed with air in a certain proportion under standard atmospheric pressure, can burn or explode when exposed to open flames, static electricity, or other energy sources. Common flammable and explosive gases include natural gas, liquefied petroleum gas (LPG), hydrogen, and alcohols. Dehydration methods for flammable and explosive gases can generally be divided into two main categories: physical dehydration and chemical dehydration. Condensation dehydration is a common physical dehydration method. Its principle is to use a temperature difference to condense water vapor in the gas into liquid, and then separate the liquid water from the gas using a gas-liquid separation device.

[0003] Currently, flammable and explosive gas condensation and dehydration devices often employ either heat exchange between the flammable and explosive gas and an external cold source, or indirect heat transfer via the evaporator surface directly exchanging heat with the refrigerant in the refrigeration system. However, both of these methods suffer from drawbacks: using an external cold source results in relatively low integration, complex installation, and high overall cost; while direct heat exchange with the refrigerant in the refrigeration system poses a safety risk if the evaporator leaks internally, allowing the flammable and explosive gas to enter the refrigeration compressor. Furthermore, condensation dehydration of flammable and explosive gases can lead to cooling failure and excessive water content in the outlet gas if the cold source quality is poor or supply is abnormal. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a device for dehydrating flammable and explosive gases.

[0005] The purpose of this utility model is achieved through the following technical solution: a flammable and explosive gas dehydration device, comprising a gas cooling and dehydration flow path, a refrigerant circulation flow path, and a refrigerant circulation flow path. The gas cooling and dehydration flow path includes a precooler, a gas-liquid heat exchanger, a gas-liquid separator, and a deliquescent dryer connected in sequence. The refrigerant circulation flow path includes an evaporator, a gas-liquid heat exchanger, a cold storage tank, and a circulation pump. The refrigerant in the refrigerant circulation flow path absorbs heat and evaporates in the evaporator, thereby cooling the refrigerant in the refrigerant circulation flow path.

[0006] Preferably, the precooler is provided with a first gas inlet, a first gas outlet corresponding to the first gas inlet, a second gas inlet, and a second gas outlet corresponding to the second gas inlet; the gas-liquid heat exchanger is provided with a refrigerant inlet, a refrigerant outlet, a processing gas inlet, and a processing gas outlet. The processing gas enters through the first gas inlet, the first gas outlet is connected to the processing gas inlet, the processing gas outlet is connected to a gas-liquid separator, the gas-liquid separator is connected to the inlet of a deliquescent dryer, and the outlet of the deliquescent dryer is connected to the second gas inlet; the refrigerant in the refrigerant circulation path enters the gas-liquid heat exchanger through the refrigerant inlet and exits from the refrigerant outlet.

[0007] Preferably, the refrigerant circulation path includes a refrigeration compressor, a condenser, a throttling element, and an evaporator connected in sequence.

[0008] Preferably, a liquid collector is provided between the evaporator and the refrigeration compressor, and a dryer filter is provided between the condenser and the throttling element.

[0009] Preferably, the deliquescent dryer is a single-tower deliquescent dryer, which uses calcium chloride as a deliquescent agent.

[0010] Preferably, both the gas-liquid separator and the deliquescent dryer are equipped with hydrophobic devices.

[0011] Preferably, the hydrophobic device is a zero-air-consumption automatic hydrophobic valve.

[0012] Preferably, the throttling element is an electronic expansion valve, and the refrigeration compressor is a variable frequency refrigeration compressor.

[0013] Preferably, the refrigerant in the refrigerant circulation path is one or both of hydrofluorocarbons or hydrofluoroolefins.

[0014] Preferably, the refrigerant in the refrigerant circulation path is an aqueous solution of water or an alcohol.

[0015] The beneficial effects of this utility model are as follows: This utility model adopts an indirect cooling and drying method to cool and condense flammable and explosive gases under the premise of ensuring the safety of the process, removing most of the moisture contained in them, and performing secondary dehumidification through a deliquescence absorption system, effectively ensuring the dryness of the gas at the outlet of the device; compared with the prior art, the flammable and explosive gas dehydration device proposed in this utility model has the characteristics of strong integrability, good operational safety, and high dehydration efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] In the diagram: 1. Precooler; 2. Gas-liquid separator; 3. Gas-liquid heat exchanger; 4. Cold accumulator; 5. Evaporator; 6. Refrigeration compressor; 7. Condenser; 8. Circulating pump; 9. Throttling element; 10. Deliquescent dryer; 11. Dryer filter; 12. Liquid collector. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0019] like Figure 1 As shown, a flammable and explosive gas dehydration device includes a gas cooling and dehydration flow path, a refrigerant circulation flow path, and a refrigerant circulation flow path. The gas cooling and dehydration flow path includes a precooler 1, a gas-liquid heat exchanger 3, a gas-liquid separator 2, and a deliquescent dryer 10 connected in sequence. The refrigerant circulation flow path includes an evaporator 5, a gas-liquid heat exchanger 3, a cold storage 4, and a circulation pump 8. The refrigerant in the refrigerant circulation flow path absorbs heat and evaporates in the evaporator 5, thereby cooling the refrigerant in the refrigerant circulation flow path.

