JPH10274007A - Method for supplying steam to coke dry type fire extinguishing facilities and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a power generating rate utilizing each facility capacity effectively by assembling reserve of boiler facility steam in power generating facility, and reserve of a CDQ (coke dry type fire extinguishing) turbine facility power generation when a coke producing rate is lower than facility capacity, in the CDQ power generating facility. SOLUTION: A CDQ turbine 6 has an allowance comparing with normal operation generally, and has recipient reserve of steam. A steam piping 19, a steam pressure (a flow rate) controlling valve 20, a temperature reducer 21, and a water filling spray control valve 22 are arranged in order to supply a differential rate between a steam supplying rate setting value of a boiler 9 for a power generator and a steam supplying rate of a turbine 11 for a power generator, and by a controller 25 the steam supplied from the boiler 9 for the power generator into the CDQ turbine 6 is controlled. Condensation corresponding to steam is returned into a condensate line of a power generating facility by a condensate piping 23 and a condensate control valve 24. As a result, it is possible to increase a power generating rate by supplying reserve of the steam generating rate of the boiler 9 for the power generator into the CDQ turbine 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for supplying steam to a coke dry-fire extinguishing system, and more particularly, to the use of steam generated from a waste heat boiler of a coke dry-fire extinguishing system (hereinafter referred to as a CDQ waste heat boiler). The present invention relates to a method and apparatus for supplying steam.

[0002]

2. Description of the Related Art Conventionally, generally, a CDQ power generation facility and a generally used power generation facility are usually independent facilities as shown in FIG. That is, FIG.
It is a figure which shows the use situation of the power generation equipment and the power generation equipment generally used. As shown in FIG. 2A, each of the CDQ power generation facilities is a single facility, and the CDQ waste heat boiler 5 is connected to the CDQ turbine 6 via a steam control valve 26 via a steam pipe. 7 are connected. In this way, the steam generated from the CDQ waste heat boiler 5 is guided to the CDQ turbine 6 through the steam pipe and the blower control valve 26. The steam used for the generator turbine is cooled by the condenser 12 and replenished with water from the make-up water facility, and the low-pressure feed water heater 16-1 is supplied by the condenser pump 36.
After heating, the air is deaerated by the deaerator 28, supplied to the high-pressure feed water heater 16-2 by the boiler feed pump 27, heated, and circulated again to the CDQ waste heat boiler 5.

Further, as shown in FIG. 2 (b), generally used power generating equipment is also configured to be recirculated through a route similar to that of FIG. 2 (a). Thus CDQ
Since the facility and the power generation facility are each operated by a single facility, the actual situation is that the spare capacity of the CDQ turbine facility and the boiler capacity of the power generation facility are not used.

Therefore, for example, Japanese Utility Model Application Laid-Open No. 58-177504.
The steam supply device of the blast furnace blower turbine shown in
Usually, the steam of the CDQ waste heat boiler, which has a large variation in the amount of steam generated, is used for a blast furnace blower required to operate stably. As shown in FIG. 3, the steam generated from the CDQ waste heat boiler 5 is If the amount of steam is larger than the required amount of steam from the blast furnace blower, the excess steam is sent to the turbine 29 for the generator.
When the generated steam from the CDQ waste heat boiler 5 is smaller than the required steam amount of the blast furnace blower, the fuel-fired boiler 31 is operated to supply the shortage. ing.

As described above, the turbine 29 for fuel, the boiler 31 for cooking fuel, and the extraction device 35 are operated to operate the turbine 32, 32a for the blast furnace blower and the steam main pipe 33 in response to the fluctuation of the CDQ waste heat boiler 5. When the automatic operation is performed so that the steam pressure of the blast furnace becomes constant, the blast furnace blowers 34 and 34a can be operated stably by the so-called pressure regulating operation control, even though the fluctuating steam of the CDQ waste heat boiler 5 is used. Therefore, by arranging the generator turbine 29, the fuel-cooking boiler 31, and the extraction device 35 in the main steam pipe 33, stable operation of the steam of the CDQ waste heat boiler 5, which usually has large fluctuations in the amount of generated steam, is required. It can be used for blast furnace blowers.

