JP4919766B2 - Heating temperature adjustment method, temperature control system - Google Patents

Description

  The present invention relates to a heating temperature adjustment method and a temperature control system. In particular, the present invention relates to a heating temperature adjustment method and a temperature control system related to temperature adjustment in a facility such as a power plant.

  2. Description of the Related Art Conventionally, facilities such as power plants have been obligated to keep exhaust gas at a temperature higher than a reference temperature and discharge it from a discharge port such as a chimney when exhausting smoke exhausted after predetermined processing. From the environmental point of view, by setting the exhaust gas to a predetermined temperature or higher, for example, there is an effect of diffusing the exhaust gas over a certain distance.

  Normally, in a facility such as a power plant, the gas discharged after the desulfurization device that removes sulfur from the gas performs processing becomes the final smoke. Here, since the desulfurization unit uses a large amount of water to desulfurize, the heat of the gas is taken away by water, especially when the load of power generation increases, in order to keep the temperature of the flue gas high. A lot of heating is required.

Therefore, conventionally, it is known to heat a gas that becomes flue gas with a steam gas heater (steam gas heater (SGH)) before discharging, and it is known to perform such heating efficiently. Yes. For example, in Patent Document 1, in a gas gas heater (GGH) system using a heat medium, heat is effectively recovered by recovering the heat amount of the heat drain of the heat medium heater or the heat medium tank for heating the GGH heat medium. A flue gas treatment apparatus that reduces the amount of steam supplied to a medium heater and improves the thermal efficiency of a power plant, and an operating method thereof are disclosed.
JP-A-11-99317

  However, although it is possible to improve the thermal efficiency of a power plant to some extent by using an apparatus such as Patent Document 1, it is desirable from the viewpoint of energy consumption that heating of the steam gas heater can be reduced as much as possible. That is, there is a demand for a method and system that can reduce the heating (heating steam) of the steam gas heater as much as possible while maintaining the temperature of the flue gas at a predetermined temperature.

  An object of this invention is to provide the method and system which can reduce heating as much as possible, hold | maintaining the temperature of the gas to discharge | emit at predetermined temperature.

  The present inventors can reduce the heating of the steam gas heater while maintaining the temperature of the flue gas at a predetermined temperature by adjusting the temperature setting of the temperature of the gas that becomes flue gas according to the load of the power generation amount. As a result, the present invention has been completed.

(1) A heating temperature adjustment method for adjusting the temperature of a steam gas heater for heating the exhaust gas in order to maintain the exhaust gas discharged from the chimney provided in the power plant at a predetermined temperature,
The load of the power generation amount of the power plant is measured, and the drop in the load of the power generation amount has been measured for a predetermined time, or the load of the power generation amount has been measured for a predetermined time to be approximately constant. A method for adjusting the heating temperature, wherein the temperature setting of the steam gas heater is lowered.

According to the invention of (1), in the heating temperature adjustment method for adjusting the temperature of the steam gas heater to be heated, the load of the power generation amount of the power plant is measured, and the drop in the load of the power generation amount is measured for a predetermined time. Alternatively, the temperature setting of the steam gas heater is lowered in response to the fact that the load of the power generation amount is substantially constant for a predetermined time.
Therefore, the temperature setting of the steam gas heater is adjusted according to the load of the power generation amount while maintaining the temperature of the exhausted gas at a predetermined temperature. That is, by reducing the set temperature of the steam gas heater when the load of the power generation amount decreases or when the load is substantially constant and stable, excessive heating of the steam gas heater can be avoided and the steam heated by the steam gas heater can be reduced. Is possible.
As a result, it is possible to reduce the heating energy for maintaining the reference value while maintaining the temperature of the gas to be exhausted at the reference value.

(2) a heating temperature control method according to (1), a method of adjusting the temperature of the steam gas heater is heated, characterized in that applied to the desulfurization apparatus installed on flow of the chimney Temperature adjustment method.

  According to invention of (2), the heating temperature adjustment method as described in (1) provides the method applied to the desulfurization apparatus of a power plant. Therefore, it is possible to efficiently heat the steam gas heater by applying the above heating temperature adjustment method to the flue gas discharged from the desulfurization device of the power plant.

