JPH01315690A - Dry type screw compressor incorporated with exhaust heat recovery device - Google Patents

Abstract

PURPOSE:To aim at sufficiently cooling a compressor and at recovering exhaust heat by circulating a water solution as a coolant through two systems, and by recovering exhaust heat obtained by exchange of heat with the water solution in a form of a high temperature hot water. CONSTITUTION:Air purified by an air-filter and having passed successively through a lower pressure stage compressor body 2, an intermediate stage primary side air-cooler 4 and an intermediary stage cooler 5 flows from a discharge air check-valve 9 at a discharge port 15 into a discharge stage primary air-cooler 6 and a discharge stage air-cooler 7, and is then fed under pressure from the discharge port 15 into a process station. In this arrangement, a water solution in a tank 11 is circulated from a water pump 10 through two systems. That is, the water solution in one of the system is fed into the cooler 7, 5 and an oil cooler 8. While the water solution in the other of the system is fed into the coolers 6, 4 through a flow metering valve 12. Further, the water solution is returned into the tank 1 through a hot water recovery unit 13 and a high temperature hot water recovery unit 14.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dry screw compressor with a waste heat recovery device, which can effectively recover heat even when high-quality cooling water is not available. [Conventional technology] Regarding a dry screw compressor with a PA waste heat recovery device suitable for carrying out the following: As a conventional technology that utilizes the retained heat of heated waste water after being used for cooling, there is a conventional technology disclosed in '# 150949/1983. As described in , the cooling water as a cooling medium is not circulated in a closed forced circulation, but is supplied with cooling water.

[Problem to be solved by the invention]

For dry screw compressors that require cooling, if the quality of the water used for cooling in the summer is poor, rust and sludge generated by corrosion may cause premature failure of the cooler and cause problems.
There was a problem with the maintenance of the compressor.

Furthermore, the waste heat from the dry screw compressor that is transferred to the cooling medium is currently being discharged as is.

The object of the present invention is to provide a dry screw compressor equipped with a waste heat recovery device that can perform sufficient cooling even when high-quality cooling water is not available, and can recover waste heat from the compressor as hot water or still hot water. The aim is to provide the opportunity.

[Means to solve the problem]

The purpose is, for example, to forcibly circulate a non-polluting aqueous solution containing propylene glycol as a main component with a low freezing temperature and weak corrosiveness as a cooling medium in two systems using a water pump, and by exchanging heat with this aqueous solution. Pressure M
This is achieved by installing a heat exchanger that recovers waste heat from E-iso as hot water and high-temperature water.

[Effect]

In the present invention, a water pump is used to supply a non-polluting aqueous solution with a low freezing temperature and weak corrosivity to two systems in a sealed state.
It separates the throat and causes strong rli'II circulation, preventing the proboscis from entering from the outside.

Then, one of the two systems cools the air cooler, oil cooler, and jacketed casing that require 11 cooling, and the other system cools the V′i primary′1j
tlI air cooler cooling.

Further, by providing a heat exchanger between the warmed aqueous solution 2 and the high temperature aqueous solution, the waste heat of the compressor transferred to the aqueous solution can be recovered as hot water and high temperature water.

〔Example〕

Hereinafter, an uninvented embodiment will be explained with reference to FIG. 1. The dry screw compressor V with a waste heat recovery device, the air filter I, and the low-pressure stage compressor main body 2 of the embodiment shown in FIG. , the high-pressure stage side compressor main body 3, and the intermediate stage primary 91! I air cooler house, intermediate stage air cooler 5, discharge stage primary air cooler 6, discharge stage air cooler 7, oil cooler 8, discharge air check valve 9, water pump 10, an aqueous solution tank 11, an aqueous solution flow rate adjustment valve 12, a hot water recovery device 13, and a high temperature water recovery device lΦ.

The hot water recovery device 18 is provided with a set of a cooling water supply port 1t5 and a hot water discharge port 17, and the high temperature water recovery device 14 is provided with a set of a cooling water supply port 18 and a high temperature water discharge port 19.
(There is.

The G3 dry screw compressor with heat recovery device of the above embodiment is operated and functions as follows.

