JPS6075704A - Thermal generating system - Google Patents

Abstract

PURPOSE:To suppress fluctuation of pressure within a condenser by giving fluctuation of flow rate of ultra-cold liquid gas as a feed forward signal to an adjusting-meter of a flow rate of heat medium vaporized gas which enters the condenser through direct bypass from a gas vaporizer for heat medium. CONSTITUTION:The captioned system has a gas vaporizer 1 in which liquid gas for heat medium, for example, LPG is vaporized by sea water, and a condenser 2 in which used heat medium vaporized gas coming out of a turbine TB1 is cooled and liquidized by ultra-cold liquid gas, for example, LNG. In this case, an adjusting-meter C1 which adjusts a turbine bypass valve V3 that introduces a part of the heat medium vaporized gas directly to the condenser 2 without introducing it to the turbine TB1 is provided. And by this adjusting-meter C1, the bypass valve V3 is controlled by a feed-forward signal obtained based on a detected pressure in the condenser 2 by a pressure detector 11, the most suitable set value by a function generator 12, and fluctuation of flow rate at an LNG entrance portion by an LNG flow rate detector 13.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a cryo-thermal light mountain system using a circulating action of liquefied gas for a heating medium. Applying as a feed A word signal to the adjustment t1 that adjusts the flow of heat medium vaporized waste directly bypassing from the medium gas hebalizer to the condenser;
This invention relates to a cold power generation system that improves controllability by minimizing pressure fluctuations in a continuum.

[Prior Art] In recent years, a so-called cold energy power generation system that uses the pressure of a heating medium (liquefied gas) to turn a cast turbine and generate electricity has been in the spotlight. Figure 1 shows an example of this conventional system. This is a configuration diagram. In the figure, reference numeral 43 denotes a heat medium liquefied gas vaporizer (hereinafter simply referred to as a casseverary) that vaporizes a heat medium liquefied gas by passing tl+j water through it, and the gas vaporizer includes: The system is equipped with a system through which seawater can pass, allowing heat exchange to take place. 2 is mainly used to transport the vaporized waste of the spent heat medium used to rotate the turbine and the ultra-low-temperature liquefied waste. There is a heat medium waste capacitor (hereinafter simply referred to as "Contin 1") C that liquefies again when passing through it. Inside the condenser, ultra-low temperature liquefied gas piping is installed to liquefy the used waste. Here, as the heating medium gas, for example, 1-PG (propane gas) or an ultra-low temperature liquefied gas, such as LNG, is used as C. 3 is the 1ζ pump that circulates the heating medium gas, and 4 is the 1-CiMa 'd'l scum (below!
71 is a primary warmer that heats seawater (LNG) by passing it through the primary warmer; This is a secondary humidifier that heats the NG.

The LNG tJ thus humidified and vaporized is completely gasified and supplied from Ii IN to consumers. T
2C is vaporized heating medium gas (abbreviated as LPG)! The first turbine, Ta2, is rotated by air (I).
The second turbine (V+i, l) which is rotated using a part of the heated 1,, N G
Shutoff valve that shuts off 1, V2f, i turbine 1'B
+ entry 1] section (Turbine nozzle, V31
; Installed in the bypass path of L gasification LPG (J and Iζ turbine bypass valve, v4 installed in the path of vaporization LNG)
The turbine canal isolation valve v5 is connected to the second turbine 132
The turbine nozzle, ■6, installed at the entrance of 1. N
V7 is a turbine bypass valve installed at the inlet of gas turbine G, V8 is a pump bypass valve, and V8 is a pump bypass valve. The photoelectric effect is performed in the first turbine TB+ as a raw material, and Ta2 is an auxiliary one.The flow directions of LNG and IPG are indicated in the figure. The operation is explained below.

