CN211819523U

CN211819523U - Power heating system utilizing low-pressure steam of heat supply network and automatic protection action system thereof

Info

Publication number: CN211819523U
Application number: CN202020191665.6U
Authority: CN
Inventors: 马涛; 李克章; 杨佳伟; 魏庆超; 叶林; 吕剑; 程滨; 郑玉波; 陈勇; 王立红; 唐利军
Original assignee: Qinhuangdao Qinhe Power Generating Co ltd
Current assignee: Qinhuangdao Qinhe Power Generating Co ltd
Priority date: 2020-02-20
Filing date: 2020-02-20
Publication date: 2020-10-30
Anticipated expiration: 2030-02-20

Abstract

The utility model provides an utilize merit thermal system of heat supply network low pressure steam and automatic protection action system thereof, merit thermal system include left side extraction pipe, right side extraction pipe, merit hot steam turbine unit, merit hot steam turbine heater and heat supply network circulating pump heater. The left steam extraction pipe and the right steam extraction pipe are respectively communicated and arranged on the pipe sections of the five-section left heat supply steam extraction main pipe and the five-section right heat supply steam extraction main pipe; the two groups of power-heat steam turbine units are respectively communicated with the left steam extraction pipe and the right steam extraction pipe, and each group of power-heat steam turbine units respectively comprise a power-heat steam turbine for power generation and a power-heat steam turbine with a pump; each power generation heat turbine is connected with a generator, and each power generation heat turbine with a pump is connected with a heat supply network circulating pump; the steam outlet side of the power-generating power-heating steam turbine is communicated with the air passage of the power-heating steam turbine heater, and the steam outlet side of the power-heating steam turbine with the pump is communicated with the air passage of the heat supply network circulating pump heater. The utility model discloses reduced unit thermodynamic system's cold junction loss, reached energy-conserving effect.

Description

Power heating system utilizing low-pressure steam of heat supply network and automatic protection action system thereof

Technical Field

The utility model relates to a heat supply network energy-saving transformation technology especially relates to an utilize merit heating system of heat supply network low pressure steam and automatic protection operating system thereof.

Background

At present, the comprehensive efficiency of energy processing, conversion, storage and transportation and terminal utilization in China is about 33 percent, which is obviously lower than the overall level of developed countries, and the output value and energy consumption ratio is 2 times of the average level in the world, thus causing large total energy consumption in China, high pollutant discharge amount, great influence on global climate and environment, and being concerned by international society.

In 9 months 2014, modification committee, ministry of environmental protection and national energy agency have jointly issued "coal and electricity energy conservation and emission reduction upgrade and modification action plan (2014-2020) (hereinafter referred to as" action plan "), and a plan target that the average power supply coal consumption is lower than 310 g/kilowatt-hour after modification of an existing coal-fired power generating unit in 2020 is provided for ultra-low emission and energy conservation modification actions of a coal-fired power plant in an instructive manner.

The routine conference of the State Council of 12, month and2 in 2015 is used for making the decision of 'speeding up' and 'expanding' for the action plan. The meeting decides to comprehensively implement ultralow emission and energy-saving transformation of the coal-fired power plant, and greatly reduces the coal consumption and pollution emission of power generation. The meeting determines that the ultralow emission and the energy-saving transformation are comprehensively implemented on the coal-fired unit, so that the average coal consumption of all the active power plants per kilowatt hour is lower than 310 g, the average coal consumption of newly-built power plants is lower than 300 g, the obsolete shutdown is firmly determined for the laggard capacity and the situation that the laggard capacity does not meet the requirements of related mandatory standards, and the eastern area and the middle area reach the standards in 2017 and 2018 in advance.

Based on the deadline requirement in the determination and the large situation of upgrading and reconstruction of the industry, each coal-fired power generation enterprise has responded rapidly, and an efficiency improvement and reconstruction scheme for saving energy and reducing consumption is provided and implemented according to each condition.

At present, a part of units of a thermal power plant provide heating and heat supply for a region through fifth-stage steam extraction heating heat supply network circulating water, firstly, a heat supply network system of the thermal power plant is provided with a plurality of heat supply network circulating pumps, the circulating water flow of the heat supply network changes within 3000 t/h-9200 t/h according to the change of the heat supply value, and the power consumption of the heat supply network circulating pump in the whole heating season changes greatly. Secondly, a heat supply system for supplying heat by five-section air extraction is adopted, and certain pressure loss exists between steam from a heat supply steam extraction port and the steam inlet side of a heat supply network heater, so that the plant power consumption rate of a corresponding unit is higher than that of a unit of the same level.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model is to provide an utilize merit heating system of heat supply network low pressure steam to solve the higher problem of the station service power consumption rate that exists in the heat supply unit of current steam power plant.

The second purpose of the utility model is to provide an automatic protection action system of merit thermal system to reduce manual intervention and manual operation, reduce the risk of maloperation.

One of the purposes of the utility model is realized as follows:

a power heating system utilizing low-pressure steam of a heat supply network comprises a left side steam extraction pipe, a right side steam extraction pipe, a power heating steam turbine set, a power heating steam turbine heater and a heat supply network circulating pump heater;

the left side steam extraction pipe and the right side steam extraction pipe are respectively communicated and arranged on pipe sections, located on the outlet side of the check valve, of the five-section left side heat supply steam extraction main pipe and the five-section right side heat supply steam extraction main pipe;

the number of the power-heat steam turbine units is two, the two power-heat steam turbine units are respectively communicated with the left side steam extraction pipe and the right side steam extraction pipe, and each power-heat steam turbine unit comprises a power-generating power steam turbine and a power-heat steam turbine with a pump; each power generation heat turbine is connected with a generator, and each power generation heat turbine with a pump is connected with a heat supply network circulating pump;

the number of the power and heat turbine heaters and the number of the heat supply network circulating pump heaters are 2, the power and heat turbine heaters for power generation correspond to the power and heat turbine heaters one by one, the steam outlet side of the power and heat turbine heaters for power generation is communicated with the air passage of the power and heat turbine heaters, the power and heat turbine heaters for pumps correspond to the heat supply network circulating pump heaters one by one, and the steam outlet side of the power and heat turbine heaters for pumps is communicated with the air passage of the heat supply network circulating pump heaters;

the power and heat turbine heater and the heat supply network circulating pump heater are communicated to the deaerator through a drain pipeline.

And a plurality of drain pumps are arranged on the drain pipeline of the drain side of each power and heat turbine heater in parallel.

And a plurality of drain pumps are arranged on the drain pipeline of the drain side of each heat supply network circulating pump heater in parallel.

