JPH09196345A - Complex plant facility of incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a complex plant facility of an incinerator in which no problem may occur under any type of operating states in response to an operating condition of the facility (for example, a single operation of a gas turbine, and a combined operation of an incinerator and the gas turbine or the like). SOLUTION: There is provided a gas bypassing passage 14 in which discharged gas generated from a gas turbine 3 is fed from an outlet of a gas turbine to a location at an outlet port of a discharged gas passage downstream side of a water feeding preheater 9. There is provided a connecting passage 21 for guiding the discharged gas in the passage in a discharged gas bypassing passage from a main discharged gas passage location 16 at an intermediate position between the steam super-heater 8 and the water supplying preheater 9 to the discharged gas bypassing passage 14. As a flow passage for the discharged gas of the gas turbine ranging from the steam super-heater 8 to the discharged gas passage outlet port position, there are provided a flow passage reaching the discharged gas outlet port location through the water supplying preheater 9 and another flow passage reaching to the discharged gas passage outlet location through a part of each of the connecting passage 21 and the discharged gas bypass passage 14 in such a way that their flow passages may be freely set.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a steam generating mechanism for generating steam by heat generated in an incinerator, a steam turbine for generating power by the steam generated by the steam generating mechanism, and a steam turbine independent of the steam turbine. Gas turbine, feed water preheater for preheating feed water supplied to the steam generation mechanism using exhaust gas of the gas turbine as a heat source, steam superheater for superheating steam generated from the steam generation mechanism using exhaust gas of the gas turbine as a heat source The main exhaust gas path of the gas turbine, the steam superheater, the feed water preheater is provided from the upstream side in the stated order, on the downstream side of the water feed preheater, the exhaust gas of the incinerator and the exhaust gas of the gas turbine The present invention relates to an incinerator complex plant facility equipped with a mixer for mixing.

[0002]

2. Description of the Related Art Such incinerator complex plant equipment is
For example, an incinerator that uses municipal waste for incineration is equipped with an exhaust heat boiler, and the steam generated from this is used as a driving fluid to generate power in a steam turbine, and the power generated by a gas turbine installed in parallel with the steam turbine. Furthermore, even in the exhaust gas generated from this gas turbine, the exhaust heat of this exhaust gas is used for the preheating of the feed water supplied to the incinerator and the steam superheat of the steam supplied to the steam turbine, It is possible to perform highly efficient operation.

[0003]

In the incinerator complex plant equipment having such a structure, when recovering heat from the gas turbine exhaust gas through the steam superheater and the feed water preheater, the steam superheater is used. If the heat recovery is too large, the steam temperature will rise too high and the steam turbine in the wake will trip.
On the other hand, if the heat recovery in the feed water preheater is too large, the outlet feed water temperature rises too much, degassing performance in the downstream deaerator deteriorates, and eventually the boiler water quality deteriorates and the boiler tube Is easily corroded. Furthermore, when the gas turbine exhaust gas is passed through the steam superheater and the feedwater preheater while the incinerator is stopped (when there is no steam), the members are thermally damaged. Therefore,
An object of the present invention is to obtain an incinerator complex plant facility that does not cause a problem in any operating state according to the operating conditions of the facility (for example, gas turbine single operation, combined operation of incinerator and gas turbine, etc.). Especially.

[0004]

[Means for Solving the Problems]

