Online backwashing system and method for heat exchanger

Abstract

The invention relates to the technical field of heat exchanger cleaning, in particular to an online backwashing system and method for a heat exchanger. The system comprises a heat exchanger body, a high-temperature water inlet pipe, a high-temperature water outlet pipe, a low-temperature water outlet pipe and a low-temperature water inlet pipe. The high-temperature water inlet pipe is provided with a first shut-off valve, a first exhaust valve and a first pressure meter, and the high-temperature water outlet pipe is provided with a second shut-off valve, a firs water release valve and a secondpressure meter. A third shut-off valve, a second water release valve and a third pressure meter are mounted on the low-temperature water inlet pipe, and a fourth shut-off valve, a second exhaust valve and a fourth pressure meter are mounted on the low-temperature water outlet pipe. By control of open and shut valves, the exhaust valves and the water release valves, high-speed washing of impurities and water scale on heat exchange plates can be realized through reverse cycling of intrinsic online fluid of a heat exchanger system, disassembly of the heat exchange is avoided, and external poweror consumption of chemical agents for washing are avoided; in addition, long-time halting is avoided, and scaling of the heat exchanger can be effectively eliminated and prevented.

Description

technical field The invention relates to the technical field of heat exchanger cleaning, in particular to an online backwashing system and a washing method for a heat exchanger. Background technique With the rapid development of central heating and central air conditioning, heat exchangers are increasingly used in heat exchange systems. Due to the complex structure and narrow space of the flow channel in the heat exchanger, some blockage and fouling problems often occur during the use of the heat exchanger. However, several commonly used heat exchanger cleaning technologies still have the following problems in use: 1. The chemical cleaning method, after the heat exchanger is disassembled, the plates are soaked with chemical agents, the dirt is dissolved and then peeled off. This method needs to stop using the heat exchanger for a long time, and cannot be used during the operation of the equipment. Long-term use has negative effects on the equipment. It is corrosive to a ...

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Problems solved by technology

3. After the plate is disassembled, use a hard object to directly peel off the dirt. Long-term use of this method will easily cause the plate of the heat exchanger to perforate and cannot be used normally.

4. The above method is usually used after the heat exchanger is found to be fouled, which cannot prevent the fouling of the heat exchanger and requires a long shutdown

5. Due to the exhaust pipe and drain pipe installed on the inlet and outlet pipes of the heat exchanger in the prior art, the caliber is only DN15-20mm, so it is impossible to discharge sewage; at the same time, the heat exchanger lacks systematic monitoring means during operation, so it cannot be timely Determine its blockage and fouling status, and clean it up in time; moreover, in the prior art, the exhaust pipe and the drain pipe installed on the inlet and outlet pipes of the heat exchanger are usually connected together by a pipe, which is led to the drain outlet collectively, resulting in The medium inside the heat exchanger cannot be vented

The above defects make it difficult to realize online cleaning and maintenance of the heat exchanger

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