The utility model has the advantages that:

the utility model provides an utilize heat supply network low pressure steam electricity generation and drag combination merit heat technique of heat supply network circulating pump, satisfy under the prerequisite of former heat supply load requirement at the unit, install the merit heat turbine behind the heat supply network mother's pipe check valve of bleeding successfully additional, utilize low pressure steam to generate electricity and replace the motor to drag the circulating pump, can realize total net generating power 15652kW of year, annual income increases more than 2000 ten thousand yuan, reduce the plant power rate 2.1% all the year round equivalently, energy-conserving effect is obvious.

The utility model discloses thermodynamic cycle has been changed, greatly reduced unit thermodynamic system's cold junction loss to energy-conserving effect has been reached. The heat supply system of the unit and the operation mode thereof are more reasonable, and the efficiency and the adaptability of the heat supply network system are obviously improved.

The second purpose of the utility model is realized like this:

an automatic protection action system of a power and heat system comprises the power and heat turbine, a front end measurement system and a DCS function module, wherein the front end measurement system and the DCS function module are used for measuring parameters of the power and heat turbine, the DCS function module comprises FSTOUT modules, the number of the FSTOUT modules and the number of the front end measurement systems are consistent with the number of the power and heat turbines and are in one-to-one correspondence, each FSTOUT module is connected between the corresponding front end measurement system and the corresponding power and heat turbine system, and is used for controlling the corresponding power and heat turbine to be in emergency shutdown through internal operation after receiving signals measured by the corresponding front end measurement system, wherein the FSTOUT modules comprise a plurality of groups of terminals, and the terminals respectively complete protection actions on the power and heat turbine.

When the two quick-closing valves of the power and heat turbine are fully opened, a pulse of 5 seconds is sent to reset the FSTOUT output signal, and the fully-opened signals of the two quick-closing valves of the power and heat turbine are reset conditions of the FSTOUT module.

The DCS functional module also comprises a plurality of TIMER modules which are connected between the front-end measuring system and the FSTOUT module, and the TIMER modules are respectively connected with an input terminal Z1, an input terminal Z7, an input terminal Z10, an input terminal Z15 and an input terminal Z16 of the FSTOUT module, so that corresponding measuring signals of the front-end measuring system are sent in a delayed mode or long signals are changed into pulse signals, and an automatic protection action system sends instructions in reasonable time.

The DCS function module further comprises a plurality of QOR8 modules:

the two QOR8 modules are arranged in parallel between the front-end measurement system and an input terminal Z12 of the FSTOUT module and are respectively used for receiving the lubricating oil pressure signal of the power-heating turbine and the AST oil pressure signal of the power-heating turbine;

the input ends of the other two QOR8 modules are connected with the front end measuring system and respectively receive signals indicating that the vibration of a front bearing of a power and heat turbine exceeds standard and signals indicating that the vibration of a rear bearing of the power and heat turbine exceeds standard, and the input ends of the two QOR8 modules are respectively connected with a TIMER module at the connection position of an input terminal Z15 and a TIMER module at the connection position of an input terminal Z17 of the FSTOUT module.

The DCS functional module further comprises an HLALM module, the HLALM module is connected between the front end measuring system and the QOR8 module used for receiving the lubricating oil pressure signals of the power and heat turbine, and the HLALM module receives the pressure transmitter measuring signals sent by the front end measuring system and outputs signals when the lubricating oil pressure of the power and heat turbine is lower than 0.085 MPa.

The DCS functional module further comprises a D/MA module used for realizing the manual shutdown of the power heating turbine DCS, and the output end of the D/MA module is connected with the input terminal Z11 of the FSTOUT module.

AND an AND module AND a TIMER module are sequentially connected between the front-end measurement system AND a reset terminal R of the FSTOUT module, AND the TIMER module is used for resetting the output end of the FSTOUT module through the operation of the FSTOUT module, so that an emergency stop signal can be reset AND disappear when the power AND heat turbine needs to be started.

The utility model has the advantages that:

the utility model provides an automatic protection operating system of merit hot steam turbine, through the design of FSTOUT module, module such as cooperation TIMER module, AND module, D/MA module, QOR8 module, HLALM module has improved the automation AND the degree of safety of the automatic protection operating system of merit hot system, AND personnel that cause injury AND equipment damage when having avoided taking place emergency. The utility model discloses an automatic system has reduced a large amount of manual intervention and manual operation, has reduced the risk of maloperation, makes merit thermal system more stable and intelligent, can the safety of bigger degree ground protection personnel and equipment.

Drawings

Fig. 1 is a schematic structural diagram of a power and heat system of the present invention;

fig. 2 is a structural framework diagram of an automatic protection action system of the power and heat system;

FIG. 3 is a schematic diagram of the automatic protection system of the present invention;

FIG. 3a is an enlarged view of the structure of portion I of FIG. 3;

FIG. 3b is an enlarged view of section II of FIG. 3;

FIG. 3c is an enlarged view of the structure of the portion III in FIG. 3;

FIG. 3d is an enlarged view of the structure of the portion IV in FIG. 3;

FIG. 4 is a schematic diagram of the FSTOUT module of the present invention;

FIG. 5 is a schematic diagram of the logic of the RSFLP module of the present invention;

fig. 6 is a schematic diagram of the logic of the HLALM and QOR8 modules of the present invention;

fig. 7 is a schematic configuration diagram of a protection action 1 of the automatic protection action system;

FIG. 8 is a schematic block diagram of a protection action 2 of the automatic protection action system;

FIG. 9 is a schematic block diagram of a protection action 3 of the automatic protection action system;

FIG. 10 is a schematic block diagram of a protection action 4 of the automatic protection action system;

FIG. 11 is a schematic block diagram of a protection action 5 of the automatic protection action system;

FIG. 12 is a schematic block diagram of a protection action 6 of the automatic protection action system;

FIG. 13 is a schematic block diagram of a protection action 7 of the automatic protection action system;

FIG. 14 is a schematic block diagram of a protection action 8 of the automatic protection action system;

FIG. 15: the utility model discloses logical principle structure chart resets.

In the figure: 1. five sections of left heat supply steam extraction main pipes; 2. five sections of right heat supply steam extraction main pipes; 3. a left side steam extraction pipe; 4. a right side steam extraction pipe; 5. a power-heated steam turbine heater; 6. a heat supply network circulation pump heater; 7. a non-return valve; 8. a power-heated steam turbine; 8-1, a power generation heat turbine; 8-2, a power turbine with a pump; 9. a generator; 10. a drain pump; 11. an electrically operated shutoff valve; 12. a front end measurement system; 13. and a DCS function module.

Detailed Description

The present invention is further illustrated by the following examples, which are given by way of illustration only and are not intended to limit the scope of the present invention in any way.

