Ethylene cryogenic anti-explosion low-temperature condensing unit

Abstract

The utility model relates to an ethylene cryogenic anti-explosion low-temperature condensing unit in the field of cryogenic storage equipment. The ethylene cryogenic anti-explosion low-temperature condensing unit comprises a liquid storage device, a first-stage condenser, a first-stage compressor, a condensing evaporator, a second-stage condenser, a second-stage compressor and an air cooler, the liquid storage device is connected with the primary condenser; the first-stage condenser is connected with the first-stage compressor; the first-stage compressor is connected with the condensation evaporator; the condensation evaporator is connected with the secondary condenser and the liquid storage device; the second-stage condenser is connected with the second-stage compressor; the second-stage compressor is connected with the air cooler; the air cooler is connected with the condensation evaporator. The ethylene cryogenic low-temperature condensing unit breaks through the defects of instability and difficulty in temperature control of a traditional cryogenic refrigeration house, solves the risk of overhigh exhaust pressure in the operation process, operates stably through structural innovation and experimental data, can fully meet high-requirement medium storage in the fields of new energy, chemical industry, biological medicine and the like, and has a wide application prospect. And the method has remarkable safety and economic benefits.

Description

TECHNICAL FIELD

[0001] The utility model relates to the deep cold storage equipment of high risk field such as chemical industry, biological medicine, and especially relates to an ethylene deep cold low temperature condensing unit, and is especially suitable for the safe storage of flammable and explosive medium (such as ethylene, lithium battery electrolyte) under-80 DEG C to-100 DEG C environment. BACKGROUND

[0002] The existing deep cold refrigerator has the following defects in the environment below-50 DEG C: the deep cold compressor starts to run from normal temperature condition, the refrigeration load is too large, the exhaust pressure of the secondary compressor is too high, and the compressor load is too large. UTILITY MODEL CONTENTS

[0003] In view of the defects in the prior art, the utility model provides an ethylene deep cold low temperature condensing unit, which solves the technical pain points of traditional refrigerators that are not explosion-proof at low temperature and are not flexible in explosion-proof.

[0004] The utility model is realized through the following technical schemes:

[0005] An ethylene deep cold explosion-proof low temperature condensing unit, comprising a liquid accumulator, a primary condenser, a primary compressor, a condensing evaporator, a secondary condenser, a secondary compressor and a cold air fan;

[0006] The outlet end of the liquid accumulator is connected to the inlet end of the primary condenser;

[0007] The outlet end of the primary condenser is connected to the inlet end of the primary compressor;

[0008] The outlet end of the primary compressor is connected to one of the inlet ends of the condensing evaporator;

[0009] One of the outlet ends of the condensing evaporator is connected to the inlet end of the secondary condenser, and the other outlet end is connected to the inlet end of the liquid accumulator;

[0010] The outlet end of the secondary condenser is connected to the inlet end of the secondary compressor, and the refrigerant in the secondary condenser is ethylene refrigerant;

[0011] The outlet end of the secondary compressor is connected to the inlet end of the cold air fan;

[0012] The outlet end of the cold air fan is connected to the other inlet end of the condensing evaporator.

[0013] In order to control the flow of the pipeline, realize throttling and pressure reduction, prevent the secondary condenser area from being underutilized and the knocking cylinder phenomenon, the outlet end of the secondary condenser is connected to the inlet end of the cold air fan, and an expansion valve is arranged on the connecting pipeline.

[0014] In order to effectively control the liquid supply amount at each cold storage temperature, a plurality of parallel liquid supply pipelines are arranged between the outlet end of the air cooler and the other inlet end of the condensing evaporator, and a liquid supply electromagnetic valve and a throttle valve are arranged on each liquid supply pipeline.

[0015] Preferably, the refrigerant in the primary condenser is R507 / R404a.

[0016] The ethylene cryogenic low-temperature condensing unit breaks through the instability and difficult temperature control shortcomings of traditional cryogenic cold storage, solves the risk of excessively high exhaust pressure in the operation process, and has stable performance operation through structural innovation and experimental data, can fully meet the high requirement medium storage suitable for new energy, chemical industry, biological medicine and other fields, and has remarkable safety and economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The utility model discloses an ethylene cryogenic explosion-proof low-temperature condensing unit structure principle diagram. DETAILED DESCRIPTION

[0018] The preferred embodiments of the utility model are described in detail in combination with the drawings, so that the advantages and characteristics of the utility model can be more easily understood by the person skilled in the art, and the protection scope of the utility model is more clearly and explicitly defined.

[0019] As Figure 1 The utility model discloses an ethylene cryogenic explosion-proof low-temperature condensing unit, which comprises a liquid accumulator 1, a primary condenser 2, a primary compressor 3, a condensing evaporator 4, a secondary condenser 5, a secondary compressor 6 and an air cooler 8.

