An electric oil gas combined heat and power system and control method

Abstract

This invention discloses a combined electric, oil, and steam power system and its control method. The combined electric, oil, and steam power system includes: a gas turbine generator set, a combined oil and steam power waste heat boiler, a natural gas thermal oil boiler, a waste heat steam generator, and a softened water supply system. The gas turbine generator set is connected to the combined oil and steam power waste heat boiler, which uses the flue gas generated by the gas turbine generator set to heat the thermal oil. The natural gas thermal oil boiler is also connected to the combined oil and steam power waste heat boiler, and is used to heat the thermal oil flowing out of the combined oil and steam power waste heat boiler. The waste heat steam generator is connected to the softened water supply system, and is used to generate steam from the flue gas. This system allows for the organic integration of its subsystems and fully considers system scalability. It adopts standardization, structure, and modularization to ensure the openness, scalability, maintainability, reliability, and economy of the combined electric, oil, and steam power control system.

Description

Technical Field

[0001] This invention relates to the field of control system design, and more specifically to a combined electric, oil, and gas power supply system and its control method. Background Technology

[0002] The chemical fiber industry is a high-energy- and high-water-consumption industry. To achieve sustainable development, this industry must move towards a low-carbon and green development path. The energy demands of chemical fiber enterprises are characterized by stable, large-volume, and relatively small-fluctuation demands for electricity and heat (steam and thermal oil). To address the challenges and energy characteristics of the chemical fiber industry, a combined electricity, thermal oil, and steam (CCHP) system can be applied to solve the energy supply problem. For example, considering the high exhaust temperature of gas turbines, there is the possibility of cascaded utilization in production, i.e., producing thermal oil from the high-grade section of the flue gas and steam from the low-grade section, forming a CCHP system of electricity, thermal oil, and steam. However, relying solely on the control systems built into the power generation equipment or heat exchanger equipment limits control to individual devices, resulting in single-function systems lacking the ability to optimize and control the entire system. This leads to low system efficiency, poor economic performance, difficulty in achieving the expected project benefits, and low automation.

[0003] Therefore, providing a combined electric, oil, and gas power system and its control method that can organically combine the various subsystems and fully consider the system's scalability is an urgent technical problem to be solved. Summary of the Invention

[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the aforementioned technical problems, the present invention provides a combined electric, oil, and steam power system, which includes: a gas turbine generator set, a combined oil and steam waste heat boiler, a natural gas thermal oil boiler, a waste heat steam generator, and a softened water supply system.

[0006] The gas turbine generator set is connected to the combined oil and gas waste heat boiler, and the combined oil and gas waste heat boiler uses the flue gas generated by the gas turbine generator set to heat the heat transfer oil.

[0007] The natural gas thermal oil boiler is connected to the combined oil and gas waste heat boiler, and the natural gas thermal oil boiler is used to heat the thermal oil flowing out of the combined oil and gas waste heat boiler;

[0008] The waste heat steam generator is connected to the softened water supply system, and the waste heat steam generator is used to generate steam from the flue gas.

[0009] This invention also discloses a control method for a combined electric, oil, and gas power supply system. This control method is used in a combined electric, oil, and gas power supply system as described above, and includes:

[0010] The analog quantities of the control equipment include the following steps: control of the water level and pressure of the waste heat steam generator, control of the water level and pressure of the deaerator, and control of the water level and pressure of the high-pressure steam generator.

[0011] Sequential control and interlocking protection, the steps of which include: generator start-up sequential control, heat transfer oil heat exchanger oil valve interlocking, heat transfer oil heat exchanger outlet flue gas temperature protection, waste heat steam generator pressure interlocking, waste heat steam generator water level interlocking, and high-pressure steam generator water level interlocking.

[0012] Switch between the heat transfer oil supply system and the steam supply system.

[0013] This control method for a combined electric, oil, and gas power system enables the organic integration of various subsystems and fully considers the system's scalability. It adopts standardization, structuring, and modularization to ensure the openness, scalability, maintainability, reliability, and economy of the combined electric, oil, and gas power system. It fully embodies the development concept of modern industrial equipment control, which features decentralized control and centralized information management.

