Scale removal equipment and method of plate heat exchanger

Abstract

The invention discloses scale removal equipment for a plate heat exchanger. The scale removal equipment comprises a plate heat exchanger body (15) and an electric control device (7), wherein the plate heat exchanger body (15) is respectively connected with an ultrasonic generating device (8) and a gas pulse generating device (10); and the electric control device (7) is connected with an energy transducer (11) and the gas pulse generating device (10). The scale removal equipment can be used for rapidly and thoroughly removing scales.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a descaling device and method for a plate heat exchanger. Background technique [0002] Plate heat exchanger is a high-efficiency heat exchange device that has been popularized rapidly in the past 10 years. Compared with traditional shell and tube heat exchangers, plate heat exchangers mainly have high heat transfer coefficient, large logarithmic average temperature difference, small footprint, It has the advantages of light weight, low price, small temperature difference at the end, heat exchange of various media and easy change of heat exchange area or process combination, etc., and has been widely used in electric power, heating, chemical and other industries. At present, fouling exists in all plate heat exchangers. After fouling, the heat exchange equipment is easy to block and has poor corrosion resistance. The following factors can cause fouling of the heat exchanger: 1. Circulating wat...

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Problems solved by technology

2. Impurities enter the pipeline. During the construction process, impurities inevitably enter the pipeline, including residual short joints of welding rods, welding slag, sand, soil and other debris. During operation, impurities enter the heat exchanger with circulating water and cause blockage

[0003] After the scale is formed in the plate heat exchanger, the heat transfer efficiency will decrease, the circulating water flow area will become smaller, and the flow resistance will increase. For every 1mm increase in equipment fouling, the heat transfer coefficient will decrease by 9-9.6%, and the energy consumption will increase by more than 10%. , which leads to a substantial increase in the operating energy consumption of the entire system and an increase in heat exchange costs

It not only causes waste of heat energy to users, affects economic benefits, but also brings many difficulties to operation, maintenance and overhaul.

Shorten the service life of the equipment, scaling will cause serious under-scaling corrosion, especially the pinhole corrosion of the plate by chloride ions, resulting in corrosion and leakage of the equipment, shortening the service life of the heat exchange equipment, and even causing the heat exchanger to advance scrapped

Due to the thinness of the plate, the plate is easily deformed during the cleaning of hard dirt, and the sealing gasket is easily damaged; in order to ensure the quality of reassembly, it must be replaced, and the maintenance cost is high

Maintenance is difficult and expensive. The current descaling method is to disassemble the plate heat exchanger and pickle it piece by piece or manually clean it. The descaling is difficult. During assembly, the sealing strip and leaking plates must be replaced, and the probability of assembly leakage is high. , high maintenance costs

At present, there is also a method of ultrasonic descaling, but ultrasonic vibration can only loosen and crack the scale. The water flow is relatively slow, so that the larger scale cannot be taken out of the heat exchanger by the water flow, and it is easy to block the plate heat exchanger

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