A negative pressure dew point refrigeration type drier

Abstract

The utility model discloses a kind of negative pressure dew point refrigeration type dryers, it is related to dryer, including first evaporator, second evaporator, first pipeline and second pipeline, wherein: the first pipeline is sequentially connected with heat exchanger and gas-water separator from input end to output end in order, the output end of the gas-water separator is fixedly communicated with the first input end of the first evaporator;First bypass pipeline is communicated between the output end of the gas-water separator and the first input end of the second evaporator;The second pipeline includes cooler, the input end of the cooler is fixedly communicated with cold water tank, and output end is fixedly communicated with water pump;First communication pipeline is fixedly communicated between the input end of the water pump and the output end of the second evaporator.The utility model is through the architecture of "double machine parallel connection", not only realizes the scientific distribution of system capacity, more significantly improves the overall operation energy efficiency and reliability of equipment.

Description

Technical Field

[0001] This utility model relates to dryers, specifically to a negative pressure dew point refrigeration dryer. Background Technology

[0002] In the operation of existing micro-thermal adsorption dryers, the regeneration stage typically requires the consumption of compressed air for adsorbent desorption and regeneration, resulting in overall system air volume loss. Taking a typical operating condition as an example, assuming the inlet compressed air volume is 100%, after drying, the actual usable finished product air volume is approximately 90%, and the remaining approximately 10% of the compressed air is used as regeneration gas during the regeneration process, resulting in loss as process consumption of the equipment itself. Utility Model Content

[0003] The purpose of this invention is to provide a negative pressure dew point freeze dryer to solve the above-mentioned problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a negative pressure dew point refrigeration dryer, comprising a first evaporator, a second evaporator, a first pipeline, and a second pipeline, wherein: A heat exchanger and a gas-water separator are connected in series from the input end to the output end on the first pipeline, and the output end of the gas-water separator is fixedly connected to the first input end of the first evaporator. A first bypass pipe is connected in parallel between the output end of the gas-water separator and the first input end of the second evaporator. The second pipeline includes a cooler, the input end of which is fixedly connected to a cold water tank, and the output end of which is fixedly connected to a water pump; The input end of the water pump is fixedly connected to the output end of the second evaporator via a first connecting pipe, and the output end of the first evaporator is fixedly connected to a second connecting pipe connected in parallel with the first connecting pipe. The input end of the cold water tank is fixedly connected to the output end of the first evaporator via a third connecting pipe, and the output end of the second evaporator is fixedly connected to a fourth connecting pipe connected in parallel with the third connecting pipe. The output and input ends of the cooler are fixedly connected to a loop pipeline, and the loop pipeline is connected in series with a gas-liquid separator, a refrigeration compressor and a condenser.

[0005] Preferably, an expansion valve, a filter, and a reheater are also connected in series on the circuit pipeline. The input end of the reheater is fixedly connected to the output end of the condenser, and the output end of the expansion valve is fixedly connected to the input end of the cooler.

[0006] Preferably, the output end of the reheater is connected in parallel with the pipeline of the output end of the water pump; The output end of the reheater is fixedly connected to the output end of the first evaporator by a fifth connecting pipe that is connected in series with the first valve. The output pipe of the second evaporator is connected in parallel to the fifth connecting pipe, and a sixth connecting pipe, which is fixedly connected in series with the second valve, is also connected to it.

[0007] Preferably, a third valve is connected in series on the third connecting pipeline.

[0008] Preferably, a fourth valve is connected in series on the fourth connecting pipeline.

[0009] Preferably, a fifth valve is connected in series on the first connecting pipeline.

[0010] Preferably, a sixth valve is connected in series on the second connecting pipeline.

[0011] Preferably, a seventh valve is connected in series on the pipeline between the output end of the gas-water separator and the first input end of the first evaporator.

[0012] Preferably, an eighth valve is connected in series on the first bypass pipeline.

[0013] Preferably, the output end of the heat exchanger is connected in parallel with the input ends of the first evaporator and the second evaporator.