[0014] Specific embodiments of the invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Within the spirit and scope of the appended claims, embodiments of the invention include many changes, modifications, and equivalents.

[0015] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0016] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the combined electric, oil, and gas power supply system provided for an embodiment of the present invention;

[0019] Figure 2 Strategy logic diagram of the control method for a combined electric, oil, and gas power supply system provided in the embodiments of the present invention;

[0020] Figure 3 A heat transfer oil sequential control logic diagram for a combined electric, oil, and gas power supply system control method provided in an embodiment of the present invention;

[0021] Figure 4 A sequential control logic diagram for starting the generator set in the control method of the combined electric, oil, and gas power supply system provided in the embodiments of the present invention;

[0022] Figure 5 A control logic diagram for generator set shutdown provided in an embodiment of the present invention. Detailed Implementation

[0023] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope defined by the appended claims.

[0024] Unless otherwise defined in the specification, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] To at least partially solve the above problems, according to a first aspect of the present invention, referring to Figure 1 As shown, a combined heat and power (CHP) system is provided. This system can consist of a gas turbine generator set, a combined heat and power waste heat boiler (comprising a thermal oil heat exchanger, a low-pressure evaporator, a deaerator, an economizer, a high-pressure steam generator, and auxiliary equipment), a natural gas thermal oil boiler, a softened water supply system, and other auxiliary equipment. The components are connected by pipelines, such as oil pipes, flue gas pipes, or water pipes, with the choice of pipe depending on the properties of the flowing medium between components. The gas turbine generator set generates electricity using natural gas and produces high-temperature exhaust gas. The combined heat and power waste heat boiler uses the exhaust gas from the gas turbine generator set to heat the thermal oil and water to produce steam. The natural gas thermal oil boiler further heats the thermal oil after it has been heated in the combined heat and power waste heat boiler. The softened water supply system supplies soft water for steam generation.

[0026] Gas turbine generator sets can generate electricity by burning natural gas. The electricity for users is supplied by the gas turbine generator set, with the grid power serving as a supplement and guarantee. When the electricity demand is less than 75% of the gas turbine generator set's supply capacity, the gas turbine generator set is shut down, and all user electricity needs are met by the grid. When the demand exceeds 75% of the supply capacity, the gas turbine load tracks the user's electricity consumption, maintaining a "grid-connected but not grid-connected" operation mode.

[0027] The flow rate of the user's thermal oil is basically constant. The heating capacity of the thermal oil heat exchanger is less than the user's demand. The supply oil temperature is maintained at 320℃ by adjusting the natural gas thermal oil boiler. The user's thermal oil system maintains the return oil temperature at 298℃ by adjusting the return oil valve. The thermal oil heat exchanger and the natural gas thermal oil boiler are connected in series, and waste heat is used to heat the thermal oil.

[0028] 1) First operating scenario

[0029] When the oil-gas waste heat boiler is not in operation, the return oil from the user's production equipment passes through the circulating oil pump and enters the natural gas thermal oil furnace via oil line A to be heated to meet the user's thermal oil needs.

[0030] 2) Second operating scenario

[0031] When the oil-gas waste heat boiler is running, the return oil from the user's production equipment goes to the oil station and then passes through the circulating oil pump and enters the return oil header of the waste heat heat transfer oil furnace through oil circuit B. At the same time, the return oil from the evaporator heat transfer oil circulation circuit C and the heat transfer oil from oil circuit B are mixed and enter the return oil header of the waste heat heat transfer oil, so that the oil flow rate in the waste heat heat transfer oil furnace is constant.

[0032] The steam supply system is used to supply steam. User steam demand is divided into saturated steam at 0.6 MPa and 2.0 MPa, with rated flow rates of 3.8 t / h and 1.2 t / h respectively. The low-pressure steam demand ranges from 3.04 t / h to 5.2 t / h.