The first embodiment is as follows:

as shown in fig. 1, adopt the merit thermal system of five sections steam extraction heating, set up two way heat supply steam extraction female pipes in fifth section steam extraction mouth intercommunication, two way heat supply steam extraction female pipes are five sections left sides heat supply steam extraction female pipe 1 and five sections right sides heat supply steam extraction female pipe 2 respectively, all set up check valve 7 on five sections left sides heat supply steam extraction female pipe 1 and five sections right sides heat supply steam extraction female pipe 2, the utility model discloses an utilize merit thermal system of heat supply network low pressure steam, including left side steam extraction pipe 3, right side steam extraction pipe 4, merit heat turbine group, merit heat turbine heater 5 and heat supply network circulating pump 6. The left side steam extraction pipe 3 and the right side steam extraction pipe 4 are respectively communicated with and arranged on pipe sections, located on the outlet side of the check valve 7, of the five-section left side heat supply steam extraction main pipe 1 and the five-section right side heat supply steam extraction main pipe 2. Namely, one path of the five left-side heat supply steam extraction main pipes 1 enters an original heat supply network heater through an adjusting door, and the other path of the five left-side heat supply steam extraction main pipes enters a power heating steam turbine set through a left-side steam extraction pipe 3; one path of the five right-side heat supply steam extraction main pipes 2 enters an original heating network heater through an adjusting door, and the other path of the five right-side heat supply steam extraction main pipes enters the power heating steam turbine set through the right-side steam extraction pipe 4. The number of the power-heat steam turbine units is two, the two power-heat steam turbine units are respectively communicated with the left steam extraction pipe 3 and the right steam extraction pipe 4, and each power-heat steam turbine unit comprises a power-heat steam turbine 8-1 for power generation and a power-heat steam turbine 8-2 with a pump. Each power generation heat turbine 8-1 is connected with a generator 9. Each belt pump is connected to a heat supply network circulation pump (not shown) by a work turbine 8-2. In this embodiment, the communicating structure between the left side steam extraction pipe 3 and the corresponding power heat turbine set is as follows: two branches are divided from the middle section of the left side steam extraction pipe 3, the two branches are respectively connected with corresponding power-heating turbines, the inlet section of the left side steam extraction pipe 3 is provided with an electric stop valve 11, two communicating pipes are arranged between the outlet end of each branch and the steam inlet of the turbine in parallel, a main steam valve and a regulating valve are respectively arranged on the two communicating pipes, a quick-closing valve is arranged on each communicating pipe and is located at the outlet section of the corresponding communicating pipe, the main steam valve is the main steam valve shown in figure 1, the regulating valve is the auxiliary valve shown in figure 1, and the main steam valve and the regulating valve are matched with the corresponding power-heating turbines. The utility model discloses a steam turbine's that merit was heated to right side steam extraction pipe 4 and corresponds connectivity structure and above left side steam extraction pipe 3 the connectivity structure with the merit that corresponds is hot steam turbine's that corresponds is the same, differs here and gives unnecessary a perk, and in addition, the setting of fast valve of closing is the conventional setting in the steam power plant, not the utility model discloses a point. The number of the power and heat turbine heaters 5 and the number of the heat supply network circulating pump heaters 6 are 2, the power and heat turbine 8-1 for power generation corresponds to the power and heat turbine heaters 5 one by one, the steam outlet side of the power and heat turbine 8-1 for power generation is communicated with the gas circuit of the power and heat turbine heaters 5, the power and heat turbine 8-2 with a pump corresponds to the heat supply network circulating pump heaters 6 one by one, and the steam outlet side of the power and heat turbine 8-2 with a pump is communicated with the gas circuit of the heat supply network circulating pump heaters 6.

The power-heating steam turbine heater 5 and the heat supply network circulating pump heater 6 are communicated to a condensed water deaerator (not shown in the figure) through a drain pipeline, the condensed water deaerator is common and necessary equipment of a heating system of a thermal power plant, and the condensed water deaerator is set to be conventional setting of the thermal power plant. All set up many drainage pumps 10 side by side on the hydrophobic pipeline of 5 hydrophobic sides of every merit hot steam turbine heater, because this merit hot system is installed at the five sections steam extraction departments of Qin hot #6 unit, the hydrophobic of every merit hot steam turbine heater 5 is carried to #6 unit condensate water oxygen-eliminating device import department through many drainage pumps 10, and drainage pump 10 is the frequency conversion drainage pump, and in this embodiment, the quantity of drainage pump 10 is 3, and wherein two operation, one is for-use. All set up many drainage pumps 10 on the hydrophobic pipeline of every heat supply network circulating pump heater 6 hydrophobic side by side, its drainage pump set up with the setting of merit hot steam turbine heater 5 the same, promptly every merit hot steam turbine heater 5's drainage carry to the import department of #6 unit condensate water oxygen-eliminating device through many drainage pumps 10, and drainage pump 10 is the frequency conversion drainage pump, and in this embodiment, the quantity of drainage pump 10 is 3, and wherein two operation, a stand-by. Each drainage pump 10 is provided with a front and a rear manual stop valves, an outlet check valve, a water discharge and air release valve, so that the operation and maintenance are convenient. Each power heating steam turbine heater 5 and each heat supply network circulating pump heater are provided with a turning plate liquid level meter, a liquid level switch, a water level transmitter and manual drain and vent stop valves at the steam side and the water side. The pipelines on the water inlet side of each power and heat turbine heater 5 and the pipelines on the water inlet side of each heat supply network circulating pump heater 6 are all arranged in parallel, and the pipelines on the water outlet side of each power and heat turbine heater 5 and the pipelines on the water outlet side of each heat supply network circulating pump heater 6 are all arranged in parallel.

The Qinhuang island Qin heat power generation Limited liability company (abbreviated as Qinhuan company in the text) utilizes the fifth stage of steam extraction to heat the circulating water of the heat supply network, thereby meeting the current and future heating demand in Qinhuang island. The steam extraction pressure at the steam extraction port of the fifth section for heat supply is 0.38MPa (a), the steam extraction temperature is 255.9 ℃, the rated steam extraction quantity is 550t/h, the water temperature of the designed inlet and outlet of the front heater of the #6 unit as the first stage is 70/105 ℃ (the actual operation is 55/90 ℃), and the steam side pressure of the heater is about 0.1MPa (a). The designed inlet and outlet water temperature of the front heater of the #6 unit as the first stage is 70/105 ℃ (the actual operation is 55/90 ℃), and the steam side pressure of the heater is about 0.1MPa (a). The pressure loss of 0.2-0.3 MPa exists from the heat supply steam extraction port to the steam inlet side of the heat supply network heater, so that the plant power consumption rate of the unit is higher than that of the unit of the same level. The utility model discloses a this partial pressure drop of merit thermal system make full use of, both the steam enthalpy drop electricity generation of make full use of high-quality does not influence the performance of heat supply network heater again, reaches energy-concerving and environment-protective dual function. Meanwhile, a large amount of electric energy can be saved, the plant power consumption rate is reduced, and the economic index and the benchmarking capability of unit operation are improved.

