The hottest Yangzi Petrochemical and BASF styrene

2022-10-14
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Yangzi Petrochemical and BASF styrene circulating cooling system project

Yangzi BASF styrene joint venture plant is a joint venture plant constructed by Yangzi Petrochemical Company and BASF Germany. It consists of 130000 T/a ethylbenzene (EB), 120000 T/a styrene (SM) and 102000 T/a polystyrene (PS) units, as well as corresponding supporting auxiliary production facilities and utility systems. The total investment of the project is about 1.8 billion yuan, which was officially put into operation in October 1997. According to the introduction, the design scale of its circulating water station is 15000m3/h, the circulating cooling water supply temperature t2=33 ℃, the return water temperature t1=43 ℃, and the cooling temperature difference Δ t=10℃。 The circulating cooling water system is open, and the cross flow mechanical ventilation cooling tower of Mary 600 type is designed, with 3 groups and 6 grids in total, and its supporting fan is l85a axial flow fan. Basic elements of circulating cooling water treatment. According to experts, the design of circulating cooling water treatment process is based on the requirements of heat exchange equipment for dirt thermal resistance and corrosion rate, especially for a large number of enterprises such as us, the water quality index of make-up water and the water quality standard of circulating cooling water, and the successful operation experience of existing circulating water stations of Yangzi Petrochemical Company, which is determined through technical and economic comparison. The expert gave a detailed introduction to the design of circulating cooling water treatment of BASF-YPC styrene joint venture plant

① main process: the make-up water of the circulating cooling water system is the industrial water of Yangzi Petrochemical Company. Five circulating water pumps (3 in service and 2 for standby) are pumped into the circulating cooling water supply pipe after being pressurized by the water pool under the cooling tower, which is used to supply the cooling water of the process unit. According to experts, the circulating cooling return water is returned to the circulating water station through the circulating cooling return pipe. After being evenly distributed by the water distribution system of the cooling tower, the air-water heat exchange and cooling are carried out from top to bottom in the cooling tower. After cooling, it enters the pool under the tower, and then is pressurized and supplied by the circulating water pump. So cycle

② dosing process: to control whether the measurement accuracy of cyclic load meets or exceeds the standards of astm4 and iso7500/1 The load sensor should also consider: range, accuracy, repeatability, offset loading fault, nonlinearity, stable compensation range, temperature zero drift and sensitivity The automatic identification, calibration and zeroing of the load sensor greatly speeds up the experimental process and ensures the consistency and accuracy of the data In addition, for the corrosion and scaling of the pipes and heat exchange equipment through which the circulating cooling water flows, corrosion and scale inhibitor must be added to the circulating cooling water. In addition, before the normal operation of the system, according to experts, the prefilming agent must be added first, so that the corresponding export subsidies should be eliminated, and a perfect corrosion inhibition protective film should be formed on the metal surface. The raw liquid of traditional Chinese medicine in this system is sent to the medicine storage tank through self-priming pump or manual handling, and then diluted water (industrial water or circulating cooling water) is added according to a certain proportion, or the raw liquid is directly stirred and flows into the medicine solution tank by itself, and then the liquid is sent to the lower pool of the cooling tower by two metering pumps (one for use and one for standby)

③ chlorination process: in order to control the reproduction of microorganisms such as bacteria and algae, biocides must be added to the circulating cooling water. In this system, the biocide selected in the design is liquid chlorine. Chlorine evaporates from the chlorine bottle, passes through the chlorine filter, vacuum regulator and chlorination control cabinet, and finally is sent to the water pool under the cooling tower through the water ejector. According to experts, the system also includes a residual chlorine analyzer, which controls residual chlorine 0.5 ~ 1.0mg/l. At the same time, the residual chlorine analyzer is interlocked with the chlorinator to realize continuous automatic chlorination. Two sets of chlorination systems are designed, one for use and one for standby, which can be switched automatically or manually

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