(3) In the heating temperature adjustment method according to (1) or (2),
In response to a drop in the load of the power generation amount or a measurement for a predetermined time that the load of the power generation amount is substantially constant, the temperature setting of the steam gas heater is set to 1.0 degree or more from the predetermined value to 2.0 degrees or more. A heating temperature adjusting method, wherein the heating temperature is lowered within a range of less than or equal to a degree.

According to the invention of (3), in the heating temperature adjustment method according to (1) or (2), it is determined that the load drop of the power generation amount or the load of the power generation amount is substantially constant for a predetermined time. In response to the measurement, the temperature setting of the steam gas heater is lowered within a range of 1.0 degree to 2.0 degree from a predetermined value.
Therefore, as in (1), when the load of the power generation amount is reduced or when the load is substantially constant and stable, the set temperature of the steam gas heater is lowered in the range of 1.0 degree to 2.0 degrees, It is possible to avoid excessive heating of the steam gas heater and reduce the heating steam from the steam gas heater.

(4) In the heating temperature adjustment method according to any one of (1) to (3),
The steam gas heater is configured to heat the exhaust gas after being heated by a plurality of gas gas heaters.

According to the invention of (4), in the heating temperature adjustment method according to any one of (1) to (3), the steam gas heater performs heating after being heated by a plurality of gas gas heaters.
Accordingly, the same operations and effects as those of (1) to (3) are obtained, and the heating of the steam gas heater is performed after being heated by the plurality of gas gas heaters, so that the heating of the steam gas heater can be further reduced. It is.
As a result, it is possible to further reduce the heating steam amount by reducing the heating of the steam gas heater than the invention of (1).

(5) A temperature control system that additionally heats the exhaust gas with a steam gas heater after heating with a plurality of gas gas heaters in order to maintain the gas discharged from the chimney provided in the power plant at a predetermined temperature,
The load of the power generation amount of the power plant is measured, and it is detected that a drop in the load of the power generation amount has been measured for a predetermined time or that the power generation amount has been measured for a predetermined time. Detection means;
A signal to lower the set temperature for additional heating is sent to the steam gas heater on the condition that the detection means detects that the load of the power generation amount has dropped or that the load is substantially constant for a predetermined time. Temperature control communication means for
The steam gas heater is a temperature control system that performs heating at a set temperature corresponding to the signal in response to receiving a signal for lowering the set temperature from the temperature control communication unit.

According to the invention of (5), the temperature control system measures the load of the power generation amount of the power plant, and the drop in the load of the power generation amount is measured for a predetermined time or is a substantially constant load. Is detected for a predetermined time, and the detection means detects a decrease in the load of the power generation amount or a substantially constant load for a predetermined time for the steam gas heater. Then, a signal for lowering the set temperature for additional heating is transmitted, and the steam gas heater performs heating at the set temperature corresponding to the signal in response to receiving the signal.
Therefore, the temperature setting of the steam gas heater is adjusted according to the load of the power generation amount while maintaining the temperature of the exhausted gas at a predetermined temperature. That is, by reducing the set temperature of the steam gas heater when the load of the power generation amount decreases or when the load is substantially constant and stable, excessive heating of the steam gas heater can be avoided and the steam heated by the steam gas heater can be reduced. Is possible.
Further, since the steam gas heater is heated after being heated by the plurality of gas gas heaters, the heating of the steam gas heater can be further reduced.
As a result, it is possible to reduce the heating energy for maintaining the reference value while maintaining the temperature of the gas to be exhausted at the reference value.

(6) In the temperature control system according to (5), the temperature control system for adjusting the temperature of the steam gas heater, the temperature control system applied to the desulfurizer installed on flow of the chimney.

  According to invention of (6), the temperature control system as described in (5) provides the temperature control system applied to the desulfurization apparatus of a power plant. Therefore, it is possible to efficiently heat the steam gas heater by applying the above temperature control system to the flue gas discharged from the desulfurization device of the power plant.

(7) The temperature control system according to (5) or (6),
Display means for displaying the load of the power generation amount;
Input means for receiving an input of the set temperature,
The temperature control system in which the detection means determines the set temperature in accordance with an input from the input means and transmits a signal related to the determined set temperature to the steam gas heater.