[0014] In the above technical solution, the negative pressure dew point refrigerated dryer provided by this utility model has the following beneficial effects: Through rigorous calculation, to meet the process requirement of cooling compressed air to -20℃, two independent refrigeration systems are adopted to form a redundant architecture. Each system undertakes the rated refrigeration task and operates efficiently under the conditions of evaporation temperature -25℃ and condensation temperature 40℃. Furthermore, during operation, one independent refrigeration system is in operation, while the other independent refrigeration system is in a standby state, responsible for melting any frost or ice that forms during use; the two systems are used in a cycle. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a structural schematic diagram provided for an embodiment of the present utility model.

[0017] Explanation of reference numerals in the attached figures: 1. First evaporator; 2. Second evaporator; 3. Heat exchanger; 4. Gas-liquid separator; 5. Cooler; 6. Cold water tank; 7. Gas-liquid separator; 8. Refrigeration compressor; 9. Condenser; 10. Expansion valve; 11. Filter; 12. Reheater; 13. Water pump. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, a negative pressure dew point refrigerated dryer includes a first evaporator 1, a second evaporator 2, a first pipeline, and a second pipeline, wherein: A heat exchanger 3 and a gas-water separator 4 are connected in series from the input end to the output end on the first pipeline. The output end of the gas-water separator 4 is fixedly connected to the first input end of the first evaporator 1. A first bypass pipe is connected in parallel between the output end of the gas-liquid separator 4 and the first input end of the second evaporator 2. The second pipeline includes a cooler 5, the input end of which is fixedly connected to a cold water tank 6, and the output end of which is fixedly connected to a water pump 6. A first connecting pipe is fixedly connected between the input end of the water pump 6 and the output end of the second evaporator 2, and a second connecting pipe is fixedly connected to the output end of the first evaporator 1 in parallel with the first connecting pipe. A third connecting pipe is fixedly connected between the input end of the cold water tank 6 and the output end of the first evaporator 1, and a fourth connecting pipe is fixedly connected to the output end of the second evaporator 2 in parallel with the third connecting pipe. The output and input ends of the cooler 5 are fixedly connected to a loop pipeline, which in turn connects in series a gas-liquid separator 7, a refrigeration compressor 8, and a condenser 9. Furthermore, an expansion valve 10, a filter 11, and a reheater 12 are also connected in series on the loop pipeline. The input end of the reheater 12 is fixedly connected to the output end of the condenser 9, and the output end of the expansion valve 10 is fixedly connected to the input end of the cooler 5.

[0020] Furthermore, the output end of the reheater 12 is connected in parallel with the output end of the water pump 6, and the output end of the reheater 12 is fixedly connected to the output end of the first evaporator 1 by a fifth connecting pipe that is connected in series with the first valve. The output end of the second evaporator 2 is connected in parallel with the fifth connecting pipe by a sixth connecting pipe that is fixedly connected in series with the second valve.

[0021] Details: A third valve is connected in series on the third connecting pipeline.

[0022] A fourth valve is connected in series on the fourth connecting pipeline.

[0023] The first connecting pipe is connected in series with a fifth valve.

[0024] The second connecting pipe is connected in series with a sixth valve.

[0025] A seventh valve is connected in series on the pipeline between the output end of the gas-water separator 4 and the first input end of the first evaporator 1.

[0026] The eighth valve is connected in series on the first bypass pipeline.

[0027] The output end of heat exchanger 3 is connected in parallel to the input ends of the first evaporator 1 and the second evaporator 2, respectively.

[0028] In actual operation, the hot and humid compressed air to be processed first enters heat exchanger 3 for pre-cooling, and then passes through air-water separator 4 to initially remove liquid water. After that, the air flow path is regulated by valves, allowing it to enter the first evaporator 1 and the second evaporator 2 in parallel or alternately for deep freeze-drying, ultimately outputting dry air that meets the dew point requirements.

[0029] Furthermore, the hot and humid compressed air to be treated first enters heat exchanger 3 for pre-cooling, and then passes through air-water separator 4 to initially remove liquid water. After that, the air flow path is regulated by valves, allowing it to enter the first evaporator 1 and the second evaporator 2 in parallel or alternately for deep freeze-drying, ultimately outputting dry air that meets the dew point requirements.