[0006]

When the above-described CDQ power generation facility and the power generation facility are each a single facility, there is a problem that the remaining capacity of the CDQ turbine facility and the remaining boiler capacity of the power generation facility are not used. In addition, the actual opening 58-17
In the case of Japanese Patent No. 7504, stable operation of the steam of the CDQ boiler, which generally has a large variation in steam generation amount, is possible by arranging the generator turbine, the fuel-cooking boiler, and the extraction device in the main steam pipe. ,However,
In general, when shutting down due to the relationship with the coke production volume of CDQ boilers used for blast furnace blowers and legal compliance (periodic inspection), all of them must rely on fuel-fired boiler equipment. The fuel-fired boiler equipment must be provided with equipment corresponding to the blast furnace air flow, which causes a problem that the equipment becomes large and the equipment cost increases.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have made intensive developments, and as a result, provide a steam supply method and apparatus capable of utilizing steam generated from a waste heat boiler of a coke dry fire extinguishing system. Things. The gist of the invention is as follows: (1) In a method of supplying steam to a coke dry-fire extinguishing system, a CDQ turbine facility has a surplus power generation capacity when a coke production amount serving as a heat source in the CDQ power generation facility is reduced below the facility capacity, and A method for supplying steam to a coke dry fire extinguishing facility, characterized in that the amount of power generation is increased by utilizing the remaining boiler steam capacity of the facility.

(2) In a device for supplying steam to a coke dry fire extinguishing facility, a steam pipe for supplying from a power generating facility to a CDQ power generating facility is connected, and
Q: Install a steam supply control device for power generation equipment, and
The condensate supply from the Q power generation facility is controlled by a condensate pipe to the power generation facility.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a use situation where a CDQ power generation facility and a power generation facility according to the present invention are integrally connected. As shown in FIG. 1, red hot coke of about 1050 ° C. fired in a coke oven is conveyed in a coke car 1 and charged from the upper part of a coke dry fire extinguishing system 2 and extinguished to a temperature of about 250 ° C. To obtain coke 3 as a product. On the other hand, at the same time as the coke is dry-fired in the coke dry-fire extinguishing facility 2, the waste heat steam passes through the dust remover 4, and the steam is sent from the CDQ waste heat boiler 5 to the CDQ turbine 6 to operate the generator 7. The circulating gas (N ₂ ) blown into the coke dry fire extinguisher 2 is taken out from the lower part of the CDQ waste heat boiler 5 and is blown again from the lower part of the coke dry fire extinguisher 2 through the cyclone 8 to be used as the circulating gas. Is done.

On the other hand, in a commonly used generator facility, steam generated from a generator boiler 9 is guided to a generator turbine 11 through a steam pipe through a blower control valve 10. The steam used in the generator turbine 11 is cooled by the condenser 12, and the pure water device 13 and the tank 14 are cooled.
The replenishing water is supplied by the replenishing water pump 15 and the feed water
-1, 16-2, heated and circulated again to the generator boiler 9. Reference numeral 17 denotes a pure water tank;
Is a deaerator.

Therefore, in the present invention, in order to effectively utilize the remaining steam supply capacity of the generator boiler 9, the difference of (boiler steam supply amount set value) − (generator turbine steam supply amount) is calculated by using the CDQ turbine 6. Pipe 19, steam pressure (flow rate) control valve 20, and temperature reducer 21,
Install the water injection spray control valve 22 and install CDQ
The steam supply to the turbine 6 is controlled by the steam pressure (flow rate) steam temperature. The steam pressure (flow rate) control valve 20 controls the CD.
The condensed water corresponding to the steam injected into the Q-side turbine 6 is returned to the condensate line of the power generation facility by the condensate piping 23 and the condensate control valve 24.

Therefore, regarding the boiler capacity of boilers, turbines, and generator facilities which are generally used power generation facilities, it is desirable that the steam supply amount of the boiler facility and the steam capacity (power generation output) of the turbine facility are equal. Generally, the boiler installed capacity is larger than the turbine installed capacity.
The reason is a margin for boiler design and production errors,
In addition, the deterioration of turbine equipment over time (condenser, water supply superheater, etc.) due to the increase in steam volume due to tube contamination, etc., and the increase in the amount of steam used for superheating when supplying make-up water for condensate water (transient phenomenon). Is due to an increase in steam volume due to a decrease in turbine efficiency due to an increase in the temperature of the cooling water of the turbine condenser (eg, in summer). For these reasons, the steam supply capacity of the boiler facility has a large relationship with the steam capacity (power generation output) of the turbine facility. Because of these relationships, the boiler of the power generation facility has the capacity to supply steam.