According to the invention of (7), in the temperature control system according to (5) or (6), the load of the power generation amount is displayed, the input of the set temperature is received, and the detection means responds to the input of the input means. Then, the set temperature is determined, and a signal related to the determined set temperature is transmitted to the steam gas heater.
Therefore, the load of the power generation amount is displayed on the display means, and the input means accepts the input of the set temperature of the steam gas heater from the administrator or the like, so the administrator can adjust the set temperature while visually checking the load of the power generation amount. It becomes possible to do.

(8) The temperature control system according to (5) or (6),
Comprising storage means for preliminarily storing data in which the load of the power generation amount is associated with the set temperature;
The temperature control system, wherein the detection unit determines the set temperature based on data stored in the storage unit, and transmits a signal related to the determined set temperature to the steam gas heater.

According to the invention of (8), in the temperature control system according to (5) or (6), data in which the load of the power generation amount is associated with the set temperature is stored in advance, The set temperature is determined based on the data stored in the storage means, and a signal related to the determined set temperature is transmitted to the steam gas heater.
Therefore, it is possible for the temperature control system to adjust the set temperature of the steam gas heater by determining the set temperature based on data in which the power generation amount stored in advance is associated with the set temperature.

(9) The temperature control system according to any one of (5) to (8),
The temperature setting of the steam gas heater is set to 1.0 degree from the predetermined value in response to the measurement of the decrease in the load of the power generation amount or the load of the power generation amount being substantially constant for a predetermined time. A temperature control system, wherein the temperature is lowered within a range of 2.0 degrees or less.

According to the invention of (9), in the temperature control system according to (5) to (8), it is predetermined that the load drop of the power generation amount or the load of the power generation amount is substantially constant. The temperature setting of the steam gas heater is lowered within a range of 1.0 degree to 2.0 degree from a predetermined value according to the time and the measured value.
Therefore, as in (5), when the load of the power generation amount decreases or when the load is substantially constant and stable, the set temperature of the steam gas heater is decreased within the range of 1.0 degree or more and 2.0 degrees or less, It is possible to avoid excessive heating of the steam gas heater and reduce the heating steam from the steam gas heater.

  According to the present invention, it is possible to reduce the heating for maintaining the reference value as compared with the prior art while maintaining the temperature of the gas to be smoked at the reference value.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a desulfurization apparatus installed in a power plant. In a thermal power plant that generates power using coal, coal powder is burned in a boiler to make water into high-temperature and high-pressure steam, and the turbine is rotated by the power of the steam to generate power. The exhaust gas generated by power generation needs to be discharged to the atmosphere after performing a predetermined treatment. For this reason, a denitration device that removes nitrogen oxides (NO _x ) from exhaust gas from the boiler, an electric dust collector and a desulfurization device that remove soot in the exhaust gas are provided. The desulfurizer is usually placed after the electrostatic precipitator.

The desulfurization apparatus uses a wet desulfurization method in which limestone slurry and exhaust gas are contacted to react with sulfur oxide (SO _x ) from the exhaust gas and recovered as gypsum (CaSO ₄ .2H ₂ O). Remove. As shown in FIG. 1, the desulfurization apparatus 100 includes a main body 130 having an inlet pipe 140 at a lower portion and an outlet pipe 150 at an upper portion, and a slurry tank 120 connected to the main body 130.

Inside the main body 130, shower tubes 131 are arranged in multiple stages. The multi-stage shower tube 131 is connected so that the limestone slurry flows mutually. The slurry tank 120 stores a limestone slurry 121 in which limestone (CaCO ₃ ) is dispersed in water. The main body 130 and the slurry tank 120 are connected by a connecting pipe 160, and the connecting pipe 160 is connected to the shower pipe 131 in the main body 130.

The connecting pipe 160 is provided with a pump 161, and when the pump 161 is driven, the limestone slurry is supplied from the slurry tank 120 to the shower pipe 131 and sprayed from the shower pipe 131 to the exhaust gas G. As will be described later, the exhaust gas G is absorbed in the inlet pipe 140 (heat recovery), then introduced into the main body 130, reacts, exits the outlet pipe 150, reaches the chimney, and is discharged to the atmosphere as smoke. The Since calcium sulfite (CaSO ₃ ) is generated by the reaction in the main body 130 and accumulates at the bottom of the main body 130, it is supplied to the connection pipe 160 by the pump 110 and reused. After reuse, it reacts with oxygen to form gypsum. Take out.