[0030] Secondly, the chilled water in the cold water tank 6 is driven by the water pump 6 and divided into two paths: one path enters the first evaporator 1, and the other path enters the second evaporator 2, where they absorb heat from the compressed air. After absorbing heat and heating up, the chilled water eventually flows back to the cooler 5, transferring the cooling capacity it carries to the refrigerant, thus forming a closed energy exchange chain.

[0031] The required heat exchange to cool compressed air to the target dew point is 52kW. To compensate for potential cooling losses during actual operation (such as heat dissipation from pipelines), the design increases the capacity by 10%, determining the total cooling demand to be 57kW. To meet the total cooling demand of 57kW and improve system redundancy and energy efficiency, this scheme adopts dual independent refrigeration systems. Each subsystem undertakes a 57kW cooling task, with a design operating condition of evaporation temperature -25℃ and condensation temperature 40℃.

[0032] The refrigeration compressor 8 is a Danfoss DSH381-4 scroll compressor, and the water pump 13 is a refrigerant circulation pump.

[0033] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A negative pressure dew point freeze dryer, characterized in that, It includes a first evaporator (1), a second evaporator (2), a first pipeline, and a second pipeline, wherein: A heat exchanger (3) and a gas-water separator (4) are connected in series from the input end to the output end on the first pipeline. The output end of the gas-water separator (4) is fixedly connected to the first input end of the first evaporator (1). The output end of the gas-water separator (4) is connected in parallel with the first input end of the second evaporator (2) via a first bypass pipe; The second pipeline includes a cooler (5), the input end of which is fixedly connected to a cold water tank (6), and the output end of which is fixedly connected to a water pump (13). The input end of the water pump (13) is fixedly connected to the output end of the second evaporator (2) via a first connecting pipe, and the output end of the first evaporator (1) is fixedly connected to a second connecting pipe connected in parallel with the first connecting pipe. The input end of the cold water tank (6) is fixedly connected to the output end of the first evaporator (1) via a third connecting pipe, and the output end of the second evaporator (2) is fixedly connected to a fourth connecting pipe connected in parallel with the third connecting pipe. The output and input ends of the cooler (5) are fixedly connected to a loop pipeline, and the loop pipeline is connected in series with a gas-liquid separator (7), a refrigeration compressor (8) and a condenser (9).

2. The negative pressure dew point refrigeration dryer according to claim 1, characterized in that, An expansion valve (10), a filter (11), and a reheater (12) are also connected in series on the circuit pipeline. The input end of the reheater (12) is fixedly connected to the output end of the condenser (9), and the output end of the expansion valve (10) is fixedly connected to the input end of the cooler (5).

3. A negative pressure dew point refrigerated dryer according to claim 2, characterized in that, The output end of the reheater (12) is connected in parallel with the output end of the water pump (13) through a pipeline; The output end of the reheater (12) is fixedly connected to the output end of the first evaporator (1) by a fifth connecting pipe that is connected in series with the first valve; The output pipe of the second evaporator (2) is connected in parallel to the fifth connecting pipe, and a sixth connecting pipe is connected in series with the second valve.

4. A negative pressure dew point refrigerated dryer according to claim 1, characterized in that, A third valve is connected in series on the third connecting pipeline.

5. A negative pressure dew point freeze dryer according to claim 1, characterized in that, A fourth valve is connected in series on the fourth connecting pipeline.

6. A negative pressure dew point refrigerated dryer according to claim 1, characterized in that, A fifth valve is connected in series on the first connecting pipeline.

7. A negative pressure dew point refrigerated dryer according to claim 1, characterized in that, A sixth valve is connected in series on the second connecting pipeline.

8. A negative pressure dew point refrigerated dryer according to claim 1, characterized in that, A seventh valve is connected in series on the pipeline between the output end of the gas-water separator (4) and the first input end of the first evaporator (1).

9. A negative pressure dew point refrigerated dryer according to claim 1, characterized in that, An eighth valve is connected in series on the first bypass pipeline.

10. A negative pressure dew point refrigerated dryer according to claim 1, characterized in that, The output end of the heat exchanger (3) is connected in parallel to the input ends of the first evaporator (1) and the second evaporator (2).

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