CN204552846U - A kind of back pressure steam turbines utilization system - Google Patents

Abstract

The utility model provides a comprehensive utilization system of a back pressure steam turbine unit, comprising: a steam turbine power generation system, a heat load (5) and an ORC power generation system (4); the heat load 5 is connected in parallel with an ORC power generation system 4; The opening state of the valve 13, the second regulating valve 14 and the third regulating valve 12 can realize the adjustment of the exhaust steam used for heating and the exhaust steam used for ORC power generation under the condition that the total steam production of the boiler remains unchanged The amount, and then change the heat supply and ORC power generation to adapt to the fluctuation of heat load, achieve the advantages of improving equipment utilization, and meet the demand for heat and electricity at the same time.

Description

A Comprehensive Utilization System of Back Pressure Steam Turbine Unit

technical field

The utility model belongs to the technical field of industrial energy saving, and in particular relates to a comprehensive utilization system of a back pressure steam turbine unit.

Background technique

The exhaust steam of the back pressure steam turbine unit can be used for heat supply, including: boiler, steam turbine and heat load; among them, the high-temperature steam port of the boiler is connected with the steam inlet of the steam turbine through the steam guide pipe, and the high-temperature steam is delivered to the steam turbine through the boiler; The steam outlet of the steam turbine is connected to the heat load for providing heat energy to the heat load.

However, the back pressure steam turbine unit is a combined heat and power system, and the electric power generated by it is determined by the heat load, that is, the power is determined by heat, that is to say, the power generation of the back pressure steam turbine unit is restricted by the heat load. In summer, The heat load is low, so it is necessary to adjust the total steam output of the boiler to reduce the total steam output of the boiler so as to adapt to the heat load. However, while reducing the total steam output, the steam intake of the steam turbine decreases , which directly leads to a reduction in the power generation of the steam turbine; in severe cases, if the thermal load is too low, it will directly cause the turbine to stop operating. In winter, the heat load fluctuates dynamically. Therefore, it is necessary to frequently adjust the total steam production of the boiler so that the total steam production of the boiler can adapt to the heat load. Therefore, on the one hand, it increases the workload and increases the use of On the other hand, when the heat load decreases, the total steam production of the boiler needs to be lowered, and when the total steam production of the boiler becomes smaller, it will directly lead to a decrease in the power generation of the steam turbine, resulting in a decrease in equipment utilization.

It can be seen that the production and operation of the traditional back pressure steam turbine unit cannot adapt well to the fluctuation of heat load, resulting in a decrease in equipment utilization.

Utility model content

Aiming at the defects existing in the prior art, the utility model provides a comprehensive utilization system of a back pressure steam turbine unit, which can effectively solve the above problems.

The technical scheme that the utility model adopts is as follows:

The utility model provides a comprehensive utilization system of a back pressure steam turbine unit, comprising: a steam turbine power generation system, a heat load (5) and an ORC power generation system (4);

Wherein, the steam turbine power generation system includes: a boiler (1), a steam turbine (2), a first heater (6), a deaerator (7), a condensate pump (8) and a second heater (9);

The steam outlet of the boiler (1) is connected to the steam inlet of the steam turbine (2) through the first steam pipeline; the steam extraction port of the steam turbine (2) is connected to the second heating port through the steam extraction pipeline. The steam inlet of the device (9); the steam exhaust pipeline of the steam turbine (2) is divided into two branches, which are respectively the first steam exhaust branch and the second exhaust steam branch; the first exhaust steam branch connected to the steam inlet of the heat load (5); the second exhaust branch is connected to the steam inlet of the ORC power generation system (4); wherein, the first exhaust branch is equipped with a first 1 regulating valve (13); the second exhaust branch is equipped with a second regulating valve (14);

The drain of the heat load (5) and the drain of the ORC power generation system (4) are all connected to the first water inlet of the deaerator (7) through a drain pipe; the deaerator (7) The water outlet of the condensate pump (8) is connected to the water inlet of the second heater (9); the water outlet of the second heater (9) is connected to the water inlet of the boiler (1).

Preferably, it also includes: a decompression and desuperheater (3); the steam outlet of the boiler (1) is directly connected to the steam inlet of the heat load (5) through the second steam pipeline; 2 The steam pipeline is equipped with a 3rd regulating valve (12).