[0020] Specifically, the outlet end of the liquid accumulator 1 is connected with the inlet end of the primary condenser 2, the outlet end of the primary condenser 2 is connected with the inlet end of the primary compressor 3, the refrigerant in the primary condenser 2 adopts R507 / R404a, the outlet end of the primary compressor 3 is connected with one of the inlet ends of the condensing evaporator 4, one of the outlet ends of the condensing evaporator 4 is connected with the inlet end of the secondary condenser 5, the other outlet end is connected with the inlet end of the liquid accumulator 1, the outlet end of the secondary condenser 5 is connected with the inlet end of the secondary compressor 6, the refrigerant in the secondary condenser 5 adopts ethylene refrigerant, the outlet end of the secondary condenser 5 is connected with the inlet end of the cold air machine 8, an expansion valve 7 is arranged on the connecting pipeline, the outlet end of the secondary compressor 6 is connected with the inlet end of the cold air machine 8, the outlet end of the cold air machine 8 is connected with the other inlet end of the condensing evaporator 4, and a plurality of (three in the embodiment) liquid supply pipelines in parallel are arranged between the outlet end of the cold air machine 8 and the other inlet end of the condensing evaporator 4, a liquid supply electromagnetic valve (including a first liquid supply electromagnetic valve 9, a second liquid supply electromagnetic valve 10 and a third liquid supply electromagnetic valve 11) and a throttling valve 12 are arranged on each liquid supply pipeline, and the three liquid supply electromagnetic valves are used for segmented control, so that the secondary compressor 6 can be controlled in the running refrigeration load.

[0021] The working principle of the utility model is as follows:

[0022] When the temperature of the cold storage is reduced from normal temperature, under the normal temperature condition, the running load of the secondary compressor 6 is too large, the liquid supply amount is small, only the first liquid supply electromagnetic valve 9 is opened, and the other two liquid supply electromagnetic valves are not opened, under the condition of small liquid supply amount, the running efficiency of the compressor is reduced, and the exhaust temperature of the compressor is reduced;

[0023] When the temperature of the cold storage is lower than-30 DEG C, the first liquid supply electromagnetic valve 9 and the second liquid supply electromagnetic valve 10 are opened, 2-way liquid supply is realized, the refrigerating capacity under the running condition is increased, the cooling rate is increased, the exhaust pressure is kept in the acceptable range of the compressor, and the 2-way liquid supply electromagnetic valves are kept running;

[0024] When the temperature of the cold storage is lower than-50 DEG C, the third liquid supply electromagnetic valve 11 is opened, under the running condition, the three liquid supply electromagnetic valves are simultaneously run, and a full load operation under the operation of the unit is completed;

[0025] When the temperature of the cold storage is lower than-65 DEG C, the first liquid supply electromagnetic valve 9 is closed, only the second liquid supply electromagnetic valve 10 and the third liquid supply electromagnetic valve 11 are opened, and the throttling flow is started to be reduced, which is used for the cooling effect under the low temperature condition;

[0026] When the temperature of the cold storage is lower than-70 DEG C, the second liquid supply electromagnetic valve 10 is closed, only the third liquid supply electromagnetic valve 11 is opened, throttling is carried out, the suction pressure of the secondary compressor 6 is reduced, and the cooling of the refrigerating machine is completed;

[0027] The unit adopts double-stage cascade refrigeration compressor, the first-stage refrigerant adopts R507 / R404a, the second-stage refrigerant adopts ethylene refrigerant, the boiling point of the ethylene refrigerant is -103 DEG C, the refrigeration unit of cold storage with evaporation temperature -100 DEG C can be provided, and stable operation can be realized under the working condition.

[0028] The above-mentioned embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that, for ordinary skilled person in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model.

Claims

1. An ethylene cryogenic explosion-proof low-temperature condensing unit, characterized in that: The refrigeration system comprises a liquid storage, a first condenser, a first compressor, a condensing evaporator, a second condenser, a second compressor and a cooling fan. The outlet end of the liquid storage is connected with the inlet end of the first condenser. The outlet end of the first condenser is connected with the inlet end of the first compressor. The outlet end of the first compressor is connected with one of the inlet ends of the condensing evaporator. One of the outlet ends of the condensing evaporator is connected with the inlet end of the second condenser, and the other outlet end is connected with the inlet end of the liquid storage. The outlet end of the second condenser is connected with the inlet end of the second compressor, and the refrigerant in the second condenser is ethylene refrigerant. The outlet end of the second compressor is connected with the inlet end of the cooling fan. The outlet end of the cooling fan is connected with the other inlet end of the condensing evaporator.

2. The cryogenic explosion-proof low temperature condensing unit of ethylene according to claim 1, characterized in that: The outlet end of the second condenser is connected with the inlet end of the cooling fan, and an expansion valve is arranged on the connecting pipeline.

3. The cryogenic explosion-proof low temperature condensing unit of ethylene according to claim 2, characterized in that: A plurality of liquid supply pipelines in parallel are arranged between the outlet end of the cooling fan and the other inlet end of the condensing evaporator, and a liquid supply electromagnetic valve and a throttle valve are arranged on each liquid supply pipeline.

4. The cryogenic explosion-proof low temperature condensing unit of ethylene according to claim 3, characterized in that: The refrigerant in the first condenser is R507 / R404a.

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