[0020] The precooler 1 is equipped with a first gas inlet, a first gas outlet corresponding to the first gas inlet, a second gas inlet, and a second gas outlet corresponding to the second gas inlet. The gas-liquid heat exchanger is equipped with a refrigerant inlet, a refrigerant outlet, a processing gas inlet, and a processing gas outlet. The processing gas is introduced through the first gas inlet, the first gas outlet is connected to the processing gas inlet, the processing gas outlet is connected to the gas-liquid separator 2, the gas-liquid separator 2 is connected to the inlet of the deliquescent dryer 10, and the outlet of the deliquescent dryer 10 is connected to the second gas inlet. The refrigerant in the refrigerant circulation path is introduced into the gas-liquid heat exchanger through the refrigerant inlet and discharged from the refrigerant outlet.

[0021] The principle of this invention is as follows: Moist, flammable, and explosive gas (processing gas) from the front end enters the precooler 1 through the first gas inlet. In the precooler 1, the processing gas exchanges heat with the low-temperature dry gas from the outlet of the deliquescent dryer 10, thus performing preliminary precooling. The precooled processing gas is then discharged from the first gas outlet and introduced into the gas-liquid heat exchanger through the processing gas inlet. In the gas-liquid heat exchanger, the processing gas exchanges heat with the refrigerant in the refrigerant circulation path, causing the moisture in the processing gas to condense and form liquid water. The condensed liquid water is separated by the gas-liquid separator 2 and discharged outside the equipment through a hydrophobic device installed on the gas-liquid separator 2. The processing gas, after being condensed and dried by the gas-liquid heat exchanger, is then introduced into the deliquescent dryer 10 for further drying. Finally, the dried gas is discharged from the first gas outlet.

[0022] In this process, the refrigerant circulates in the refrigerant circulation path. The refrigerant from the cold storage 4 is transported to the gas-liquid heat exchanger by the circulation pump 8, where it exchanges heat with the processing gas (containing humid, flammable, and explosive gas) from the precooler 1. After removing its heat, it enters the evaporator 5, where it exchanges heat with the refrigerant in the refrigerant circulation path. The low-temperature, low-pressure liquid refrigerant in the refrigerant circulation path enters the evaporator 5, where it evaporates and absorbs heat, exchanging heat with the refrigerant in the refrigerant circulation path and cooling the refrigerant to maintain it at a low temperature. The cooled refrigerant is then transported back to the cold storage 4 and continuously circulated under the drive of the circulation pump 8.

[0023] The refrigerant circulation path includes a refrigeration compressor 6, a condenser 7, a throttling element 9, and an evaporator 5 connected in sequence. A liquid collector 12 is installed between the evaporator 5 and the refrigeration compressor 6. In a refrigeration system, if liquid refrigerant flows directly back to the compressor, it may cause serious damage due to the incompressible nature of liquids; this phenomenon is called liquid slugging. The liquid collector, installed between the evaporator outlet and the compressor inlet, collects incompletely evaporated liquid refrigerant. The liquid collector effectively collects and stores this liquid refrigerant, preventing it from flowing directly back to the compressor, thus protecting the safe operation of the compressor.

[0024] A dryer filter 11 is provided between the condenser 7 and the throttling element 9.

[0025] The refrigerant circulates in the refrigerant circulation path. In the evaporator 5, the refrigerant absorbs heat and evaporates into a gaseous state. It is then drawn into the refrigeration compressor 6, which compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas. This gas is then discharged to the inlet of the condenser 7, where the heat it carries is carried away, and it becomes a room-temperature, high-pressure liquid. It then enters the dryer filter 11 to remove trace impurities and moisture. After passing through the throttling element 9, it returns to its low-temperature, low-pressure liquid state and finally enters the evaporator 5 to absorb heat and evaporate. The refrigerant circulates continuously under the drive of the refrigeration compressor 6.

[0026] In this embodiment, the throttling element 9 is an electronic expansion valve, and the refrigeration compressor 6 is a variable frequency refrigeration compressor 6.

[0027] In this embodiment, the deliquescent dryer 10 is a single-tower deliquescent dryer 10, which uses calcium chloride as a deliquescent agent.

[0028] Deliquescence refers to the phenomenon where certain substances (mostly solids) absorb or adsorb moisture from a gas, gradually becoming damp and slippery on their surface, eventually transforming from a solid into a solution. The deliquescence process can be divided into the following steps: 1) Absorption: The substance first absorbs moisture from the environment. This usually occurs on the surface of the substance, with the moisture diffusing into the interior; 2) Dissolution: Once the substance has absorbed enough moisture, it forms a saturated solution on its surface. This process involves the interaction between the substance and water molecules until a dissolution equilibrium is reached; 3) Diffusion: Once a saturated solution has formed on the surface, this process further diffuses into the interior of the substance. This means that deliquescence not only occurs on the surface of a substance but can also affect the entire substance.

