RU106736U1 - WATER SUPPLY SYSTEM OF HEAT POWER PLANT - Google Patents

Abstract

 1. The water supply system of a thermal power plant, consisting of supply and exhaust channels connected to a water supply source, with a direction of water movement from a water supply source to a supply channel, and from a discharge channel to a water supply source, an onshore pump station with the function of supplying water from the supply channel to the steam condenser turbines, the output of which is connected to the outlet channel, characterized in that the inlet and outlet channels are common with the same channels located closer to the junction of the root a main channel with a water supply source of a neighboring thermal power plant with a straight-through water supply system, between the outlet and inlet channels there is a second pump station with a function of supplying water from the outlet channel to the artificial cooling device, the outlet of which is connected to the inlet channel near the location of the entrance of the first pump station, the connection of the inlet of the second pumping station with the outlet channel is located upstream of the water of the connection with the outlet channel of the condenser outlet steam turbines. ! 2. The water supply system of a thermal power plant according to claim 1, characterized in that the source of water supply is a river, and the artificial cooling device is made in the form of a cooling tower.

Description

The utility model relates to a power system and can be used to ensure the operability of a part of a complex of thermal power plants under conditions of water limitation in a water supply source.

It is known that under conditions of water restriction for water supply to thermal power plants, a reverse water supply system with cooling ponds or with artificial cooling devices, in particular cooling towers, is used. (See Ryzhkin V.Ya. “Thermal Power Plants”, M. Energia, 1987, pp. 293-300, RF Patents No. 2269733, publ. 02.10.2006 and No. 21595919, publ. 10.09.2000) . In such systems, water circulates in a closed circuit, and despite the fact that these systems are most used, they have significant drawbacks. When water evaporates in a closed loop of water circulation “cooling tower - turbine condenser - cooling tower”, the salt content of cooling water increases, as a result of which pollution of the surfaces of heat exchangers is intensified, which leads to a deterioration in the efficiency of heat transfer. In addition, in such systems, the average annual temperature of cooling water is relatively high and, for example, in the Urals and Siberia is 18 ÷ 20 ° C, and this does not allow for a sufficiently deep vacuum and reduces the work of steam in the turbine and, thus, reduces the coefficient of useful actions.

Closest to the proposed utility model and adopted as a prototype is a direct-flow system of water supply to thermal power plants (see A. Kudinov “Thermal Power Plants”, Study Guide, Samara 2005, pp. 136-138), which is free from the indicated disadvantages of the analogue.

The direct-flow water supply system consists of a supply channel connected to a water supply source, from which cooling water is supplied to a turbine condenser by means of a pump, and a discharge channel, where water formed after steam condensation is discharged. Mixing heated water from the condenser with water drawn from the feed channel into the condenser does not occur. The movement of water in the inlet channel is directed from the source of water supply, in the outlet channel, towards the source of water supply. Such sources may be a river, flowing lake or sea.

Direct-flow water supply system is the most economical. The average annual temperature of cooling water from the rivers of the same Urals and Siberia is 6 ÷ 10 ° C, which allows to obtain a higher vacuum in the condenser, as a result of which the work of steam in the turbine increases. In addition, the salinity of cooling water and the contamination of the surfaces of heat exchangers do not increase in this system.

The disadvantage of the prototype, despite the wide distribution, is the complexity of the practical implementation at the present time. It is especially difficult to implement them if it is necessary to supply water to the newly constructed thermal power plants next to the existing ones due to the increase in energy consumption in the region. The reason for the difficulty lies in the lack of water flow in the source of water supply, especially in the summer, while meeting the needs of an increasing number of thermal power plants in an expanded complex. In such cases, it is necessary to implement a circulating water supply system for newly built thermal power plants, putting up with the disadvantages of its operation.

The task to which the proposed utility model is directed is to increase the turbine productivity in conditions of a lack of water flow.

The problem is solved by achieving a technical result in the implementation of this utility model, which consists in increasing the efficiency in combination with lower operating costs and water consumption.