Preferably, the first heater (6) is a shaft seal heater.

Preferably, the first heater (6) is also in communication with the chemical makeup water pipeline (11).

Preferably, it also includes: a continuous blowdown expansion vessel (10); the water inlet of the continuous blowdown expansion vessel (10) communicates with the blowdown outlet of the boiler (1).

The comprehensive utilization system of the back pressure steam turbine unit provided by the utility model has the following advantages: the heat load 5 is connected in parallel with the ORC power generation system 4; Under the condition that the quantity remains unchanged, the heat supply and ORC power generation can be changed to adapt to the fluctuation of the heat load, which has the advantage of strong adaptability to the heat load, thereby improving the utilization rate of the equipment and meeting the demand for heat and electricity at the same time.

Description of drawings

Fig. 1 is a structural schematic diagram of the comprehensive utilization system of the back pressure steam turbine unit provided by the utility model.

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing:

With reference to Fig. 1, the utility model provides a comprehensive utilization system of a back pressure steam turbine unit, including: a steam turbine power generation system, a heat load 5 and an ORC power generation system 4; wherein the heat load 5 can be a heat exchanger;

The steam turbine power generation system includes: a boiler 1, a steam turbine 2, a first heater 6, a deaerator 7, a condensate pump 8 and a second heater 9; in practical applications, the first heater 6 can be a shaft seal heater; The chemical supplementary water pipeline 11 is connected; the second heater 9 can be a high-pressure heater;

The steam outlet of boiler 1 is connected to the steam inlet of steam turbine 2 through the first steam transmission pipe; the steam extraction port of steam turbine 2 is connected to the steam inlet of second heater 9 through the steam extraction pipe; the exhaust pipe of steam turbine 2 is divided into There are two branches, respectively the first exhaust branch and the second exhaust branch; the first exhaust branch is connected to the steam inlet of the heat load 5; the second exhaust branch is connected to the ORC power generation system 4 The steam inlet; wherein, the first exhaust branch is equipped with a first regulating valve 13; the second exhaust branch is equipped with a second regulating valve 14;

The drain of the heat load 5 and the drain of the ORC power generation system 4 are connected to the first water inlet of the deaerator 7 through the drain pipe; the water outlet of the deaerator 7 is connected to the inlet of the second heater 9 through the condensate pump 8 The water port; the water outlet of the second heater 9 is connected to the water inlet of the boiler 1.

It also includes: a decompression desuperheater 3; the steam outlet of the boiler 1 is directly connected to the steam inlet of the heat load 5 through the second steam pipeline; a third regulating valve 12 is installed on the second steam pipeline.

It also includes: a continuous sewage discharge expansion vessel 10; the water inlet of the continuous sewage discharge expansion vessel 10 communicates with the sewage discharge port of the boiler 1.

The working principle of the comprehensive utilization system of the back pressure steam turbine unit provided by the utility model is as follows:

When the system is running normally, the boiler 1 generates high-pressure steam, which enters the back-pressure steam turbine 2 to generate electricity; in addition, the high-pressure steam is also connected to the heat load 5 through the pipeline installed with the desuperheater 3, and the pipeline is installed with 3rd regulator valve 12. Wherein, a small part of the extracted steam of the steam turbine 2 enters the second heater 9 for preheating the condensed water. The exhaust steam of the steam turbine 2 is divided into two parts, one part is sent to the heat load 5 for heat supply; the other part is sent to the ORC power generation system 4 for power generation. After the steam is used for heat supply and ORC power generation, it is condensed into condensed water and sent to the deaerator 7 . In addition, the chemical make-up water 11 is also sent to the deaerator 7 after being preheated by the shaft seal heater. The liquid water in the deaerator 7 is driven by the condensate pump 8, preheated by the second heater 9, and then sent to the boiler 1, thereby completing the system cycle.

In the utility model, the heat load 5 is connected in parallel with the ORC power generation system 4; by flexibly adjusting the opening states of the first regulating valve 13, the second regulating valve 14 and the third regulating valve 12, the total steam production of the boiler can be kept constant Under the circumstances, adjust the exhaust steam used for heating and the exhaust steam used for ORC power generation, and then change the heat supply and ORC power generation to adapt to the fluctuation of heat load and achieve the advantage of improving equipment utilization.