The air purified by the air filter 1 is compressed to an intermediate pressure by the low-pressure stage compressor main body 2, and then
After being cooled by the next side air cooler 4 and the intermediate stage air cooler 5, it enters the high pressure stage side compressor main body 8, is compressed to the discharge pressure, and passes through the discharge air reverse valve 9 to cool the discharge stage primary side air. It is cooled by the container 6 and the discharge stage air cooler 7, and is then pumped through the discharge port 15 to the process.

High-temperature air of approximately zoo'c enters the intermediate stage primary air cooler 42 and the discharge stage primary air cooler 6, and after cooling it, the intermediate stage air cooler 5 and the discharge stage air cooler 6 enter the intermediate stage primary air cooler 42 and the discharge stage primary air cooler 6. 7 to cool the air temperature to about 45°C.

In addition, the oil cooler 8 cools the lubricating oil that is supplied to the bearings and gears of the compressor body and is discharged.
Since the main body 2 and the high-pressure stage side compressor main body 3ri reach high temperatures, they are cooled by a jacketed casing.

A non-polluting aqueous solution containing propylene glycol as a main component, which has a low freezing temperature and is weakly corrosive, in the aqueous solution tank 11 is forcibly circulated into two systems by a water pump lOK.

In one system, the aqueous solution is sent to the discharge stage nitrogen cooler 7, the intermediate stage air cooler 5 and the oil cooler 68 for cooling, and the aqueous solution sent to the oil cooler 8 is compressed on the high pressure stage side. Aircraft body 3's? and the jacket of the lateral pressure WI machine body 2 of the low-pressure stage are cooled, merged, and then discharged.

In one system, the flow rate of the aqueous solution is adjusted by the aqueous solution flow rate adjustment valve 12 so that it can be recovered as high-temperature water, and the aqueous solution is sent to the primary side air cooler 6 of the discharge stage and the primary 1ill air cooler 54 of the intermediate stage. The heat is recovered and cooled, and then it is combined and discharged.

The aqueous solution that has received the waste heat from the compressor is recovered as hot water! 13 and a high temperature water recovery device 14, the aqueous solution tank 1
Return to 1. The cooling water enters the hot water recovery device 18 and the high temperature water recovery device 14 from the cooling water supply ports 16 and 18, recovers the waste heat of the pressurizer, and passes through the hot water outlet 17 and the high temperature water outlet 1.
9 pieces are discharged.

According to this embodiment, even if good quality cooling water is not available f'L, further cooling can be performed and waste heat from the compressor can be recovered as hot water and high temperature water.

〔Effect of the invention〕

According to the present invention described above, the water pump
A non-polluting aqueous solution with low freeze production and weak corrosiveness is forcedly circulated in two systems in a sealed state to prevent +WJ material from entering from the outside, which increases contamination, and one of the two systems is In one system, the air cooler, oil cooler, and jacketed casing that require cooling are cooled, and in the other system, the primary air cooler is cooled, and the heated aqueous solution and high temperature are cooled. By providing a heat exchanger with the aqueous solution, the waste heat from the compressor transferred to the aqueous solution can be recovered as hot water and high-temperature water. It can be used as a heating source for hot water pools, etc., or as an auxiliary heat source for heating, and has the effect of saving energy.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing one embodiment of the present invention.
Low pressure stage compressor body 3... High pressure stage side compressor body
5. Intermediate stage primary air cooler 5. Intermediate stage air cooling 6 6. Discharge stage primary air cooler 7.
・Discharge stage air cooling! 10...Water pump 11...Aqueous solution tank 13...Hot water recovery a
14...High temperature water recovery device. Agent Masaru Masaru Ogawa Tachibana-7'

Claims (1)

[Claims] 1. In dry screw compressors with air coolers, oil coolers, and jacketed casings that require cooling, water pumps are used to separate the systems into two systems using a non-polluting aqueous solution with a low freezing temperature and low corrosivity as the cooling medium. 1. A dry screw compressor with a waste heat recovery device, characterized in that a heat exchanger is provided for forcing circulation through the aqueous solution and recovering the waste heat of the compressor as hot water and high-temperature water by heat exchange with the aqueous solution.