JP2016217553A - Cooperation steam system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooperation steam system which can operate more stably by keeping a temperature of a heat source fluid in a proper temperature range.SOLUTION: A cooperation steam system 100 includes: a plurality of steam systems 1A, 1B, 1C; a heat source fluid supply line 211; and a unit number control device 400. The steam systems 1A, 1B, 1C include: steam generating devices 10A, 10B, 10C; steam boosting devices 20A, 20B, 20C; and low pressure steam pressure measurement units 31A, 31B, 31C. The unit number control device 400 includes: a unit number control unit 450 for reducing the unit number of the steam systems 1 to be operated by one unit in the case where an average value calculated by an average load factor calculation unit 420 is lower than a first reference load factor, in the case where a steam pressure acquired by a low pressure steam pressure acquisition unit 440 is higher than a first reference steam pressure, or in the case where the temperature of the heat source fluid acquired by a heat source fluid temperature acquisition unit 430 is lower than a first reference temperature.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a steam generator that generates steam using a heat source fluid such as hot water as a heat source, and a cooperative steam system that includes a plurality of steam systems each having a steam booster that boosts the steam generated by the steam generator.

  Conventionally, a steam system including a steam generator that generates steam using a heat source fluid such as hot water as a heat source, and a steam booster that boosts the steam generated by the steam generator has been proposed (for example, Patent Documents). 1). In such a steam system, the low-pressure steam generated by the steam generator is boosted by the steam booster and then supplied to the steam-using device.

JP 2008-138924 A

  By the way, when the circulation amount of the heat source fluid is large, that is, when the amount of heat recoverable from the heat source fluid is large, a plurality of the steam systems described above are arranged, and the plurality of steam systems are operated in cooperation to generate heat. By performing the recovery, the heat of the heat source fluid can be used more effectively. As described above, in a cooperative steam system in which a plurality of steam systems are operated in cooperation, it is required to control the number of steam systems to be operated so that the temperature of the heat source fluid does not fall below a predetermined temperature. For example, when jacket cooling water such as a gas engine is used as a heat source, it is preferable that cooling water in an appropriate temperature range is supplied to the gas engine. Therefore, in the cooperative steam system, it is required to perform heat recovery so that the cooling water supplied to the gas engine has an appropriate temperature.

  Therefore, an object of the present invention is to provide a cooperative steam system that can be operated more stably by keeping the temperature of the heat source fluid in an appropriate range.

  The present invention includes a plurality of steam systems that generate steam using a heat source fluid as a heat source, a heat source fluid supply line that supplies the heat source fluid to the plurality of steam systems, and a number control device that controls the plurality of steam systems. A plurality of the steam systems, respectively, a steam generator that generates low-pressure steam using a heat source fluid as a heat source, a steam booster that pressurizes low-pressure steam generated in the steam generator; A low-pressure steam supply line that supplies low-pressure steam generated by the steam generator to the steam booster; and a low-pressure steam pressure measurement unit that measures the steam pressure in the low-pressure steam supply line; A load factor acquisition unit that acquires load factors of a plurality of the steam boosters, and a plurality of operating steam rises acquired by the load factor acquisition unit Steam measured by the average load factor calculating unit for calculating the average value of the load factor of the apparatus, the heat source fluid temperature acquiring unit for acquiring the temperature of the heat source fluid flowing through the heat source fluid supply line, and the low pressure vapor pressure measuring unit When the average value calculated by the low-pressure vapor pressure acquisition unit for acquiring the pressure and the average load factor calculation unit is lower than the first reference load factor, the vapor pressure acquired by the low-pressure vapor pressure acquisition unit is the first reference A unit control unit that reduces the number of the steam systems to be operated by one when the vapor pressure exceeds or when the temperature of the heat source fluid acquired by the heat source fluid temperature acquisition unit falls below a first reference temperature; It is related with the cooperation steam system.

  In addition, the steam generator has a flow rate adjustment valve that adjusts the flow rate of the heat source fluid supplied to the steam generator, and the temperature of the heat source fluid that flows through the heat source fluid supply line becomes a preset target temperature. It is preferable that the first reference temperature is set to a temperature lower than the target temperature.