[0033] 1) Low-pressure steam

[0034] The waste heat steam generator has a relatively constant steam output capacity of 2.78 tons / hour (6 kg / kg), which cannot meet the user's demand for low-pressure steam. The system is equipped with a pressure-reducing steam supply system, which supplements the shortfall with 2.0 MPa high-pressure steam through pressure reduction, with a supplementary amount of 0.26 to 2.42 tons / hour. Pressure sensors are installed on the low-pressure steam pipeline, and the signal output of the pressure sensor is sent to the control system. The control system controls the pressure-reducing valve group based on this signal to maintain the low-pressure steam pressure at a given level to meet the user's steam demand of 3.04 to 5.2 tons / hour.

[0035] 2) High-pressure steam

[0036] High-pressure steam is provided by a high-pressure steam generator, which, in addition to meeting the high-pressure steam demand, also needs to provide low-pressure steam as a supplement. A pressure sensor is installed on the high-pressure steam pipe, and the sensor's information is output to the control system. Based on this signal, the control system controls the opening of the evaporator's oil supply bypass valve, thereby changing the amount of heat transfer oil entering the high-pressure steam generator and thus regulating the evaporator's steam production.

[0037] (4) Water supply system

[0038] Softened water, used as a steam production source, requires multiple treatments to meet steam production standards. A water supply system supplies the softened water. This system can be a softened water station (WZ302), which supplies softened water to the economizer (JN605), where it is heated by low-temperature flue gas before entering the deaerator (CY604). The makeup water is further heated by steam to reach saturation temperature, removing dissolved oxygen and other gases to prevent and reduce corrosion of boiler feedwater pipes and other auxiliary equipment. The heated and deaerated softened water then enters the high-temperature and waste heat steam generators to produce steam.

[0039] for Figure 1 , Figure 1 The equipment listed is as follows: natural gas thermal oil boiler QG501, gas turbine generator set RJ401, thermal oil heat exchanger RG601, low-pressure steam heat exchanger TG602, steam generator RT603, deaerator CY604, energy saver JN605, oil station YZ301, soft water station WZ302, power grid DW303, bypass valve VS2001 on circuit A, electric switch valve VS2002 on the outlet oil circuit of the thermal oil heat exchanger, and on circuit D. The following valves are listed: VS2003 (regulating valve), VS2004 (feedwater regulating valve for low-pressure steam boiler), VS2005 (feedwater regulating valve for evaporator), VS2006 (steam regulating valve group on the pressure-reducing steam line), VS2007 (discharge valve on low-pressure steam distribution cylinder), VS2008 (discharge valve on high-pressure steam distribution cylinder), VS2009 (steam regulating valve for deaerator), LE101 (feedwater pump for deaerator), LE102 (feedwater pump for low-pressure steam generator), and LE103 (feedwater pump for evaporator).

[0040] This invention also discloses a control method for a combined electric, oil, and gas power supply system, which may include the following steps:

[0041] Control of water level and pressure in waste heat steam generator, control of water level and pressure in deaerator, and control of water level and pressure in high-pressure steam generator;

[0042] Sequential control and interlock protection: generator start-up sequential control, heat transfer oil heat exchanger oil valve interlock, heat transfer oil heat exchanger outlet flue gas temperature protection, waste heat steam generator pressure interlock, waste heat steam generator water level interlock, high pressure steam generator water level interlock.

[0043] The method for seamless switching between the heat transfer oil supply system and the steam supply system: In order to achieve seamless switching between the heat transfer oil supply system and the steam supply system, cascade control, internal circulation diversion control and sequential control interlock are adopted.

[0044] (1) Waste heat steam generator drum water level control

[0045] By adjusting the opening of the low-pressure feedwater regulating valve, the feedwater flow rate is changed to adapt to changes in low-pressure steam flow and stabilize the steam drum water level within the normal range.

[0046] (2) Low-pressure steam header pressure control

[0047] By adjusting the opening of the pressure reducing valve assembly, the flow rate of high-pressure steam to low-pressure steam is changed to adapt to changes in the external low-pressure steam load and maintain stable low-pressure steam header pressure.

[0048] (3) Deaerator water level control

[0049] By adjusting the speed of the soft water pump, the flow rate of the soft water supply is changed, and the water level in the deaerator is kept stable.

[0050] (4) Deaerator pressure control

[0051] By adjusting the opening of the deaerator heating steam regulating valve, the flow rate of heating steam is changed, and the pressure of the deaerator is kept stable.

