At present, most air-conditioning enterprises use refrigerant storage tanks to store refrigerant, and the saturation pressure of refrigerant vapor in the storage tank is generally about 110112 MPa. For this reason, in the practical application, the recycled refrigerant should be considered to the storage tank. Various influencing factors at the time of transfer. First of all, in terms of refrigerant recovery power, taking into account the recovery speed and the output pressure factor, if the conventional vacuum pump for vacuuming is used as the recovery power, it will be difficult to meet the actual needs in terms of speed and output pressure, especially In terms of output pressure, it is impossible to meet the requirement that the transfer pressure of the refrigerant to be transferred to the storage tank must be greater than the internal pressure of the storage tank. Therefore, it is considered to use the compressor as the recovery power, and the refrigerant is used to reduce the refrigerant at the low pressure end when the compressor is operated. The workpiece is sucked out and outputted by compressor compression, and the output pressure can be achieved by selecting the compression ratio of the compressor. In terms of transfer, the transfer pressure of the device when transferring the recovered refrigerant must be greater than that in the storage tank. Saturating pressure of the agent, according to the experience of use, the saturation pressure of the storage tank is about 11112 MPa. If a compressor is used for the first-stage compression, the output of the storage tank must be a compressor with a relatively large compression. Thus, the compressor is Selection and difficulty in terms of service life, if With multi-stage compression, the problem is easily solved; in the purification and regeneration of the refrigerant, since the refrigerant is charged into the workpiece, it must contain a certain amount of oil, moisture and impurities, and if these substances are not removed, the system is connected. It is necessary to pollute the refrigerant in the storage tank system. Therefore, effective purification and regeneration means must be adopted to ensure the purity of the refrigerant. After research and analysis, we have adopted a process similar to compressed air purification and regeneration, which is to ensure the purity of the refrigerant through the multi-stage filtration, dry adsorption, and heating regeneration process when the refrigerant is in a gaseous state. In the liquefaction of the refrigerant, it can be solved by condenser condensation. In order to facilitate the installation and use of the equipment, air-cooled condensation technology can be adopted.
Technical design and characteristics of refrigerant recovery, recycling and recycling equipment According to the above analysis, the following design schemes have been made: (1) Two-stage compression technology, first-stage compressor (using 317kW or 5 Copeland rotary compressors) The main function is to recycle the refrigerant into the equipment, and then pressurize the refrigerant through a secondary compressor (using 212 kW or 3 Copeland rotary compressor) to meet the needs of refrigerant transfer, in order to avoid liquid from the compressor. In the phenomenon of gas injection, the equipment adopts gas-liquid separation technology at the inlet end of the two-stage compressor to ensure that the refrigerant enters the compressor in gaseous form.
(2) The degreasing process adopts a cyclone separator and a precision filter method. In addition to water, the heating adsorption regenerative drying technology is adopted. At the same time, in order to improve the efficiency of regenerative drying, the dryer also adopts vacuuming technology to improve the vacuum of the dryer. To activate the regeneration function of the molecular sieve in the dryer, and the technical requirements of the oil mist of the refrigerant are cleared by the purification process.
(3) The air-cooled liquefaction device is used to liquefy the gaseous refrigerant using the principle of an air-conditioning condenser.
(4) Using liquid storage tank and magnetic induction liquid level transfer technology, through liquid level induction, when the liquid level of the liquid storage tank reaches a certain amount, the system automatically transfers the refrigerant to ensure that the recovered refrigerant enters the refrigerant in liquid form. Centralized supply system, the liquid storage tank has a minimum liquid level, and when the refrigerant reaches the minimum liquid level, the system transfer operation is automatically closed.
(5) Adopt PLC centralized control mode, GOT full Chinese operation interface, in order to realize man-machine dialogue; control system can automatically monitor the working status of each part of the system, and has a warning function.
The working principle of the equipment and the technical performance of the equipment. After the quick connector installed on the recovery port of the device is connected with the quick connector on the workpiece, the device is started, and the pressure sensor located on the recovery pipe of the device simultaneously senses the dynamic residual pressure in the recovered workpiece, and the device Compared with the set pressure value, since the refrigerant in the workpiece is recovered in the form of a gas-liquid mixture, the refrigerant in the workpiece is recovered after being cooled for a period of time, and the diffusion rate of the refrigerant after vaporization will not keep up. The speed, therefore, according to this situation, in order to fully recover the refrigerant, while considering the energy consumption relationship, the equipment in the initial recovery stage, the first and second stage compressors will start at the same time, when the pressure sensor installed on the equipment recovery pipe detects When the dynamic pressure on the pipeline is lower than the default value of the equipment, the secondary compressor stops working, the primary compressor continues to work, and the refrigerant in the workpiece is compressed into the pipeline between the primary and secondary compressors. When the workpiece is recovered, the recovery speed will be slowed down, so that the residual liquid refrigerant in the workpiece is fully liquefied, while the secondary compressor inlet The pressure will gradually increase, and the process will be forced to hold for two minutes. After two minutes, if the dynamic pressure on the pipeline is greater than the default value of the equipment, the secondary compressor will restart and the equipment will continue to recover quickly until the pipeline When the dynamic pressure value above reaches the set minimum residual pressure value, the equipment recovery work is completed.
The setting of this recycling program effectively ensures that the refrigerant in the recovered workpiece can be fully recovered. At the same time, the intermittent operation of the secondary compressor can reduce the differential pressure of the secondary compressor inlet and outlet and reduce the operation of the secondary compressor. Time, effectively reducing the heat generation of the secondary compressor, has a good effect on extending the service life of the secondary compressor.
In order to ensure that the finally recovered refrigerant enters the refrigerant centralized supply system in liquid form, the gaseous refrigerant is dried and filtered and then liquefied into an air-cooled condensing system, and the liquid refrigerant after liquefaction is temporarily stored in the liquid storage tank of the equipment itself. When the liquid level of the liquid storage tank reaches a certain amount, the system will automatically transfer the refrigerant. The liquid storage tank also has the lowest liquid level. When the refrigerant reaches the minimum liquid level, the system transfer operation is automatically closed.
In practical applications, in order to improve the recovery rate of the refrigerant and the economic benefits of the equipment, we set the recovery port of the equipment to two, which can be connected to the air valve and the liquid valve of the air conditioner, and simultaneously recycle the air conditioner compressor or simultaneously The two workpieces are recycled. Considering the recovery rate and economic benefits of the refrigerant, the default value of the dynamic pressure of the equipment used by our company is set to 0103MPa, and the minimum residual pressure value is set to 01005MPa. The refrigerant recovery rate of the lower workpiece can reach 95%.
Quality Analysis of Recycled Refrigerant We have carried out sampling analysis of the recovered refrigerant. The test sample used is: the refrigerant recovered after being used by the refrigerant recovery machine after use, the detection quantity is 3kg. The results are shown in Table 1: The technical requirements of the serial number test items are colorless, no turbidity, no odor, no odor, qualified purity, water evaporation residue, acidity results. The above test results are in accordance with the requirements of GB7373-87 excellent products, and the test results meet the requirements for use.
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