  The steam control unit fully closes the flow rate adjustment valve when the temperature falls below a lower limit temperature lower than the target temperature, and fully opens the flow rate adjustment valve when the temperature exceeds an upper limit temperature higher than the target temperature. Preferably, the first reference temperature is set to a temperature higher than the lower limit temperature.

  Further, the number control unit has a heat source fluid acquired by the heat source fluid temperature acquisition unit, wherein the average value calculated by the average load factor calculation unit exceeds a second reference load factor higher than the first reference load factor. Is higher than a second reference temperature higher than the first reference temperature, and the vapor pressure acquired by the low-pressure vapor pressure acquisition unit is lower than a second reference vapor pressure lower than the first reference vapor pressure. Further, it is preferable to increase the number of the steam systems to be operated by one.

  According to the cooperation steam system of the present invention, it can be operated more stably by keeping the temperature of the heat source fluid in an appropriate range.

It is a figure which shows the structure of the cooperation steam system which concerns on one Embodiment of this invention. It is a figure which shows the structure of the steam system which comprises a cooperation steam system. It is a functional block diagram which shows the structure of a number control apparatus.

  Hereinafter, a preferred embodiment of the cooperative steam system of the present invention will be described with reference to the drawings. The cooperative steam system 100 according to the present embodiment includes a plurality of steam systems 1 that generate steam by using a cooling water that cools the gas engine 200 as a waste heat source as a heat source fluid and pressurize the steam. More specifically, the cooperative steam system 100 includes a cooling water circulation line 210 through which cooling water for cooling the gas engine 200 circulates, a plurality of (in this embodiment, three) steam systems 1A, 1B, and 1C, A discharge steam line 40 through which the discharged steam discharged from the plurality of steam systems 1A, 1B, 1C flows, a steam header 300 in which the steam flowing through the discharge steam line 40 is gathered, and a plurality of steam systems 1A, And a unit number control device 400 for controlling 1B and 1C. The “line” is a general term for a line capable of flowing a fluid such as a flow path, a path, and a pipe line.

For example, the gas engine 200 is driven by using gas as fuel to generate electric power.
The cooling water circulation line 210 circulates cooling water that cools the gas engine 200. The cooling water circulation line 210 includes a hot water supply line 211 serving as a heat source fluid supply line for supplying high-temperature cooling water (hot water) subjected to heat recovery in the gas engine 200 to the steam systems 1A, 1B, and 1C, and the steam system 1A, A hot water discharge line 212 that supplies hot water discharged from 1B and 1C to the gas engine 200, a bypass line 213 that bypasses the hot water supply line 211 and the hot water discharge line 212, and a second bypass line that bypasses the hot water discharge line 212 214.

The upstream side of the hot water supply line 211 is connected to the gas engine 200. The downstream side of the hot water supply line 211 branches into three and is connected to steam systems 1A, 1B, 1C (steam generators 10A, 10B, 10C described later), respectively. A hot water temperature sensor 221 is disposed in the hot water supply line 211.
The hot water temperature sensor 221 is arranged on the upstream side of the branch portion in the hot water supply line 211, and measures the temperature of the hot water supplied to the steam systems 1A, 1B, 1C.

The bypass line 213 connects the hot water supply line 211 and the hot water discharge line 212. A three-way valve 215 as a cooling water supercooling prevention valve is disposed at a connection portion between the hot water supply line 211 and the bypass line 213. This three-way valve 215 switches the flow path of the hot water led out from the gas engine 200 and flowing through the hot water supply line 211 to the steam system 1A, 1B, 1C side or the bypass line 213 side. More specifically, the three-way valve 215 is used when the temperature of warm water flowing through the warm water supply line 211 measured by the warm water temperature sensor 221 falls below a preset first supercooling prevention temperature (for example, 115 ° C.). The hot water flow path is switched to the bypass line 213 side. Thereby, it is preventing that the temperature of a cooling water falls too much. In the present embodiment, the three-way valve 215 is configured by a motor valve.
The flow path of the three-way valve 215 is controlled by a control device (not shown) that controls the operation of the gas engine 200, for example.

  The upstream sides of the hot water discharge line 212 are connected to steam systems 1A, 1B, and 1C (steam generators 10A, 10B, and 10C described later), respectively. The hot water discharge lines 212 connected to the steam systems 1A, 1B, and 1C merge on the downstream side, and then connected to the gas engine 200.