Specifically, under the condition that the total steam production of the boiler remains unchanged, in winter, due to the high heat load, the first regulating valve 13 is increased to increase the exhaust steam sent to the heat load 5 to meet the heat load requirement. load demand; at the same time, turn down the second regulating valve 14 to reduce the amount of exhaust steam sent to the ORC power generation system 4 . As a result, the heat supply is increased and the ORC power generation is reduced to meet the demand for increased heat load. Moreover, since the steam intake of the steam turbine 2 does not change, the power generation of the steam turbine remains unchanged.

In extreme conditions in winter, if the second regulating valve 14 is closed, the ORC power generation system 4 is shut down, and then the first regulating valve 13 is fully opened, so that all the exhaust steam of the steam turbine 2 is used for heating. If the heating demand cannot be met, the third regulating valve 12 needs to be opened to allow part of the high-pressure steam to pass through the desuperheater, mix with the exhaust steam from the steam turbine 2, and send it to the heat load 5 to meet the heating demand. At this time, the heat supply increases, and the ORC power generation system 4 stops operating. Since the steam intake of the steam turbine decreases, the power generation of the steam turbine decreases.

In summer, or when the heating load is small, adjust the first regulating valve 13 to reduce the amount of exhaust steam sent to the heat load 5; Exhaust steam increases. At this time, the total steam production of the boiler 1 remains unchanged, the power generation of the steam turbine remains unchanged, the heat supply decreases, and the power generation of the ORC power generation system 4 increases, which solves the problem in the prior art when the heat supply decreases. As a result, the power generation of the steam turbine is reduced, resulting in a problem that the utilization rate of the equipment is reduced.

It can be seen that in the utility model, the heat load 5 is connected in parallel with the ORC power generation system 4; by flexibly adjusting the steam intake of the heat load 5 and the ORC power generation system 4, it can be realized that the total steam output of the boiler remains unchanged, and the The heat supply and ORC power generation can adapt to the fluctuation of heat load, which has the advantage of strong adaptability to heat load, so as to improve the utilization rate of equipment and meet the demand of heat and electricity at the same time.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be considered within the protection scope of the present utility model.

Claims (5)

1. A back pressure type steam turbine unit comprehensive utilization system is characterized in that, comprising: steam turbine power generation system, heat load (5) and ORC power generation system (4); Wherein, the steam turbine power generation system includes: a boiler (1), a steam turbine (2), a first heater (6), a deaerator (7), a condensate pump (8) and a second heater (9); The steam outlet of the boiler (1) is connected to the steam inlet of the steam turbine (2) through the first steam pipeline; the steam extraction port of the steam turbine (2) is connected to the second heating port through the steam extraction pipeline. The steam inlet of the device (9); the steam exhaust pipeline of the steam turbine (2) is divided into two branches, which are respectively the first steam exhaust branch and the second exhaust steam branch; the first exhaust steam branch connected to the steam inlet of the heat load (5); the second exhaust branch is connected to the steam inlet of the ORC power generation system (4); wherein, the first exhaust branch is equipped with a first 1 regulating valve (13); the second exhaust branch is equipped with a second regulating valve (14); The drain of the heat load (5) and the drain of the ORC power generation system (4) are all connected to the first water inlet of the deaerator (7) through a drain pipe; the deaerator (7) The water outlet of the condensate pump (8) is connected to the water inlet of the second heater (9); the water outlet of the second heater (9) is connected to the water inlet of the boiler (1). 2. The comprehensive utilization system of back-pressure steam turbine unit according to claim 1, further comprising: a decompression desuperheater (3); the steam outlet of the boiler (1) passes through the second steam pipeline It is directly connected to the steam inlet of the heat load (5); a third regulating valve (12) is installed on the second steam pipeline. 3. The comprehensive utilization system of back pressure steam turbine unit according to claim 1, characterized in that the first heater (6) is a shaft seal heater. 4. The comprehensive utilization system of back pressure steam turbine unit according to claim 1, characterized in that, the first heater (6) is also communicated with the chemical makeup water pipeline (11). 5. the comprehensive utilization system of back pressure type steam turbine unit according to claim 1, is characterized in that, also comprises: continuous sewage blowdown expander (10); The water inlet of described continuous blowdown blowdown expander (10) and described boiler ( 1) The sewage outlet is connected.