  In facilities such as power plants, when exhaust gas is discharged from a chimney to the atmosphere, it is obliged to set the temperature to a reference temperature (for example, 85 ° C.) or higher. For this reason, it is necessary to heat the exhaust gas that has passed through the desulfurization apparatus 100 before discharging it to the atmosphere.

  FIG. 2 is a view showing a heating structure in the desulfurization apparatus 100. A plurality of gas gas heater (GGH) heat recovery units 171, 172, 173, 174, and 175 are arranged on the upstream side of the desulfurization apparatus 100 in the inlet pipe 140. A plurality of GGH reheaters 181, 182, 183, 184, and 185 are disposed on the downstream side of the desulfurization apparatus 100 in the outlet pipe 150.

  The GGH heat recovery units 171, 172, 173, 174, and 175 and the GGH reheaters 181, 182, 183, 184, and 185 are connected to each other by “EX1” to “EX5” via a heat medium pipe 191. . Water is used as a heat medium for the GGH heat recovery units 171, 172, 173, 174, 175 and the GGH reheaters 181, 182, 183, 184, 185, and the GGH heat recovery unit 171 is circulated by circulating water. , 172, 173, 174, and 175, the heat is transferred to each GGH reheater 181, 182, 183, 184, and 185.

  The exhaust gas G that has passed through the desulfurization apparatus 100 is heated by a plurality of downstream GGH reheaters 181, 182, 183, 184, and 185. A steam gas heater (SGH) 300 is disposed downstream of the GGH reheaters 181, 182, 183, 184 and 185. The steam gas heater 300 is disposed on the rear side (downstream side) of the GGH reheaters 181, 182, 183, 184, and 185, and the exhaust gas that has passed through the GGH reheaters 181, 182, 183, 184, and 185 is converted into steam. Heat. That is, the steam gas heater 300 additionally heats the shortage of heating in the GGH reheaters 181, 182, 183, 184 and 185. The exhaust gas G becomes equal to or higher than a reference temperature (for example, 90 ° C.) by the heating of the steam gas heater 300 and is discharged at a reference temperature (85 ° C.) from the chimney for exhausting smoke.

  FIG. 3 shows a structure for heating the steam gas heater 300. Inside the steam gas heater 300, a heat transfer tube (not shown) is arranged, and steam from the steam supply tube 310 is supplied to the heat transfer tube. A thermometer 320 is disposed at the outlet of the steam gas heater 300, and the steam adjustment valve 330 is opened and closed based on the temperature detected by the thermometer 320. The steam heated in the steam gas heater 300 is recirculated from the SGH drain tank 340. In addition, the water that is drained from the steam is collected in the water supply tank 350.

  In the present invention, the load of the power generation amount of the power plant is measured, and the drop in the load of the power generation amount is measured for a predetermined time, or the load of the power generation amount is substantially constant for a predetermined time, In accordance with the measurement, control is performed so as to lower the temperature setting of the steam gas heater, that is, the outlet temperature of the steam gas heater. Hereinafter, the present invention will be described in more detail.

  First, the inventors' research has revealed that the power generation load at the power plant and the steam flow required by the steam gas heater 300 change in a certain pattern. 4 and 5 are graphs showing the relationship between the load and the steam flow rate of the steam gas heater 300. The horizontal axis represents time (1 o'clock to 24 o'clock), the left vertical axis represents the load of power generation, and the right vertical axis represents SGH vapor flow is plotted.

  FIG. 4 shows a case where the power generation amount is an intermediate load. In FIG. 4, the load at midnight is the lowest, the load increases from dawn, reaches the maximum in the daytime, and gradually decreases in the evening, whereas the SGH steam flow rate gradually increases at midnight. A constant pattern that increases to 2.5 tons at maximum, gradually decreases with time, reaches 0 after about 3 hours 30 minutes, and then gradually increases when the load decreases for about 3 hours. It changes with.