A cooler 216, a first temperature sensor 217, a second temperature sensor 218, and a flow meter 219 are arranged in the hot water discharge line 212.
The cooler 216 performs heat recovery from the hot water flowing through the hot water discharge line 212.
The first temperature sensor 217 is disposed on the upstream side of the cooler 216 in the warm water discharge line 212 and measures the temperature of warm water before being introduced into the cooler 216.
The second temperature sensor 218 is arranged on the downstream side of the cooler 216 in the warm water discharge line 212 and measures the temperature of the warm water after heat recovery in the cooler 216.
The flow meter 219 is disposed on the downstream side of the second temperature sensor 218 and measures the flow rate of hot water flowing through the hot water discharge line 212.

  The second bypass line 214 bypasses the upstream side and the downstream side of the cooler 216 in the hot water discharge line 212. In the present embodiment, the second bypass line 214 connects the upstream side of the first temperature sensor 217 and the downstream side of the flow meter 219 to bypass the cooler 216. A three-way valve 220 is disposed at a connection portion between the upstream side of the second bypass line 214 and the hot water discharge line 212. The three-way valve 220 switches the flow path of the hot water discharged from the steam systems 1A, 1B, 1C and flowing through the hot water discharge line 212 to the cooler 216 side or the second bypass line 214 side. More specifically, in the three-way valve 220, when the temperature of the hot water flowing through the hot water discharge line 212 is lower than a preset second overcooling prevention temperature (for example, 118 ° C.), the hot water flow path is the second. It is switched so as to be on the bypass line 214 side. Thereby, it is preventing that the temperature of a cooling water falls too much. In the present embodiment, the three-way valve 220 includes a temperature sensor that measures the temperature of hot water and a switching mechanism (none of which is shown) that switches the flow path based on the temperature measured by the temperature sensor. Consists of.

The steam systems 1 </ b> A, 1 </ b> B, and 1 </ b> C are arranged in parallel to the cooling water circulation line 210. The steam systems 1A, 1B, and 1C include steam generators 10A, 10B, and 10C that generate steam, and steam boosters 20A, 20B, and 20C that boost the steam generated in the steam generators 10A, 10B, and 10C, respectively. Low-pressure steam supply lines 30A, 30B, 30C connecting the steam generators 10A, 10B, 10C and the steam boosters 20A, 20B, 20C, and low-pressure steam pressure sensors 31A, 31B, 31C as low-pressure steam pressure measuring units And comprising.
Since steam system 1A, 1B, 1C is provided with the same structure, the code | symbol of A, B, C is abbreviate | omitted in FIG. 2, and the specific structure of the steam system 1 is shown.

  The steam generator 10 generates steam using a relatively low-temperature heat source fluid such as waste heat from jacket cooling water of the gas engine 200. As shown in FIG. 2, the steam generator 10 includes a tank unit 11, a tube 12 and a spray nozzle 13 disposed inside the tank unit 11, a spray water supply line 16, a makeup water line 17, and hot water. A bypass line 18, a three-way valve 19 as a flow rate adjustment valve, and a steam control unit 50 are provided.

The tank part 11 constitutes a main body part in the steam generator 10. The inside of the tank unit 11 is maintained at a negative pressure or a low pressure (for example, about −0.05 MPaG to 0.1 MPaG), and steam is generated inside the tank unit 11. A base end portion of a low-pressure steam supply line 30 described later is connected to the upper portion of the tank portion 11.
The tank unit 11 is provided with a safety valve 32. When the pressure inside the tank unit 11 exceeds a predetermined pressure (set pressure), the safety valve 32 releases the steam to the outside and reduces the pressure inside the tank unit 11 (steam generating device 10).

  The tube 12 extends in the horizontal direction inside the tank portion 11. More specifically, a plurality of tubes 12 are arranged in the tank portion 11 with a predetermined interval in the horizontal direction, and a plurality of tubes 12 are also arranged in the height direction with a predetermined interval. The distal end side of the hot water supply line 211 is connected to one end side (inlet side) of the tube 12, and the proximal end side of the hot water discharge line 212 is connected to the other end side (outlet side). Thereby, warm water as a heat source fluid flows through the tube 12.

