CN204404310U - Air cooling unit exhaust steam waste heat plural serial stage heating system - Google Patents

Abstract

The utility model discloses a kind of air cooling unit exhaust steam waste heat plural serial stage heating system, solve the problem that the utilization rate of waste heat of existing waste heat for supplying technology existence is low.Comprise first order back pressure thermal power plant unit (1), second level back pressure thermal power plant unit (2), third level back pressure thermal power plant unit (3), fourth stage back pressure thermal power plant unit (4) and peak load calorifier (5), be linked in sequence between thermal power plant unit at different levels and peak load calorifier, heat supply network recirculated water realizes step heating by unit at different levels successively.The beneficial effects of the utility model the heating system of heat supply hot net water are optimized to level Four heating, reduces the thermograde of hot net water in heating process poor, thus decrease the exergy destruction in diabatic process.System is simple, can realize heating parameter flexible modulation by adjustment turbine back pressure parameter.Native system is applicable to Direct Air-Cooling in Thermal Power Plants unit, is particularly suitable for the occasion of multiple stage unit paired running.

Description

Multi-stage series heating system of exhaust steam waste heat of air-cooled unit

technical field

The utility model relates to a multi-stage series heating system which utilizes the gradient of the back pressure of a direct air-cooling unit to heat the circulating water of a heating network step by step, and is a heating system for directly recovering exhausted steam waste heat of the unit.

Background technique

With the continuous advancement of urbanization, the capacity of existing urban heating sources can no longer meet the needs of new urban loads. In recent years, there have been more and more projects using the exhaust steam waste heat of the unit for heating. At present, there are three main technologies for using waste heat for heating: the first is heat pump heating technology, which uses absorption or compression heat pumps to extract exhaust heat from steam turbines and high-quality energy to circulate the heating network under the drive of certain high-quality energy. Water is used for heating, and the ratio of exhaust steam waste heat to total heat supply in a heating season is about 30%-40%. The second is the pre-condenser heat pump heat supply technology, which uses the pre-condenser to directly absorb the exhaust heat of the unit to perform primary heating of the circulating water in the heating network, and uses the heat pump to extract a part of it under the drive of a certain high-quality performance. Combining exhaust steam and waste heat with high-quality energy can carry out secondary heating of the circulating water in the heating network. The ratio of exhaust steam and waste heat to the total heat supply in a heating season is about 45%-55%. The third is the high back pressure heating technology, which increases the back pressure of an air-cooled unit, and directly absorbs the waste steam heat of the unit by setting a large-capacity condenser to heat the circulating water of the heating network. The heat supply accounts for about 55%-65% of the total heat supply. The waste heat heating technologies above all have the problem of low utilization rate of waste heat.

Contents of the invention

The utility model provides a multi-stage series series heat supply system for exhaust steam waste heat of an air-cooling unit, which solves the technical problem of low utilization rate of waste heat existing in the existing waste heat heat supply technology.

The utility model solves the above technical problems through the following technical solutions:

A multi-stage series heat supply system of exhaust steam waste heat of an air-cooling unit, including a first-stage back-pressure heating unit, a second-stage back-pressure heating unit, a third-stage back-pressure heating unit, and a fourth-stage back-pressure heating unit And the peak heater, the exhaust steam port of the first-stage unit condenser is connected with the direct air-cooled exhaust pipeline of the first-stage back-pressure heating unit through the first-stage heating exhaust pipe, and the first-stage unit condensing The exhaust steam condensate port of the boiler is connected with the hot well of the exhaust device of the first-stage back pressure heating unit through the first-stage heat-supply exhaust-steam condensate pipe, and the return water pipe of the urban heating network passes through the first-stage unit condensate The inlet pipe of the condenser is connected with the condenser of the first-stage unit, and the steam turbine of the first unit of the first-stage back-pressure heating unit is connected with the peak heater through the extraction pipe of the first-stage unit, and the peak heater The steam extraction condensate outlet of the first-stage unit is connected with the hot well of the exhaust device of the first-stage back pressure heating unit through the steam extraction condensate pipe of the first-stage unit; the exhaust steam port of the condenser of the second-stage unit Through the second-stage heating exhaust steam pipeline, it is connected with the direct air-cooled exhaust steam pipeline of the second-stage back-pressure heating unit, and the exhaust steam condensate port of the second-stage unit condenser is condensed through the second-stage heating exhaust steam The water pipe is connected with the hot well of the exhaust device of the second-stage back pressure heating unit, and the water outlet of the first-stage unit condenser is condensed with the second-stage unit condenser through the water inlet pipe of the second-stage unit The steam turbine of the second unit of the second-stage back pressure heating unit is connected with the peak heater through the extraction pipe of the second-stage unit, and the condensate outlet of the second-stage unit on the peak heater is passed through the second-stage unit. The steam extraction condensate pipe of the second-stage unit is connected with the hot well of the exhaust device of the second-stage back pressure heating unit; the exhaust steam port of the condenser of the third-stage unit is connected to the third The direct air-cooled exhaust pipes of the first-stage back-pressure heating unit are connected together, and the exhaust steam condensate port of the third-stage unit condenser passes through the third-stage heating exhaust condensate pipe and the third-stage back-pressure heating unit. The hot well of the exhaust device is connected together, the water outlet of the condenser of the second stage unit is connected with the condenser of the third stage unit through the water inlet pipe of the condenser of the third stage unit, and the back pressure heat supply of the third stage The steam turbine of the third unit of the unit is connected with the peak heater through the third-stage unit extraction pipe, and the third-stage unit extraction condensate outlet on the peak heater is connected to the third-stage unit through the third-stage unit extraction condensate pipe. The hot well of the exhaust device of the back pressure heating unit is connected together; the exhaust steam port of the fourth-stage unit condenser passes through the fourth-stage heating exhaust pipe and the direct air-cooled exhaust pipe of the fourth-stage back-pressure heating unit The exhaust steam condensate outlet of the condenser of the fourth-stage unit is connected with the hot well of the exhaust device of the fourth-stage back-pressure heating unit through the fourth-stage heat-supply exhaust-steam condensate pipe, and the third-stage The water outlet of the condenser of the unit is connected with the condenser of the fourth unit through the inlet pipe of the condenser of the fourth unit, and the water outlet of the condenser of the fourth unit is connected with the condenser of the fourth unit The water outlet pipeline communicates with the peak heater, and the city heating network circulating water supply pipeline is connected to the water outlet of the peak heater.