This system is a kind of
L
PG circulates within the system, and LNG is vaporized and sent out as a product. As a form of luck Φh, TRIEX (
) - RYEX) and POWE
There is a second mode called REX (Pa1 Flex). The first 7-1 to 7-1 do not generate electricity but only discharge waste. That is, the flow m adjustment nozzle v6 adjusts the flow
The LNG that has been released will pass through one condenser 2.
At the same time, the LNG itself is heated. After that, L
, NG is based on primary warmer 4.secondary warmer 5 CJJ11
! Product pressure increase (iFj J, -) (LN because it is heated
G is vaporized and sent out from the system to be supplied to consumers. In this case, the critical valve with turbine 1]
4 has a total of 111.

The ING pressure in the system is constantly rolled by the turbine bypass valve V7. 1-PG, which has been converted into Cd in the condenser 2, passes through the pump bypass valve Vs and enters the shaparizer 1, and is vaporized by the seawater flowing inside it.The vaporized propane gas IJ passes through the turbine bypass valve v3. Then, it returns to the condenser 2 again.The shutoff valve V and +1 at the inlet of the turbine block B1 are fully open.At this time, the pump 3 is stopped and the pumps 13 and 12G are in natural circulation. +#J *+, I: 1. , N.G.

It is used to heat LPG and vaporize it.

Therefore, L-F of 'j2 generates electricity and there is one C. That is, at this time, (1; pump 3) operates, the turbine bypass valve v3 is throttled, and the
Compared to that of (7), the J1 force in the direction from the beaten vaporizer 1 to 2 becomes stronger,
The pressure horn from the capacitor 2 toward the vaporizer 1 weakens. Therefore, a circulation pump 3 is required. Condesiri 2
Since the inner tube continues to condense through heat exchange with LNG, the IF force of the condenser can be controlled by the throttle of the turbine bypass valve ■3. Pump bypass valve V8 is fully closed and J3 is closed.
This state is called reduced pressure operation. Here, turbine-rL3
+, l'B2 inlet isolation valve V1. Open V4 Lr
/＼-The scraped residue is transferred to each turbine.
It flows in quickly and becomes a power generating state. During such a reduced pressure operating state, Jj is adjusted to control the turbine bypass valve V3.
Ii5 it (not shown) controls the power of the condenser 2 by controlling the turbine bypass valve V3; Fluctuations in the flow rate (a slight disturbance occurs. In other words, L N G 71 L Wk wo increases a-ti lever: ] N J- N 4t 2 0) The condensation speed increases and the pressure decreases. to On the other hand, if you reduce the LNG flow, the condensation speed will decrease and the power will be reduced to 11.
,・)tJ4? Zuru. In order to stabilize the generated power or to lower the temperature inside the capacitor (11), if the power decreases, the pressure inside the capacitor decreases and becomes extremely low (F
This will reduce the vaporization efficiency of liquefied gas.
The pressure of the liquefied gas for the heating medium inside the engine must be constantly controlled during photoelectric operation. On the other hand, the ultra-low temperature liquefied waste flow m cannot be freely controlled to increase or decrease in response to fluctuations caused by changes in the amount of waste used. The rapid condensation of the heating medium gas causes a pressure effect.On the contrary, the ultra-low temperature liquefaction power rapidly decreases (31 The condensation speed of the heating medium gas is lowered, and the heat flowing into the denza is reduced). The pressure caused by the medium gas leads to a shift. Therefore, during depressurization, the negative IX: 1 fluctuation, the diversion change causes the flow to become unstable in the Jf fit.
Ru. The response of the = 1 tensa pressure to the movement of the Tajshiba and Ipassburr V3 is yes, if so, close the bypass valve] 1 nden 4 no naizo '', -) C Because there is a delay factor such as the time required for condensation, there is (゛) Therefore, 1.
I need to work.

[Object of the invention] The present invention has been made in view of the above points, and i=thing τ
, by giving the fluctuations in the LNG flow rate as a feedforward signal to the adjustment h1 that constitutes the LPG flow adjustment system that adjusts the LPG flow rate in the bypass path, controllability is improved and a cold heat power generation system that eliminates the above-mentioned problems is realized. This has been achieved.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

[Structure of the invention] FIG. 2 shows an embodiment of the present invention and is a block diagram C.

