JPS5963310A - Compound plant - Google Patents

Abstract

PURPOSE:To provide higher overall generated power in a compound plant designed that the secondary power generating system is caused to generate power with the aid of waste heat of the primary power generating system by controlling the operating condition of working fluid as to maximize the power of the secondary system without changing the generated capacity of the primary system. CONSTITUTION:In a system, for example, wherein an evaporator 5, namely, a condenser of a primary system nuclear power plant recovers waste heat and power is then generated in a secondary system which uses ammonia as working fluid, a controller 25 computes the physical properties of a plurality of fluids and the operating condition of the working fluids is determined on the bases of the thermal income and expenditure of each of the turbine 14, the evaporator 5 and a condenser 16 of the seconday system according to those factors of the preset value and temperature of the working fluid in the secondary system at the inlet of the evaporator 5, the temperature at the outlet thereof and the pressure inside the condenser 16. And the capacity of generated power is calculated and searched by use of a criterion function of a Rankine cycle. The working fluid is then controlled under the determined operating condition. Waste heat may be effectively used without changing the operating condition of the primary system which has great capacity of generated power, and hence the entire generated power may be obtained at higher level.

Description

[Detailed description of the invention] The present invention recovers exhaust heat from a secondary power generation plant,
We are saddened by the complex glands that generate power from secondary power generation plants, and in particular, we want to maximize the power generation capacity of secondary power generation plants without changing the generation capacity of secondary power generation grounds.
Concerning a complex plant with 1jlJ# equipment.

Thermal power plants, still nuclear power plants, are beginning to adopt the concept of complex plants in order to effectively utilize the heat generated. This is a secondary power generation plant that uses thermal or nuclear power as the primary power generation grant, and uses low-temperature waste heat (~50℃) from the Daishi Plant to generate a low-temperature turbine using Freon or other fluid as the working fluid. The concept is to use it for power generation.

An example of the prior art of this complex plant will be explained using FIG. 1. In this example, exhaust heat from a primary nuclear power plant with a t-grind output of 375 MW is extracted from the reactor core 1, main steam station 2, turbine 3, generator 4, condenser 5, feed water pump, and feed water F pipe 7. is recovered through an intermediate heat exchange loop consisting of a circulation pump 8, a mixing tank 9, the above-mentioned primary system condensation 55, etc. , a condenser 16, a circulation pump 17, etc., and is used for power generation in a secondary power generation plant with an electrical output of 10 MW, which operates Freo/J&M. The turbine 14 is called a low-temperature turbine. In general, the temperature of the exhaust heat of the primary power plant is low, so the power generation St of the secondary power plant is less than 1710, which is the power generation capacity of the secondary power plant. In order to increase this, it is first important to maintain the power generation output of the secondary power generation plant, and secondly, it is important to increase the power generation capacity of the secondary power generation plant.

However, in the conventional technology, the operating conditions of the secondary power generation plant are determined appropriately regardless of the operating conditions of the secondary power generation plant, and then the steam conditions of the condenser 5 of the secondary power generation plant are changed. We have set the operating conditions for the Naiyotsu intermediate heat exchanger. In a composite graft with operating conditions set in this way, the power generation output of the -order system originating plant is kept constant.

However, the amount of heat released from the secondary dilute acid plant in the condenser 5 is larger than the amount of heat supplied to the secondary generation graft by the evaporator 12, and unnecessary heat fusion is generated in the secondary generation graft. , intermediate heat exchange (wasted in the hot water drainage flow path 11), which was not preferable in terms of increasing the power generation capacity of the secondary generation plant.In the example of the prior art, the intermediate heat exchanger circulation flow path 1
0 flow rate of 19200 TiN is used for power generation in the secondary early generation plant, whereas the flow rate of 18500
TiN was discarded from the intermediate exchanger drainage channel 11, which indicates that about 50% of the exhaust heat from the Kakutun plant in the secondary system was wasted without being used for power generation. means. In other words, in the conventional technology, in a combined plant, the operating conditions and power generation capacity of the secondary power generation plant were determined independently of the operating conditions of the primary power generation plant.
100% of the exhaust heat from the secondary generation plant is not utilized, and -
There was a problem with the effective use of waste heat from the secondary generation plant (increasing the power generation mix of the complex plant).

