Evaporative cooling refrigerating system of direct cooling type centrifugal compressor

Abstract

The utility model relates to the technical field of refrigerating systems, in particular to a direct cooling type centrifugal compressor evaporative cooling refrigerating system which comprises a composite evaporative condenser, a centrifugal refrigerating compressor, a composite separator, an evaporator, a refrigerant pump set, an economizer and a plurality of connecting pipelines. The combined type evaporative condenser is connected with the economizer through a connecting pipeline, a gas phase layer of the combined type separator is connected with an inlet of the centrifugal refrigeration compressor through a connecting pipeline, and refrigerant liquid in the combined type evaporative condenser is conveyed to the evaporator in the technological process through the refrigerant circulating pump. The refrigerant directly cools the original materials in the evaporator, the refrigerant directly cools the chemical original materials, and the problems that a traditional refrigerating unit cannot directly cool the materials through the refrigerant, and the refrigerating cost is high are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, in particular to a direct cooling centrifugal compressor evaporative cooling refrigeration system. Background Art

[0002] At present, many chemical process flows, such as polysilicon production lines, involve using low-temperature (less than -25 degrees) refrigeration units to cool materials in the process. In traditional refrigeration systems, the purpose of cooling the original materials is often achieved by using screw refrigeration units to prepare lower chilled water to exchange heat with the original materials. In this refrigeration system, the refrigeration compressor is a screw compressor, the condenser is usually a shell and tube water-cooled condenser, the refrigerant is mostly R507C, and the coolant on the evaporator side is mostly a high-concentration ethylene glycol solution.

[0003] This traditional low-temperature refrigeration system has the following shortcomings:

[0004] 1. In the cooling process, low-temperature ethylene glycol is used to cool the original material again, and its heat exchange efficiency is low. At the same time, a lower water temperature requirement is put forward for the refrigeration host, and the energy consumption of the host is very high;

[0005] 2. The condenser of the traditional refrigeration main unit is mainly a shell and tube water-cooled condenser, which is usually used in conjunction with a cooling tower in the refrigeration system. It is necessary to add a water system such as a water pump and a cooling tower. Affected by the environment and the cooling tower, the cooling water system in this form usually consumes a lot of energy, and the condensing pressure of the refrigeration unit is relatively high.

[0006] 3. Traditional refrigeration units are often skid-type refrigeration units containing compressors, evaporators, and condensers. This type of unit cannot achieve the purpose of directly cooling materials with refrigerants on site.

[0007] 4. In addition, when the refrigeration compressor is used in conjunction with evaporative cooling, it is usually a screw refrigeration compressor used in conjunction with evaporative cooling. At the same time, a larger separate buffer tank will be provided in the refrigeration system for storing refrigerant, which greatly increases the complexity of the system and increases the cost of the entire refrigeration system. Utility Model Content

[0008] The utility model aims to provide a direct cooling centrifugal compressor evaporative cooling refrigeration system to solve the problem that the traditional refrigeration unit cannot use the refrigerant to directly cool the material and the refrigeration cost is high.

[0009] In order to achieve the above-mentioned purpose, the basic scheme of the utility model is as follows: a direct cooling centrifugal compressor evaporative cooling refrigeration system, including a compound evaporative condenser, a centrifugal refrigeration compressor, a compound separator, an evaporator, a refrigerant pump group, an economizer and a plurality of connecting pipes, the centrifugal refrigeration compressor is connected to the compound evaporative condenser through a connecting pipe, the compound evaporative condenser is connected to the economizer through a connecting pipe, the gas channel of the economizer is connected to the air supply port of the centrifugal refrigeration compressor through a connecting pipe, the liquid channel of the economizer is connected to the compound separator through a connecting pipe, the gas phase layer of the compound separator is connected to the inlet of the centrifugal refrigeration compressor through a connecting pipe, the liquid phase layer of the compound separator is connected to the refrigerant pump group through a connecting pipe, the refrigerant pump group is connected to the evaporator through a connecting pipe, and the evaporator is connected to the compound separator.

[0010] Furthermore, the refrigerant of the centrifugal refrigeration compressor is R134a refrigerant.

[0011] Furthermore, an electric throttle valve is provided on the connecting pipe between the compound evaporative condenser and the economizer.

[0012] Furthermore, a one-way valve is provided on the connecting pipe between the centrifugal refrigeration compressor and the compound evaporative condenser.

[0013] Furthermore, the refrigerant pump group includes a plurality of shielded pumps, and the plurality of shielded pumps are connected in parallel.

[0014] The beneficial effects of this solution are as follows: (1) This solution adopts a composite separator, which can fully separate the gas-liquid mixed refrigerant from the evaporator and enter the centrifugal refrigeration compressor after separation, thereby preventing the centrifugal refrigeration compressor from sucking liquid into the air; in addition, the composite separator also receives the refrigerant liquid after re-throttling from the economizer as a primary buffer. The buffered liquid is transported to the evaporator through the refrigerant pump group, replacing the liquid storage tank or buffer tank in the traditional system.

[0015] (2) This scheme adopts a compound evaporative condenser to condense the high-pressure gas discharged from the centrifugal refrigeration compressor to form a condensed refrigerant liquid; the compound condenser is a compound air cooler with both air cooling and water cooling, which can be switched according to the ambient temperature. The compound evaporative condenser replaces the water-cooled shell and tube condenser. On the one hand, it improves the compressor efficiency and reduces energy consumption. On the other hand, it saves the system's circulating water consumption, which has significant economic benefits, especially in water-scarce areas such as Northwest my country.

