CN111734505A - Supercritical high-back-pressure steam turbine heat supply system and heat supply method - Google Patents
Supercritical high-back-pressure steam turbine heat supply system and heat supply method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
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Abstract
The invention relates to a supercritical high-back-pressure steam turbine heat supply system which comprises a high-back-pressure steam turbine, a main steam pipeline, a steam inlet pipeline, a bypass pipeline, a steam exhaust pipeline, a steam extraction heat supply pipeline, a main heat supply pipeline and a controller. The main steam pipeline is connected with the steam inlet pipeline and the bypass pipeline through a tee joint, the steam exhaust pipeline is connected with the main heat supply pipeline after being converged with the bypass pipeline, and the steam extraction heat supply pipeline is converged into the main heat supply pipeline through the tee joint. The steam exhaust generated after the high back pressure steam turbine applies work step by step to generate electricity is used for industrial heat supply, the bypass pipeline connected in parallel guarantees the change of heat supply load, and the steam extraction heat supply pipeline is used as standby heat supply load, so that the stability and the reliability of heat supply are guaranteed. The invention meets the increasing heat demand and heat supply stability requirements of industrial heat users, reduces the plant power consumption, reduces the waste of high-grade energy, improves the effects of energy conservation and emission reduction, and solves the problem that the safe and stable operation of the main steam turbine set is influenced by a large amount of steam extraction and heat supply.
Description
Technical Field
The invention relates to the technical field of power stations, in particular to a heating system and a heating method of a supercritical high-back-pressure steam turbine.
Background
Along with the continuous development of economy of China in recent years, the environmental problems are more and more severe, meanwhile, the energy conservation and emission reduction pressure of thermal power enterprises is more and more high, and the heat supply stability and steam quality requirements of thermal users are also improved continuously, so that the improvement on a steam extraction heat supply system of a supercritical main group or a system for performing heat supply after simple temperature and pressure reduction of supercritical main steam is particularly important.
Because the heat supply system of the prior supercritical main unit mainly performs post heat supply by steam extraction in the main unit, but in actual operation, a large amount of steam extraction and heat supply can influence the operation of a high-pressure heater of the unit and the water temperature at an outlet of the high-pressure heater, thereby influencing the safe and stable operation of the main unit, and the steam supply quantity can hardly meet the heat demand of industrial heat users; if industrial heat supply is carried out after the supercritical main steam is directly subjected to temperature reduction and pressure reduction, not only can high-grade energy be wasted, but also the plant power consumption of thermal power enterprises can be kept high, and the purposes of energy conservation and emission reduction can not be achieved.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a heating system and a heating method for a supercritical high back pressure steam turbine, which solves the technical problems of low heat supply stability, low utilization rate of high-grade energy, and influence of heat supply on the safe and stable operation of a main steam turbine set.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a supercritical high back pressure steam turbine heating system, comprising: the system comprises a high-back-pressure steam turbine, a main steam pipeline, a steam inlet pipeline, a bypass pipeline, a steam exhaust pipeline, a steam extraction heat supply pipeline, a main heat supply pipeline and a controller;
an inlet of the steam inlet pipeline is connected with an outlet of the main steam pipeline, and an outlet of the steam inlet pipeline is connected with a steam inlet of the high back pressure steam turbine;
the inlet of the bypass pipeline is connected with the outlet of the main steam pipeline, and the outlet of the bypass pipeline is connected with the inlet of the main heat supply pipeline;
the inlet of the steam exhaust pipeline is connected with the steam exhaust port of the high-back-pressure steam turbine, and the outlet of the steam exhaust pipeline is connected with the inlet of the main heat supply pipeline;
the inlet of the steam extraction heat supply pipeline is connected with the outlet of a steam extraction port of the steam turbine unit, and the outlet of the steam extraction heat supply pipeline is connected with the inlet of the main heat supply pipeline;
a first adjusting unit, a temperature and pressure reducing unit and a first check valve are sequentially arranged on the bypass pipeline along the steam flow direction, a second adjusting unit is arranged on the steam extraction and heat supply pipeline, a third adjusting unit is arranged on the steam inlet pipeline, and a steam exhaust check valve is arranged on the steam exhaust pipeline;
the first adjusting unit, the temperature and pressure reducing unit and the second adjusting unit are all connected with the controller.