The spray nozzle 13 is disposed above the tube 12 inside the tank unit 11. The spray nozzle 13 sprays water toward the tube 12.
The spray water supply line 16 connects the lower part of the tank unit 11 and the spray nozzle 13, and supplies water stored in the lower part of the tank unit 11 to the spray nozzle 13 as spray water. A spray water pump 161 is disposed in the spray water supply line 16.
The spray water pump 161 pumps water stored in the tank unit 11 to the spray nozzle 13.

The makeup water line 17 connects the tank unit 11 and a storage tank or the like (not shown) that stores water. The makeup water line 17 supplies makeup water to the tank unit 11. A makeup water pump 171 is disposed in the makeup water line 17.
The makeup water pump 171 pressurizes water supplied from a storage tank or the like and supplies it to the inside of the tank unit 11.

The hot water bypass line 18 connects the upstream side of the inlet of the tube 12 and the downstream side of the outlet, and bypasses the hot water supply line 211 and the hot water discharge line 212.
The three-way valve 19 is disposed at a connection portion between the hot water supply line 211 and the hot water bypass line 18. The three-way valve 19 adjusts the amount of hot water flowing from the hot water supply line 211 to the steam generator 10 side and the flow rate of hot water flowing to the hot water bypass line 18 side. In the present embodiment, the three-way valve 19 is configured by a motor valve capable of adjusting the opening degree.

  The steam control unit 50 controls the amount of low-pressure steam generated by the steam generator 10 by adjusting the opening of the three-way valve 19. Specific control by the steam control unit 50 will be described later.

According to the steam generator 10 described above, in a state where the flow path from the hot water supply line 211 to the hot water bypass line 18 is closed by the three-way valve 19, first, hot water (for example, about 90 ° C.) serving as a heat source from the gas engine 200. Is supplied to the tube 12 through the hot water supply line 211. The hot water supplied to the tube 12 is introduced into the tube 12 disposed inside the tank unit 11.
On the other hand, spray water is sprayed from the spray nozzle 13 toward the tube 12 inside the tank portion 11. Further, the inside of the tank unit 11 is maintained at a negative pressure or a low pressure (for example, about −0.05 MPaG to 0.1 MPaG). As a result, the hot water flowing through the tube 12 is deprived of heat by the spray water, drops to about 85 ° C., and is discharged through the hot water discharge line 212.

  In addition, a thin liquid film is formed on the surface of the tube 12 through which warm water flows by spraying water at about 80 ° C. from the spray nozzle 13. As described above, in a state where the inside of the tank unit 11 is maintained at a negative pressure, a thin liquid film is formed on the surface of the tube 12, so that it is sprayed by the hot water flowing through the inside of the tube 12 and the spray nozzle 13. Even when the temperature difference with water is relatively small (for example, about 10 ° C.), steam can be efficiently generated.

The steam generated inside the tank unit 11 is led out from the low-pressure steam supply line 30.
The water that has not become steam inside the tank unit 11 is stored in the lower part of the tank unit 11. The water stored in the lower part of the tank unit 11 is pumped up to the spray nozzle 13 by the spray water pump 161 through the spray water supply line 16 and sprayed on the tube 12 again.
When the water stored in the tank unit 11 is reduced, the supply water is supplied from the supply water line 17 to the tank unit 11.

Further, the amount of steam generated inside the tank unit 11 can be adjusted by adjusting the flow rate of the hot water supplied to the tube 12 by adjusting the opening of the three-way valve 19 under the control of the steam control unit 50.
In the present embodiment, the steam controller 50 controls the three-way valve 19 so that the temperature of the hot water flowing through the hot water supply line 211 measured by the hot water temperature sensor 221 becomes a preset target temperature (for example, 118 ° C.). The opening degree is controlled, and the amount of steam generated by the steam generator 10 is controlled.
That is, when the temperature of the warm water measured by the warm water temperature sensor 221 is higher than the target temperature, the steam control unit 50 controls the opening degree of the three-way valve 19 so that the flow rate of the warm water supplied to the tube 12 increases. . Thereby, the quantity of the vapor | steam produced | generated in the steam generator 10 increases. Further, since the amount of heat taken away from the hot water in the steam generator 10 increases, the temperature of the hot water decreases.
On the other hand, when the temperature of the hot water measured by the hot water temperature sensor 221 is lower than the target temperature, the steam control unit 50 controls the opening degree of the three-way valve 19 so that the flow rate of the hot water supplied to the tube 12 decreases. . Thereby, the quantity of the vapor | steam produced | generated in the steam generator 10 reduces. Moreover, since the amount of heat taken away from the hot water decreases, the temperature of the hot water rises.

