Pumps used in petrochemical plants can be divided into the following categories according to their use: 1. Feed pump Not only does the petrochemical plant feed the feedstock to the distillation column, but it can sometimes be pressured and sent to the reactor, sometimes after the first furnace, and sometimes after the first furnace. High, may be as high as 380.C, or even higher.For example, thermal cracking raw material pump is an example, the petrochemical plant production is continuous, and some devices require one or two years without major repair, so the requirements of such pumps is highly reliable The United States APl610 provisions of the refinery pump to continuous operation of 25,000 h without major repair.This type of pump flow generally have a little margin to accommodate changes in the amount of raw materials.But this time also requires the head to fluctuate as small as possible In most cases, it is required that the net positive suction head be negative, that is, the infusion pump, the elevation of the feed tank should be higher than the suction port of the pump, especially the high temperature feed pump. 2. Circulation pump As the petrochemical process reaction, absorption, separation and other operations need to be carried out at the same time, the absorption of liquid regeneration also sent back to the device for reduction, a variety of reaction system catalyst recycling, extraction process of solvent recycling, heavy oil direct desulfurization process heat Oil circulation, caustic washing and regeneration tower between the cycle, the cooling process of coolant recirculation and so require the use of circulating pump, the pressure drop of such pump cycle is generally not volatile, and the flow is a little certain fluctuations.Operation pump, Multi-run under rated conditions. The key is to choose the right pump for the media material. 3 return pump This pump is used to control the heat balance oil refining distillation column using the pump, such as the top of the reflux, a side of the return line, often with the reboiler with the tower top or section to obtain heat, the entire tower up and down to get thermal equilibrium. Degassing in a distillation or desorption tower requires a return of the stream before the unit is fully decommissioned. The requirement for this type of pump is that the characteristic curve must be flat, especially with no hump performance curve. Bottom or reboiler pump In the bottom of the tower in order to maintain the heat, the pump is usually used to circulate the liquid between the bottom of the tower and the heat source.Most of the liquid is a large flow and at high temperature, saturated state.The main problems are: (1) high temperature pump seals, bearings, body Heat should be good; (2) Normal suction should be ensured under high temperature conditions, no cavitation will occur, and the net positive suction pressure head required by the pump should be kept as small as possible when pumping the pump. Aspiration piping should minimize losses and leave enough allowance. 5 finished pump Most of the liquid is transported under normal temperature and pressure conditions, sometimes the top of the tower or side draw liquid directly to the product tank. The main problem is to maintain product purity, for this reason sometimes use shielded pump. 6. Metering pump Used to inject chemical solvents, antiseptic drugs, etc., require more accurate delivery.Generally used reciprocating metering pump or gear pump or screw pump.At the same time with the injection amount adjustment device. 7. Asphalt paraffin wax pump Due to its high viscosity and wax content, reciprocating steam pumps are often used, although positive displacement pumps are used, or positive displacement pumps are used to prevent automatic sticking in the event of high viscosity waxes. 8. Slurry pump Such as the transmission of catalyst slurry pump, which contains both solid particles at high temperatures, is a poor working conditions of special impurities pump. 9. Light hydrocarbon pump In light of the volatility of light hydrocarbons, they work at high pressures and temperatures, and when frosted they can create hoar frost. One of the keys to this type of pump is the sealing problem. In addition, it is extremely important that such pumps prevent cavitation, at least with minimal sacrifice of efficiency and safety Run.This type of pump to use more cylindrical multi-stage centrifugal pump, shaped like a submerged pump population buried in the ground to prevent cavitation. For petrochemical pumps, a higher or highest level of pump is required, as all of the feed liquid is nearly flammable and most of the temperature and pressure conditions are harsh. The United States has determined based on experience gained from the use and manufacturing sectors A centrifugal pump for the oil industry, oil refinery manufacturing specifications, published by the American Petroleum Institute APl610. The user can use this specification as the basic basis, combined with its own characteristics of the proposed specifications of the specification of the centrifugal pump has been described in detail , Chemical equipment other than oil refining if you need to use an important pump or harsh conditions, but also the appropriate selection according to this specification made of a variety of pumps. More Search Keywords: Pumps Automatic Coal Steam Boiler,10 Kg Pressure Steam Boiler,Coal Steam Boiler,6 Ton Coal Boiler Henan Yuanda Boiler Co., Ltd. , https://www.industrysteamboiler.com
May 23, 2021