SU868011A1 - Recirculation system of technical water supply - Google Patents

Description

(54) TECHNICAL TRAINING SYSTEM

I

The invention relates to recycled water supply systems and can be used mainly in thermal power plants.

The known reverse technical water supply system contains an evaporative cooler with a sprinkler and a pool for water withdrawal, the evaporative cooler being divided into sections, connected sections for the withdrawal of cooled water to sections of the basin connected in series with equalizing jumpers, and heated water supply 1.

The chilled water extraction lines are connected to the common chilled water main, and the heated water supply lines to the common hot water line. Concentration of salts in circulating water due to partial evaporation leads to supersaturation of scale-forming salts in the entire volume of water, which requires stabilization treatment of all circulating water. The high costs of stabilizing agents reduce cost effectiveness. The salt content of the water taken for chemical water treatment and hydro-ash removal is the same. WATER SUPPLY

whereas it is advisable to select water with minimal salt content or reduce the cost of desalting for chemical water treatment, and it is desirable to select water with maximum salt content for hydraulic ash removal to effectively remove salts from the cooling system.

The purpose of the invention is to increase the efficiency of use by reducing the cost of stabilizing water treatment, separate water extraction with minimum and maximum salinity for

10 uses for technological needs.

This goal is achieved by the fact that the cooling circuit is made sectioned according to the number of cooler sections, the make-up pipeline is attached to the first section of the pool of the cooler, and the system supplies the pipeline with the lowest salinity content to the last section of the irrigator and the maximum section salt content.

Podpitytochnaya water to compensate for losses with evaporation, drift entrainment, filtration and sampling for technological needs enters the first section of the evaporative cooler. Water losses in the subsequent sections are compensated for by the flow of water through the balancing bridges from the previous sections. The salt content of water in the sections of the evaporative cooler increases in steps, which makes it possible to reject the stabilization treatment of water in the first sections (or reduce the consumption of reagents for treatment), in which water oversaturation in the scale-forming salts is not achieved. chemical water treatment that allows you to select water with a minimum salt content and, accordingly, reduce the cost of water desalination. The last section is connected to a water extraction pipeline with a maximum salt content, for example, to hydraulic ash removal, which allows efficient removal of salt from the system, by ensuring maximum water content in the last section. The drawing shows the scheme of the proposed circulating system of technical water supply. The circulating water supply system contains an evaporative cooler i (for example, a cooling tower), circulation pumps 2 and cooled heat exchangers 3 (for example, steam turbine condensers). Evaporative cooler 1 consists of pool 4 and irrigator 5. Pool 4 is divided into sections 6 by partitions 7 with equalizing jumpers 8. Each section 6 of pool 4 corresponds to section 9 of irrigator 5. Each section of evaporator is included in a separate circuit 10-12 or 13 of the cooler. Separate cooling circuit includes section 6 of pool 4, line 14 for taking chilled water, circulation pump 2, cooled heat exchanger 3, line 15 for supplying heated water, section 9 sprinkler 5. A feed line 16 is connected to the first section (circuit 10) of the evaporative cooler and line 17 for water treatment of water treatment. To the last section (circuit 13) of the evaporative cooler is connected the water extraction line 18 to the hydraulic ash removal. The device works as follows. In each circuit, water is circulated independently of the other circuits. Part of the water from the circuits is lost as a result of evaporation and drip entrainment in the evaporative cooler 1 and selection for technological needs on lines 17 and 18. Replenishment of water losses in circuits 11 and 12 and 13 is provided by the flow of water through equalization jumpers 8 from previous circuits , respectively, from contours 10-12. Replenishment of water losses In the first circuit 10 is provided by the flow of water through the feed line 16. The salt content in each subsequent circuit contributes stepwise, which is due to the contour being fed with water partially evaporated in the previous circuits. Water treatment is used to remove water with minimum salt brining from primary circuit 10 through line 17. Water from circuit 13 with the highest salinity is fed through line 18 to hydraulic hydraulic removal. The stabilization treatment is subjected to water in the circuits, where supersaturation on scale-forming salts is achieved. Example. An evaporative cooler (cooling tower tower) divided into 4 sections having the same capacity is included in the circulating water technical system of a thermal power plant. Each section is connected to an independent circuit, including circulation pumps and cooled heat exchangers (turbine condensers). The connection between the water circuits is carried out by means of equalization jumpers connecting successively the sections of the cooling tower basin. The first section has a feed line and water extraction lines for chemical water treatment. The last section is connected - water extraction line for hydraulic removal. The total flow rate of circulating water in the cooling system is 3200. Water losses with droplet entrainment and evaporation, respectively, 100 and 400. The selection of water for water treatment and hydro-ash respectively 400 and 100. The total feed is 1000 mz / h. Water was used to feed it, having a salt content of 300 mEq / kg and a carbonate hardness of 2.0 mg mEq / kg. To prevent scale generation, the circulating water is treated with sulfuric acid at the rate of maintaining carbonate hardness of 2.5-meq / kg. The main indicators of the operating mode of the circulating system according to the proposed scheme and known are tabulated. As can be seen from the table, the use of the proposed circulating system of technical water supply in this example reduces the consumption of sulfuric acid by 1.5 times, reduces the salt content of the water supplied to the chemical water treatment by 1.5 times and more effectively removes salts with water for hydraulic ash removal 2.13 times. Thus, the proposed reverse technical water supply system allows reducing the costs of stabilizing treatment of cooling water, reducing the cost of operating a chemical desalting plant by ensuring water extraction with minimal salt content, more efficiently removing salts with water for hydraulic ash removal by providing higher concentration of salt in one from the selected cooling circuits. This prevents self-regulation of the flow of water between the cooling circuits.

Circulation water consumption

Feed, m / h

Selection for chemical water cleaning,

Selection for hydraulic ash removal, M, V4 Evaporation,

Droplet entrainment

Salinity of circulating water, mg / kg

Dosage of sulfuric acid, kg / day

Claims (1)

Relative Sulfuric Acid Consumption Relative Salt- Water Content Used for Chemical Water Treatment - Relative Salinity of Water Wasted for Hydraulic Waste Removal. Recharge from the previous circuit. water, combined in the cooling circuit, and make-up pipeline, characterized in that, in order to increase Economical use by reducing the cost of stabilizing water treatment, the cooling circuit is made partitioned according to the number of cooling sections8000 320003200О 80008000 75 1000 2251,000 350 400 40О 100 100 100 400 400 100 100 00 100 100 25 25 5 333: 500: 1065 1065 592 23 780 522 216 118 88 0.67 0.67 2.13 bodies, the make-up pipeline is attached to the first section of the chiller basin, and the system is provided with a water withdrawal pipeline with the lowest salt content communicated with the first section of the irrigator and a water withdrawal pipeline with the maximum salt content reported from the last section of the irrigator. Sources of information taken into account during the examination 1. Girshfeld V. Ya. Morozov G. N. Thermal power plants. M., Energie, 1973, p. 199. 12 .// .70