Optionally, the first regulating unit is a first electric regulating valve, an inlet of the first electric regulating valve is connected to an outlet of the main steam pipeline, an outlet of the first electric regulating valve is connected to an inlet of the temperature and pressure reducing unit, and the first electric regulating valve is connected to the controller.
Optionally, the temperature and pressure reducing unit comprises a temperature and pressure reducing valve, a temperature and pressure reducing pipeline and a first electric stop valve;
the temperature and pressure reducing valve comprises a pressure control valve and a temperature reducer, and an inlet of the pressure control valve is connected with an outlet of the first electric regulating valve;
the desuperheater is provided with a subcritical steam inlet, a desuperheating water inlet and a heat supply steam outlet, the outlet of the pressure control valve is connected with the subcritical steam inlet, the heat supply steam outlet is connected with the inlet of the first check valve, the outlet of the desuperheating and depressurizing pipeline is connected with the desuperheating water inlet through the first electric stop valve, and the inlet of the desuperheating and depressurizing pipeline is connected with a condensed water source;
the pressure control valve, the first electric stop valve and the desuperheater are all connected with the controller.
Optionally, the second adjusting unit includes a second electric adjusting valve, a second electric stop valve and a second check valve which are connected in sequence;
an inlet of the second electric regulating valve is connected with an outlet of a steam extraction port of the steam turbine set, and an outlet of the second check valve is connected with an inlet of the main heat supply pipeline;
the second electric regulating valve and the second electric stop valve are connected with the controller.
Optionally, the third regulating unit includes a main steam pressure reducing valve, a main steam valve and a main steam regulating valve which are connected in sequence, an inlet of the pressure reducing valve is connected with an outlet of the main steam pipeline, and an outlet of the main steam regulating valve is connected with a steam inlet of the high back pressure steam turbine.
Optionally, a safety valve is further disposed on the exhaust steam pipeline, and an inlet of the safety valve is connected with an exhaust steam port of the high back pressure steam turbine.
Optionally, a front shaft seal steam extraction pipeline and a rear shaft seal steam extraction pipeline are arranged on the high back pressure steam turbine, the front shaft seal steam extraction pipeline is connected with a front shaft seal of the high back pressure steam turbine, and the rear shaft seal steam extraction pipeline is connected with a rear shaft seal of the high back pressure steam turbine.
Optionally, the rotor of the high back pressure turbine is connected with the generator set through a speed reducer.
Further, the invention also provides a supercritical high back pressure steam turbine heat supply method, which comprises the following steps:
step one, when the high back pressure steam turbine normally operates, steam in a main steam pipeline sequentially enters the high back pressure steam turbine through the main steam pipeline and a steam inlet pipeline and then is input into a main heat supply pipeline through a steam exhaust pipeline, and meanwhile, the steam sequentially enters the main steam pipeline and a bypass pipeline and then is input into the main heat supply pipeline;
step two, when the high back pressure steam turbine stops, steam in the main steam pipeline is input into the main heat supply pipeline through the bypass pipeline;
and step three, when the high back pressure steam turbine stops working, steam is conveyed into the main heat supply pipeline through the steam extraction heat supply pipeline.
Optionally, in the first step, when the heat supply load of the main heat supply pipeline changes, the steam inlet amount of the bypass pipeline is changed by adjusting the first adjusting unit so as to meet the change of the heat supply load.
(III) advantageous effects
The invention has the beneficial effects that: according to the supercritical high-backpressure steam turbine heat supply system, a main steam pipeline is connected with a steam inlet pipeline and a bypass pipeline through a tee joint, a steam exhaust pipeline is connected with the main heat supply pipeline after being converged with the bypass pipeline, and a steam extraction heat supply pipeline is converged into the main heat supply pipeline through the tee joint. Compared with the prior art, the industrial heat supply is carried out by utilizing the exhaust steam generated after the high-backpressure steam turbine applies work step by step to generate electricity, the change of heat supply load is ensured by the parallel bypass pipeline, and the stability and the reliability of heat supply are ensured by taking the steam extraction heat supply pipeline as the standby heat supply load. The invention meets the increasing heat demand and heat supply stability requirements of industrial heat users, reduces the plant power consumption, reduces the waste of high-grade energy, improves the effects of energy conservation and emission reduction, and solves the problem that the safe and stable operation of the main steam turbine set is influenced by a large amount of steam extraction and heat supply.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a supercritical high back pressure steam turbine heating system of the present invention.