[0052] (5) Pressure control of high-pressure steam generator

[0053] By adjusting the opening of the oil circulation bypass valve of the high-pressure steam generator, the amount of heat transfer oil entering the injector is changed, the heating intensity is adjusted, and the pressure of the high-pressure steam generator is maintained stably.

[0054] (6) High-pressure steam generator water level control

[0055] By adjusting the opening of the high-pressure feedwater regulating valve, the feedwater flow rate is changed to adapt to changes in the high-pressure steam flow rate and stabilize the water level of the high-pressure steam generator within the normal range.

[0056] The steps of the sequential control and interlocking protection also include:

[0057] (1) Generator start-up sequence control: The bypass valve of the heat transfer oil heat exchanger is closed, the isolation valve of the heat transfer oil heat exchanger is open, the circulating oil pump is started, and the gas turbine generator set is allowed to start.

[0058] (2) Interlock of oil valves of heat transfer oil heat exchanger: The bypass valve of heat transfer oil heat exchanger is open and the isolation valve of heat transfer oil heat exchanger is allowed to close; The isolation valve of heat transfer oil heat exchanger is open and the bypass valve of heat transfer oil heat exchanger is allowed to close.

[0059] (3) Heat transfer oil heat exchanger outlet flue gas temperature protection: If the heat transfer oil heat exchanger outlet flue gas temperature is high, the gas turbine generator set will trip. Close the heat transfer oil heat exchanger isolation valve and open the heat transfer oil heat exchanger bypass valve.

[0060] (4) Waste heat steam generator pressure interlock: The waste heat steam generator high pressure binary interlock opens the waste heat steam generator air exhaust valve; the waste heat steam generator high pressure single interlock closes the waste heat steam generator air exhaust valve.

[0061] (5) Waste heat steam generator water level interlock: The waste heat steam generator high water level binary interlock opens the emergency drain valve; the waste heat steam generator high water level single interlock closes the emergency drain valve.

[0062] (6) High pressure steam generator water level interlock: High pressure steam generator water level binary interlock opens the emergency drain valve; High pressure steam generator water level single interlock closes the emergency drain valve.

[0063] The method for seamless switching between the heat transfer oil supply system and the steam supply system is characterized by further comprising:

[0064] (1) Since the maximum heating capacity of the thermal oil heat exchanger only accounts for half of the user's heat demand, in order to simplify system operation and improve system stability, the thermal oil heat exchanger and the natural gas thermal oil boiler adopt a cascade control method. The thermal oil heat exchanger does not have temperature control, and the oil supply temperature control is the responsibility of the downstream natural gas thermal oil boiler.

[0065] (2) The high-pressure steam generator adopts an internal circulation diversion control method for heat extraction. When adjusting the steam load, the heat transfer oil circulation flow rate fluctuates very little, thereby ensuring the stability of the hot oil circulation flow rate of the heat transfer oil heat exchanger.

[0066] (3) A sequential control interlock is set between the oil circulation isolation valve and the bypass valve of the heat transfer oil heat exchanger to prevent fluctuations in oil circulation volume caused by operational errors. That is, the bypass valve can only be closed after the isolation valve is fully open, and the isolation valve can only be closed after the bypass valve is fully open, so as to ensure the stability of the main oil circulation volume and reduce system interference.

[0067] (4) The combined electric, oil and gas power supply system adopts the sliding parameter start-up mode, that is, first fully open the hot oil bypass valve of the high pressure steam generator and the hot oil circulation pump, then open the oil circulation isolation valve of the heat transfer oil heat exchanger and close the oil circulation bypass valve to establish the oil circulation of the heat transfer oil heat exchanger, and then allow the gas turbine to be started.

[0068] (5) When the gas turbine is shut down, the oil circulation bypass valve is allowed to be opened only when the flue gas temperature of the heat transfer oil heat exchanger drops to the set value, and then the oil circulation isolation valve is closed. The high-pressure steam generator is shut down slowly according to the load of the natural gas steam boiler. This sequential control method can ensure that the hot oil temperature changes slowly and smoothly, and ensure the stability of the control of the natural gas heat transfer oil boiler.