In the utility model, the steam inlet adjusting door of the central heating network heater and the low adjusting door of the main steam turbine are matched and adjusted in operation, and the steam inlet pressure of the power heating steam turbine is maintained at 0.38MPa (a) and above. The rotation speed of the newly added power-heating steam turbine is adjusted by a speed adjusting valve, and exhaust steam is discharged to the corresponding newly added heater. The water side and the steam side of the heater newly added to the heat supply network and the original heater are operated in parallel. Drainage of the original heat supply network heater and drainage of the newly added heater are both discharged to the inlet of a condensed water deaerator of the #6 unit. The utility model provides a merit heating system and former heating network system operate side by side.

The utility model provides an utilize heat supply network low pressure steam power generation and drag combination merit heat technique of heat supply network circulating pump, satisfy under the prerequisite of former heat supply load requirement at the unit, install the ultra-low pressure steam turbine behind the female pipe check valve of heat supply network extraction successfully additional, utilize low pressure steam to generate electricity and replace the motor to drag the heat supply network circulating pump, realize total net generated power 15652kw in year, annual income increases more than 2000 ten thousand yuan, reduce the plant power rate 2.1% all the year round in other words, energy-conserving effect is obvious.

In this embodiment:

one, will the utility model discloses a merit heating system installs #6 unit to Qin hot company additional

The power-heat steam turbine 8-1 for power generation is a 6000kW steam turbine, the generator 9 is a 6000kW high-voltage asynchronous generator, electricity generated by the power-heat steam turbine 8-1 for power generation is directly merged into a power plant high-voltage power plant electricity utilization system, steam inlet of the power-heat steam turbine 8-1 for power generation is taken from a heat supply network steam supply main pipe and is isolated from an original system by a valve, the independence of the original system is kept, a newly-increased heat supply network heater and the original heater run in parallel, steam discharged by the power-heat steam turbine 8-1 for power generation is discharged to the power-heat steam turbine heater 5, the drain water of the power-heat steam turbine heater 5 is conveyed to the inlet of a condensate water deaerator of a #6 unit through a drain pump 10, and finally the drain.

The Qin and Heat company #5 and #6 sets provide heating and steam extraction for Qinhuang island, the heat network heaters of the two sets are connected in series, and the steam extraction amount of the sets is freely adjusted by taking the maximum steam extraction amount corresponding to the load of the sets as a limit. According to the historical heating steam extraction information of Qin fever, the heating steam extraction amount reaches more than 500t/h at the initial heating stage. Therefore, in the season of heating in the future, through the relative steam extraction volume of adjusting #5, #6 unit, the utility model discloses a merit thermal system can all full load operation in full heating phase, and the operating mode is adjusted simply. When the system is overhauled or failed, because the newly-increased power heating system is connected with the original heating network system in parallel, the newly-increased system can be cut off, and the heat supply requirement can be met through the original system.

The heat supply network system of Qin heating company is provided with 4 2200kW heat supply network circulating pumps, and the high-frequency chopping cascade speed regulation control is carried out, wherein two heat supply network circulating pumps run in normal operation and two heat supply network circulating pumps are standby. The circulating water flow of the heat supply network changes within 3000 t/h-9200 t/h according to the change of the heat supply value, and the power consumption of the circulating pump of the heat supply network in the whole heating season changes greatly. The total power consumption of one heating season in 2015 is 7174392kWh, and the average power consumption of a single heat supply network circulating pump per hour is 996.44 kW.

The work heat turbine 8-2 with the pump is a 2200kW steam turbine, and each work heat turbine 8-2 with the pump drags 1 original heat supply network circulating pump. The inlet steam of the power steam turbine 8-2 with the pump is also taken from a steam supply main pipe of a heat supply network, the steam is isolated from the original system by a valve, a matched heat supply network circulating pump heater 6 also runs in parallel with the original heater, the exhaust steam of the power steam turbine 8-2 with the pump is also discharged to the matched heat supply network circulating pump heater 6, the drainage of the heat supply network circulating pump heater 6 is conveyed to the inlet of a condensate water deaerator of a #6 unit by a drainage pump 10, and finally the exhaust steam is discharged to the outlet of the condensate water with the lower concentration of the # 6.

According to historical operation data of a heat supply network heater of a Qin Heat company #6 unit and operation records of a heat supply network circulating pump, 2 additional heat-supply steam turbines 8-2 with pump driving heat supply network circulating pumps of 2200kW operate for a long time under the working condition lower than the rated load, and the operation load is adjusted according to the heat supply network load and the water quantity change of the heat supply network.

The utility model discloses a pressure differential energy of merit thermal system make full use of extraction of vapour takes partial five sections heating extraction out, and the leading former heat supply network heater of row is gone into again after getting into the merit heat turbine of ultralow pressure and doing work, and the merit that the merit heat turbine of utilizing ultralow pressure was done generates electricity and drags the heat supply network circulating pump. The two heat supply network circulating pumps adjust the rotating speed through the power turbine 8-2 with the pump to achieve the purpose of adjusting the circulating water quantity of the heat supply network.

The working principle of the power generation method is that the pressure loss of the heating extraction steam is fully utilized to generate electricity, the steam consumption increased by the power generation method is less, the unit can still meet the rated heat supply load while the power turbine generates electricity, and the improved system is shown in figure 1.

In the improved heat supply network system, the exhausted steam of the power and heat turbine completely enters the newly added heater, the loss of the cold end is equal to zero, and the steam leakage of the door lever and the steam leakage of the shaft seal of the power and heat turbine are completely absorbed by the newly added heater. Although the relative internal efficiency of a power hot turbine is not as high as that of a large turbine, the modified heat supply network system has almost no cold end loss. The direct operation power and heat turbine only has 1% of mechanical bearing loss, and the power generation heat consumption for dragging the asynchronous motor to generate power is only 3868 kJ/(kWh) (the calculation basis is that the bearing loss of the power and heat turbine is 1%, the generator efficiency is 94%, and the power generation heat consumption rate of the power and heat turbine is 3600/(1-1%)/94%), which is far lower than the power generation heat consumption rate of a large turbine.