[ description of reference ]
10: a main steam line; 11: a primary heat supply pipeline;
2: a high back pressure turbine; 20: a steam inlet pipeline; 21: a main steam pressure reducing valve; 22: a main steam valve; 23: a main steam regulating valve; 24: a front shaft seal steam extraction pipeline; 25: a rear shaft seal steam extraction pipeline; 26: a safety valve; 27: a steam exhaust check valve; 28: a steam exhaust pipeline;
30: a bypass line; 31: a first electric control valve; 32: a temperature and pressure reducing valve; 33: a first check valve; 35: a temperature and pressure reducing pipeline; 36: a first electrically powered stop valve;
40: a steam extraction heat supply pipeline; 41: a second electric control valve; 42: a second electrically powered stop valve; 43: a second check valve;
5: a speed reducer;
6: an electric generator.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. As used herein, the terms "upper", "lower", and the like are used with reference to the orientation of FIG. 1.
The supercritical high-backpressure steam turbine 2 heat supply system provided by the embodiment of the invention solves the technical problems of low heat supply stability and low utilization rate of high-grade energy. The supercritical high back pressure steam turbine 2 heat supply system comprises a high back pressure steam turbine 2, a main steam pipeline 10, a steam inlet pipeline 20, a bypass pipeline 30, a steam exhaust pipeline 28, a steam extraction heat supply pipeline 40, a main heat supply pipeline 11 and a controller; the bypass pipeline 30 is sequentially provided with a first adjusting unit, a temperature and pressure reducing unit and a first check valve 33 along the steam flow direction, the steam extraction and heat supply pipeline 40 is provided with a second adjusting unit, the steam inlet pipeline 20 is provided with a third adjusting unit, and the steam exhaust pipeline 28 is provided with a steam exhaust check valve 27. The first adjusting unit, the temperature and pressure reducing unit and the second adjusting unit are all connected with the controller. The high back pressure steam turbine 2 is used for doing work step by step to generate the generated exhaust steam for industrial heat supply, the bypass pipeline 30 connected in parallel guarantees the change of heat supply load, and the steam extraction heat supply pipeline 40 is used as a standby heat supply load to guarantee the stability and the reliability of heat supply. The invention meets the increasing heat demand and heat supply stability requirements of industrial heat users, reduces the plant power consumption, reduces the waste of high-grade energy, improves the effects of energy conservation and emission reduction, and solves the problem that the safe and stable operation of the main steam turbine set is influenced by a large amount of steam extraction and heat supply.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The specific embodiment is as follows:
the invention provides a heating system of a supercritical high back pressure steam turbine 2 as shown in figure 1, wherein the heating system of the supercritical high back pressure steam turbine 2 comprises a high back pressure steam turbine 2, a main steam pipeline 10, a steam inlet pipeline 20, a bypass pipeline 30, a steam exhaust pipeline 28, a steam extraction and heat supply pipeline 40, a main heat supply pipeline 11 and a controller. An inlet of the steam inlet pipeline 20 is connected to an outlet of the main steam pipeline 10, and an outlet of the steam inlet pipeline 20 is connected to a steam inlet of the high back pressure turbine 2. Supercritical steam sequentially passes through the main steam pipeline 10 and the steam inlet pipeline 20 and then enters the high back pressure steam turbine 2 from a steam inlet of the high back pressure steam turbine 2, and the steam does work in the high back pressure steam turbine 2 step by step to push the high back pressure steam turbine 2 to operate. The inlet of the steam exhaust pipeline 28 is connected with the steam exhaust port of the high back pressure steam turbine 2, and the outlet of the steam exhaust pipeline 28 is connected with the inlet of the main heat supply pipeline 11; supercritical steam is discharged from a steam outlet after acting in the high-back-pressure steam turbine 2, enters the main heat supply pipeline 11 after passing through the steam discharge pipeline 28, is used for industrial heat supply, fully utilizes the waste heat of the steam, reduces energy consumption, and avoids the condition that the high-back-pressure steam turbine 2 is unstable in operation due to the fact that the steam inlet of the high-back-pressure steam turbine 2 is reduced by direct steam extraction. The inlet of the bypass line 30 is connected to the outlet of the main steam line 10 and the outlet of the bypass line 30 is connected to the inlet of the main heat supply line 11. The supercritical steam passes through the main steam pipeline 10 and the bypass pipeline 30 and then reaches the main heat supply pipeline 11 for industrial heat supply. The industrial heat supply is carried out through the steam extraction of high back pressure steam turbine 2 during normal heat supply operating mode, and when high back pressure steam turbine 2 shut down, the industrial heat supply is carried out through bypass line 30 to supercritical