  FIG. 5 shows a case where the power generation amount is low. When the load increases, the SGH vapor flow rate decreases, but the SGH vapor flow rate changes in a pattern that does not become zero. According to the actual measurement result, the pattern of FIG. 5 requires an SGH vapor flow rate about 1.5 times that of the intermediate load of FIG.

  FIG. 6 shows the relationship between the average load and the SGH steam flow rate for each month. In the month when the load increases, the SGH steam flow rate is low, and in the month when the load decreases, the SGH steam flow rate is high.

  As shown in FIGS. 4 to 6, the SGH vapor flow rate decreases as the load increases, and the SGH vapor flow rate increases as the load decreases. Thus, the magnitude of the load is related to the magnitude of the SGH steam flow rate. In addition, since the chimney is connected to the outlet of the steam gas heater, it is clear that the temperature of the exhaust gas discharged from the chimney is related to the gas temperature at the outlet of the steam gas heater (hereinafter referred to as the outlet temperature).

  Furthermore, the outlet temperature of the steam gas heater is related to the SGH steam flow rate. FIG. 7 shows the result of calculating the outlet temperature of the steam gas heater when the load is stable based on the SGH steam flow rate. When the load is 500 MW, 25 MW, and 15 MW, the outlet temperature of the steam gas heater is 90 ° C. and 88 ° C., respectively. .34 ° C. and 82.8 ° C. Further, when the load is 500 MW and the load is stable, the SGH steam flow rate becomes zero. Thus, when the load is stable, the outlet temperature of the steam gas heater can be calculated based on the SGH steam flow rate. Therefore, the outlet temperature of the steam gas heater can be grasped by measuring the SGH steam flow rate.

  FIG. 8 shows the calculation result of the change in the SGH steam flow rate when the outlet temperature of the steam gas heater is lowered by 1 ° C. based on FIG. When the load is 500 MW, since the amount of gas is large in a short time until the heat storage in the GGH reheater is saturated, the effect of reducing the SGH steam flow rate is increased only by reducing the outlet temperature of the steam gas heater by 1 ° C.

  Control of the temperature setting (outlet temperature setting) of the steam gas heater according to the present invention is performed by adjusting the flow rate of steam supplied to the steam gas heater. FIG. 9 is a graph in the case where the steam flow rate is adjusted when the load of the power generation amount is measured to be substantially constant for a predetermined time. The load is approximately constant from about 4 am to 6 am and is stable. The measurement that the load is substantially constant can be easily performed on the generator side. When the load is measured to be substantially constant, the steam flow rate is reduced by about 23% as shown by curve K in order to lower the outlet temperature of the steam gas heater by 1.5 ° C. Thus, in the control for lowering the outlet temperature of the steam gas heater, the heating of the steam gas heater for maintaining the reference value can be reduced while the temperature of the exhaust gas is maintained at the reference value.

  In the present invention, similar control is performed when a drop in the load of the power generation amount is measured for a predetermined time. That is, when the drop in the load of the power generation amount is measured for a predetermined time, the load is reduced as compared with the case where the load is substantially constant, so that the heating of the steam gas heater for maintaining the reference value is reduced. It is possible to control the temperature setting.

  The above temperature setting of the steam gas heater is preferably lowered within a range of 1 degree (° C.) to 2 degrees (° C.) from a predetermined set temperature. Even if the temperature is reduced by less than 1 degree, it cannot be expected to greatly contribute to the reduction of the amount of steam to the steam gas heater. On the other hand, if the temperature is lowered by more than 2 degrees, the additional heating of the exhaust gas by the steam gas heater is not sufficient. This is because it becomes impossible to set the flue gas temperature from the temperature higher than the reference temperature. In addition, when there is no above problem, you may set temperature exceeding the range of 1 degree or more and 2 degrees or less.

  FIG. 10 is a block diagram showing a temperature control system according to the present invention. A generator 200, a generator information transmission terminal 210, a steam gas heater (SGH) 300, an SGH temperature controller 230, and a central controller 240 are provided, and these are connected by wire or wirelessly. The arrow shown in FIG. 10 is the signal transmission direction.

