SU971825A1 - Apparatus for thermally softening water - Google Patents

Description

(54) INSTALLATION OF WATER TKRMICHNSKAYA EXTENSION

one

The invention relates to the thermal softening of natural and waste waters, the content of calcium sulphate in which is close to saturation, and can be used to soften lime-treated marine and sulphate-containing sewage from industrial enterprises.

The installation of a thermochemical sea water seawater is known, including successively placed po-heater, reagent dispenser, thermo-humidifier, expanders, mechanical and cationic filters and a vapor condensate cooler, the first is connected by steam pipelines and pipelines of treated and tempered water 1.

The main disadvantage of this installation is the considerable consumption of naps for mixing heating of calcified water, since its surface heating is limited by the onset of the formation of sulfate deposits by dropping at a temperature above 60-70 ° C.

The closest to the supplyable and technical essence and achievable result is a multi-accessory installation of thermal reduction of neutralized wash water of sulphate pickling, including several sequentially connected levels of thermal humidifier, expanders, pumps for pumping water from one thermal thermal amplifier to another, connected piping pipes to another, connected pipes. and um of the rich water, steam lines, condensate lines and sludge line ha 2.

The disadvantage of this installation is the considerable consumption of steam for the mixing heating of water in the last stage of the thermocouple. The condensate of this vapor is lost.

In addition, mixing the heating of the 1-time water with steam from 60-70 ° C to the temperature of the thermal softener leads to its dilution with condensate, which increases the total amount of the softened water and reduces the effect of the thermal softening. With the evaporation of dried water in calcium sulphate concentrator expanders, it increases, which further reduces the effect of softening. In order to supply water from one stage, a thermocouple to another is necessary before each stage. The chain of the invention is a reduction in ras; heat stroke is smarter than PE, elimination of losses of condensate of heating steam, increase in the degree of water softening and reduce the number of pumping pumps. The goal is achieved by the fact that the installation, which includes successively connected steps of thermal muffler and coezyiHCHHbie pumps with source and groundwater pipelines, steam lines, condensate lines and sludge channels, is equipped with heat exchange devices of the first type installed. In the pipeline of softened water in front of the steps there is a turmo humidifier, the latter of which is connected to steam and condensate lines, the rest is connected to the pipeline of softened water, and the source water pipeline is connected to the pipeline of softened water and the slurry pipe of the last stage of thermal muffler. On the drawing .. a diagram of the installation of thermal water reduction is presented. The installation consists of water supply 1-5 and steam water 6 heat exchangers, a thermo-magnet plug 7-10, a pump 11, a source water pipeline 12, a pipe of thermal flux 13 and 14, a steam line 15, a condensate line 16 and a slag oil separator 17 and 18. in a way. Ieho. The earthen water is heated in the heat exchanger 1 prior to the start of scale formation and displacing the south with part of the softened water supplied through conduit 14 and sh.fam from the pipe 17. The mixture is pumped through the heat exchanger 2 by pump 11 to and pass through a layer of calcium sulfate anhydrite in the first stage of thermoum chit 7. Heated water along with precipitate is heated again in heat transfer} to geek 3 until saturates in niohydrate, passed through a layer of anhydrite in step 8, etc. In the heat exchanger 6, water is heated with steam supplied through the steam line 15, d, about 1 asymptomatic acid, is passed through the ashidrite layer in step 10, 01 sediment is separated and cooled in heat exchangers 5-1 and sent through the cable. Excess amount of upgrade is removed in the form of the largest crystals from each step; about 1..1.1. To pipelines 18., 1 the temperature of water in the first stage is selected because the PGI is more than The low temperature of crystallisation (an-perdrita) proceeds extremely slowly, and at a higher temperature the consumption of softened water on the rammer bailout increases dramatically: oHghepech of the heat exchanger 2 operating at a low temperature 2. As a result, the solubility of olu hydrate is chosen, because the results m ogochiseiLHbix studies and operating experience eploobmennikov in similar conditions pokayvayut that at a temperature above 100 ° C Ulfat calcium crystallizes on the surface only when it kondentratsii exceeds the solubility semi-aquatic modifications in the physicochemical conditions of data. The calipers of the slurry from the last stage of the thermal muffler in the first place ensures a constant replenishment of the contact layer in all the steps of the thermal muffler with the smallest anhydrite crystals, possessing {and the largest specific surface area. These crystals, moving with water through all the steps of the thermocouple, increase the effect of its mind. Gradually, they become larger, settle in one of the intermediate stages of the thermal muffler and are removed during purging. At the same time, the process of mechanical destruction of calcium sulfate anhydrite crystals proceeds with the formation of small embryos that are being carried away by softening water from the material layer. PRI me R. Neutral: Isolate wash water of sulphate after clarification has the following composition, g / kg: calcium 0.57; sodium 0.092; sulphates 1,368; chlorides 0.142, o6ujee salt content 2.172. The water temperature is 10 ° C, the amount of 80 m / h. Water is heated to 70 ° C, mixed with 54.2 m / h of mild water, heated to 112 ° C, passed through an anhydrite layer, reduced calcium content to 0.28 g / kg, heated to 125 ° C, passed through anhydrite layer , reduce the calcium content to 0.174 g / kg, heat to 145 ° C, pass through the anhydrite layer, reduce the calcium content to 0.096 g / kg, heat to 159 ° C due to the heat of softened water, and then to 170 ° C due to heat of steam, and passed through an anhydrite layer, separated from the precipitate and get 134.2 mind water of the following composition, g / kg: calcium 0.05; sodium 0.092; sulfates 0.12; chlorides 0.142; total salt content 0,404. The water is cooled to 88 ° C; 54.2 are mixed with preheated feed water, and 80 m / h are cooled to 28 ° C and sent for washing products after pickling with sulfuric acid. In the proposed method, in comparison with the prototype, the heat consumption is reduced by 1.6 times, the softening effect increases by 1.14 times, the loss of condensate is eliminated, and instead of four transfer pumps

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only one is established. The operation of the thermal installation is simplified, since the sediment is separated only in the last stage.

Claims (2)

1. USSR author's certificate No. 592758, cl. C 02 B 1/22, 1976. 2. Simonov P.P., Shchishchenko V.V. The use of thermal softening devices for desalted neutralized wash water of sulphate etching. -In Sat. Purification of water and recoverable basins at ferrous metallurgy enterprises. Moscow, Metallurgists 1976, No. 5, p. 138-143.