steam. The bypass line 30 can also be used as a backup and to regulate the heating load, ensuring stability and reliability of heating. The inlet of the steam extraction heat supply pipeline 40 is connected with the outlet of the steam extraction port of the steam turbine unit, and the outlet of the steam extraction heat supply pipeline 40 is connected with the inlet of the main heat supply pipeline 11. When the high back pressure steam turbine 2 is shut down, as the standby heat supply load, the steam extraction heat supply pipeline 40 extracts steam from the steam extraction port of the steam turbine unit, and the steam directly carries out industrial heat supply through the steam extraction heat supply pipeline 40 and the main heat supply pipeline 11, so that the heat supply interruption caused by the shut down of the high back pressure steam turbine 2 is avoided, and the stability and the reliability of heat supply are ensured.
Referring to fig. 1, a first adjusting unit, a temperature and pressure reducing unit, and a first check valve 33 are sequentially disposed on the bypass line 30 along the steam flow direction. The first adjusting unit is used for adjusting the steam amount entering the bypass pipeline 30 so as to meet the change of the heating load; the temperature and pressure reducing unit is used for reducing the temperature and the pressure of the supercritical steam to form subcritical steam for supplying heat; the first check valve 33 can prevent steam from flowing backward when heat is supplied through the bypass line 30. The steam extraction and heat supply pipeline 40 is provided with a second adjusting unit, and the second adjusting unit is used for adjusting the opening/closing of the steam extraction and heat supply pipeline 40 and the steam conveying amount. The steam inlet pipeline 20 is provided with a third adjusting unit, the third adjusting unit is used for reducing the pressure of the supercritical steam to a subcritical state, and the high back pressure steam turbine 2 utilizes the subcritical steam to do work, so that the technical risk and the investment of the high back pressure steam turbine 2 are reduced. The steam exhaust pipeline 28 is provided with a steam exhaust check valve 27 to prevent the steam in the bypass pipeline 30, the main heat supply pipeline 11 and the steam extraction heat supply pipeline 40 from flowing backwards into the high back pressure steam turbine 2 to affect the safety and stability of the operation of the heat supply system. The first adjusting unit, the temperature and pressure reducing unit and the second adjusting unit are all connected with the controller.
Further, the first regulating unit is a first electric regulating valve 31, an inlet of the first electric regulating valve 31 is connected with an outlet of the main steam pipeline 10, an outlet of the first electric regulating valve 31 is connected with an inlet of the temperature and pressure reducing unit, and the first electric regulating valve 31 is connected with the controller. The controller controls the opening of the first electric regulating valve 31 according to the heat, thereby controlling the delivery amount of the steam in the bypass pipeline 30, reducing manual operation and improving the automation degree and the accuracy of system operation.
Further, the temperature and pressure reducing unit includes a temperature and pressure reducing valve 32, a temperature and pressure reducing line 35, and a first electric shutoff valve 36. The pressure reducing and reducing valve 32 includes a pressure control valve, an inlet of which is connected to an outlet of the first electric regulator valve 31, and a desuperheater. The desuperheater is provided with subcritical steam inlet, desuperheating water entry and heat supply steam outlet, and the export and the subcritical steam inlet of pressure control valve are connected, and heat supply steam outlet and the entry linkage of first check valve 33, and the export of desuperheating decompression pipeline 35 is connected the desuperheating water entry through first electric stop valve 36, and the entry linkage condensation water source of desuperheating decompression pipeline 35. Supercritical steam is depressurized into subcritical steam after passing through a pressure controller, the subcritical steam enters a desuperheater from a subcritical steam inlet, meanwhile, condensed water enters the desuperheater from the desuperheater inlet to cool the subcritical steam in the desuperheater, the cooled subcritical steam is output from a heat supply steam outlet and enters a main heat supply pipeline 11 after passing through a first check valve 33 to be used for industrial heat supply. The pressure control valve, the first electrically operated shutoff valve 36 and the desuperheater are all connected to the controller. The controller controls the pressure and temperature of the heating steam by controlling the parameters of the pressure control valve and the desuperheater so as to adapt to different heat demands. The controller controls the opening/closing of the first electric stop valve 36 in real time, and when the bypass pipeline 30 is not used for heating, the first electric stop valve 36 is in a closed state, so that condensed water is prevented from entering the pipeline of the heating system and affecting the normal operation of the heating system.