(Structure) A characteristic structure of the incinerator complex plant according to the first invention of the present application for achieving this object is that exhaust gas generated from a gas turbine is directly exhausted from a gas turbine outlet to an exhaust gas passage outlet side downstream of a feed water preheater. An exhaust gas bypass passage leading to the exhaust gas bypass passage is provided, and a connecting passage for introducing exhaust gas in the passage is provided from the main exhaust gas passage portion between the steam superheater and the feedwater preheater to the exhaust gas bypass passage. As an example, as a flow path of the gas turbine exhaust gas reaching the common mixer 15) shown in FIG. 1, a flow path reaching the exhaust gas exit side through the feed water preheater, and a part of the connecting path and the exhaust gas bypass path. The flow path reaching the exhaust gas passage outlet side portion via the is freely set. (Operation / Effect) In the incinerator complex plant facility of the present application, a main exhaust gas passage and an exhaust gas bypass passage arranged in parallel therewith are provided as a system through which the exhaust gas of the gas turbine flows. Since this exhaust gas bypass passage guides the exhaust gas directly from the gas turbine outlet to the exhaust side of the equipment without passing through the steam superheater and feedwater preheater, it is possible to use the gas while the incinerator is stopped (when there is no steam). When operating only the turbine, the steam superheater and feedwater preheater are treated by introducing and treating the exhaust gas to the equipment exhaust side through the exhaust gas bypass line without flowing the gas turbine exhaust gas to the steam superheater. The equipment can be operated without causing thermal damage to the members of the feedwater preheater. Further, since the degree of superheat in the steam superheater can be adjusted by adjusting the amount of exhaust gas flowing in the main exhaust gas passage and the amount of exhaust gas flowing in the exhaust gas bypass passage, it is easy to solve the trip problem in the steam turbine. . Furthermore, between the main exhaust gas passage and the exhaust gas bypass passage,
By providing the connection passage, when the temperature of the outlet water supply of the water supply preheater exceeds a predetermined temperature (for example, 120 ° C), a part of the exhaust gas is guided from the main exhaust gas passage to the exhaust gas bypass passage side to supply water preheat. It is possible to adjust the outlet temperature of the water supply device, and solve problems such as deterioration of deaeration performance in a deaerator downstream of the feedwater preheater, deterioration of boiler water quality, and corrosion of boiler tubes.

(Structure) Furthermore, in the characteristic structure of the incinerator complex plant according to the first invention of the present application, the steam superheater is
It is preferable to provide a superheat reducer that adjusts the steam temperature at the steam superheater outlet by supplying water to the steam flowing in the steam generator or the steam at the steam superheater outlet. This is the characteristic configuration of the second invention of the present application. (Operation / Effect) The superheat of the steam in the steam superheater is performed by the heat of the gas turbine exhaust gas, but in many cases, the exhaust gas has too much heat and the superheat degree is too high. Therefore, in such a case, use the superheat reducer provided in the steam superheater to properly adjust the steam temperature at the outlet of the steam superheater to determine the state of the steam generation system (around the deaerator, around the boiler). Can be maintained well.

The above is the operation and effect when the exhaust gas bypass passage is provided for the main exhaust gas passage. A chimney for opening the outside air is provided on the downstream side of the exhaust gas passage, and the exhaust from this chimney is provided. At that time, whitening treatment is usually performed. In this case, the temperature of the exhaust gas guided to the downstream side through the main exhaust gas passage is considerably lowered, but the temperature of the exhaust gas guided through the exhaust gas bypass passage is relatively high. Therefore, the exhaust gas on the bypass side can be used for white protection. As a result, part of the exhaust gas is guided from the upstream side of the steam superheater to the exhaust gas bypass passage, or part of the gas turbine exhaust gas is guided to the exhaust gas bypass passage from the intermediate portion between the steam superheater and the feedwater preheater via the connection passage. The heat of exhaust gas can be used for whitening.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIG. The incinerator complex plant facility 1 is configured to include a pair of incinerators 2 which are No. 1 furnace and No. 2 furnace, and a gas turbine 3 which is installed in parallel with these incinerators 2. The incinerator 2 includes a steam cycle system 5 (shown by a broken line) having a steam turbine 4 including a generator 6, and the gas turbine 3 also includes the generator 6 to generate power. A configuration that can generate power is used. The steam cycle system 5 is a boiler 7 as a steam generating mechanism provided in each of the No. 1 furnace and No. 2 furnace, and steam that superheats the steam generated from these boilers 7 by the exhaust heat of the exhaust gas of the gas turbine 3. A superheater 8, a steam turbine 4 provided on the lower side of the steam superheater 8, and a feedwater preheater 9 for preheating the feedwater supplied to each boiler 7 by exhaust heat from the gas turbine 3 are mainly configured. ing. A condenser 4 is provided between the steam turbine 4 and the feed water preheater 9.
0 is provided, and a deaerator 70 is provided between the feedwater preheater 9 and the boiler 7 provided in each furnace 2. Further, as shown in FIG. 1, a bypass passage 11 is provided for the steam passage 10 passing through the steam turbine 4, and the flow rate of steam flowing through the bypass passage 11 is adjusted to adjust the steam turbine. 4 has a structure capable of adjusting the amount of steam supplied. The steam superheater 8 is provided with an overheat reducer 8a for supplying water to the steam flowing inside the steam superheater to adjust the steam temperature at the steam superheater outlet. That is, this overheat reducer 8a, as shown in the figure,
A part of the steam pipe 8b is led to the outside of the steam superheater 8 in the flow path of the exhaust gas as a heat source, and a water supply spraying mechanism 22 is provided at that portion to spray the water with steam when necessary, It is intended to adjust the temperature.