Further, the steam control unit 50 causes the hot water to flow toward the entire hot water bypass line 18 when the temperature of the hot water measured by the hot water temperature sensor 221 falls below a lower limit temperature (for example, 116 ° C.) lower than the target temperature. The three-way valve 19 is fully closed. Thereby, generation | occurrence | production of a vapor | steam is stopped in the steam generation apparatus 10, and since the calorie | heat_amount is not taken from warm water, the further fall of the temperature of warm water is suppressed.
On the other hand, when the temperature of the warm water measured by the warm water temperature sensor 221 exceeds the upper limit temperature (for example, 120 ° C.) higher than the target temperature, the steam control unit 50 causes the three-way valve so that the warm water flows toward the entire tube 12 side. 19 is fully opened. Thereby, since the calorie | heat amount taken away from warm water in the steam generator 10 can be maximized, the fall of the temperature of warm water can be accelerated | stimulated.

The steam booster 20 sucks and compresses the low-pressure steam (for example, −0.05 MPaG to 0.1 MPaG) generated in the steam generator 10 to boost the pressure. The steam booster 20 includes a compression unit 21 that compresses low-pressure steam, and a compression control unit 22 that controls the operation of the compression unit 21.
The compression unit 21 is configured by, for example, a screw-type steam compressor, and boosts low-pressure steam to about 0.4 MpaG to 0.8 MPaG.
The compression control unit 22 controls the operation (load factor) of the compression unit 21 based on the pressure of the steam flowing through the low-pressure steam supply line 30 (the pressure of the steam introduced into the compression unit 21). More specifically, the compression control unit 22 sets the steam booster 20 so that the pressure of the steam flowing through the low-pressure steam supply line 30 becomes a set target pressure (for example, 0.04 MPa to 0.05 MPa). Control the load factor.

  That is, when the steam pressure in the low-pressure steam supply line 30 is higher than the target pressure, the compression control unit 22 sets the load factor to the maximum (load factor 100%) and the steam booster 20 (compression unit 21). Drive. As a result, an upper limit amount of steam is sucked into the steam pressure increasing device 20, and the steam pressure in the low pressure steam supply line 30 tends to decrease. Even when the steam booster 20 is driven at a load factor of 100%, the steam booster 20 operates at a load factor of 100% if the steam pressure in the low-pressure steam supply line 30 exceeds the target pressure. Continue.

On the other hand, when the steam pressure in the low-pressure steam supply line 30 falls below the target pressure, the compression control unit 22 decreases the load factor of the steam booster 20 (compression unit 21). Thereby, the amount of steam sucked into the steam booster 20 decreases, and the steam pressure of the low-pressure steam supply line 30 increases.
In this way, by controlling the steam pressure of the low-pressure steam supply line 30 to be the target pressure, the steam generator 10 can generate steam efficiently and stably.

The low pressure steam supply line 30 supplies the low pressure steam generated in the steam generator 10 to the steam booster 20.
The low pressure steam pressure sensor 31 is disposed in the low pressure steam supply line 30. The low pressure steam pressure sensor 31 measures the steam pressure (pressure of the low pressure steam) inside the low pressure steam supply line 30.

As shown in FIG. 1, the discharge steam line 40 includes a plurality of first discharge steam lines 41A, 41B, and 41C whose proximal ends are connected to the steam systems 1A, 1B, and 1C, respectively. And a collective steam line 42 connected to the front end side of the discharge steam lines 41 </ b> A, 41 </ b> B, 41 </ b> C and having the front end side connected to the steam header 300.
Discharge steam pressure sensors 43A, 43B, and 43C and on-off valves 44A, 44B, and 44C are disposed in the plurality of first discharge steam lines 41A, 41B, and 41C, respectively.
The discharge steam pressure sensors 43A, 43B, and 43C measure the vapor pressure (discharge steam pressure) inside the first discharge steam lines 41A, 41B, and 41C.
The on-off valves 44A, 44B, 44C open and close the flow paths of the first discharge steam lines 41A, 41B, 41C.