Preferably, the second regulating unit includes a second electric regulator valve 41, a second electric shutoff valve 42, and a second check valve 43 connected in this order. The inlet of the second electric control valve 41 is connected with the outlet of the steam extraction port of the steam turbine set, and the outlet of the second check valve 43 is connected with the inlet of the main heat supply pipeline 11. The second electric regulator valve 41 and the second electric shutoff valve 42 are both connected to the controller. The controller adjusts the delivery amount of the steam in the steam extraction and heat supply pipeline 40 by controlling the opening degree of the second electric adjusting valve 41, so as to match different heat requirements. The second electric stop valve 42 is used for closing the steam delivery of the steam extraction and heat supply pipeline 40, and the second check valve 43 prevents the steam in the main heat supply pipeline 11, the bypass pipeline 30 and the steam exhaust pipeline 28 from flowing back to the steam extraction and heat supply pipeline 40, so that the safe and stable operation of the heat supply system is ensured.
Preferably, the third regulating unit includes a main steam reducing valve 21, a main steam valve 22 and a main steam regulating valve 23 connected in sequence, an inlet of the main steam reducing valve 21 is connected with an outlet of the main steam pipeline 10, and an outlet of the main steam regulating valve 23 is connected with a steam inlet of the high back pressure turbine 2. The main steam pressure reducing valve 21 is used for reducing the pressure of the supercritical steam conveyed by the main steam pipeline 10; the main steam valve 22 is used to open/close the steam inlet pipeline 20, so as to realize the operation/closing of the high back pressure turbine 2, and the main steam valve 22 is disposed on the pipeline behind the main steam pressure reducing valve 21, so as to avoid the damage of the main steam valve 22 due to the excessive pressure of the supercritical steam or shorten the service life of the main steam valve 22.
Next, a relief valve 26 is provided in the exhaust line 28, and an inlet of the relief valve 26 is connected to an exhaust port of the high back pressure turbine 2. When the exhaust steam pressure of the high back pressure turbine 2 is too large, the safety valve 26 releases the pressure, so that the pressure in the high back pressure turbine 2 is prevented from being damaged due to the fact that the pressure exceeds a set value, and safe and stable operation of the high back pressure turbine 2 is guaranteed.
Then, a front shaft seal steam extraction pipeline 24 and a rear shaft seal steam extraction pipeline 25 are arranged on the high back pressure steam turbine 2, the front shaft seal steam extraction pipeline 24 is connected with a front shaft seal of the high back pressure steam turbine 2, and the rear shaft seal steam extraction pipeline 25 is connected with a rear shaft seal of the high back pressure steam turbine 2. The front shaft seal and the rear shaft seal are respectively extracted through a front shaft seal steam extraction pipeline 24 and a rear shaft seal steam extraction pipeline 25, so that negative pressure is generated in the shaft seals, and the influence on the normal operation of the high-back-pressure steam turbine 2 caused by steam leakage of the steam seals and steam flowing into the bearing bush seat is prevented. In addition, the high back pressure turbine 2 is also provided with conventional auxiliary equipment such as lubricating oil, control oil, a drain pipeline and the like.
And finally, the rotor of the high back pressure turbine 2 is connected with the generator 6 set through the speed reducer 5, and the rotor of the high back pressure turbine 2 rotates to drive the generator 6 set to generate power for users.