[0029] The deliquescent dryer 10 is installed to remove moisture from gas and provide clean gas to end-use equipment. The gas containing moisture enters through the lower inlet of the deliquescent tower, passes through the layer of deliquescent agent accumulated inside, and gradually has its remaining moisture absorbed by the agent. The reacted deliquescent agent itself melts and is discharged in liquid form from the drain outlet. The dried clean gas is discharged from the upper gas outlet of the deliquescent tower.

[0030] There is a sight glass at 2 / 3 of the height of the deliquescence tower. You can observe the deliquescence rate of the deliquescent agent through the sight glass. If you cannot observe the deliquescent agent in the sight glass, you need to add deliquescent agent. Just unscrew the packing port at the top of the deliquescence tower.

[0031] Many salts are prone to deliquescence, such as calcium chloride, magnesium chloride, and sodium sulfate. Calcium chloride, in particular, has extremely high hydrophilicity and readily combines with water molecules. Upon absorbing water vapor, calcium chloride undergoes a chemical reaction, forming a hydrated calcium chloride complex. In high-humidity environments, calcium chloride can absorb moisture at rates as high as 150%-300% of its own weight, and it is non-toxic, odorless, and non-corrosive.

[0032] Both the gas-liquid separator 2 and the deliquescent dryer are equipped with condensate traps. The condensate traps are zero-gas-consumption automatic condensate traps.

[0033] The refrigerant in the refrigerant circulation path is one or both of hydrofluorocarbons or hydrofluoroolefins. In this embodiment, the refrigerant is a mixture of difluoromethane and pentafluoroethane in a 1:1 mass ratio.

[0034] The refrigerant in the refrigerant circulation path is water or an aqueous solution of an alcohol. The alcohol is one of methanol, ethanol, ethylene glycol, propylene glycol, or glycerol.

[0035] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A flammable and explosive gas dehydration device, characterized in that, It includes a gas cooling and dehydration flow path, a refrigerant circulation flow path, and a refrigerant circulation flow path. The gas cooling and dehydration flow path includes a precooler, a gas-liquid heat exchanger, a gas-liquid separator, and a deliquescent dryer connected in sequence. The refrigerant circulation flow path includes an evaporator, a gas-liquid heat exchanger, a cold storage tank, and a circulation pump. The refrigerant in the refrigerant circulation flow path absorbs heat and evaporates in the evaporator, thereby cooling the refrigerant in the refrigerant circulation flow path.

2. The flammable and explosive gas dehydration device according to claim 1, characterized in that, The precooler is provided with a first gas inlet, a first gas outlet corresponding to the first gas inlet, a second gas inlet, and a second gas outlet corresponding to the second gas inlet; the gas-liquid heat exchanger is provided with a refrigerant inlet, a refrigerant outlet, a processing gas inlet, and a processing gas outlet. The processing gas enters through the first gas inlet, the first gas outlet is connected to the processing gas inlet, the processing gas outlet is connected to a gas-liquid separator, the gas-liquid separator is connected to the inlet of a deliquescent dryer, and the outlet of the deliquescent dryer is connected to the second gas inlet; the refrigerant in the refrigerant circulation path enters the gas-liquid heat exchanger through the refrigerant inlet and exits from the refrigerant outlet.

3. The flammable and explosive gas dehydration device according to claim 1, characterized in that, The refrigerant circulation path includes a refrigeration compressor, a condenser, a throttling element, and an evaporator connected in sequence.

4. The flammable and explosive gas dehydration device according to claim 3, characterized in that, A liquid collector is provided between the evaporator and the refrigeration compressor, and a dryer filter is provided between the condenser and the throttling element.

5. The flammable and explosive gas dehydration device according to claim 1, characterized in that, The deliquescent dryer is a single-tower deliquescent dryer, which uses calcium chloride as a deliquescent agent.

6. The flammable and explosive gas dehydration device according to claim 1, characterized in that, Both the gas-liquid separator and the deliquescent dryer are equipped with hydrophobic devices.

7. The flammable and explosive gas dehydration device according to claim 6, characterized in that, The drainage device is a zero-air-consumption automatic drainage valve.

8. The flammable and explosive gas dehydration device according to claim 3, characterized in that, The throttling element is an electronic expansion valve, and the refrigeration compressor is a variable frequency refrigeration compressor.

9. The flammable and explosive gas dehydration device according to claim 1, characterized in that, The refrigerant in the refrigerant circulation path is one or both of hydrofluorocarbons or hydrofluoroolefins.

10. A flammable and explosive gas dehydration device according to claim 1, characterized in that, The refrigerant in the refrigerant circulation path is an aqueous solution of water or alcohol.

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