The collective steam line 42 collects steam flowing through the plurality of first discharge steam lines 41 </ b> A, 41 </ b> B, and 41 </ b> C and supplies the steam to the steam header 300.
The steam header 300 collects steam generated in the plurality of steam systems 1A, 1B, and 1C. The steam header 300 is generated by steam generated by an exhaust gas boiler (not shown) that generates steam using heat stored in the exhaust gas of the gas engine 200 or by another boiler (not shown). Steam is also collected.
A header pressure sensor 310 is disposed on the steam header 300. The header pressure sensor 310 measures the vapor pressure (header pressure) inside the vapor header 300.
The steam collected in the steam header 300 is supplied to steam use equipment (not shown).

The number control device 400 controls the operation of the cooperative steam system 100 (the operations of the plurality of steam systems 1A, 1B, 1C).
In the present embodiment, the number control device 400 is operated based on the load factor of the steam booster 20, the pressure of the low-pressure steam in the low-pressure steam supply line 30, and the temperature of the hot water flowing through the hot-water supply line 211. Control the number of units.

More specifically, as shown in FIG. 3, the unit control device 400 includes a load factor acquisition unit 410, an average load factor calculation unit 420, a heat source fluid temperature acquisition unit 430, a low pressure vapor pressure acquisition unit 440, A number control unit 450.
The load factor acquisition unit 410 acquires the load factors of the steam boosters 20A, 20B, and 20C.
The average load factor calculation unit 420 calculates the average value of the load factors of the steam booster 20 during operation among the load factors of the steam booster 20 acquired by the load factor acquisition unit 410.

The heat source fluid temperature acquisition unit 430 acquires the temperature of the hot water flowing through the hot water supply line 211. In the present embodiment, the heat source fluid temperature acquisition unit 430 acquires the temperature of hot water measured by the hot water temperature sensor 221.
The low pressure vapor pressure acquisition unit 440 acquires the vapor pressure measured by the low pressure vapor pressure sensor 31.

  The number control unit 450 includes an average value of the load factors of the plurality of steam boosters 20 acquired by the average load factor calculation unit 420, the temperature of the hot water acquired by the heat source fluid temperature acquisition unit 430, and the low pressure vapor pressure acquisition unit 440. The number of the steam systems 1 to be operated is increased or decreased based on the steam pressure acquired by the above.

First, the control for reducing the number of steam systems 1 to be operated will be described.
When the average value of the load factors of the plurality of steam boosters 20 calculated by the average load factor calculating unit 420 is lower than a preset first reference load factor (for example, 75%), the number control unit 450 reduces the low pressure. When the vapor pressure acquired by the vapor pressure acquisition unit 440 exceeds a preset first reference vapor pressure (for example, 750 kPa), or the temperature of the hot water acquired by the heat source fluid temperature acquisition unit 430 is preset. When the temperature falls below the first reference temperature (for example, 115 ° C.), the number of steam systems 1 to be operated is decreased by one.
Accordingly, the steam system 1 is operated not only by the operating state of the steam pressure increasing device 20 (load factor of the steam pressure increasing device 20) and the operating state of the steam generating device 10 (pressure of the low pressure steam) but also by the temperature of the supplied hot water. The number of units can be controlled.

  Here, in the present embodiment, the first reference temperature is set to a temperature lower than the target temperature set for the opening control of the three-way valve 19 in the steam generator 10. Thereby, when the temperature of the hot water falls below the target temperature, first, the opening degree of the three-way valve 19 can be adjusted by the steam control unit, and then the temperature of the hot water further falls and falls below the first reference temperature. The number of steam systems 1 to be operated can be reduced.

  The first reference temperature is set to a temperature higher than the lower limit temperature at which the three-way valve 19 is fully closed in the steam generator 10. Thereby, when the temperature of the hot water falls below the target temperature, first, the opening degree of the three-way valve 19 is decreased by the steam control unit 50, and then the three-way valve 19 is fully closed when the temperature of the hot water further decreases. The number of steam systems 1 to be operated can be reduced.