The object of the present invention is to overcome the drawbacks of the prior art described above, and to
Create a secondary early-release plant to maximize the power obtained from the secondary early-release acid plant without changing the power generation capacity of the secondary power plant! Operating conditions for 1Φ fluid: el
Our objective is to provide a complex plant equipped with J+ wholesale equipment. In other words, the control system does not change the operating conditions of the primary power generation plant, which has a large power generation capacity, and the exhaust heat from the secondary power generation system can be effectively used in the secondary yarn power generation plant, increasing the power generation output of the entire combined plant. It is an object of the present invention to provide a composite graft comprising:

In order to achieve the above-mentioned object, the composite graft of the present invention recovers exhaust heat from a primary power generation plant using a circulation flow path and uses the physical properties of a plurality of fluids in a system in which waste heat is recovered for use in power generation in a secondary power generation plant. The device that calculates the value, the operating conditions of the working fluid of the primary yarn power generation plant that condenses in the evaporator of the secondary power generation brand, and the pressure at the arbitrarily set evaporator inlet of the working fluid of the secondary power generation plant. , temperature and 4'f
Based on the temperature at the exit of the fE reactor and the j pressure at the condenser, and the heat balance of the turbine, evaporator, and condenser of the secondary system power generation gland, create a secondary early-starting gland! After determining the operating conditions for the power fluid, we will install a device that determines the capacitance of the secondary power generation plant based on the Rankine cycle evaluation formula, and a pressure peak at the inlet of the evaporator for the working fluid of the secondary unexploded Fi granod. A device that searches for a power generation container in a secondary system generation grid by changing the temperature and temperature at the generator outlet and pressure in the condenser, and the determined working fluid of the secondary system power generation plant. Based on the operating conditions of Features.

Hereinafter, the present invention will be explained in detail using Examples.

In the embodiment of the composite graft according to the present invention shown in FIG. 2, a nuclear reactor core 1, a main steam blade 2, a turbine 3, a generator 4,
Exhaust heat from the primary nuclear power generation plant with an electrical output of 1100 MW, consisting of the condenser 5, water supply pump 6, and water supply piping 7, is recovered by the evaporator 5 (also the # city water system of the secondary nuclear power generation ground). Then, steam'#13, turbine 14,
It is used to generate a secondary power generation plant consisting of a generator 15, a condenser 16, a circulation tube 17, etc. This secondary power generation plant uses ammonia as the working fluid and has an electrical output of 100 MW.

The difference with the prior art shown in FIG. 1 is that the block 25 shown in FIG. 2 determines the operating conditions of the secondary power plant based on the operating conditions of the working fluid of the secondary power plant. Then, control the pressure and flow rate of the working fluid in the evaporator of the secondary power generation plant, the pressure in the condenser, and the coolant flow rate in the condenser of the secondary power generation plant to match the operating conditions. It's about doing. The configuration and function of the block 25 shown in FIG. 2 will be explained using FIGS. 3 to 10. FIG. 3 is a configuration diagram of the block 25, which is composed of the following four devices.

1) Device for calculating the physical property values of multiple fluids 27゜2) Construction of a primary system generating plant that condenses in the evaporator (5 in Figure 2) of the secondary system generating plant @ (Operating conditions of 6 units, The pressure and temperature at the evaporator inlet, the temperature at the evaporator outlet, and the condenser (16 in Figure 2) set arbitrarily in the secondary power generation gland.
Determine the operating conditions of the working fluid of the secondary system power plant based on the pressure at blocks 32, 33, and 34, and a block 35 that calculates the power generation capacity of the secondary power generation plant based on the Rankine cycle evaluation formula from the determined operating conditions of the secondary system dispatch plant θ Hanaki. Power generation capacity calculation device hood 28° 3) A block 31 for setting the pressure and temperature of the working fluid at the evaporator inlet, the temperature at the evaporator outlet, and the pressure at the condenser of the secondary system generating plant, and the above-mentioned pressure. , temperature, etc., to search for the power generation capacity of the secondary power generation plant. Based on the operating conditions of the working fluid of the secondary power generation plant determined by the device, the pressure and flow rate of the working fluid of the secondary power generation plant at the evaporator inlet, the pressure at the condenser, and the secondary yarn power generation are calculated. A device 29 for controlling the flow rate of coolant in the grand condenser; a device 27 for calculating the physical property values of a plurality of fluids;
Read 0nly Memory)
An index that indicates the iK name, a state variable (for example, temperature T, pressure P, etc.) is a person, force, and a physical property value determined by these state variables (for example, enthalpy hX, specific heat C1, etc.)
Output.