In addition, the invention also provides a heat supply method of the supercritical high back pressure turbine 2, which is applied to the heat supply system of the supercritical high back pressure turbine 2 and comprises the following steps:
when the high back pressure steam turbine 2 normally operates, steam sequentially enters the high back pressure steam turbine 2 through the main steam pipeline 10 and the steam inlet pipeline 20, and then is input into the main heat supply pipeline 11 through the steam exhaust pipeline 28 to carry out industrial heat supply, so that the condition that the safety and the stability of the operation of the high back pressure steam turbine 2 are influenced by a large amount of steam extraction for heat supply is avoided. Meanwhile, the steam can also be input into the main heat supply pipeline 11 for industrial heat supply after passing through the main steam pipeline 10 and the bypass pipeline 30 in sequence, so that the effect of adjusting heat supply load is achieved;
when the high back pressure turbine 2 is shut down, the bypass pipeline 30 is used as a standby heat supply pipeline, and steam in the main steam pipeline 10 passes through the bypass pipeline 30 and then is input into the main heat supply pipeline 11 for industrial heat supply, so that the stability and reliability of heat supply are ensured;
when the high back pressure turbine 2 is shut down, the steam extraction heat supply pipeline 40 serves as a standby heat supply pipeline, and the steam extraction heat supply pipeline 40 extracts steam from a steam extraction port of the turbine unit and then inputs the steam into the main heat supply pipeline 11 for industrial heat supply, so that the stability and reliability of heat supply are further ensured.
When the high back pressure steam turbine 2 normally operates and the heat supply load of the main heat supply pipeline 11 changes, the steam inlet amount of the bypass pipeline 30 is changed by adjusting the first adjusting unit to meet the change of the heat supply load, so that the high back pressure steam turbine is suitable for various heat supply loads, and the flexibility of a heat supply system is improved.
In the preferred embodiment, when the high back pressure turbine 2 is operating normally, steam enters the high back pressure turbine 2 through the main steam pipeline 10 and the steam inlet pipeline 20, and then enters the main heat supply pipeline 11 through the steam outlet pipeline 28 for industrial heat supply. When the heat supply load of the main heat supply pipeline 11 changes, steam can also sequentially pass through the main steam pipeline 10 and the bypass pipeline 30 and then is input into the main heat supply pipeline 11 for industrial heat supply, and the function of adjusting the heat supply load is achieved. When the high back pressure turbine 2 is shut down, the bypass pipeline 30 is used as a standby heat supply pipeline, and steam in the main steam pipeline 10 passes through the bypass pipeline 30 and then is input into the main heat supply pipeline 11 for industrial heat supply, so that the stability and reliability of heat supply are ensured; when the high back pressure turbine 2 is shut down, the steam extraction heat supply pipeline 40 serves as a standby heat supply pipeline, and the steam extraction heat supply pipeline 40 extracts steam from a steam extraction port of the turbine unit and then inputs the steam into the main heat supply pipeline 11 for industrial heat supply, so that the stability and reliability of heat supply are further ensured.
The controller controls the states of different adjusting units, the exhaust steam generated after the high back pressure turbine 2 generates electricity is fully utilized for industrial heat supply, and the parallel bypass pipeline 30 ensures the change of heat supply load; the steam extraction heat supply pipeline 40 is used as a standby heat supply load, and the stability and the reliability of heat supply are ensured. The invention meets the increasing heat demand and heat supply stability requirements of industrial heat users, reduces the plant power consumption, reduces the waste of high-grade energy, improves the effects of energy conservation and emission reduction, and solves the problem that the safe and stable operation of the main steam turbine set is influenced by a large amount of steam extraction and heat supply.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (10)
1. The utility model provides a supercritical high back pressure steam turbine heating system which characterized in that, supercritical high back pressure steam turbine heating system includes: the system comprises a high-back-pressure steam turbine, a main steam pipeline, a steam inlet pipeline, a bypass pipeline, a steam exhaust pipeline, a steam extraction heat supply pipeline, a main heat supply pipeline and a controller;
an inlet of the steam inlet pipeline is connected with an outlet of the main steam pipeline, and an outlet of the steam inlet pipeline is connected with a steam inlet of the high back pressure steam turbine;
the inlet of the bypass pipeline is connected with the outlet of the main steam pipeline, and the outlet of the bypass pipeline is connected with the inlet of the main heat supply pipeline;
the inlet of the steam exhaust pipeline is connected with the steam exhaust port of the high-back-pressure steam turbine, and the outlet of the steam exhaust pipeline is connected with the inlet of the main heat supply pipeline;
the inlet of the steam extraction heat supply pipeline is connected with the outlet of a steam extraction port of the steam turbine unit, and the outlet of the steam extraction heat supply pipeline is connected with the inlet of the main heat supply pipeline;
a first adjusting unit, a temperature and pressure reducing unit and a first check valve are sequentially arranged on the bypass pipeline along the steam flow direction, a second adjusting unit is arranged on the steam extraction and heat supply pipeline, a third adjusting unit is arranged on the steam inlet pipeline, and a steam exhaust check valve is arranged on the steam exhaust pipeline;
the first adjusting unit, the temperature and pressure reducing unit and the second adjusting unit are all connected with the controller.