  Information relating to the generator 200 is input to the generator information transmission terminal 210. The information regarding the generator 200 includes the load of the power generation amount, the temperature of the boiler, the amount and temperature of the generated steam, the rotational speed of the turbine, and other information. The generator information transmission terminal 210 transmits the input information to the central controller 240.

  The central controller 240 performs various predetermined processes based on the transmitted information. In the present invention, the central controller 240 particularly measures the load of the power generation amount, and determines whether or not the load of the power generation amount is substantially constant and whether or not the load of the power generation amount has dropped. Further, the time when the load of the power generation amount is substantially constant or the time when the load of the power generation amount is lowered is measured. The central controller 240 is set with a determination value for the duration time when the load of the power generation amount is substantially constant or when the load of the power generation amount drops. This judgment value may be input by an administrator, or may be automatically selected by the central controller 240. Furthermore, the central controller 240 sets the heating temperature of the steam gas heater 300 to the SGH temperature controller 230.

  The central controller 240 measures the time during which the load of the power generation amount is substantially constant or the time during which the load of the power generation amount drops, and then compares these measured values with the determination value. As a result of the comparison, when the measured value exceeds the judgment value, a signal for adjusting the temperature of the steam gas heater 300 is output to the SGH temperature control unit 230.

  As shown in FIG. 2, the steam gas heater 300 is disposed downstream of the desulfurization apparatus 100 and behind the GGH reheaters 181 to 185, and performs additional heating of the exhaust gas that has passed through the desulfurization apparatus 100. .

  The SGH temperature control unit 230 controls the temperature (outlet temperature) of the steam gas heater 300. For this reason, the SGH temperature control unit 230 is set with a predetermined temperature as a threshold value for performing temperature control. This setting is performed by the central controller 240. The temperature control of the steam gas heater 300 is performed by adjusting the flow rate of steam supplied to the steam gas heater 300. The predetermined temperature is a temperature at which the temperature of exhaust gas discharged from the chimney can be maintained at a reference value while reducing the flow rate of steam supplied to the steam gas heater 300, that is, while lowering the temperature setting of the steam gas heater 300. It is.

  Next, a main processing routine executed by the central controller 240 will be described based on FIG. First, the central controller 240 sets the SGH temperature controller 230 to a predetermined temperature (step S01). The predetermined temperature may be set by an administrator input, or may be automatically set by the central controller 240.

  Next, the central controller 240 receives a signal related to the load of the power generation amount from the generator information transmission terminal 210 (step S02). Then, central controller 240 measures the load of the power generation amount from the received signal (step S03). As a result of the measurement, when the load of the power generation amount is substantially constant or when the load of the power generation amount drops, these durations are measured. If the measured time exceeds the set judgment value, the central controller 240 transmits a temperature adjustment signal to the SGH temperature control unit 230 (step S04). With this transmission, the SGH temperature control unit 230 adjusts the flow rate of steam supplied to the steam gas heater 300 so that the steam gas heater 300 reaches a predetermined temperature.

  In step S03, if the measured time is less than the determination value, the process returns to step S02 and waits for the reception of the load signal of the power generation amount from the generator information transmission terminal 210.

  According to the temperature control system, the central controller 240 monitors the load of the power generation amount, and when the load of the power generation amount is measured for a predetermined time or when the load drop of the power generation amount is measured for a predetermined time. Since the temperature setting of the steam gas heater 300 is lowered by controlling the SGH temperature control unit 230, it is possible to reduce the heating for maintaining the reference value while maintaining the exhaust gas temperature at the reference value. Become.

  FIG. 12 is an embodiment that further embodies the central controller 240 of FIG. 11. The central controller 240 includes a receiving unit 241, a detecting unit 242, a temperature control communication unit 243, and a transmitting unit 244. Note that although the transmission unit 244 is a broken line block, this indicates that the transmission unit 244 may be incorporated in the temperature control communication unit 243 or may be independent of the temperature control communication unit 243.

  The receiving unit 241 receives information such as the load of the power generation amount transmitted from the generator information transmitting terminal 210. Then, the received information is output to the detecting means 242.

  The detection unit 242 measures the load of the power generation amount based on the information from the reception unit 241. Then, as described in step S03 of FIG. 11, when measuring that the load of the power generation amount is a substantially constant load for a predetermined time or when measuring the drop in the load of the power generation amount for a predetermined time, Is detected.