Next, control when increasing the number of steam systems 1 to be operated will be described.
The number control unit 450 exceeds the second reference load factor (for example, 95%) in which the average value of the load factors of the plurality of steam boosters 20 calculated by the average load factor calculating unit 420 is higher than the first reference load factor. The temperature of the hot water acquired by the heat source fluid temperature acquisition unit 430 exceeds a second reference temperature (for example, 120 ° C.) higher than the first reference temperature, and the vapor pressure acquired by the low-pressure vapor pressure acquisition unit 440 is When the pressure falls below a second reference steam pressure (for example, 600 kPa) lower than the one reference steam pressure, the number of steam systems 1 to be operated is increased by one.
As a result, when the steam booster 20 is operating at a high load factor and the pressure of the low-pressure steam is low (that is, the steam consumption in the steam-using device) in a state where the amount of heat that can be recovered in the hot water is sufficient. Therefore, the number of steam systems 1 to be operated can be suitably increased based on the consumption of steam by the steam-using equipment and the temperature state of the hot water.

  According to the cooperation steam system 100 of this embodiment demonstrated above, there exist the following effects.

  (1) It comprised including several steam system 1A, 1B, 1C and the number control apparatus 400 which controls these several steam system 1A, 1B, 1C. When the average value of the load factors of the steam boosters 20A, 20B, and 20C operating the unit control device 400 is lower than the first reference load factor, the low pressure generated in the steam generators 10A, 10B, and 10C. Number control unit that reduces the number of steam systems 1A, 1B, 1C to be operated by one when either the steam pressure of the steam exceeds the first reference steam pressure or the temperature of the hot water falls below the first reference temperature 450 was configured. As a result, the number of steam systems 1A, 1B, and 1C to be operated can be controlled not only by the operating state of the steam boosters 20A, 20B, and 20C and the steam generators 10A, 10B, and 10C but also by the temperature of the supplied hot water. The cooperative steam system 100 can be operated more stably.

  (2) The steam generators 10A, 10B, and 10C are adjusted to the three-way valves 19A, 19B, and 19C that adjust the supply amount of the hot water, and the three-way valves 19A, 19B, and 19C so that the temperature of the hot water becomes the target temperature. The steam control units 50A, 50B, 50C to be controlled are included, and the first reference temperature is set lower than the target temperature. Thereby, when the temperature of warm water falls below target temperature, first, the opening degree of the three-way valves 19A, 19B, 19C can be adjusted by the steam control units 50A, 50B, 50C, and then the temperature of the warm water further decreases. When the temperature falls below the first reference temperature, the number of steam systems 1A, 1B, 1C to be operated can be reduced. Therefore, the number of steam systems 1A, 1B, and 1C to be operated by the number control unit 450 can be controlled without hindering the opening control of the three-way valves 19A, 19B, and 19C by the steam generators 10A, 10B, and 10C.

  (3) When the steam control units 50A, 50B, and 50C have the lower limit temperature lower than the target temperature, the three-way valves 19A, 19B, and 19C are fully closed, and the upper limit temperature higher than the target temperature is exceeded. The three-way valves 19A, 19B, and 19C were fully opened, and the first reference temperature was set higher than the lower limit temperature. Thereby, when the temperature of the hot water falls below the target temperature, first, the opening degree of the three-way valves 19A, 19B, 19C is reduced by the steam control units 50A, 50B, 50C, and then the temperature of the hot water further decreases. In addition, the number of steam systems 1A, 1B, and 1C that are operated before the three-way valves 19A, 19B, and 19C are fully closed can be reduced.

  (4) The number control unit 450 has an average value of the load factor of the steam booster 20 that is operating exceeds the second reference load factor that is higher than the first reference load factor, and the temperature of the hot water is higher than the first reference temperature. When the vapor pressure acquired by the low-pressure vapor pressure acquisition unit 440 is lower than the second reference vapor pressure lower than the first reference vapor pressure, the number of the steam systems 1 to be operated is reduced. Increased. As a result, when the steam booster 20 is operating at a high load factor and the pressure of the low-pressure steam is low (that is, the steam consumption in the steam-using device) in a state where the amount of heat recoverable in the hot water is sufficient. Therefore, the number of steam systems 1 to be operated can be suitably increased based on the consumption of steam by the steam-using equipment and the temperature state of the hot water. Therefore, the cooperative steam system 100 can be operated more stably.

As mentioned above, although preferable one Embodiment of the cooperation steam system 100 of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, in the present embodiment, the cooperative steam system 100 is configured by the three steam systems 1A, 1B, and 1C, but is not limited thereto. That is, a cooperation steam system may be constituted by two steam systems, and may be constituted by four or more steam systems.