The same numbers as in Fig. 1 are indicated by "f" in Fig. J0. 1]-υ detector, the output of the pressure detector is applied as a measured value PV to the first adjustment δ1. Reference numeral 12 denotes a function generator that provides the first controller with an optimum set value at the time of depressurization or at the time of low pressure.

13 is installed at the LNG entrance (JI3 1,, N
A flow rate detector that detects G diversion, 'I /I i; As a feedforward signal, + and λ are applied to C. C2 is a second adjustment a1 that adjusts the flow rate of vaporized LPG flowing into the turbine TB+, and its output drives the turbine nozzle V2.

Summary of the present invention: First adjustment 81C4 for adjusting the bypass flow rate of LPG by changing the flow rate at the U L N G inlet.
There is a saying that ``node t-1-noA'' is called ``LJk''. This way 'J L: ti' + formation 1 + 7.71 If we explain the operation of placing the node, we have C' as follows.

The operation when there is no note 1 to 11 (1) is clear. 1. In this state, the first adjustment glC+ fil and the control CI' of the turbine bypass valve rV3 are performed. However, for this first point, fluctuations in the LNG flow rate will result in two disturbances. That is, LN
If the G flow rate is increased, the propane condensation concentration in 4J2 will increase, and the 11 force will become lower. On the other hand, if the LNG flow rate is reduced, the condensate concentration will decrease and the pressure will decrease.

It keeps rising for the sake of the song.

Next, the control in the LPG gas condenser 2 will be described. During depressurization operation, if the N G flow rate is increased, condensation of L'PG (71) in the condenser 2 progresses, and the pressure follows a downward trend, resulting in l N G F & fli
If you reduce the amount of waste flowing into the gas vaporizer 1, J and C will be reduced.
Condenry 2 pressure follows an upward trend. Follow-C,
It is effective to control the LNG flow rate to the turbine bypass valve rV3.

According to the present invention, if 1+, 1. If the NG flow rate is constant, the turbine bypass valve V3 will be set to = 1 nbun (21 nt D-/ for monthly fluctuations). Depending on the number +, K
15<Turbine bypass valve v3 can be controlled from 1 to 1 to suppress pressure fluctuations in condenser 2. in general,
Only II'i +fJ (・ha=
Pressure control is difficult due to the large dead time due to the presence of the 1-1 to 1-1 loop. However, by performing the main 1J filter 9t disturbance C (feet) using the diversion fluctuation signal of 41, the pressure in 2 Fluctuations can be stabilized to speed 1b. The explanation above is based on the case where C is used as an example of liquefied waste for heat medium and l-NG is used as ultra-low temperature d liquefied waste. The species jQ O) The liquefied scum is only one ζ-.

[Effects of the Invention] As explained in detail in step 1, the present invention provides L14
G (111 fluctuations constitute the IPG flow hanging flow li system J DOl:il as a node A word signal -C5 and every 15 times J, Sun1ll 1jll 4'l Dai IJ, j rikotoga-C
Wear.

[Brief explanation of the drawing]

Fig. 1 shows an example of an IJ promotion system, a) Fig. 2 (according to an embodiment of the present invention) - 41 to form 1. 1... Heat medium waste l\- Validity, 2...Heat medium 11-1-1-13...Circulation, +in/゛, 4,5...Warmer, 11...1 Force detector, 12...
...Function generator 11, 13...Flow is the detector, '14...
Instruction lit, C1, C2...adjustment nozzle, V3. V6
...Flow rate adjustment nozzle, V7...Turbine bypass valve, V6...Bonzo bypass valve.

Claims (1)

[Claims] The liquefied waste for heating medium is heated with seawater and vaporized, and the pressure of the vaporized waste generated at that time rotates the turbine. In the cold power generation system configured as above, a part of the vaporized heat medium residue is passed through the turbine. 89 +, t
, detects the pressure fluctuation of the heating medium cassette 4-C
A flow a K that adjusts the vaporized gas flow m flowing through the path.
A cryogenic power generation system characterized in that a fluctuation in the flow rate of ultra-low temperature liquefied gas is used as a foot forward signal to give -C to f4 no al.