The utility model significantly improves the waste heat utilization rate of the heating unit, and the heat supply ratio of exhaust steam waste heat in a heating season to the total heat supply is about 72-90%. And the heating system is simplified, so that the adaptability of the system to the unit and the flexibility of heating temperature adjustment have been improved.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The present invention is described in detail below in conjunction with accompanying drawing:

A multi-stage series heat supply system for exhaust steam and waste heat of an air-cooled unit, comprising a first-stage back-pressure heating unit 1, a second-stage back-pressure heating unit 2, a third-stage back-pressure heating unit 3, and a fourth-stage back-pressure heating unit. The heating unit 4 and the peak heater 5, the exhaust steam outlet of the first-stage unit condenser 6 passes through the first-stage heating exhaust pipeline 7 and the direct air-cooling exhaust pipeline 8 of the first-stage back-pressure heating unit 1 Connected together, the exhaust steam condensate port of the first-stage unit condenser 6 is communicated with the exhaust device hot well 10 of the first-stage back pressure heating unit 1 through the first-stage heating exhaust steam condensate pipeline 9, The urban heating network return water pipeline 11 communicates with the first-stage unit condenser 6 through the water inlet pipe 12 of the first-stage unit condenser 6, and the first-stage steam turbine 13 of the first-stage back-pressure heating unit 1 passes through The steam extraction pipe 14 of the first stage unit is connected with the peak heater 5, and the steam extraction condensate outlet of the first stage unit on the peak heater 5 is connected to the first stage back pressure supply through the steam extraction condensate pipe 24 of the first stage unit. The hot well 10 of the steam exhaust device of the thermal unit 1 is connected together; the exhaust steam port of the condenser 15 of the second-stage unit passes through the exhaust steam pipe 16 of the second-stage heating supply and the direct air-cooled exhaust of the second-stage back-pressure heating unit 2 The steam pipeline 17 is connected together, and the exhaust steam condensate port of the condenser 15 of the second-stage unit passes through the exhaust steam condensate pipe 18 of the second-stage heating supply and the hot well 10 of the exhaust device of the second-stage back-pressure heating unit 2 Connected together, the water outlet 20 of the condenser 6 of the first-stage unit communicates with the condenser 15 of the second-stage unit through the water inlet pipe 21 of the condenser 15 of the second-stage unit, and the second-stage back pressure heat supply The steam turbine 22 of the second unit of unit 2 is connected with the peak heater 5 through the steam extraction pipeline 23 of the second unit, and the steam extraction condensate outlet of the second unit on the peak heater 5 passes through the steam extraction condensate of the second unit The pipeline 25 communicates with the heat well 19 of the steam exhaust device of the second stage back pressure heating unit 2; The direct air-cooled exhaust pipeline 28 of the pressure heating unit 3 is connected together, and the exhaust steam condensate port of the condenser 26 of the third-stage unit is connected with the third-stage back-pressure heating supply through the third-stage heating exhaust condensate pipeline 29 The hot well 30 of the exhaust device of the unit 3 is connected together, and the water outlet 31 of the condenser 15 of the second-stage unit is communicated with the condenser 26 of the third-stage unit through the water inlet pipe 32 of the condenser 26 of the third-stage unit. Together, the third-stage steam turbine 33 of the third-stage back-pressure heating unit 3 communicates with the peak heater 5 through the third-stage steam extraction pipeline 34, and the third-stage air extraction condensate outlet on the peak heater 5 Through the steam extraction condensate pipe 35 of the third-stage unit, it is connected with the hot well 30 of the steam exhaust device of the third-stage back-pressure heating unit 3; The exhaust steam pipeline 37 is connected with the direct air-cooled exhaust steam pipeline 38 of the fourth-stage back pressure heating unit 4, and the exhaust steam condensate port of the condenser 36 of the fourth-stage unit passes through the fourth-stage heating exhaust steam condensate pipeline 39 is communicated with the exhaust device hot well 39 of the fourth-stage back pressure heating unit 4, and the third-stage unit condenses The water outlet 40 of the condenser 26 communicates with the fourth-stage condenser 36 through the water inlet pipe 41 of the fourth-stage condenser 36, and the water outlet 42 of the fourth-stage condenser 36 passes through the fourth-stage The water outlet pipeline 43 of the unit condenser 36 communicates with the peak heater 5 , and the city heating network circulation water supply pipeline 45 is connected to the water outlet of the peak heater 5 .

