JPH04334775A - Self-pressure type impeller cleaning system for centrifugal compressor - Google Patents

Abstract

PURPOSE:To prevent a compressor from being deteriorated in performance and being corroded due to dust or the like adhering to the rotating impeller of the compressor, utilizing compressed air at the final stage of the compressor as a pressurizing source in a system which jets cleaning liquid. CONSTITUTION:A self-pressure type impeller cleaning system is provided with a cleaning liquid tank 17, piping for feeding cleaning liquid to it, piping for feeding air for pressurizing process from the final stage of a compressor 18, piping for feeding cleaning water to the casings at respective stages of the compressor 18 from the tank 17, and valves 11-15 for controlling fluid in these piping.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller cleaning system for all centrifugal compressors.

0002

2. Description of the Related Art A conventional centrifugal compressor impeller cleaning system uses a high-pressure pump to pressurize cleaning fluid. Unless the company already has existing high-pressure pump equipment, the high-pressure pump and its attached equipment are constructed as a unit, and other companies are also adopting a similar method. There is no example of a system that pressurizes using the pressure of the compressor itself.

0003

In the conventional system, a large amount of pump operation equipment is required due to the use of a high pressure pump. Examples include a drive machine for pump operation, a drive power source, a steam generator, a drive control panel, a tank for cleaning liquid, a pump protection device, a pressure control device, etc.

The problems to be solved by the present invention are as follows.

(1) A large amount of cost is required to construct the above-mentioned system.

(2) Pump performance changes and mechanical operating conditions differ depending on the cleaning liquid, so a pump must be selected depending on the liquid, and the characteristics of the cleaning liquid cannot be easily changed. Can not.

(3) Due to the cleaning cycle, there is a high possibility that the pump will be started and stopped repeatedly, which has a large effect on the life of the cleaning system.

(4) In the case of a compressor with multiple impellers,
Since the spraying pressure of the cleaning liquid differs depending on each impeller,
Pressure control must be performed for the number of impellers.

(5) Special power is required for system operation.

An object of the present invention is to pressurize the cleaning liquid by using only a pressure source generated by a compressor without relying on mechanical power.
The purpose is to eliminate dirt on the impeller, which can cause serious damage to the compressor.

[0011]

[Means for Solving the Problems] A feature of the present invention is that the pressure of high-pressure gas obtained by operating a compressor is used to extrude the cleaning liquid previously filled in a pressurized tank to the impeller from the suction port of the compressor. It's about spraying.

Furthermore, even when there are a large number of impellers, pressure control can be eliminated by simply installing a fixed throttling mechanism and an on-off valve in series in the piping so that the pressure can be adjusted according to each impeller.

[0013]

[Operation] By pressurizing the cleaning liquid using the gas pressure of the compressor itself, it is possible to prevent an emergency stop of the system due to mechanical failure of the pump, etc., and the reliability of the system can be improved.

Furthermore, since the equipment configuration is simple, automation can be easily achieved, manufacturing costs can be reduced, and the costs required for system operation can be completely eliminated.

[0015]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows an example in which the present invention is applied to a four-stage centrifugal compressor having four impellers. This compressor has a structure in which gas is sucked in by a single-stage impeller 1, then discharged through a second-stage impeller 2, a third-stage impeller 3, and finally from a four-stage impeller 4. The gas discharged from is at a constant pressure. Further, the suction pressure at each stage is lower than the discharge pressure.

The cleaning system includes a pressurized tank 16, piping,
It is composed of an on-off valve, a certain throttle mechanism 10, and an injection nozzle 5. The cleaning liquid 17 filled in the pressurized tank 16 is
It is pressurized by a four-stage discharge pressure and pushed toward the compressor. The extruded cleaning fluid passes through a constant throttle mechanism designed to reduce the pressure to a pressure suitable for cleaning each of the impellers 1 to 4, and is sprayed onto the impellers from the injection nozzle 5. This series of operations allows the impeller to be cleaned during operation.

First, the valves 12 and 13 are opened, the other valves are closed, and the cleaning liquid is supplied to the pressurized tank. When the pressurized tank is filled with a specified amount of cleaning liquid, valves 12 and 1 are closed.
3 and open valves 14 and 11. Next, the valves 6 are opened in order from the first stage to start the first stage of cleaning. After cleaning for a certain period of time, valve 6 is closed. Repeat this operation 2 to 4 times. When cleaning of all stages is completed, all valves are closed, valves 12 and 15 are opened, and the pressure inside the system is reduced. In this embodiment, each valve operation is performed manually, and the amount of cleaning liquid in the pressurized tank 16 can be confirmed with a level meter attached to the side surface of the pressurized tank.

During compressor operation, the suction pressure and discharge pressure of each stage are constant, so once the diameter of the throttling mechanism 10 of each stage is determined, the pressure can be adjusted simply by opening and closing the valves. It is not necessary and the impeller cleaning operation can be performed very easily. Further, since the pressure does not rise above the compressor discharge pressure, the design of the pressurized tank is easy and safety is enhanced.

In the above embodiment, each valve may be an electromagnetic on-off valve and a timer circuit may be used to achieve fully automatic operation.

Further, in the above-mentioned embodiment, the pressure is applied using four stages of discharge pressure, but cleaning may be performed using each stage of discharge pressure. (For example, the first-stage impeller 1 is cleaned with a cleaning liquid pressurized by the first-stage discharge pressure.) With this method, the piping for the cleaning liquid of the first-stage impeller 1 and the second-stage impeller 2, which are at low pressure, is Since the withstand voltage can be lowered, the cost can be further reduced.

[0022]

[Effects of the Invention] According to the present invention, a compressor impeller cleaning system that is inexpensive and highly reliable can be manufactured. Moreover, since it is relatively easy to operate and easy to automate, it is highly effective as a system for preventing compressor performance deterioration and impeller corrosion.

[Brief explanation of drawings]

FIG. 1 is an operation system diagram showing an embodiment of a compressor and impeller cleaning system.

[Explanation of symbols]

1... Single-stage impeller, 2... Two-stage impeller, 3... Three-stage impeller, 4
...four-stage impeller, 5...cleaning nozzle, 6...single-stage on-off valve, 7...
Two-stage on-off valve, 8... Three-stage on-off valve, 9... Four-stage on-off valve, 10...
Fixed throttle mechanism, 11... Pressure valve, 12... Air discharge valve, 13... Cleaning liquid supply valve, 14... Cleaning source valve, 15... Drain valve, 16...
Pressurized tank, 17...Cleaning liquid, 18...Compressor, 19...Level meter.

Claims (1)

[Claims] Claim 1: A high-pressure pressurizing tank is filled with impeller cleaning liquid, and the liquid in the pressurizing tank is pressurized by the discharge pressure of the compressor itself to be cleaned, and the liquid is applied to the suction side of the compressor. This is a liquid pressurization system that sprays cleaning liquid onto the impeller through a cleaning nozzle provided therein.