In the improved heat supply network system, as 2 power generation heat turbine machines are added, under the condition of ensuring constant heat supply quantity, the steam extraction quantity of five sections is increased by 18.22 t/h; when the steam turbine system runs at full load, the extraction steam quantity needs to be increased by 6.62 t/h; when the power-heat steam turbine generator system and the power-heat steam turbine of the heat supply network circulating pump system are all in full load operation, the total steam extraction amount needs to be increased by 24.84 t/h. In 2015, the capacity of an Qin heating #6 unit is increased to 330MW through flow transformation, the steam inlet amount of a steam turbine is increased by 105t/h under the THA working condition, and the five steam extraction amount is increased by 35t/h, so that the rated heat supply load of the unit cannot be influenced by full-load power generation of a power and heat steam turbine.

The running safety is high, the power and heat steam turbine adopts a single-cylinder five-stage type, the unit is provided with two overspeed protections, namely electric overspeed and mechanical overspeed, the flying speed of the impactor is set in a manufacturing plant, and an overspeed test is carried out on site. The rotating speed control system adopts an inlet device to ensure stable rotating speed, and the control system is fully electrically controlled to ensure that the rotating speed does not deviate within 3rpm of the target rotating speed. Due to the adoption of the system redundancy design, the power and heat system can be switched with the original system on line, so that the impact on the safety of the original system is avoided, and the safety is high.

In the aspects of the asynchronous generator and electricity correlation thereof, the power generation quality is determined by the self structural condition of the asynchronous generator, and the asynchronous generator obtains exciting current from a power grid or station service without an exciting device and an excitation adjusting device; the step-out phenomenon does not exist, and the load can be matched according to the unit capacity during operation; the rotor has simple structure, large heat capacity and strong endurance to higher harmonic load. The asynchronous generator is free of a direct-current excitation system and a slip ring electric brush from the aspect of economy, so that the operation and maintenance cost is low.

It should be noted that, in the parallel operation mode with the plant power grid, the asynchronous generator outputs active power to the power grid on one hand, and needs to absorb lagging reactive power from the power grid on the other hand, so as to meet the requirement of reactive power consumed by excitation and leakage of stator and rotor.

The technical and operation safety analysis of the reconstruction project shows that the power and heat steam turbine is adopted to generate electricity by utilizing the pressure difference of heating steam extraction or directly drag a heat supply network circulating pump, so that the rated heat supply load of a unit can not be influenced, the service power can be reduced, the electric energy quality is controllable, and the safety protection measures are feasible.

Second, actual operation effect

The report of the experiment on the performance acceptance of the transformation engineering of the heat and power turbine of the #6 unit of Qinhuang island Qin thermal power generation Limited company (serial number: the Jinengae department 2016-QR-QJ-002) issued by Hebei Ji research institute of energy science and technology has the following data:

table 1: performance index of No. 1 power generation heating turbine under test working condition

In table 1, the power-heating turbine No. 1 is a power-generating power-heating turbine 8-1 connected to the right extraction pipe 4, and the heat supply network heater No. 1 is a power-heating turbine heater associated with the power-heating turbine.

Table 2: performance index of No. 2 power generation steam turbine under test working condition

In table 2, the power-heating turbine No. 2 is a power-generating power-heating turbine 8-1 connected to the left extraction pipe 3, and the heat supply network heater No. 2 is a power-heating turbine heater matched with the power-heating turbine.

Table 3: performance index of No. 3 driving steam turbine under test working condition

In table 3, the power-heating turbine No. 3 is a power-heating turbine 8-2 with a pump connected to the right extraction pipe 4, and the heat supply network heater No. 3 is a heat supply network circulation pump heater matched with the power-heating turbine.

Table 4: performance index of No. 4 driving steam turbine under test working condition

In table 4, the No. 4 power steam turbine is a power steam turbine 8-2 with a pump connected to the left extraction pipe 3, and the No. 4 heat supply network heater is a heat supply network circulation pump heater matched with the power steam turbine.

Second, conclusion and suggestion of experiment

(1) The No. 1 power heat turbine has the steam inlet pressure of 0.367MPa, the steam exhaust pressure of 0.0804MPa, the steam inlet flow rate of 83.97t/h, the internal efficiency of the turbine of 85.47 percent and the power of a generator of 5893.59 kW.

(2) The No. 2 power heat turbine has the steam inlet pressure of 0.367MPa, the steam exhaust pressure of 0.0773MPa, the steam inlet flow of 89.88t/h, the internal efficiency of the turbine of 86.09 percent and the power of a generator of 6070.36 kW.

(3) The No. 3 power heat turbine has the advantages of steam inlet pressure of 0.366MPa, steam exhaust pressure of 0.073MPa, steam inlet flow of 49.64t/h, turbine internal efficiency of 42.54% and generator power of 1871.41 kW.

(4) The No. 4 power heat turbine has the steam inlet pressure of 0.368MPa, the steam exhaust pressure of 0.0778MPa, the steam inlet flow of 49.79t/h, the internal efficiency of the turbine of 42.54 percent and the power of the generator of 1817.61 kW.

No. 1 and No. 2 power-heating steam turbine generator sets reach a guaranteed continuous 5600kW guaranteed value; no. 3, 4 unit heat supply steam turbines drag the heat supply network circulating pump, satisfy the first station water supply requirement of heat supply.

Under the important condition that current energy saving and emission reduction has become whether the enterprise can survive, the utility model discloses break conventional mode, initiate the combination merit heat mode of heat supply network low pressure steam power generation and drag pump, for the electric power industry and use other trades energy saving work of low pressure steam provide important reference, made important contribution for the energy saving and emission reduction of whole society.

Example two:

as shown in fig. 2, the automatic protection action system of the utility model discloses a power and heat system, including power and heat turbine 8, the front end measurement system 12 and the DCS function module 13 that are used for measuring power and heat turbine parameters as in embodiment 1. The front-end measuring system comprises various measuring devices for measuring parameters of the power and heat turbine 8 and the Bente Li system. As shown in fig. 2, 3a, 3b, 3c and 3d, the power generation heat turbine 8-1 and the power turbine 8-2 with pump in embodiment 1 are both the power heat turbines 8 in this embodiment, the DCS function module 13 includes FSTOUT modules, the number of the FSTOUT modules and the front end measurement systems 12 is the same as the number of the power heat turbines 8, and each FSTOUT module is connected between the corresponding front end measurement system and the corresponding power heat turbine system, in this embodiment, the power heat turbine No. 1 is taken as an example for explanation, that is, the power generation heat turbine 8-1 connected to the right side steam extraction pipe 4 is taken as an example for explanation, the connection structure of the other power heat turbine 8-1, the two power turbines with pump, the corresponding front end measurement system and the FSTOUT module is the same, that is, the other power turbines 8 and the corresponding front end measurement systems, The connection structures of the FSTOUT modules are the same and are not described in detail herein. The DCS system formed by the DCS functional module 13 adopts a Shanghai Xinhua DCS 800+ system. Each FSTOUT module is configured to control the corresponding power and heat turbine to perform an emergency shutdown through internal operation after receiving a signal measured by the corresponding front-end measurement system 12, where the FSTOUT module includes a plurality of groups of terminals, each group of terminals are independent of each other, and each group of terminals can receive signals individually or simultaneously. The input terminal is used for receiving signals measured by a measuring device in a front-end measuring system or a Bente-Li system, and the output terminal is used for sending out and controlling a power and heat system where the power and heat turbine is located to complete corresponding instructions. Each group of terminals respectively complete the following protection actions performed on the power and heat turbine, wherein the following protection actions are performed independently or simultaneously:

protection action 1: tripping protection action of a generator breaker of the power heating steam turbine: when the circuit breaker of the generator is in a closing state and not in a breaking state, the protection of the power and heat turbine is automatically put into use, and when a closing state signal disappears, the power and heat turbine is stopped emergently. After the generator 9 of the power and heat turbine is normally started, when the breaker of the generator is in a closing state and not in an opening state, the breaker is tripped to protect and automatically put into use.

Protection action 2: the high protection action of tile temperature of the thrust tile of merit hot steam turbine, the preceding axle bush of merit hot steam turbine, the back axle bush of merit hot steam turbine, the axle bush before the generator or the axle bush behind the generator: when one or more of the tile temperatures are rapidly increased and exceed a limit value, delaying for 3 seconds, and emergently stopping the power and heat turbine;

protection action 3: the sudden closing protection action of the quick closing valve when the power and heat turbine operates: when the two quick closing valves are closed suddenly to cause no steam admission of the steam turbine, the time is delayed for 2 seconds, and the power and heat steam turbine is stopped emergently in a normal operation state. When the power and heat turbine normally operates, the quick-closing valve full-closing protection is automatically put into operation, namely, when the power and heat turbine normally operates, the protection action 3 is automatically put into operation.

Protection action 4: protection action of axial displacement of the power and heat turbine: when the axial displacement of the power and heat turbine is increased to a limit value, the time is delayed for 2 seconds, and the power and heat turbine is stopped emergently. In this embodiment, the signals with large axial displacement of the power and heat turbine are logically judged by the board card of the present tesile system and then sent to the input end of the FSTOUT module.

Protection action 5: and (3) lubricating oil pressure protection action of the power heating steam turbine: the pressure of the lubricating oil is monitored by two pressure switches and a pressure transmitter, and when the pressure of the lubricating oil is lower than a limit value, the power and heat turbine is stopped emergently. In the protection action, the measurement is carried out by two pressure switches and a pressure transmitter, the pressure of the lubricating oil is reduced to a limit value, the pressure transmitter displays that the oil pressure is lower than 0.085MPa, and two of the three conditions can be selected randomly to stop the power and heat turbine urgently.

Protection action 6: and (4) performing manual shutdown of the power and heat turbine or DCS manual shutdown protection action. In the present embodiment, the power steam turbine 8 has two emergency manual operation buttons, i.e., a manual console emergency stop button and a DCS emergency stop button.

Protection action 7: the ETS of the power and heat turbine is shut down and protected: monitoring by three pressure switches, and when the AST oil pressure is lower than a limit value, the power-heating steam turbine is stopped emergently;

protection action 8: vibration protection of front and rear bearings of the power heating steam turbine: when the biphase vibration of the power and heat turbine reaches a limit value, the power and heat turbine is emergently stopped. In this embodiment, the large bearing vibration signal is logically determined by the board card of the system of this patent and then sent to the input terminal of the FSTOUT module.

When the two quick-closing valves of the power and heat turbine are fully opened, a 5-second pulse is sent to reset the FSTOUT output signal, and the fully-opened signals of the two quick-closing valves of the power and heat turbine are reset conditions of the FSTOUT module.

The DCS functional module also comprises a plurality of TIMER modules which are connected between the front-end measuring system and the FSTOUT module, and the TIMER modules are respectively connected with an input terminal Z1, an input terminal Z7, an input terminal Z10, an input terminal Z15 and an input terminal Z16 of the FSTOUT module, so that corresponding measuring signals of the front-end measuring system are sent in a delayed mode or long signals are changed into pulse signals, and the automatic protection action system sends instructions in reasonable time.

The DCS function module also includes a plurality of QOR8 modules: two QOR8 modules are arranged in parallel between the front end measurement system and the input terminal Z12 of the FSTOUT module, and are respectively used for receiving a power and heat turbine lubricating oil pressure signal and an AST oil pressure signal of the power and heat turbine and respectively controlling the protection action 5 and the protection action 7. Each QOR8 module is used for ensuring that any two of the three corresponding signal inputs are valid and outputting signals; the input ends of the other two QOR8 modules are connected with a front-end measuring system, and respectively receive a power-heat turbine front bearing vibration exceeding signal and a power-heat turbine rear bearing vibration exceeding signal for controlling a protection action 8, the input ends of the two QOR8 modules are respectively connected with a TIMER module at the connection position of an input terminal Z15 and a TIMER module at the connection position of an input terminal Z17 of the FSTOUT module, wherein each QOR8 module is used for ensuring that any one of the two signal inputs is effective and can output signals.

The DCS functional module further comprises an HLALM module, the HLALM module is connected between the front end measuring system and the QOR8 module used for receiving the pressure signals of the lubricating oil of the power heating turbine, and the HLALM module receives the measuring signals of the pressure transmitter sent by the front end measuring system and outputs signals when the pressure of the lubricating oil of the power heating turbine is lower than 0.085 MPa.

The DCS functional module also comprises a D/MA module used for realizing the manual shutdown of the DCS of the power heating turbine, and the output end of the D/MA module is connected with the input terminal Z11 of the FSTOUT module.

The AND module AND the TIMER module are sequentially connected between the front-end measurement system AND the reset terminal R of the FSTOUT module, AND the TIMER module is used for resetting the output end of the FSTOUT module through the FSTOUT module for ensuring that the emergency stop signal can be reset AND disappear when the power AND heat turbine needs to be started.