The utility model has the beneficial effects of optimizing the heating system of the heating network water to four-stage heating, reducing the temperature gradient difference of the heating network water in the heating process, thereby reducing the exergy loss in the heat transfer process. The system is simple, and the heating parameters can be flexibly adjusted by adjusting the steam turbine back pressure parameters. This system is suitable for direct air-cooling units in thermal power plants, especially for occasions where multiple units operate in parallel.

Claims (1)

1. an air cooling unit exhaust steam waste heat plural serial stage heating system, comprise first order back pressure thermal power plant unit (1), second level back pressure thermal power plant unit (2), third level back pressure thermal power plant unit (3), fourth stage back pressure thermal power plant unit (4) and peak load calorifier (5), it is characterized in that, the exhaust port of first order unit condenser (6) is connected together by the Direct Air-Cooled exhaust line (8) of first order heat supply exhaust steam pipeline (7) with first order back pressure thermal power plant unit (1), the exhaust steam condensation mouth of a river of first order unit condenser (6) is connected together by the steam exhaust device hot well (10) of first order heat supply exhaust steam condensing water conduit (9) with first order back pressure thermal power plant unit (1), municipal heating systems water return pipeline (11) is connected together with first order unit condenser (6) by the inlet channel (12) of first order unit condenser (6), first power generator turbine (13) of first order back pressure thermal power plant unit (1) is connected together by first order unit extraction line (14) and peak load calorifier (5), the condensate water outlet of drawing gas of first order unit on peak load calorifier (5) is connected together by the draw gas steam exhaust device hot well (10) of condensing water conduit (24) and first order back pressure thermal power plant unit (1) of first order unit, the exhaust port of second level unit condenser (15) is connected together by the Direct Air-Cooled exhaust line (17) of second level heat supply exhaust steam pipeline (16) with second level back pressure thermal power plant unit (2), the exhaust steam condensation mouth of a river of second level unit condenser (15) is connected together by the steam exhaust device hot well (10) of second level heat supply exhaust steam condensing water conduit (18) with second level back pressure thermal power plant unit (2), the delivery port (20) of first order unit condenser (6) is connected together with second level unit condenser (15) by the inlet channel (21) of second level unit condenser (15), second power generator turbine (22) of second level back pressure thermal power plant unit (2) is connected together by second level unit extraction line (23) and peak load calorifier (5), the condensate water outlet of drawing gas of second level unit on peak load calorifier (5) is connected together by the draw gas steam exhaust device hot well (19) of condensing water conduit (25) and second level back pressure thermal power plant unit (2) of second level unit, the exhaust port of third level unit condenser (26) is connected together by the Direct Air-Cooled exhaust line (28) of third level heat supply exhaust steam pipeline (27) with third level back pressure thermal power plant unit (3), the exhaust steam condensation mouth of a river of third level unit condenser (26) is connected together by the steam exhaust device hot well (30) of third level heat supply exhaust steam condensing water conduit (29) with third level back pressure thermal power plant unit (3), the delivery port (31) of second level unit condenser (15) is connected together with third level unit condenser (26) by the inlet channel (32) of third level unit condenser (26), 3rd power generator turbine (33) of third level back pressure thermal power plant unit (3) is connected together by third level unit extraction line (34) and peak load calorifier (5), the condensate water outlet of drawing gas of third level unit on peak load calorifier (5) is connected together by the draw gas steam exhaust device hot well (30) of condensing water conduit (35) and third level back pressure thermal power plant unit (3) of third level unit, the exhaust port of fourth stage unit condenser (36) is connected together by the Direct Air-Cooled exhaust line (38) of fourth stage heat supply exhaust steam pipeline (37) with fourth stage back pressure thermal power plant unit (4), the exhaust steam condensation mouth of a river of fourth stage unit condenser (36) is connected together by the steam exhaust device hot well (39) of fourth stage heat supply exhaust steam condensing water conduit (39) with fourth stage back pressure thermal power plant unit (4), the delivery port (40) of third level unit condenser (26) is connected together with fourth stage unit condenser (36) by the inlet channel (41) of fourth stage unit condenser (36), the delivery port (42) of fourth stage unit condenser (36) is communicated with peak load calorifier (5) by the outlet pipeline (43) of fourth stage unit condenser (36), the delivery port of peak load calorifier (5) is connected with municipal heating systems recirculated water supply channel (45).