2. The supercritical high back pressure turbine heating system according to claim 1, wherein the first regulating unit is a first electrical regulating valve, an inlet of the first electrical regulating valve is connected to an outlet of the main steam pipeline, an outlet of the first electrical regulating valve is connected to an inlet of the temperature and pressure reducing unit, and the first electrical regulating valve is connected to the controller.
3. The supercritical high back pressure turbine heating system according to claim 2, wherein the temperature and pressure reducing unit comprises a temperature and pressure reducing valve, a temperature and pressure reducing pipeline and a first electric stop valve;
the temperature and pressure reducing valve comprises a pressure control valve and a temperature reducer, and an inlet of the pressure control valve is connected with an outlet of the first electric regulating valve;
the desuperheater is provided with a subcritical steam inlet, a desuperheating water inlet and a heat supply steam outlet, the outlet of the pressure control valve is connected with the subcritical steam inlet, the heat supply steam outlet is connected with the inlet of the first check valve, the outlet of the desuperheating and depressurizing pipeline is connected with the desuperheating water inlet through the first electric stop valve, and the inlet of the desuperheating and depressurizing pipeline is connected with a condensed water source;
the pressure control valve, the first electric stop valve and the desuperheater are all connected with the controller.
4. The supercritical high back pressure turbine heating system according to claim 1 wherein the second regulating unit comprises a second electrically operated regulating valve, a second electrically operated stop valve and a second check valve connected in series;
an inlet of the second electric regulating valve is connected with an outlet of a steam extraction port of the steam turbine set, and an outlet of the second check valve is connected with an inlet of the main heat supply pipeline;
the second electric regulating valve and the second electric stop valve are connected with the controller.
5. The heating system of the supercritical high back pressure turbine according to claim 1, wherein the third regulating unit comprises a main steam pressure reducing valve, a main steam valve and a main steam regulating valve connected in sequence, wherein an inlet of the main steam pressure reducing valve is connected with an outlet of the main steam pipeline, and an outlet of the main steam regulating valve is connected with a steam inlet of the high back pressure turbine.
6. The supercritical high back pressure turbine heating system according to any one of claims 1 to 5, wherein a safety valve is further provided on the exhaust pipe, and an inlet of the safety valve is connected to an exhaust port of the high back pressure turbine.
7. The supercritical high back pressure steam turbine heating system according to any one of claims 1 to 5, wherein a front shaft seal steam extraction pipeline and a rear shaft seal steam extraction pipeline are arranged on the high back pressure steam turbine, the front shaft seal steam extraction pipeline is connected with a front shaft seal of the high back pressure steam turbine, and the rear shaft seal steam extraction pipeline is connected with a rear shaft seal of the high back pressure steam turbine.
8. The supercritical high back pressure turbine heating system according to any one of claims 1 to 5 wherein the rotor of the high back pressure turbine is connected to a generator set via a speed reducer.
9. A supercritical high back pressure steam turbine heat supply method is characterized by comprising the following steps:
when the high-back-pressure steam turbine normally operates, steam in the main steam pipeline sequentially enters the high-back-pressure steam turbine through the main steam pipeline and the steam inlet pipeline and then is input into the main heat supply pipeline through the steam exhaust pipeline, and meanwhile, the steam sequentially passes through the main steam pipeline and the bypass pipeline and then is input into the main heat supply pipeline;
when the high back pressure steam turbine stops, steam in the main steam pipeline is input into the main heat supply pipeline through the bypass pipeline;
when the high back pressure steam turbine stops, steam is conveyed to the main heat supply pipeline through the steam extraction heat supply pipeline.