The present embodiment will now be described in detail as follows:

fig. 3 is the utility model provides a structure schematic diagram of automatic protection action system of merit hot steam turbine, the connection structure who uses No. 1 merit hot steam turbine, the front end measurement system that corresponds and the DCS module that corresponds promptly for the example, the setting of other merit hot steam turbines all is unanimous with the setting of No. 1 merit hot steam turbine, does not give unnecessary detail here one by one. As shown in FIG. 3, the input terminal of the FSTOUT module is connected with the TIMER module, the AND module, the D/MA module, the QOR8 module, the HLALM module AND the RSFLP module in combination. The output terminal is connected with the power and heat turbine. Considering the protection requirement of the FSTOUT module, at least sixteen groups of terminals are arranged in the FSTOUT module, only fourteen groups of terminals are used in the example, each group of terminals is used for receiving a protection signal to realize a protection function, and after the power and heat turbine is connected to the output terminal of the FSTOUT module, the output terminal can also send a signal to linkage equipment which needs to act after emergency shutdown of other power and heat turbines to complete corresponding instructions. In addition, in each group of terminals, the input terminal directly receives signals or receives signals through other modules, and the input terminal directly receives signals or receives signals again through other modules, so that the safety and timeliness of the emergency shutdown system can be ensured according to specific conditions.

The first group of terminals are FSTOUT module receiving terminals Z1 (shown in figure 7), generator circuit breaker closing state signals of the power-heat steam turbine are connected with a TIMER module setting input end, the TIMER module is connected with an AND module input end 1 in an inverted mode, generator circuit breaker opening state signals are connected with an RSFLP module resetting input end, a TIMER module TIMER output end is connected with an RSFLP module setting input end, an RSFLP module state output end is connected with an AND module input end 2, an AND module operation output end is connected with the FSTOUT module receiving terminals Z1, AND the power-heat steam turbine is used for achieving automatic input of power-heat steam turbine circuit breaker closing protection in a normal state AND emergency shutdown of the power-heat steam turbine when the closing state disappears.

The second to sixth groups of terminals are FSTOUT module receiving terminals Z2 to Z6 (as shown in fig. 8), and thrust pads, front and rear bearing pad temperatures of the power and heat turbine and front and rear shaft pad temperature signals of a generator of the power and heat turbine are connected with the FSTOUT module receiving terminals after temperature judgment logic, so that the power and heat turbine is emergently stopped when the temperature of each bearing pad is rapidly increased and exceeds a limit value.

The seventh group of terminals are FSTOUT module receiving terminals Z7 (as shown in fig. 7), full-off signals of a power AND heat turbine quick-closing valve 1 AND full-off signals of a quick-closing valve 2 are respectively connected with an input end 1 AND an input end 2 of an AND1 module, an operation output end of an AND1 module is connected with an input end 2 of an AND2 module, operating state signals of the power AND heat turbine are connected with the input end 1 of the AND2 module through a D/MA module, an operation output end of an AND2 module is connected with a set input end of a TIMER module, an output end of a TIMER of the TIMER module is connected with an FSTOUT module receiving terminal Z7, AND the FSTOUT module is used for realizing that the power AND heat turbine does not have steam admission AND the power AND heat turbine is emergently stopped when the power AND heat turbine is.

The eighth group of terminals is an FSTOUT module receiving terminal Z8 (as shown in fig. 10), after the axial displacement is measured by the power and heat turbine axial displacement sensor, the axial displacement is logically judged by a clamping piece of the benley system, and a large axial displacement output signal is connected with the FSTOUT module receiving terminal Z8, so that the power and heat turbine is emergently stopped when the axial displacement is large and exceeds a protection fixed value.

The ninth group of terminals is an FSTOUT module receiving terminal Z9 (as shown in fig. 11), two lubricating oil pressure switches of the power and heat turbine are respectively connected with an input end 1 and an input end 2 of a QOR8 module, signals measured by the power and heat turbine lubricating oil pressure transmitter are connected with an input end 3 of the QOR8 module after being limited by the HLALM module, an output end of the QOR8 module is connected with the FSTOUT module receiving terminal Z9, and the FSTOUT module is used for realizing emergency shutdown of the power and heat turbine under the condition that the power and heat turbine lubricating oil pressure is low.

The tenth and eleventh groups of terminals are FSTOUT module receiving terminals Z10 to Z11 (as shown in fig. 12), a manual stop button of a power and heat turbine console and a manual stop button of a power and heat turbine DCS, and are used for enabling a worker to manually stop the power and heat turbine in time under special conditions.

The twelfth group of terminals is an FSTOUT module receiving terminal Z12 (as shown in fig. 13), three AST oil pressure switches of the power and heat turbine are respectively connected with the input end 1, the input end 2 and the input end 3 of the QOR8 module, the output end of the QOR8 module is connected with the FSTOUT module receiving terminal Z12, and the FSTOUT module is used for realizing that the ETS stops the power and heat turbine in an emergency through FSTOUT module operation.

The fifteenth and sixteenth groups of terminals are FSTOUT module receiving terminals Z15 and Z16 (as shown in fig. 14), vibration values of front (rear) bearing vibration sensors 1 and2 of the power and heat turbine are measured and then logically judged by a clamping piece of the system, an overproof signal of a vibration measuring point 1 of the front (rear) bearing and an overproof signal of a vibration measuring point 2 of the front (rear) bearing are provided, the two signals are respectively connected with an input end 1 and an input end 2 of a QOR8 module, an output end of the QOR8 module is connected with a positioning end of a TIMER module, a timing output end of the TIMER module is connected with the FSTOUT module receiving terminal Z15(Z16), and the FSTOUT module receiving terminals Z15 and Z16 are used for realizing the emergency stop of the power and heat turbine when the front.

The seventeenth group of terminals are FSTOUT module reset terminals R (as shown in fig. 15), full-open signals of a quick-closing valve 1 AND full-open signals of a quick-closing valve 2 of the power-heating steam turbine are respectively connected with an input end 1 AND an input end 2 of an AND1 module, an operation output end of an AND1 module is connected with a setting input end of a TIMER module, an output end of a TIMER of the TIMER module is connected with a receiving terminal Z17 of the FSTOUT module, AND the FSTOUT module is used for resetting the output end of the FSTOUT module through operation of the FSTOUT module, so that emergency stop signals can be reset AND disappear when the power-heating steam.

To illustrate a complete working cycle of the present invention:

when the power AND heat turbine operates normally, the fourteen protections are all in an on state, AND a measurement parameter in any one protection suddenly changes, as shown in fig. 7, a closing state signal of a normally started power AND heat generator circuit breaker appears, the signal enters a set input end of a TIMER module, AND after 3 seconds of delay according to a mode AND time set by the TIMER module, the signal is sent to a set end of an RSFLP module, AND under the condition that a brake separating state signal of the power AND heat generator circuit breaker is not sent to a reset input end of the RSFLP module, a signal is sent to an output end of the RSFLP module, the automatic on-line generator circuit breaker is automatically turned on for tripping protection, AND then once an abnormal condition appears, the generator circuit breaker is suddenly tripped, at the moment, in the period of time that the closing state of the circuit breaker disappears but the brake separating state does not appear, the automatic shutdown protection can quickly send a signal to the FSTO, and let other linkage equipment action through the output of FSTOUT module, other linkage equipment's specific action is: the steam turbine generator breaker is opened, the electric door of the steam inlet of the power and heat steam turbine is closed, the quick closing valve of the power and heat steam turbine is closed, and the main and auxiliary valves of the inlet steam of the power and heat steam turbine are closed.