Next, the gas turbine 3 and each incinerator 2
The processing system (shown by the solid line) for the exhaust gas discharged from the vehicle will be described. Explaining the exhaust gas processing system, the exhaust gas from the gas turbine 3 and each incinerator 2 is mixed and discharged from the chimney 12a. It will be sequentially described with reference to FIG. First, the exhaust gas from the gas turbine 3 will be described. This system is prepared in three systems, and the exhaust gas from the gas turbine 3 alone is discharged to the outside via the chimney 12b, and the first exhaust gas passage 13 and the gas turbine 3 are provided. The exhaust gas of the exhaust gas is guided to the common mixer 15, white-proofed and mixed with the exhaust gas from the incinerator to the outside of the chimney 12a.
From the second exhaust gas passage 14 (this exhaust gas passage 14 is referred to as an exhaust gas bypass passage), the steam superheater 8 described above, and the feed water preheater 9 through the common mixer 15
The third exhaust gas passage 16 (this exhaust gas passage 16 is referred to as the main exhaust gas passage) is discharged from the chimney to the outside after whitening.

Further, as shown in FIG. 1, the exhaust gas from each incinerator 2 is mixed with the exhaust gas of the gas turbine 3 from the mixer 17 and the chimney 12a provided for each of the incinerators 2 and discharged. Is configured to. Explaining the above-mentioned white protection system, it is the common mixer 1
5, which is a system that is connected to 5 and that draws in outside air
8 and the discharge side of the fan 18, the common mixer 15
It is composed of a white anti-air preheater 19 provided between and.

The dampers a, b, and
c, d, e, f, g, h, i, x are provided. Here, the dampers a, b, c, d, e, f, g, h, i,
x is a steam superheater inlet damper a, a steam superheater bypass damper b, a feedwater preheater bypass damper c, a feedwater preheater outlet damper d, a common mixer white protection inlet damper e, a mixer gas turbine inlet damper f, g, a mixer inlet inlet damper h, i, and a starting duct damper x.

By adopting such an equipment configuration, in operating the incinerator 2, the gas turbine 3 can be operated in two furnace operating states, one furnace operating state, and a decommissioned state in which both furnaces are inactive. It can be realized by appropriately combining the operating state, the stopping state, the operating state of the exhaust gas temperature reducing fan 18 for white protection, the stopping state, and the like.

