_ how jet vacuum pump used in chemical industry

the vacuum technology is widely used in metallurgy, chemical industry, petroleum, textile, food, pharmaceutical and other industries of decompression evaporation, crystallization, distillation, distillation, drying, concentration, dehydration, chemical absorption and vacuum negative pressure conveying material such as technology, all kinds of machining process after the application of vacuum technology to saving energy and reducing consumption, speed up the reaction, improve product quality, increase the economic benefit is also gradually formed a consensus. According to our 10 years of experience in production, development and form a complete set, expounds how to reasonably choose several typical process in various fields of jet vacuum pump problem.

a, several kinds of vacuum pump and its advantages and disadvantages of common

common vacuum pump can be divided into variable volume simple type vacuum pump and jet vacuum pump, variable displacement pump is the use of the water pump cavity volume to complete the periodic change of the suction and exhaust device, reciprocating vacuum pump, rotary vane vacuum pumps, vacuum pump, water ring vacuum pump, roots vacuum pump is belong to variable displacement type vacuum pump. Jet vacuum pump is the use of venturi effect produced by the pressure drop of the high-speed jet gas transporting to export a momentum transfer pump, water jet vacuum pump and steam jet vacuum pump.

( 1) Reciprocating vacuum pump, rotary vane vacuum pumps, vacuum pump, roots vacuum pump is to rely on gas suction piston reciprocating motion or rotation, compression side by side. Their advantages are put into use new vacuum pump is relatively high, but the pistons are moving parts, so the piston wear cannot be avoided, with the increase of maintenance times work vacuum will continue to decline, until can't satisfy the production requirements. This kind of pump work noise, fuel consumption, high failure rate is also the fatal shortcomings, need to open a backup a commonly, this virtually increases the equipment investment and running cost. In addition if use this kind of pump suction vapor can non-condensable gas, such as will make lubricating oil emulsification, therefore can only be used in the suction non-condensable sex ( Air class) Gas, also can't pump with granular medium, it also limits its scope of application.

( 2) Water ring vacuum pump is installed in the pump shell with much of the eccentricity of the rotor rotation, threw the water in the pump shell formation and pump casing concentric rings of water cycle water ring and the rotor blade formed the volume change to gas suction, compression side by side. It has the advantage of low vacuum pumping volume big, can direct suction vapor can non-condensable gas. Its disadvantage is that the vacuum degree is low; Can't pump with granular media; The rotor high-speed rotation is not easy to do the anti-corrosion treatment, so you can't pump is corrosive medium.

( 3) Jet vacuum pump working principles, advantages and disadvantages of

jet vacuum pump is the use of venturi effect produced by the pressure drop of the high-speed jet gas transporting to export a momentum transfer pump. It is divided into water jet vacuum pump and steam jet vacuum pump, combination of soda series jet vacuum pump, jet vacuum pump. Jet vacuum pump in the vacuum range, can direct suction vapor can non-condensable gas and with granular medium, simple structure, convenient operation, no moving parts a little maintenance. Defect is single-stage pump vacuum degree is not high, multi-stage steam loss is big, installation problems, limits its scope of application.

( 4) Steam spray water ring vacuum pump unit the work principle and advantages of

steam injection water ring vacuum pump working principle is through the steam through laval nozzle, decompression rate ( The potential energy into kinetic energy of steam) With supersonic spray into the suction chamber, and is pumped medium mixed, into the energy exchange, after mixing of gas into the diffuser, slow pressurization, in order to reduce the suction pump after load, configuration of the condenser, through convection, have certain temperature difference between two kinds of medium for heat exchange, achieve condensation heat medium, into the atmosphere. Have high vacuum, large displacement, but any gas suction, simple structure, convenient operation, no moving parts maintenance quantity is small, simple installation, widely used in chemical industry in the operation of each process

2, conclusion with the continuous development of commodity economy and energy of outstanding, each enterprise saving energy and reducing consumption, improve production efficiency, improve the quality of the products is more and more become an important means to increase their core competitiveness, in the process of all kinds of choosing appropriate jet vacuum pump, reduce operating costs, will is a strong measure for the enterprise to increase core competitiveness.

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