The utility model discloses the function of well constitution module is as follows:

FSTOUT function block: and a switching value input first-out module in the system. When any one or more of the Z values at the inputs is 1, the output D1 is 1.

TIMER function block: a delay module in the system. When the TD _ ON mode is used, when the input SET is 1, the output D is changed from 0 to 1 after the delay time SET by DT; when the input SET is 0, the output D immediately changes to 0; when the PULSE mode is used, when the input SET is 1, the output D is changed from 0 to 1 and the time length is DT; when the input SET is 0, the output D immediately becomes 0.

AND function block: and an operation module in the system. When both inputs Z1, Z2 go to 1, the output D is 1, otherwise the output D is 0.

D/MA function block: a button module in the system. The module output D can be changed into 0 or 1 according to the operation of an operator; or when the input TS is 1, the output D is forced to track the value of the input TR, i.e. when TS is 1, D ═ TR.

QOR8 function block: and a logic judgment module in the system. The module output D can be changed into 0 or 1 according to different parameter modes; when the parameter mode is 1, the output D is 1 as long as one or more values of the three inputs Z1, Z2 and Z3 are 1; when the parameter pattern is 2, the output D is 1 if two or more of the three inputs Z1, Z2, and Z3 have values of 1.

RSFLP functional block: a trigger module in the system. The module output D can confirm the state of the output D according to the states of R and S; when R is 0, S is 1, D is 1, otherwise D is 0; when R is 1, D is 0 regardless of the state of S.

The noun in the utility model explains:

an automatic protection system is a system which triggers certain conditions when a certain parameter or a plurality of parameters reach a specified value or when a certain device is started or stopped, and the system does not need to be artificially confirmed and can automatically control the device to act.

Linkage means that another device is linked or locked after a protective action.

The FSTOUT module refers to a functional module that can confirm an input signal according to a specified logic and then give an output signal, and can be used in various device controls, such as, but not limited to, an XDPS800+ system.

The RSFLP module refers to a logic trigger selected from any existing RSFLP module and used for automatically putting into protection of a generator breaker in a normal state.

The HLALM module refers to an alarm output module and is selected from any existing HLALM module.

In addition, a generator circuit breaker, a thrust pad of the steam turbine, front and rear bearings of the steam turbine, and a quick closing valve of the steam turbine are indispensable components in the steam turbine of the power plant. ETS (trip protection) and AST (emergency shutdown protection) of the steam turbine are also indispensable conventional settings of the steam turbine system of the power plant. AST is realized through the AST solenoid valve, equally the utility model discloses in, the thrust tile piece of generator circuit breaker, merit hot steam turbine, the front and back bearing of merit hot steam turbine, the quick closing valve of merit hot steam turbine, ETS and AST are the conventional setting that is indispensable in the merit hot steam turbine. The AST oil pressure referred to in the present invention refers to the oil pressure of the AST solenoid valve.

The above description in this specification is merely illustrative of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A power heating system utilizing low-pressure steam of a heat supply network is characterized by comprising a left side steam extraction pipe, a right side steam extraction pipe, a power heating steam turbine set, a power heating steam turbine heater and a heat supply network circulating pump heater;

2. The system according to claim 1, wherein a plurality of steam pumps are provided in parallel in the steam drain line on the steam drain side of each of the steam turbine heaters.

3. The system of claim 1, wherein a plurality of drain pumps are disposed in parallel in the drain line on the drain side of each of the heat supply network circulation pump heaters.

4. An automatic protection action system of a power and heat system is characterized by comprising two groups of power and heat turbine units, wherein the two groups of power and heat turbine units are respectively communicated with a left steam extraction pipe and a right steam extraction pipe; the system comprises a power and heat turbine, and is characterized by further comprising a front end measuring system and a DCS function module, wherein the front end measuring system and the DCS function module are used for measuring parameters of the power and heat turbine, the DCS function module comprises FSTOUT modules, the number of the FSTOUT modules and the number of the front end measuring system are consistent with that of the power and heat turbine and are in one-to-one correspondence, each FSTOUT module is connected between the corresponding front end measuring system and the corresponding power and heat turbine, and is used for controlling the corresponding power and heat turbine to be in emergency shutdown through internal operation after receiving signals measured by the corresponding front end measuring system, wherein each FSTOUT module comprises a plurality of groups of terminals, and each group of terminals respectively complete protection actions on the power and heat turbine.

5. The automatic protection action system of the power and heat system as claimed in claim 4, wherein when the two fast-closing valves of the power and heat turbine are fully opened, a pulse of 5 seconds is generated to reset the FSTOUT output signal, and the two fast-closing valve full-opening signals of the power and heat turbine are reset conditions of the FSTOUT module.

6. The automatic protection operation system of a power and heat system according to claim 4, wherein the DCS function module further comprises a plurality of TIMER modules connected between the front end measurement system and the FSTOUT module, and the plurality of TIMER modules are respectively connected to the input terminal Z1, the input terminal Z7, the input terminal Z10, the input terminal Z15 and the input terminal Z16 of the FSTOUT module, so as to delay the sending of the corresponding measurement signal of the front end measurement system or change the long signal into a pulse signal, so that the automatic protection operation system can issue a command within a reasonable time.

7. The automatic protection action system of a work and heat system of claim 4, wherein the DCS function module further comprises a plurality of QOR8 modules:

8. The automatic protection action system of the power and heat system according to claim 7, wherein the DCS function module further includes an HLALM module, the HLALM module is connected between the front end measurement system and the QOR8 module for receiving the power and heat turbine lubricant pressure signal, and the HLALM module receives the pressure transmitter measurement signal sent by the front end measurement system and outputs a signal when the lubricant pressure of the power and heat turbine is lower than 0.085 MPa.

9. The automatic protection action system of a power and heat system according to claim 4, wherein the DCS function module further comprises a D/MA module for realizing the manual shutdown of the DCS of the power and heat turbine, and the output end of the D/MA module is connected with the input terminal Z11 of the FSTOUT module.

10. The automatic protection action system of the power AND heat system according to claim 4, wherein an AND module AND a TIMER module are sequentially connected between the front-end measurement system AND a reset terminal R of the FSTOUT module, AND the TIMER module is operated by the FSTOUT module AND is used for resetting an output end of the FSTOUT module to ensure that an emergency stop signal can be reset AND disappear when the power AND heat turbine needs to be started.