  The temperature control communication unit 243 sends the steam gas heater 300 to the steam gas heater 300 when the detection unit 242 measures that the load of the power generation amount is a substantially constant load for a predetermined time or when the drop in the load of the power generation amount is measured for a predetermined time. A signal for lowering the set temperature during the additional heating is output to the SGH temperature control unit 230 via the transmission unit 244 or directly. Thereby, the flow rate of the steam supplied to the steam gas heater 300 can be reduced.

  FIG. 13 is a temperature control system according to another embodiment of the present invention. In FIG. 13, display means 251 and input means 252 are further provided in the embodiment of FIG.

  The display means 251 is a device that displays the load of the power generation amount, and may be a display such as a liquid crystal display, a printer, a monitor, or the like. The display unit 251 is connected to the receiving unit 241 and displays the information received by the receiving unit 241 visually. The input means 252 is a device for inputting a set temperature for the steam gas heater 300, and may be a keyboard, a mouse, or the like. The input unit 252 is connected to the detection unit 242 and outputs the input set temperature to the detection unit 242.

  The detecting unit 242 measures the load of the power generation amount based on the information from the reception unit 241 and measures the load of the power generation amount when the load of the power generation amount is measured for a predetermined time or when the load of the power generation amount is reduced. This is detected when a predetermined time is measured. When this detection is made, the detection means 242 determines the set temperature of the steam gas heater 300 according to the input from the input means 252. The determined set temperature is transmitted to the SGH temperature control unit 230 via the temperature control communication unit 243. As a result, the SGH temperature control unit 230 lowers the temperature so that the steam gas heater 300 becomes the set temperature, so that the steam flow supplied to the steam gas heater 300 can be reduced.

  FIG. 14 is a temperature control system according to still another embodiment of the present invention. In FIG. 14, a storage unit 253 is provided in the central controller 240 in contrast to the embodiment of FIG.

  The storage unit 253 receives the set temperature for the steam gas heater 300 from the input unit 252. Further, the storage unit 253 receives the load of the power generation amount from the receiving unit 241. And the memory | storage means 253 memorize | stores the load of the input electric power generation amount, and the data which matched preset temperature. That is, the set temperature of the steam gas heater 300 corresponding to the load of the power generation amount is stored.

  The data stored in the storage unit 253 is input to the detection unit 242. Then, the detection unit 242 measures the load of the power generation amount based on the data from the storage unit 253, and when the load of the power generation amount is measured for a predetermined time or when the load of the power generation amount decreases. When this is measured for a predetermined time, this is detected. When this detection is made, the detection means 242 determines the set temperature of the steam gas heater 300 based on the data in the storage means 253. Then, the determined set temperature is transmitted to the SGH temperature control unit 230 via the temperature control communication unit 243. As a result, the SGH temperature control unit 230 lowers the temperature so that the steam gas heater 300 becomes the set temperature, so that the steam flow supplied to the steam gas heater 300 can be reduced.

  The temperature setting of the steam gas heater in the above temperature control system is preferably lowered within a range from 1 degree (° C.) to 2 degrees (° C.) below a predetermined set temperature. Even if the temperature is lowered by less than 1 degree, it cannot be expected to greatly contribute to the reduction of the amount of steam to the steam gas heater. On the other hand, if the temperature is lowered by more than 2 degrees, the additional heating of the exhaust gas by the steam gas heater is not sufficient. This is because it becomes impossible to set the flue gas temperature from the temperature higher than the reference temperature. In addition, when there is no above problem, you may set temperature exceeding the range of 1 degree or more and 2 degrees or less.

  As mentioned above, although embodiment of this invention was described, it only showed the specific example and does not specifically limit this invention. Further, the effects described in the embodiments of the present invention only list the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to the effects described in the embodiments of the present invention.

