SU1740962A1 - Device for pulse cleaning of heat-exchange surfaces - Google Patents

Abstract

Use in heat engineering, in particular, for cleaning heat exchangers of systems of circulating water supply of industrial enterprises and thermal power plants. SUMMARY OF THE INVENTION 1 The cleaning of heat exchangers 1 and associated pipelines is carried out during the operation of the circulation pump 2 by circulating fluid around the circuit tank 3 - pump 2 - heat exchangers 1 - cooler 4 - tank. At the beginning of the cleaning, the pump is turned on, and the liquid is supplied from the tank 3 to the airtight container 7. After filling the valve to a certain level, the valve 10 is opened, and the check valve 6 is closed, and the liquid passes through the bypass pipe 5 to the inlet of the pump 2. The sharp increase in fluid flow through heat exchangers 1 contributes to the separation and removal of deposits in the apparatus 1 and pipelines. At the end of the outflow of fluid from the hermetic tank 7, the valve 10 is closed and the fluid is pumped from pump 11 from reservoir 3 to reservoir 7 with a nominal flow rate. 1 il. sl C

Description

w

The invention relates to a heat exchange technique and can be used for cleaning heat exchangers of water recycling systems of industrial enterprises and thermal power plants.

A device for hydropneumatic cleaning of heat exchangers is known, comprising a circulating pump for cooling water, a device for supplying compressed air with the water, and a pipeline for discharging the waste mixture into the sewer system.

A disadvantage of the known device is that it does not provide effective cleaning of the apparatus due to the uneven distribution of air in the water and the water-air mixture inside the apparatus. This makes it necessary to open the devices and perform mechanical cleaning. In addition, the use of a known device causes large amounts of water to be discharged from the system, and in the apparatus air accumulations may appear, preventing access of cooling water to a significant part of the heat exchange surfaces, increasing the hydraulic resistance of the apparatus and drastically reducing their operation.

It is also known a device for hydro-pneumatic impulse cleaning of heat exchangers containing a pulsator.

A disadvantage of the known device is that it allows the cleaning of only one heat exchanger, and only on the stand, as well as the poor quality of cleaning.

Closest to the invention is a device for pulsed cleaning of heat exchangers of circulating water supply systems, containing a group of heat exchangers, a cooler with a collecting tank, a check valve and a circulation pump, combined in a closed loop, as well as connected to the inlet circuit of the circulating pump by means of an overflow the pipeline with the valve, an airtight container, additionally connected by means of the feed pipe to the collecting tank of the cooler and equipped with source of pressure.

The disadvantages of the known device are low efficiency, complexity of design and control. The low efficiency of the known device is due to the fact that a compressor is used as a source of pressure on the cleaning fluid in a hermetic container. The air in the pressurized container, after each cycle of pressure on the fluid being cleaned, is under higher than atmospheric pressure; it has a certain potential energy, a certain part of which is lost. The complexity of the design is due to the use of a compressor as a source of pressure, as well as the use of four shut-off organs that are opened and closed at each cleaning cycle at least 9 times, which determines the complexity of the control, since a large number of cycles is necessary for complete cleaning.

The purpose of the invention is to increase efficiency and simplify the design.

The purpose of the invention is achieved by the fact that

5 in a device for pulse cleaning of heat exchangers of circulating water supply systems containing a group of heat exchangers, a cooler with a collecting tank, a check valve and

0 circulating pump, combined in a closed loop, as well as a sealed container connected to the inlet circuit of the circulating pump by means of an overflow pipe with a valve, additionally connected via a feed line to the collecting tank of the cooler and equipped with a pressure source, the latter is designed as an additional pump and posted

0 on the feed pipe.

The drawing shows a device for pulse cleaning of heat exchangers of circulating water supply systems. Pulse cleaning device

5 heat exchangers 1 contains a circulating pump 2, a collection tank 3 of a cooler 4, combined in a closed loop, and also connected to the inlet circuit of the circulating pump 2 by means of an overflow pipe 5 with a check valve 6, an airtight container 7. A sealed container 7 is connected by feed pipe 8 with a precast tank 3 cooler 4, as well as

5 by means of a discharge pipe 9 with a valve 10-by-pass pipe 5 in the section between the circulation pump 2 and the check valve 6. The feed pipe 8 is equipped with a pressure source made as an additional pump.

The device works as follows.

Cleaning heat exchangers 1 and

The 5 associated pipelines are produced during the operation of the circulation pump 2, when the cooling fluid circulates with the operating flow in a closed loop tank 3-pump 2 heat exchangers 1-cooler 4-tank3.

The initially sealed container 7 is not filled with cleaning fluid. At the time of the start of cleaning, an additional pump is turned on and the liquid from tank 3 is supplied to a sealed container 7. After the sealed container 7 is filled with cleaning liquid to a certain level and a pressure corresponding to the maximum pressure of the additional pump is created, the valve 10 opens. 6 is closed, and the cleaning fluid from the airtight container 7 through the discharge port 9, the open valve 10 and the overflow pipe 5 enters the inlet of the circulation pump 2. Liquid flow supplied to heat exchangers 1 and associated pipelines, increases dramatically compared with the flow rate provided by the circulation pump 2, since the moment the valve 10 was opened, the pressure supplied to the heat exchangers 1 liquid increases dramatically due to the summation of pressure developed by the circulation pump 2 and the pressure created in the hermetic tank 7. This dramatically increases the speed of the fluid in the heat exchangers 1 and the pipelines, and the kinetic energy increases ionalno square velocities of generality that allows separation and removal of deposits. The duration of the pulse is limited by the time that the fluid flows from the hermetic tank 7 to the overflow pipe 5, taking into account the continuous operation of the additional pump. At the end of the outflow of fluid from the airtight container 7, the valve 10 is closed and the additional pump begins to supply fluid from the collecting tank 3 only to the container

7. The check valve 6 opens and fluid from reservoir 3 begins to flow through conduit 5 to circulation pump 2, which supplies this fluid to heat exchangers 1 and then to cooler 4. The speed of fluid flow through heat exchangers 1 and pipelines decreases to operating speeds provided by the circulation pump 2. After filling the tank 7, the valve 10 reopens and the cycle repeats. The number of cycles required for cleaning is determined by the nature and intensity of the formation of deposits in the system. water supply. At the end of the cleaning, the auxiliary pump is turned off.

The use of the invention allows to increase the economy, simplify the design and control the operation of the device.

Claims (1)

Invention Formula A device for pulse cleaning of heat exchange surfaces of circulating water supply systems, containing a group of heat exchangers, a cooler with a collecting tank, a check valve and a circulation pump connected in a closed loop, as well as connected to the inlet circuit of the circulating pump by means of a bypass pipe with a valve, a sealed container communicated by means of a feed line with a coolant storage tank and supplied with a pressure source, from which increase efficiency and simplify the design, the pressure source is designed as an additional pump, and is placed on the feed line.