[0069] To achieve seamless switching between the heat transfer oil supply system and the steam supply system, cascade control, internal circulation diversion control, and sequential control interlocking are employed, as detailed below.

[0070] (1) Since the maximum heating capacity of the thermal oil heat exchanger only accounts for half of the user's heat demand, in order to simplify system operation and improve system stability, the thermal oil heat exchanger and the natural gas thermal oil boiler adopt a cascade control method. The thermal oil heat exchanger does not have temperature control, and the oil supply temperature control is the responsibility of the downstream natural gas thermal oil boiler.

[0071] (2) The high-pressure steam generator adopts an internal circulation diversion control method for heat extraction. When adjusting the steam load, the heat transfer oil circulation flow rate fluctuates very little, thereby ensuring the stability of the hot oil circulation flow rate of the heat transfer oil heat exchanger.

[0072] (3) Figure 3 The schematic diagram of the sequential control logic of the heat transfer oil shows that the oil circulation isolation valve and the bypass valve of the heat transfer oil heat exchanger are sequentially interlocked to prevent fluctuations in oil circulation volume caused by operational errors. That is, the bypass valve can only be closed after the isolation valve is fully open, and the isolation valve can only be closed after the bypass valve is fully open, so as to ensure the stability of the oil circulation volume of the main heat transfer oil circuit and reduce system interference.

[0073] (4) Figure 4 The diagram illustrates the logic of the sequential control of the generator set startup. It adopts a sliding parameter startup method, which means that the hot oil bypass valve of the high-pressure steam generator and the hot oil circulation pump are fully opened first, then the oil circulation isolation valve of the heat transfer oil heat exchanger is opened and the oil circulation bypass valve is closed to establish the oil circulation of the heat transfer oil heat exchanger, and then the gas turbine is allowed to start.

[0074] (5) Figure 5 The diagram illustrates the sequential control logic when the gas turbine is shut down. The oil circulation bypass valve is only allowed to open when the flue gas temperature of the thermal oil heat exchanger drops to the set value, and then the oil circulation isolation valve is closed. The high-pressure steam generator is shut down slowly according to the load of the natural gas steam boiler. This sequential control method can ensure that the temperature of the hot oil changes slowly and gradually, thus ensuring the stability of the control of the natural gas thermal oil boiler.

[0075] The invention achieves organic integration of various subsystems and fully considers system scalability, adopting standardized, structured, and modular design principles to ensure the openness, scalability, maintainability, reliability, and economy of the combined electric, oil, and gas power supply control system. The invention has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the invention to the described embodiments. Furthermore, those skilled in the art will understand that the invention is not limited to the above embodiments, and many variations and modifications can be made based on the teachings of the invention, all of which fall within the scope of protection claimed by the invention. The scope of protection of the invention is defined by the appended claims and their equivalents.

Claims

1. A combined electric, oil, and gas power supply system, characterized in that, The combined power, oil, and gas system includes: a gas turbine generator set, a combined oil and gas waste heat boiler, a natural gas thermal oil boiler, and a softened water supply system. The gas turbine generator set is connected to the combined oil and gas waste heat boiler, and the combined oil and gas waste heat boiler uses the flue gas generated by the gas turbine generator set to heat the heat transfer oil. The natural gas thermal oil boiler is connected to the combined oil and gas waste heat boiler. The natural gas thermal oil boiler is used to heat the thermal oil flowing out of the combined oil and gas waste heat boiler, and the heated thermal oil is supplied to users. The waste heat steam generator is connected to the softened water supply system and is used to generate steam from the flue gas. The combined oil and steam waste heat boiler includes a thermal oil heat exchanger, a waste heat steam generator, a deaerator, an economizer, and a high-pressure steam generator. The combined oil, steam, and electricity system also includes a thermal oil supply system for supplying thermal oil to the combined oil, steam, and electricity system. A sequential interlock is provided between the oil circulation isolation valve and the bypass valve of the thermal oil heat exchanger. The bypass valve is located between the circulating oil pump and the natural gas thermal oil boiler and is connected in parallel with the thermal oil heat exchanger. The circulating oil pump is located on the return oil pipeline connected to the user. The flue gas generated by the gas turbine generator set passes sequentially through the heat transfer oil heat exchanger, the waste heat steam generator, and the energy-saving device. The heat transfer oil heat exchanger is connected to the high-pressure steam generator. The combined electric, oil, and gas power supply system includes sequential control and interlocking protection. The steps of the sequential control and interlocking protection include: Generator start-up sequence control: The bypass valve of the heat transfer oil heat exchanger is closed, the oil circulation isolation valve of the heat transfer oil heat exchanger is open, the circulating oil pump is started, and the gas turbine generator set is allowed to start. Interlock of oil valves in heat transfer oil heat exchanger: When the bypass valve of the heat transfer oil heat exchanger is open, the isolation valve of the heat transfer oil heat exchanger is allowed to close; when the isolation valve of the heat transfer oil heat exchanger is open, the bypass valve of the heat transfer oil heat exchanger is allowed to close.