It is a block diagram of a desulfurization apparatus. It is a figure which shows the heating structure in a desulfurization apparatus. It is a figure which shows the heating structure of a steam gas heater. It is a graph which shows the relationship between the load in intermediate load, and SGH vapor | steam flow volume. It is a graph which shows the relationship between the load in low load, and SGH vapor | steam flow volume. It is a graph which shows the relationship between monthly average electric power generation amount and monthly average SGH steam usage. It is a table | surface figure which shows the relationship between the exit temperature of a steam gas heater, and SGH steam flow rate. It is a table | surface figure which shows the result of having calculated the change of SGH vapor | steam flow volume at the time of reducing the exit | outlet temperature of a steam gas heater by 1 degreeC. It is a graph in the case where the steam flow rate is adjusted when the load of the power generation amount is measured to be substantially constant for a predetermined time. It is a block diagram which shows the temperature control system of embodiment of this invention. It is a flowchart of the main process routine which the central control apparatus of a temperature control system performs. It is a block diagram which shows the detail of the temperature control system of FIG. It is a block diagram which shows the temperature control system of another embodiment of this invention. It is a block diagram which shows the temperature control system of another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Desulfurization device 171,172,173,174,175 GGH heat recovery device 181,182,183,184,185 GGH reheater 200 Generator 210 Generator information transmission terminal 230 SGH temperature control part 240 Central control apparatus 242 Detection part 243 Temperature control communication means 251 Display means 252 Input means 253 Storage means 300 Steam gas heater

Claims (9)

A heating temperature adjustment method for adjusting the temperature of a steam gas heater for heating the exhaust gas in order to maintain the exhaust gas discharged from the chimney provided in the power plant at a predetermined temperature,
The load of the power generation amount of the power plant is measured, and the drop in the load of the power generation amount has been measured for a predetermined time, or the load of the power generation amount has been measured for a predetermined time to be approximately constant. A method for adjusting the heating temperature, wherein the temperature setting of the steam gas heater is lowered. A heating temperature control method according to claim 1, a method of adjusting the temperature of the steam gas heater, the heating temperature adjustment method characterized in that it is applied to the desulfurization apparatus installed on flow of the chimney . In the heating temperature adjustment method according to claim 1 or 2,
In response to a drop in the load of the power generation amount or a measurement for a predetermined time that the load of the power generation amount is substantially constant, the temperature setting of the steam gas heater is set to 1.0 degree or more from the predetermined value to 2.0 degrees or more. A heating temperature adjusting method, wherein the heating temperature is lowered within a range of less than or equal to a degree. In the heating temperature adjustment method in any one of Claims 1-3,
The steam gas heater is configured to heat the exhaust gas after being heated by a plurality of gas gas heaters. In order to maintain the exhaust gas discharged from the chimney provided in the power plant at a predetermined temperature, the temperature control system additionally heats the exhaust gas with a steam gas heater after heating with a plurality of gas gas heaters,
The load of the power generation amount of the power plant is measured, and it is detected that a drop in the load of the power generation amount has been measured for a predetermined time or that the power generation amount has been measured for a predetermined time. Detection means;
A signal to lower the set temperature for additional heating is sent to the steam gas heater on the condition that the detection means detects that the load of the power generation amount has dropped or that the load is substantially constant for a predetermined time. Temperature control communication means for
The steam gas heater is a temperature control system that performs heating at a set temperature corresponding to the signal in response to receiving a signal for lowering the set temperature from the temperature control communication unit. In the temperature control system of claim 5, the temperature control system for adjusting the temperature of the steam gas heater, the temperature control system applied to the desulfurizer installed on flow of the chimney. The temperature control system according to claim 5 or 6,
Display means for displaying the load of the power generation amount;
Input means for receiving an input of the set temperature,
The temperature control system in which the detection means determines the set temperature in accordance with an input from the input means and transmits a signal related to the determined set temperature to the steam gas heater. The temperature control system according to claim 5 or 6,
Comprising storage means for preliminarily storing data in which the load of the power generation amount is associated with the set temperature;
The temperature control system, wherein the detection unit determines the set temperature based on data stored in the storage unit, and transmits a signal related to the determined set temperature to the steam gas heater. A temperature control system according to any one of claims 5 to 8,
The temperature setting of the steam gas heater is set to 1.0 degree from the predetermined value in response to the measurement of the decrease in the load of the power generation amount or the load of the power generation amount being substantially constant for a predetermined time. A temperature control system, wherein the temperature is lowered within a range of 2.0 degrees or less.

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