Next, using the physical property value output from the device 27 for calculating the physical property values of a plurality of fluids, in block 32, the operating conditions of the evaporator of the secondary power generation plant (the operating conditions of the evaporator are shown in FIG. 4) are calculated. )
We show how to calculate the heat balance of Device 2 shown in Figure 3
The input to 7 is Intelx II (-1, 44JJ fluid is water) which indicates the name of the working fluid of the - secondary power generation plant.
, the pressure of the working fluid at the inlet of the evaporator (5 in Figure 4) of the secondary system power plant, 7P+, the temperature 'I'lI + quality if class + 711 + dryness X, and the pressure at the evaporator outlet. Temperature T. and an index indicating the name of the working fluid of the secondary power generation system.

(-29 The working body is ammonia), the pressure PD of the working fluid of the secondary power generation gland at the evaporator inlet, the temperature 1iTp, and the temperature TA at the evaporator outlet.

Operating conditions P of the working fluid of the primary system starting grant mentioned above,
, 'r11, ml, etc. are the evaporator (5 in Figure 4)
This was detected using pressure gauges, thermometers (to measure temperature), flowmeters, etc. attached to the air. The operating conditions of the secondary generation plant are still in block 3 for PCI To+ TA.
This is the value set in 1. The quantity determined from the heat balance of the evaporator is the working fluid flow imD of the secondary generation plant.

From the device 27 shown in FIG. 3 to the block 3 shown in FIG.
The output to 2 is the pressure P of the working fluid of the entire plant in the -order system.
Saturated liquid enthalpy h at 1: (P+).

Saturated steam engineering/Talbi h2 (p+), specific heat c of 6 bodies:
(p.

TB+T+2) and working flow of secondary power plant 2 Saturated liquid enthalpy h at body pressure PD: (FD).

Saturated steam enthalpy h2 (Pa), saturation temperature T2 (PD
) (=TzuT6), specific heat of liquid C2 (PD.

Tn+Tr; TA
+Ta-Yo,-), & specific heat C: (PD,-□-1)
and the input Mt + X to the device 27, etc. The block 32 includes, for example, an adder (41
~43), subtractors (36~40), multipliers (44~48)
) and a divider (49), and from the heat balance in the evaporator of the secondary power generation plant, the mass flow rnD of the working fluid ammonia of the secondary power generation plant is calculated using equation (1). .

Further, the block 32 may be formed of a microcomputer (analogous microcomputer) and may be provided with the above-described functions.

Next, in block 33, the heat balance of the turbine (14 in Fig. 2) of the secondary power plant is calculated by using the physical property value output of the device 2'7 for calculating the physical property values of a plurality of driftwoods. shows. In the turbine, the working fluid ammonia changes isentropically from point A to point B in the temperature-entropy diagram shown in FIG. In this case, the input to the device 27 shown in FIG. ),
The entropy S (=S (PA, ' TA) and the pressure Pn of the working fluid at the turbine outlet. The operating conditions PA (= PIl) and PR of the working fluid of the secondary power generation plant are the values set in block 31. The quantity determined from the heat balance of the turbine is the dryness Xn of the working fluid ammonia at the turbine outlet.The output from the device 27 shown in FIG. 3 to the block 33 shown in FIG. , saturated liquid enthalpy at pressure Pa of working fluid of secondary power generation plant)
IF (Py+), saturated vapor enthalpy h; (Pa) and pressure pH, entropy 5 (=S (PA, TA
) ) is the enthalpy 112 (PBIS).

For example, as shown in FIG. 7, the block 33 is composed of subtracters (50 to 51) and a divider (52), and uses equation (2) to calculate the amount of working fluid ammonia at the turbine outlet of the secondary power generation plant. Calculate the dryness X'B.

Further, the block 33 may be constituted by a computer (for example, a microcomputer) and may be provided with the above-mentioned functions.

