RU1787241C - Method of preparing make-up water for open loop heat supply system - Google Patents

Abstract

SUMMARY OF THE INVENTION: Make-up water after vacuum deaeration is heated to 100 ° C. Then, one part of the heated water is used as a heating agent for vacuum deaeration. The other part is first used as a heating agent for heating the feed water, before it is softened and deaerated, then cooled to 60-70 ° C is sent to the heat supply system. 1 ill.

Description

The invention relates to the field of heat supply and can be used in heat supply systems with open water extraction for hot water supply.

Known analogues are the methods of preparation of make-up water, according to which anticorrosion treatment of water is carried out by deaeration in atmospheric pressure deaerators (see book G. G. G. and other heat-generating plants. M: Stroyizdat, 1986, Fig. 8.11 and description on p. 352). Deaeration of water at atmospheric pressure also makes it possible to ensure environmental characteristics of water quality due to its thermal disinfection when heated in deaerators to a temperature of 100 ° C or higher.

A disadvantage of the analogs is reduced efficiency due to the loss of condensate of the heating steam of deaerators in the heat supply system and the high cost of making up for these losses in the steam cycle of a steam boiler or thermal power plant. In addition, for effective atmospheric deaeration, heating of the source nondeaerated water in front of the deaerators to 70-90 ° C is required, which significantly reduces the reliability of the method due to intense corrosion of the source water heaters.

In the prototype method, in order to increase the reliability and economy, the anti-corrosion treatment of the make-up water is carried out by vacuum deaeration. Reliability in this case is enhanced by lowering the temperature of the source water before vacuum deaeration to 35-40 ° C and the corresponding reduction in the corrosion rate of the source water preheaters. The cost-effectiveness of the method when applying vacuum deaeration is enhanced by the use as a heating agent for vacuum deaeration

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network water, usually from the supply line of the heating network, which eliminates the loss of heating steam in the deaerators of the heating system recharge.

The disadvantage of the prototype method is the inability to provide, for most of the year, the required corrosion and environmental characteristics of the quality of the makeup and network water of the open heating supply system. In the warm season, when the temperature of the supply water in the supply line is less than 100 ° C, the environmental characteristics of the quality of this water deteriorate, since it does not undergo thermal disinfection, which is especially necessary when using feed water that has not undergone antimicrobial chemical treatment at a water intake from a natural reservoir (water temperature after vacuum deaeration is only 50-70 ° C). On the other hand, when the temperature of the supply water in the supply line decreases below 100 ° C, the efficiency of its use as a heating agent in vacuum deaerators decreases. The deterioration of deaeration in the prototype method also leads to the instability of the heating of the source water before softening and vacuum deaeration in the turbine condensers. In winter time, with a decrease in the passage of steam into the condensers of cogeneration turbines, the heating of the source water is only 10-20 ° C. which is insufficient for effective anticorrosion treatment of makeup water in vacuum deaerators.

The aim of the invention is to improve the anti-corrosion and environmental characteristics of the make-up water quality of an open heat supply system.

The goal is achieved in that the make-up water after vacuum deaeration is heated to 100 ° C, part of the heated make-up water is used as a heating agent for the vacuum deaeration, and the rest of the make-up water is heated to the initial water before it is softened and vacuum deaerated, after which it is cooled to At 60-70 ° C, make-up water is sent to the heat supply system.

The drawing shows a schematic diagram of a heat supply plant, on a sleeping method.

The installation contains cogeneration turbines 1 and 2 with condensers 3 and 4 and built-in network heaters 5 and 6 connected to the heating steam extraction, supplying 7 and return 8 network pipelines, source water pipelines 9, deaerated make-up water

10, a heating agent 11, a water-water heat exchanger 21, a unit 13 to reduce or reduce alkalinity, a decarbonizer 14, a vacuum deaerator 15, a storage water tank 16, a make-up pump 17.

A specific example of the implementation of the method. The source water is heated in the condenser 3 of the turbine 1 to 15-20 ° C and in the water-heat exchanger 12 to 45-50 ° C, softened (or reduced alkalinity) in the node 13, decarbonized in the decarbonizer 14, deaerated in a vacuum deaerator 15, deaerated make-up water with a temperature of 70 ° C is supplied to the built-in network heaters 5 of the turbine 1 specially allocated for this purpose, where they are heated to 100 ° C by steam of heating taps. A portion of the heated make-up water (for the temperature regime under consideration is 40% of the flow passing through the heaters 5) is fed through a pipe 11 as a heating agent to the vacuum deaerator 15. The remaining make-up water in the heat exchanger 12 heats the feed water before it is softened and vacuum deaeration, after which the water cooled to 60-70 ° C (i.e., to the temperature of the water for hot water supply) is sent to the storage tank 16 and then by the feed pump 17 to the return network pipe 8. The return network water is heated according to the principle This temperature graph of the heating system depending on the outdoor temperature in the network heaters 6 of the turbine 2, after which they are sent to consumers through pipeline 7.

The significance of the distinguishing features of the claimed method is due to the new order and mode of technological operations for the preparation of makeup water. Heating the make-up water after vacuum deaeration to 100 ° C improves the anti-corrosion and environmental characteristics of the make-up water quality by thermally disinfecting it and maintaining a stable and sufficient temperature of the heating agent for vacuum deaeration. Stable and sufficient heating of the feed water of the feed water before softening and vacuum deaeration also improves the anti-corrosion treatment of feed water in decarbonizers and vacuum deaerators. It is significant that the proposed method has increased reliability due to the implementation of the main heating of the make-up water to 100 ° C after vacuum deaeration, which allows to reduce

intensity of internal corrosion of make-up water heaters.

Claims (1)

SUMMARY OF THE INVENTION A method for preparing make-up water for an open heat supply system by heating it, softening and vacuum deaerating, characterized in that, with the aim of adding water after vacuum 0 deaerations are heated to 100 ° C, then one part of the heated make-up water is used as a heating agent for vacuum deaeration, and the other part is first used as a heating agent to heat the starting make-up water before it is softened and vacuum deaerated, and then cooled to 60- 70 ° C is sent to the heat supply system.