10. The method for supplying heat to a supercritical high back pressure turbine as claimed in claim 9, wherein when the high back pressure turbine is operating normally and the heat supply load of the main heat supply pipeline is changed, the first adjusting unit is adjusted to change the steam inlet amount of the bypass pipeline to meet the change of the heat supply load.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236383A (en) * | 2021-04-01 | 2021-08-10 | 东方电气集团东方汽轮机有限公司 | Deep thermoelectric decoupling thermodynamic system of coupling heat supply back pressure machine |
| CN113309587A (en) * | 2021-06-23 | 2021-08-27 | 山东电力工程咨询院有限公司 | Ultra-supercritical unit high-flow industrial extraction steam cascade utilization system and method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2078864A (en) * | 1980-06-30 | 1982-01-13 | Wilson Harold | District heating by combined heat and power |
| CN104121047A (en) * | 2014-07-02 | 2014-10-29 | 西安交通大学 | Thermal power plant heat supply and steam extraction overbottom pressure utilization system with back pressure turbine |
| US20140366537A1 (en) * | 2013-06-17 | 2014-12-18 | Alstom Technology Ltd | Steam power plant turbine and control method for operating at low load |
| CN207064022U (en) * | 2017-02-23 | 2018-03-02 | 华西能源工程有限公司 | One kind becomes back pressure thermoelectricity connect product machine set system |
| CN207297114U (en) * | 2017-09-19 | 2018-05-01 | 南京电力设备质量性能检验中心 | A kind of high pressure combining heating system based on back pressure machine technology |
| CN109113818A (en) * | 2017-06-26 | 2019-01-01 | 中国电力工程顾问集团华北电力设计院有限公司 | A kind of enhancing power plant flexibility therrmodynamic system |
| CN109322716A (en) * | 2018-10-16 | 2019-02-12 | 山东华电节能技术有限公司 | Combined cycle gas-steam turbine high back pressure thermal power plant unit and exchanging rotor not brennschluss machine method |
| CN110295957A (en) * | 2019-07-09 | 2019-10-01 | 北京龙威发电技术有限公司 | A kind of feed pump turbine system |
| CN110671162A (en) * | 2019-07-09 | 2020-01-10 | 长兴永能动力科技有限公司 | Steam pressure matcher and control method thereof |
-
2020
- 2020-05-27 CN CN202010464034.1A patent/CN111734505A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2078864A (en) * | 1980-06-30 | 1982-01-13 | Wilson Harold | District heating by combined heat and power |
| US20140366537A1 (en) * | 2013-06-17 | 2014-12-18 | Alstom Technology Ltd | Steam power plant turbine and control method for operating at low load |
| CN104121047A (en) * | 2014-07-02 | 2014-10-29 | 西安交通大学 | Thermal power plant heat supply and steam extraction overbottom pressure utilization system with back pressure turbine |
| CN207064022U (en) * | 2017-02-23 | 2018-03-02 | 华西能源工程有限公司 | One kind becomes back pressure thermoelectricity connect product machine set system |
| CN109113818A (en) * | 2017-06-26 | 2019-01-01 | 中国电力工程顾问集团华北电力设计院有限公司 | A kind of enhancing power plant flexibility therrmodynamic system |
| CN207297114U (en) * | 2017-09-19 | 2018-05-01 | 南京电力设备质量性能检验中心 | A kind of high pressure combining heating system based on back pressure machine technology |
| CN109322716A (en) * | 2018-10-16 | 2019-02-12 | 山东华电节能技术有限公司 | Combined cycle gas-steam turbine high back pressure thermal power plant unit and exchanging rotor not brennschluss machine method |
| CN110295957A (en) * | 2019-07-09 | 2019-10-01 | 北京龙威发电技术有限公司 | A kind of feed pump turbine system |
| CN110671162A (en) * | 2019-07-09 | 2020-01-10 | 长兴永能动力科技有限公司 | Steam pressure matcher and control method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236383A (en) * | 2021-04-01 | 2021-08-10 | 东方电气集团东方汽轮机有限公司 | Deep thermoelectric decoupling thermodynamic system of coupling heat supply back pressure machine |
| CN113309587A (en) * | 2021-06-23 | 2021-08-27 | 山东电力工程咨询院有限公司 | Ultra-supercritical unit high-flow industrial extraction steam cascade utilization system and method |
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