[0016] (3) The economizer collects the throttled refrigerant and separates the gas and liquid. The refrigerant gas is fed into the centrifugal refrigeration compressor, and the refrigerant liquid enters the next electric throttle valve and then enters the composite separator.

[0017] (4) The refrigerant liquid in the compound evaporative condenser will be transported to the evaporator in the process flow through the refrigerant circulation pump, and the refrigerant will directly cool the original material in the evaporator. The refrigerant directly cools the chemical original material, which improves the heat exchange efficiency and achieves energy saving and consumption reduction of the entire system.

[0018] (5) This solution uses environmentally friendly refrigerant R134a.

[0019] (6) The use of a shielded pump enables low-temperature, low-pressure liquid refrigerant to be continuously delivered to the evaporator to cool the material, ensuring the operational stability of the entire refrigeration production line while also improving the energy regulation capability of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of system connection relationship of an embodiment of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The reference numerals in the drawings of the specification include: compound evaporative condenser 1, centrifugal refrigeration compressor 2, compound separator 3, evaporator 4, refrigerant pump group 5, economizer 6, non-return valve 7, electric throttle valve 8.

[0023] Example

[0024] Basically as attached Figure 1As shown: a direct cooling centrifugal compressor evaporative cooling refrigeration system, including a compound evaporative condenser 1, a centrifugal refrigeration compressor 2, a compound separator 3, an evaporator 4, a refrigerant pump group 5, an economizer 6 and a plurality of connecting pipes. The refrigerant of the centrifugal refrigeration compressor 2 is R134a refrigerant. The centrifugal refrigeration compressor 2 is connected to the compound evaporative condenser 1 through a connecting pipe. A one-way valve 7 is provided on the connecting pipe between the centrifugal refrigeration compressor 2 and the compound evaporative condenser 1. The compound evaporative condenser 1 is connected to the economizer 6 through a connecting pipe. The compound evaporative condenser 1 An electric throttle valve 8 is provided on the connecting pipeline between the economizer 6, the gas channel of the economizer 6 is connected to the air supply port of the centrifugal refrigeration compressor 2 through a connecting pipeline, the liquid channel of the economizer 6 is connected to the compound separator through a connecting pipeline, the gas phase layer of the compound separator is connected to the inlet of the centrifugal refrigeration compressor 2 through a connecting pipeline, the liquid phase layer of the compound separator is connected to the refrigerant pump group 5 through a connecting pipeline, the refrigerant pump group 5 is connected to the evaporator 4 through a connecting pipeline, the refrigerant pump group 5 includes a plurality of shielded pumps, and the plurality of shielded pumps are connected in parallel, and the evaporator 4 is connected to the compound separator 3.

[0025] The specific implementation process is as follows: the centrifugal refrigeration compressor 2 compresses the refrigerant and enters the compound evaporative condenser 1, the compound evaporative condenser 1 condenses the high-pressure gas discharged from the centrifugal refrigeration compressor 2 to form a condensed refrigerant liquid, the economizer 6 collects the throttled refrigerant and realizes gas-liquid separation, the refrigerant gas replenishes air into the centrifugal refrigeration compressor 2, and the refrigerant liquid enters the next-level electric throttle valve 8 and then enters the compound separator 3, the compound separator 3 fully separates the gas-liquid mixed refrigerant from the evaporator 4, and enters the centrifugal refrigeration compressor 2 after separation, which plays a role in preventing the centrifugal refrigeration compressor 2 from inhaling liquid; in addition, the compound separator also receives the refrigerant liquid after throttling again from the economizer 6 as a buffer, and the buffered liquid is transported to the evaporator 4 through the refrigerant pump group 5, and the refrigerant directly cools the original material in the evaporator 4, and the refrigerant directly cools the chemical original material, thereby improving the heat exchange efficiency and realizing energy saving and consumption reduction of the entire system.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. Direct cooling centrifugal compressor evaporative cooling refrigeration system, characterized by: It includes a compound evaporative condenser, a centrifugal refrigeration compressor, a compound separator, an evaporator, a refrigerant pump group, an economizer and several connecting pipes. The centrifugal refrigeration compressor is connected to the compound evaporative condenser through a connecting pipe, the compound evaporative condenser is connected to the economizer through a connecting pipe, the gas channel of the economizer is connected to the air supply port of the centrifugal refrigeration compressor through a connecting pipe, the liquid channel of the economizer is connected to the compound separator through a connecting pipe, the gas phase layer of the compound separator is connected to the inlet of the centrifugal refrigeration compressor through a connecting pipe, the liquid phase layer of the compound separator is connected to the refrigerant pump group through a connecting pipe, the refrigerant pump group is connected to the evaporator through a connecting pipe, and the evaporator is connected to the compound separator.

2. The direct cooling centrifugal compressor evaporative cooling refrigeration system according to claim 1 is characterized in that: The refrigerant of the centrifugal refrigeration compressor is R134a refrigerant.

3. The direct cooling centrifugal compressor evaporative cooling refrigeration system according to claim 2 is characterized in that: An electric throttle valve is arranged on the connecting pipeline between the compound evaporative condenser and the economizer.

4. The direct cooling centrifugal compressor evaporative cooling refrigeration system according to claim 3 is characterized in that: A one-way valve is arranged on the connecting pipe between the centrifugal refrigeration compressor and the compound evaporative condenser.

5. The direct cooling centrifugal compressor evaporative cooling refrigeration system according to claim 1, characterized in that: The refrigerant pump group includes a plurality of shielded pumps, and the plurality of shielded pumps are connected in parallel.

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