2. The combined electric, oil, and gas power supply system according to claim 1, characterized in that, It also includes a power supply system for supplying power in combination with the gas turbine generator set.

3. A control method for a combined electric, oil, and gas power system, characterized in that, This control method is used in a combined electric, oil, and gas power system as described in claim 1 or 2, and the control method includes: The analog quantities of the control equipment include the following steps: control of the water level and pressure of the waste heat steam generator, control of the water level and pressure of the deaerator, and control of the water level and pressure of the high-pressure steam generator. Sequential control and interlocking protection, the steps of which further include: heat transfer oil heat exchanger outlet flue gas temperature protection, waste heat steam generator pressure interlock, waste heat steam generator water level interlock, and high pressure steam generator water level interlock. Switch between the heat transfer oil supply system and the steam supply system.

4. The control method for a combined electric, oil, and gas power supply system according to claim 3, characterized in that, The steps for controlling the analog quantity of the control device include: Waste heat steam generator drum water level control, the steps of which are: by adjusting the opening of the low-pressure feedwater regulating valve, the feedwater flow rate is changed to adapt to the changes in low-pressure steam flow rate and stabilize the drum water level within the normal range; The low-pressure steam header pressure control includes the following steps: adjusting the opening of the pressure reducing valve group to change the flow rate from high-pressure steam to low-pressure steam, so as to adapt to changes in the external low-pressure steam load and maintain stable low-pressure steam header pressure. Deaerator water level control: By adjusting the speed of the soft water pump, the flow rate of the soft water supply is changed to maintain a stable water level in the deaerator; Deaerator pressure control: By adjusting the opening of the deaerator heating steam regulating valve, the flow rate of heating steam is changed to maintain stable deaerator pressure; Pressure control of the high-pressure steam generator: By adjusting the opening of the oil circulation bypass valve of the high-pressure steam generator, the amount of heat transfer oil entering the high-pressure steam generator is changed, the heating intensity is adjusted, and the pressure of the high-pressure steam generator is kept stable. The high-pressure steam generator water level control is achieved by adjusting the opening of the high-pressure feedwater regulating valve to change the feedwater flow rate, thereby adapting to changes in the high-pressure steam flow rate and stabilizing the high-pressure steam generator water level within the normal range.

5. The control method for a combined electric, oil, and gas power supply system according to claim 3, characterized in that, The sequential control and interlocking protection steps also include: Heat transfer oil heat exchanger outlet flue gas temperature protection: If the heat transfer oil heat exchanger outlet flue gas temperature is high, the gas turbine generator set will trip. Close the heat transfer oil heat exchanger isolation valve and open the heat transfer oil heat exchanger bypass valve. Waste heat steam generator pressure interlock: High pressure binary interlock of waste heat steam generator opens the air vent valve of waste heat steam generator; high pressure single interlock of waste heat steam generator closes the air vent valve of waste heat steam generator. Waste heat steam generator water level interlock: High water level binary interlock opens the emergency drain valve; high water level single interlock closes the emergency drain valve. High-pressure steam generator water level interlock: High water level binary interlock opens the emergency drain valve; high water level single interlock closes the emergency drain valve.

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