Now, the characteristic configuration of the present application will be described below. As described above, in the incinerator complex plant equipment 1 of the present application, the second exhaust gas passage 14 as an exhaust gas bypass passage is provided, and the main exhaust gas passage between the steam superheater 8 and the feed water preheater 9 is provided. A connecting passage 21 for guiding the exhaust gas in the passage is provided from the portion 16a of the third exhaust gas passage 16 to the exhaust gas bypass passage 14. Therefore, the steam superheater 8 reaches the common mixer 15 by the open / close selection of the steam superheater inlet damper a, the steam superheater bypass damper b, the feedwater preheater bypass damper c, and the feedwater preheater outlet damper d described above. As a gas turbine exhaust gas flow path, a flow path reaching the common mixer 15 via the feed water preheater 9 and a connection path 21
And the common mixer 1 through a part of the exhaust gas bypass passage 14
The flow paths up to 5 can be freely switched.
FIG. 2 shows a state in which only the exhaust gas bypass passage 14 is used. In FIG. 3 and FIG. 3, the part shown by the thick line shows the operated part, and the part shown by the thin line shows the not-operated part. In this case, the steam superheater bypass damper b is opened, the steam superheater inlet damper a, the feedwater preheater bypass damper c, and the feedwater preheater outlet damper d are maintained in the closed state, and the starting duct damper x is maintained in the closed state. . In this case, since the gas turbine exhaust gas has sufficient heat, the temperature reducing fan 18 can be operated and the white air preventive preheater 19 can be stopped. On the other hand, FIG. 3 shows the main exhaust gas passage 16
Is used (feed water preheater 9 and steam superheater 8 operation), further restricting the amount of gas turbine exhaust gas flowing into the feed water preheater 9 to directly supply relatively high temperature gas turbine exhaust gas, By guiding it to the common mixer 15, the exhaust gas temperature at this portion can be maintained at a predetermined temperature or higher. Similar to FIG. 2, a thick line portion indicates a portion in an operating state. In this case, the steam superheater inlet damper a, the feedwater preheater bypass damper c, the feedwater preheater outlet damper d are kept open, and the steam superheater bypass damper b is kept closed.
The starting duct damper x is kept closed. In the illustrated example, the temperature reducing fan 18 and the white air preheater 19 are both operating, but the white air preheater 19 may be operated depending on the operating condition of the furnace 2. , You may stop.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of incinerator complex plant equipment of the present application.

FIG. 2 is a diagram showing an operating state in which only a gas turbine is operated and turbine exhaust gas is directly discharged through a common mixer.

FIG. 3 is a diagram showing a state in which a gas turbine and a furnace are in an operating state, and turbine exhaust gas is discharged through a steam superheater, a feed water preheater, and an exhaust gas bypass passage.

[Explanation of symbols]

 2 incinerator 3 gas turbine 4 steam turbine 7 steam generation mechanism 8 steam superheater 8a superheat reducer 9 water supply preheater 14 exhaust gas bypass passage 16 main exhaust passage

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F22G 1/02 F22G 1/02 5/12 5/12 D

Claims (2)

[Claims] 1. A steam generating mechanism (7) for generating steam by heat generated in an incinerator (2), a steam turbine (4) for generating power by the steam generated by the steam generating mechanism (7), A gas turbine (3) independent of the steam turbine (4), a feedwater preheater (9) for preheating the feedwater supplied to the steam generation mechanism (7) by using the exhaust gas of the gas turbine (3) as a heat source, A steam superheater (8) for superheating the steam generated from the steam generation mechanism (7) using the exhaust gas of the gas turbine (3) as a heat source, and the steam is provided in the main exhaust gas passage (16) of the gas turbine (3). A superheater (8) and the feedwater preheater (9) are provided in the order listed from the upstream side, and the exhaust gas of the incinerator (2) and the exhaust gas of the gas turbine (3) are provided downstream of the feedwater preheater (9). With a mixer (17) for mixing with An incinerator complex plant facility, wherein an exhaust gas bypass passage (14) for guiding exhaust gas generated from the gas turbine (3) directly from a gas turbine outlet to an exhaust gas passage outlet side portion downstream of the feedwater preheater (9). And a connection path (21) for guiding exhaust gas from the main exhaust gas passage portion (16a) intermediate between the steam superheater (8) and the feedwater preheater (9) to the exhaust gas bypass passage (14). ) Is provided, and as a flow path of the gas turbine exhaust gas from the steam superheater (8) to the exhaust gas passage outlet side portion, a flow reaching the exhaust gas passage outlet side portion via the water supply preheater (9). A passage, the connection passage (21) and the exhaust gas bypass passage (1
An incinerator complex plant facility in which a flow path is freely set through a part of 4) and a flow path reaching the exhaust gas exit side. 2. The steam superheater (8) is provided with a superheat reducer for adjusting the steam temperature at the steam superheater outlet by supplying water to the steam flowing inside the steam superheater or the steam at the steam superheater outlet. Incinerator complex plant equipment.