On the other hand, in the operation of the CDQ, since the CDQ equipment is designed to have the maximum capacity of the red hot coke processing capacity, the capacity of the turbine of the CDQ equipment is provided with a margin of several% to 10% as compared with the normal operation. It is. Since the red hot coke processing of CDQ is a batch processing, the amount of generated steam varies. Further, the load factor of the CDQ is lower than that of the general power generation equipment due to a decrease in the amount of coke treatment and the like, and the turbine of the CDQ has a surplus steam receiving capacity. On the other hand, the load (steam generation amount) of the power generation equipment is ± 5% / min at a high load (70 to 100%) even in the case of coal-fired boiler equipment, which has poor load following ability compared to gas-fired boiler equipment. The supply of steam to the plant can be fully supported. Therefore, the amount of power generation can be increased by supplying the margin of the steam generation amount of the boiler of the power generation equipment to the CDQ turbine.

[0014]

FIG. 1 shows a control mechanism of a steam pressure (flow rate) control valve according to the present invention. In FIG. 1, an inlet of a CDQ turbine 6 for effectively utilizing a steam supply surplus of a generator boiler 9 is shown. The secondary pressure of the steam pressure (flow rate) control valve 20 is set several kg / cm ² higher than the steam pressure set value, and the (generator boiler 9 steam supply set value)
The control valve opening upper limit is set by CDQ steam supply amount control such that (generator turbine 11 steam supply amount) ≧ (CDQ steam supply amount). That is, the difference of (boiler steam supply amount)-(generator steam supply amount) is calculated as CDQ.
A steam pipe 19, a steam pressure (flow rate) control valve 20, a desuperheater 21, and a water injection spray control valve 22 are installed in order to supply the steam to the turbine 6. Flow) control the steam temperature. The CDQ is controlled by the steam pressure (flow rate) control valve 20.
The condensate corresponding to the steam injected into the side turbine 6 is returned to the condensate line of the power generation facility by the condensate pipe 23 and the condensate control valve 24.

[0015]

As described above, the boiler equipment for a generator generally used in the past cannot be utilized for power generation up to the full capacity of the equipment, but by combining with the turbine equipment of the CDQ equipment according to the present invention. Thus, it is possible to effectively utilize each of the equipment capacities and to achieve an extremely excellent effect of increasing the amount of power generation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a use situation where a CDQ power generation facility and a power generation facility according to the present invention are integrally connected.

FIG. 2 is a diagram showing a usage state of a conventional CDQ power generation facility and a power generation facility generally used.

FIG. 3 is a layout diagram of a conventional steam supply device for a blast furnace blower turbine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 coke car 2 coke dry fire extinguishing equipment 3 coke 4 dust remover 5 CDQ waste heat boiler 6 CDQ turbine 7 generator 8 cyclone 9 generator boiler 10 blower control valve 11 generator turbine 12 condenser 13 pure water device 14 tank 15 makeup water pump 16 makeup water equipment 16-1 low pressure feed water heater 16-2 high pressure feed water heater 17 pure water tank 18, 28 deaerator 19 steam piping 20 steam pressure (flow) control valve 21 desuperheater 22 water injection spray Control valve 23 Condensate pipe 24 Condensate control valve 25 Controller 26 Blower control valve 27 Boiler feed pump 29 Turbine for generator 30 Low pressure steam line 31 Fuel-fired boiler 32, 32a Turbine for blast furnace blower 33 Steam main pipe 34, 34a Blast furnace blower 35 Extractor 36 Condenser pump

Claims (2)

[Claims] 1. A method for supplying steam to a coke dry-fire extinguishing system, comprising: determining a surplus power generation capacity of a CDQ turbine facility when a production amount of coke serving as a heat source in the CDQ power generation facility is reduced below the facility capacity; A method for supplying steam to coke dry fire extinguishing equipment, characterized in that the power generation is increased by utilizing the power. 2. An apparatus for supplying steam to a coke dry fire extinguishing facility, wherein a steam pipe for supplying steam from the power generating facility to the CDQ power generating facility is connected, and a steam supply amount control device from the power generating facility to the CDQ power generating facility is provided. And steam condensing equipment for coke dry-type fire extinguishing equipment, wherein condensed water from the CDQ power generation equipment is condensed and supplied to the power generation equipment using condensate piping.