Next, using the physical property value output from the device 27 that calculates the physical property values of a plurality of fluids, in block 34, a condenser of the secondary power generation plant (the operating conditions of the condenser are shown in FIG. 8) is used.
We show a method to calculate the heat balance of Device 2 shown in Figure 3
The inputs to 7 are the index I 2 (= 2, the working fluid is ammonia) indicating the working fluid base of the -order system power plant, the pressure PR at the condenser population of the above fluid #, the entropy S (= S (PA , TA) and an index r s (= t , created by I
fIh (Af, body is water), coolant pressure P2 (usually atmospheric pressure), condenser inlet temperature T, I, and condenser outlet temperature T
,. It is. Coolant operating conditions P2+T! + is detected by a pressure gauge and thermocouple attached to the coolant intake pipe. The condenser outlet temperature T,. is a preset value due to the thermal limitations of the condenser. The quantity determined from the heat balance of the condenser is the coolant flow itmz. The outputs from the device t27 shown in FIG. 3 to the block 34-\ shown in FIG. (Pn), and the condenser coolant block 34, for example as shown in FIG.
54), multipliers (55 to 57), and a divider (58), and based on the heat balance in the condenser of the secondary power generation plant, the coolant flow rate m of the condenser is calculated by equation (3). calculate.

Further, the block 34 is constituted by a computer (for example, a microcomputer), and is configured as described above.
You can let it go.

The working fluid discharged from the condenser (16 in Fig. 2) of the secondary power generation 7” land is passed through the circulation valve (17 in Fig. 2).
Even the pressure PoKh oral pressure is determined from the pressure PR.

The block 35 calculates the abrasive capacity of the secondary power generation plant based on the Rankine cycle evaluation formula from the operating conditions of the working fluid of the secondary power generation blunt determined as described above. As shown in Figure 10, the subtractor (
59 to 61), and mirror devices (62, 63).

The human power to block 35 is applied to the working fluid evaporator (5 in the m2 diagram) inlet and outlet of the secondary power generation plant.

TD), h” (PD, TA), condenser 1 (16 in Fig. 2) construction at the inlet and outlet/Talpi h2 (Pn+8
) νhτ(PB).

Efficiency ratio η of Buyokiragarecho 2 generator (15 in Figure 2).

It is. In the blank 35, the power output W of the secondary power generation plant is calculated using the following equation (4).

W-Ch2 (FD, TA) h: (PD, TD)
h2(PB, S)+h:(Ps)]Xη, *m
o(41 where h2(PD, TA), h:(p
p, TI)), h2(PB.

S) + h, (PB), mD is Book + Tsuku 32.3
Value calculated in 3.34 or block 32.33
．． This is the property performance calculated by the device 27 from the value calculated in step 34. Generator efficiency η is given as a constant and is usually 0.96. The size block 35 may be constituted by a computer (for example, a microcomputer) and may be provided with the above-described functions.

Block 30 for searching the power generation capacity of the secondary power generation granoid by changing the pressure and temperature of the working fluid at the evaporator inlet, the temperature at the evaporator outlet, and the condenser pressure of the secondary power generation granod
is composed of a computer (for example, a microcomputer), and searches the above-mentioned parameters (such as the pressure at the evaporator inlet of the working fluid of the secondary system power generation plant) so that the secondary system generator capacity is maximized. The search method uses, for example, the maximum slope method (References: Iwanami 8h, Basic Engineering 20, Control Engineering ■).Rimari, in block 30, evaluate function J (
'In order to maximize the light kick capacity of the secondary system originating plant,
The above Nono parameter is searched by the maximum slope method.

Based on the determined operating conditions of the secondary power generation granite, the pressure and flow rate of the working fluid at the evaporator inlet of the secondary power generation plant, the condenser pressure, and the coolant flow rate of the secondary power generation plant are controlled. The device 29 for detecting pressure or flow rate is the device 6. and a device that compares the detected amount with the set value, and a device that controls the vacuum pump or pressurizer and the pump rotation speed based on the results of the comparison, and the above-mentioned parameters match the set values. control 11
Do 1.

