RU1776942C - Air turbine refrigerating plant - Google Patents

Abstract

Usage: refrigeration equipment and technological processes for freezing bulk light product (tea leaf, etc.) Summary of the invention: the installation comprises a compressor (1), a turboexpander (2). regenerator unit (18) with valve boxes (6 and 7) for switching regenerators (4 and 5) and a cleaning unit (17) with valve boxes (11 and 12) for switching filters

Description

Figure 1

The invention relates to refrigeration technology and can be used in technological processes of freezing a loose light product, which is of great importance to the ratio of surface to mass, for example, tea leaf.

A well-known air turbo-refrigeration unit comprising a compressor with an outlet bypass valve, a turboexpander, a regenerator unit with regenerator switching valve boxes, and a cooling chamber.

When the machine is used in the processing of a tea leaf, ablation from the freezing chamber of a light fraction of the tea leaf is observed from the freezing chamber. This leads to an increase in the hydraulic resistance of the tract and reduces the air flow through the turbocharger, which leads to compressor malfunction.

The aim of the invention is to increase operational reliability and increase the duration of operation.

This goal is achieved by the fact that the installation is equipped with an air purification unit, consisting of two parallel-mounted filters with filter switching valve boxes and a switching tap, and the cold air outlet from the regenerator block is connected through the switching tap to the inlet to the refrigerating chamber, the outlet from the refrigerating chamber is connected through an air purification unit and a switching valve to a turbo expander, and the compressor outlet is connected through a bypass valve and an air purification unit to the atmosphere.

In FIG. 1 shows a diagram of the proposed installation.

The installation consists of a compressor 1, a turboexpander 2 located on one shaft, a drive motor 3, a block of regenerators 18, consisting of two regenerators 4 and 5, two valve boxes of regenerators 6 and 7, a cooling chamber 8, a cleaning block 17, consisting of two filters 9 and 10 and two filter switching valve boxes 11 and 12, a filter cleaning valve 13 for the bypass valve box, which serves to bring the machine to operating mode 14, an inlet fan 15 with an electric motor 16, a frame 19, a multiplier 20 and bellows 21.

In FIG. 2 shows an approximate layout of the proposed installation. On the horizontal frame 19 to the right, when viewed from the side of the drive motor 3, there are longitudinally arranged multipliers 20, a compressor 1 and a turboexpander 2, two are installed parallel to each other to their left

regenerator 4 and 5, combined with two valve boxes 6 and 7 in the block of regenerators 18, deployed at an angle of 45 ° to the horizontal surface. For the cold

valve box 7 is located valve box bypass 14. In the space between the frame 19 and the boxes 7 and 14 in the transverse direction there is a cleaning unit 17, consisting of two filters 9 and 10

0 and two valve manifolds 11 and 12. On the right, between the turboexpander and regenerator 5, there is a filter cleaning valve 13. Above the drive electric motor, inlet fans 15 with electric motors 16 and a heat exchanger 22 are installed on the separate frame. The air pipes are connected by bellows 21. Such an arrangement of the cleaning device fits into the dimensions of the air turbo 0 refrigeration machine TXM1-50 developed by SKTBA. The installation kit also includes a refrigerator 8, an electric cabinet and a control cabinet (not shown in Fig. 2). The installation works as follows.

Atmospheric air with a temperature of about 20 ° C is supplied by the fan 15 through the valve box 6 to one of the regenerators, for example, to the regenerator 4, where

0, it is cooled to a temperature of about minus 80 ° C and dried (atmospheric moisture falls on the cold nozzle of the regenerator). Next, cold, dried air through the valve box 7 and the box

5, bypass 14 enters the refrigerator compartment, which is a device for quickly freezing tea leaves or an assembly for removing loose rubber technical products. By cooling the product in the chamber, air with inclusions of a light fraction of the frozen product (small tea leaf or crushed region of rubber technical products) through the valve box 11

5 is fed into one of the filters 9 of the cleaning unit 17, where it is cleaned of the product and through the valve box 12 and the bypass box 14 goes to the inlet of the turboexpander 2, expands to about 0.5 atm and is cooled

0 to minus 84 ° C and through the valve box 7 enters the regenerator 5, cools its nozzle and is saturated with moisture previously deposited in the regenerator. Then air with a temperature of approximately 16 ° C through the valve

5, box b enters compressor 1, is compressed therein to a pressure close to atmospheric pressure, and is pushed through the cleaning box 13 into the atmosphere. After a certain period of time, for example after 60 s, valve boxes 6 and 7

are switched and then air from the atmosphere enters the regenerator 5, cooled in the previous period, and the regenerator 4 is charged with cold. When filling the filter 9, the valve boxes 11 and 12 are switched, and then the air from the refrigeration chamber will go to the second filter 10. In order to clean the filter 9, turn the cleaning valve 13 and the compressed air from the compressor 1 through the valve 13 and the box 12 counter-flow into the filter 9 and through the valve box 11 removes the fine product deposited on the filter. Blowing (cleaning) the filter in time takes a shorter period than filling the filter with the product. The crane 13 returns to its original position. The bypass box 14 operates only during the period when the installation is in operation. With its help, the refrigerator 8 and the cleaning device are disconnected from the air path of the turbo-refrigeration machine.

Claims (1)

SUMMARY OF THE INVENTION An air turbo-refrigeration unit comprising a compressor with an outlet vent valve; a turboexpander, a regenerator unit with regenerator switching valve boxes and a cooling chamber, characterized in that, in order to increase operational reliability and increase the operating time, the installation is equipped with an air purification unit consisting of two filters in parallel with filter switching valve boxes and a switching valve moreover, the cold air outlet from the regenerator unit is connected via a switching tap to the inlet to the refrigerating chamber, the outlet from the refrigerating chamber is connected through the air purification unit and the switching tap to turbo-expander, and the outlet from the compressor is connected via the bypass valve and the air purification unit to the atmosphere. V 16 in 22/5 Phage 2