  In the present embodiment, the low pressure steam pressure sensor 31 is disposed in the low pressure steam supply line 30 and the pressure of the steam flowing through the low pressure steam supply line 30 is measured. However, the present invention is not limited to this. That is, since the pressure of the steam flowing through the low-pressure steam supply line 30 is equal to the pressure of the steam in the steam generator 10 (tank part 11), the low-pressure steam pressure sensor may be arranged in the steam generator (tank part). .

  Moreover, in this embodiment, although the flow regulating valve was comprised by the three-way valve 19, it is not restricted to this. That is, the flow rate adjusting valve may be configured by combining a plurality of valves.

  Moreover, in this embodiment, although the gas engine 200 was used as a waste heat source, it is not restricted to this. That is, a diesel engine or a gasoline engine may be used as a waste heat source.

1A, 1B, 1C Steam system 10A, 10B, 10C Steam generator 19A, 19B, 19C Three-way valve (flow control valve)
20A, 20B, 20C Steam booster 30A, 30B, 30C Low pressure steam supply line 31A, 31B, 31C Low pressure steam pressure sensor (low pressure steam pressure measuring unit)
50A, 50B, 50C Steam control unit 100 Coordinated steam system 211 Hot water supply line (heat source fluid supply line)
400 Number control device 410 Load factor acquisition unit 420 Average load factor calculation unit 430 Heat source fluid temperature acquisition unit 440 Low pressure steam pressure acquisition unit 450 Number control unit

Claims (4)

A cooperative steam system comprising: a plurality of steam systems that generate steam using the heat source fluid as a heat source; a heat source fluid supply line that supplies the heat source fluid to the plurality of steam systems; and a number control device that controls the plurality of steam systems. Because
Each of the plurality of steam systems is
A steam generator that generates low-pressure steam using a heat source fluid as a heat source;
A steam booster that boosts the low-pressure steam generated in the steam generator;
A low-pressure steam supply line for supplying low-pressure steam generated by the steam generator to the steam booster;
A low-pressure vapor pressure measuring unit for measuring the vapor pressure in the low-pressure steam supply line,
The number controller is
A load factor acquisition unit for acquiring a load factor of a plurality of the steam boosters;
An average load factor calculating unit that calculates an average value of the load factors of the plurality of operating steam boosters acquired by the load factor acquiring unit;
A heat source fluid temperature acquisition unit for acquiring the temperature of the heat source fluid flowing through the heat source fluid supply line;
A low pressure vapor pressure acquisition unit for acquiring the vapor pressure measured by the low pressure vapor pressure measurement unit;
When the average value calculated by the average load factor calculation unit is lower than the first reference load factor, when the vapor pressure acquired by the low pressure vapor pressure acquisition unit exceeds the first reference vapor pressure, or the heat source fluid A cooperative steam system comprising: a unit control unit that reduces the number of the steam systems that are operated when the temperature of the heat source fluid acquired by the temperature acquisition unit falls below a first reference temperature. The steam generator is
A flow rate adjusting valve for adjusting the flow rate of the heat source fluid supplied to the steam generator;
A steam control unit that controls the opening of the flow rate adjusting valve so that the temperature of the heat source fluid flowing through the heat source fluid supply line becomes a preset target temperature;
The cooperative steam system according to claim 1, wherein the first reference temperature is set to a temperature lower than the target temperature. The steam control unit fully closes the flow rate adjustment valve when the temperature is lower than a lower limit temperature lower than the target temperature, and fully opens the flow rate adjustment valve when the temperature exceeds an upper limit temperature higher than the target temperature. ,
The cooperative steam system according to claim 2, wherein the first reference temperature is set to a temperature higher than the lower limit temperature.   The number control unit has a temperature of the heat source fluid acquired by the heat source fluid temperature acquisition unit, wherein the average value calculated by the average load factor calculation unit exceeds a second reference load factor higher than the first reference load factor. Exceeds a second reference temperature higher than the first reference temperature, and the vapor pressure acquired by the low-pressure vapor pressure acquisition unit falls below a second reference vapor pressure lower than the first reference vapor pressure, The cooperative steam system according to claim 1, wherein the number of the steam systems to be operated is increased by one.

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