Figure 2 shows a row in which the operating conditions for a secondary power generation plant that recovers waste heat from a primary nuclear power generation plant with an electrical output of 1100 MW using the equipment described above are determined. The pressure (Pa) at the inlet of the evaporator of fluid ammonia is 12.5 atm, and the flow rate (mD) is 6.6X10'T/H.

The pressure (PB) in the condenser is 6.0 atm, and the flow rate (m2) of water for total cooling of the condenser is 6.16×105T/H.

In addition, since the operating conditions of the working fluid of the secondary power generation plant determined by this device take into account the heat balance in the evaporator, the power generation capacity of the -secondary power plant does not change, and 100% of the exhaust heat from the power plant is utilized.

Therefore, according to the present invention, the operating conditions of the primary power generation plant, which generates a large amount of heat generation, are not changed, and the exhaust heat of the secondary power generation plant can be effectively utilized. In other words, by using the present invention, it is possible to increase the power generation output of the entire power plant, and the economic effect of implementing the present invention is significant.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a prior art example of a complex plant, Fig. 2 is a block diagram of the complex plant according to the present invention, and Fig. 3 is the operating conditions of the secondary system '3 of the complex plant according to the present invention. Figure 1 shows the configuration of the control device. Figure 4 is a diagram showing the operating conditions of the secondary power generation plant evaporator of a complex plant, and Figure 5 is a diagram showing the operating conditions of the secondary power generation plant evaporator of the complex plant. Fig. 6 is a temperature-temperature/tropy diagram showing the operating characteristics of a secondary power generation plant, and Fig. 7 is a device for calculating the heat balance of a secondary power generation plant turbine according to the present invention. Fig. 8 is a diagram showing the operating conditions of the secondary system central plant condenser,
Fig. 9 is a diagram showing an example of the configuration of a device for calculating the heat balance of a secondary system generating plant condenser according to the present invention, and Fig. 10 is a diagram showing the configuration of a device for calculating the power generation capacity of a secondary system power plant according to the present invention. Diagram showing an example. A... Evaporator r Figure 2 5) Operating characteristics at the outlet, N'
... Operating characteristics in the middle of the evaporator (5 in Figure 2), B.
...Customized operation at the outlet of the turbine (14 in Figure 2), C.
... Operating characteristics at the outlet of the condenser (16 in Figure 2), D...
・Special order for operation at the inlet of the evaporator (5 in Figure 2), D'25 No. 3 Prisoner 2 Demo 7 Eye Kaya 8 Eye 2 a No. 90 Procedural Amendment (Method), 16. B14. To 4/11be16 qshi'IJ1 Nagato Kazuo Wakasugi/It f'l's <1980 4', 'j:i'I'1(i
422 +; Name of invention Composite Pratt God 1 (name to do 1', f'l 7!: &l relation f, lI'lj'l'
j, lj1gl'1 people and' +8 (filfli
J Shu Shikizu 11 Written by Tachi Kuchi 1s1
Agent Fyama 11゛S.] 9.Contents of ``Supplementary column for a brief explanation of the drawings in the detailed description'' 1゛°,

Claims (1)

[Claims] 1. - In the 1 Summer Plant, which recovers exhaust heat from the secondary power generation plant and uses it for power generation in the secondary power generation plant,
A device that calculates the physical property values of fluids, operating conditions in the condenser of the working fluid of the secondary power generation plant (comparable to the evaporator of the secondary power generation plant), and optionality of the working fluid of the secondary power generation plant. Based on the pressure buckwheat temperature at the evaporator inlet, the temperature at the evaporator outlet, and the pressure at the condenser, and the heat balance of the turbine, evaporator, and condenser of the secondary power generation unit I, After determining the operating conditions of the working fluid of the secondary power generation plant, a device engineer that determines the sleep performance of the secondary power generation plant based on the Rankine cycle evaluation formula 1, and a secondary power generation plan] It was determined that it is a device to explore the sleep state of a secondary power plant by changing the pressure and temperature at the evaporator population of the ItII fluid, the temperature at the evaporator outlet, and the pressure at the condenser. Creation of a secondary power generation plant [Based on the spinning and turning conditions, the working fluid of the secondary photovoltaic plant is compressed at the evaporator inlet, the pressure at the condenser, and the secondary power generation plant. The cooling flow rate of the condenser on the open side 1
A plant characterized by having a device for.