This technical result is achieved by the fact that in the water supply system of a thermal power plant, consisting of supply and outlet channels connected to a water supply source, with a direction of water movement from a water supply source to a supply channel, and from a discharge channel to a water supply source, an onshore pumping station with a water supply function from the inlet channel to the condenser of steam turbines, the outlet of which is connected to the outlet channel, the inlet and outlet channels are common with the same channels of the adjacent heat power plant with a direct-flow water supply system, which is located closer to the junction of the inlet channel with the water supply source. Between the outlet and inlet channels, a second pump station is installed with the function of supplying water from the outlet channel to the artificial cooling device, the outlet of which is connected to the inlet channel near the location of the inlet of the first pump station. At the same time, the junction of the inlet of the second pumping station with the outlet channel is located upstream of the junction with the outlet channel of the condenser output of the steam turbines. The artificial cooling device is made in the form of a cooling tower, and the source of water supply is, for example, a river.

The installation of a cooling tower between the inlet and outlet channels of a direct-flow water supply system of a neighboring thermal power plant with a limited cooling water flow rate provides increased efficiency and reduced operating costs of an expanded complex of thermal power plants, as the proposed use of the cooling tower implements water cooling without increasing salt content and avoids special chemical treatment, such as fluorination, as well as purging and replenishing the system with specially prepared clarified water. The location of the place of water intake into the tower upstream of the water in the outlet channel with respect to the place of discharge of water from the condenser supplied to the proposed thermal power system by this system provides a reduced heat load of the tower.

The essence of the utility model is illustrated by the figure, which shows a block diagram of the proposed system.

It consists of a water supply source, for example, a river, a supply channel 1 with a predominant direction of the flow of water from the river and a discharge channel 2 with the flow of water toward the river. An inlet 3 of a pumping station 4 is connected to the supply channel 1, which is designed to supply water to the condenser of steam turbines 5, the output 6 of which is connected to the discharge channel 2. In a similar way, the neighboring thermal power station (TPP) is connected to channels 1 and 2 with a direct-flow water supply system located closer to the junction of the inlet channel 1 with the river. In the outlet channel 2 upstream from the connection point of the output 6 of the condenser 5 there is an inlet 7 of a second pump station 8 for supplying water to an artificial cooling device, for example a cooling tower 9. The output 10 of the cooling tower 9 is connected to the inlet channel 1 at a location near inlet 3 of the pumping station 4.

The inventive system operates as follows.

The water remaining at the inlet 3 from the inlet channel 1 and the TPP river near the junction of the inlet channel 1 is sucked from the inlet channel 1 by the pumping station 4 into the condenser of steam turbines 5, and then through outlet 6 is discharged into the outlet channel 2 near the junction of this channel with the river. In the same channel 2, water was drained from the first TPP. The proportion of this water, due to the location of the inlet 7 of the pumping station 8, downstream of the outlet channel 2 of the drain from the TPP, but higher than the location of the inlet 6, is pumped by the pumping station 8 at this inlet 7 and enters the cooling tower 9. After cooling in the cooling tower 9 water through outlet 10 is discharged into the supply channel 1 near the location of the inlet 3 of the pump station 4. This water, mixed with a new portion of the water remaining after being drawn into the first TPP, is sucked through the inlet 3 of the pump station 4 and enters the condenser 5, and then through output 6 to the outlet anal 2.

Thus, in conditions of shortage of cooling water, especially in the summer, using the proposed system, water is reused with a minimum increase in operating and energy costs, as well as increased efficiency of the turbines due to improved vacuum in the condensers and lower water temperature at their inlet after cooling in a cooling tower.

Claims (2)

1. The water supply system of a thermal power plant, consisting of supply and exhaust channels connected to a water supply source, with a direction of water movement from a water supply source to a supply channel, and from a discharge channel to a water supply source, an onshore pump station with the function of supplying water from the supply channel to the steam condenser turbines, the output of which is connected to the outlet channel, characterized in that the inlet and outlet channels are common with the same channels located closer to the junction of the root a main channel with a water supply source of a neighboring thermal power plant with a straight-through water supply system, between the outlet and inlet channels there is a second pump station with a function of supplying water from the outlet channel to the artificial cooling device, the outlet of which is connected to the inlet channel near the location of the entrance of the first pump station, the connection of the inlet of the second pumping station with the outlet channel is located upstream of the water of the connection with the outlet channel of the condenser outlet steam turbines. 2. The water supply system of a thermal power plant according to claim 1, characterized in that the source of water supply is a river, and the artificial cooling device is made in the form of a cooling tower.