JPH05271670A - Temperature control device for crude gas at crude gas cooler exit - Google Patents

Abstract

PURPOSE:To improve the thermal efficiency of a composite coal gasification and power generation plant and the desulfurization efficiency of a dry desulfurization apparatus. CONSTITUTION:An economizer 39 is installed in an evaporator 20 installed in the main body 19 of a crude gas cooler 17 through which a coal-gasification gas 8 flows. A temp. control device 42 is connected to a duct 43 connected to a gas exit pipe 24 of the cooler 17. A valve opening command signal 43 is sent from the control device 42 to a three-way valve 41 to control the opening of the valve 41 and to thereby control the amt. of water delivered from the valve 41 to the economizer 39. Thus, the temp. of the gas 8 delivered from the cooler 17 to a dry desulfurization apparatus 26 is controlled to a specified value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crude gas temperature controller for a crude gas cooler outlet.

[0002]

2. Description of the Related Art In recent years, in order to improve thermal efficiency, coal gasification gas (crude gas) generated in a coal gasification furnace is used to drive a gas turbine to generate electric power, and is also heated by the coal gasification gas to be generated. A coal gasification combined cycle power generation facility that drives a steam turbine with steam to generate power has been proposed.

A schematic flow system of the coal gasification combined cycle power generation facility is shown in FIG.

In the figure, reference numeral 1 is a coal gasification furnace, and the coal gasification furnace 1 has a gasification furnace main body 3 having a furnace chamber 2 inside and a gasification raw material provided above the gasification furnace main body 3. An inlet 4 and a coal gasification gas outlet 5 provided in the lower part of the gasification furnace body 3 are provided, and a slurry 6 of coal and water is introduced from the gasification raw material inlet 4 into the furnace chamber 2 of the gasification furnace body 3. Oxygen or air 7 is introduced and reacted, and the generated coal gasification gas 8 can be delivered downward from the coal gasification gas delivery port 5.

Reference numeral 9 denotes a first-stage crude gas cooler installed directly below the coal gasification furnace 1. The crude gas cooler 9 is housed in a cylindrical cooler body 11 having a space 10 inside and a cooler body 11. Cylindrical evaporator 12 and evaporator 12
And a cylindrical seal tower 13 connected to the lower part of the evaporator 12, and the coal gasification gas 8 descending through the space 14 in the evaporator 12 is delivered to the side of the evaporator 12 from the crude gas cooler 9. The coal gasification gas outlet pipe 15 of is connected.
The lower end of the sealing tower 13 is inserted into the sealing water 16 stored in the lower portion of the cooler body 11.

Reference numeral 17 denotes a second-stage crude gas cooler juxtaposed with the first-stage crude gas cooler 9.
Is equipped with a cylindrical cooler body 19 having a space 18 inside and a cylindrical evaporator 20 housed in the cooler body 19, and at the side of the evaporator 20 is a coal gasification of the crude gas cooler 9. A coal gasification gas inlet pipe 23 for introducing the coal gasification gas 8 sent from the gas outlet pipe 15 through the duct 21 into the space 22 in the evaporator 20 is connected. Further, a coal gasification gas outlet pipe 24 for sending out the coal gasification gas 8 that has risen through the space 22 in the evaporator 20 to the outside is connected to the upper end of the cooler body 19, and the coal gasification gas is connected. The coal gasification gas 8 delivered from the outlet pipe 24 can be delivered to the dry desulfurization device 26 via the duct 25.

Reference numeral 27 designates the water 45 sucked from the steam drum 28 via the pipeline 29 from the pipelines 30 and 31 to the evaporator 1.
2, a water supply pump 32 for supplying water 46 to the condenser 20, and water 46 sucked from the condenser 33 through the pipe line 34, and a pipe for the economizer 39 installed in the pipe line 40 and the space 22 of the evaporator 20. Road 4
4, a water feed pump that feeds the steam drum 28 via
Numerals 35 and 36 are pipes for feeding the steam generated in the evaporators 12 and 20 to the steam drum 28, and 37 is a steam drum 2
8 is a steam turbine driven by steam fed from a pipe 38. The economizer 39 is configured such that the flow direction of the fluid is from the lower side to the upper side, that is, the parallel flow, as in the flow direction of the coal gasification gas 8.

In the above coal gasification combined cycle power generation facility,
Coal and water slurry 6 and oxygen or air 7 are supplied from the gasification raw material inlet 4 into the furnace chamber 2 of the coal gasification furnace 1 to react with each other to generate a coal gasification gas 8, and the generated coal gas The gasification gas 8 is introduced into the space 14 of the evaporator 12 housed in the cooler body 11 of the crude gas cooler 9 from the furnace chamber 2 through the coal gasification gas outlet 5, and the fluid (water (And steam) while descending through the space 14,
The cooler body 1 of the crude gas cooler 17 is delivered from the coal gasification gas outlet pipe 15 to the outside of the cooler body 11 and from the duct 21.
9 is introduced into the space 22 of the evaporator 20 housed in the interior of the evaporator 20, and the space 22 is raised while heating the fluid (water and steam) flowing in the evaporator 20, and the space outside the cooler body 19 is discharged from the coal gasification gas outlet pipe 24. To the gas turbine, which is desulfurized by the dry desulfurization device 26 and is fed to a gas turbine (not shown) that has been desulfurized by the dry desulfurization device 26, and the gas turbine is driven. Coal gasification gas 8
Is discharged outside the gas turbine.

On the other hand, the water 45 sucked from the steam drum 28 into the water supply pump 27 via the pipe 29 is discharged from the water supply pump 27 and from the pipes 30 and 31 to the evaporator 1.
2, 20 and are heated by the coal gasification gas 8 while rising in the evaporators 12 and 20 to become steam, and the pipeline 3
5 and 36, and is sent to the steam drum 28 from the pipes 35 and 36, water is separated by the steam drum 28 and sent to the steam turbine 37 from the pipe 38, and the steam turbine 37 is driven. The water is sent to the post-condenser 33, condensed and returned to water, and the water 46 from the condenser 33 is sucked into the water supply pump 32 via the pipe 34, discharged from the water supply pump 32, and discharged from the pipe 40 to the economizer. 39, and is sent to the steam drum 28 via the pipe line 44.

[0010]

However, in the integrated coal gasification combined cycle power generation facility as described above, in order to improve the thermal efficiency of the entire facility and the desulfurization efficiency of the dry desulfurization unit 26, the inlet of the dry desulfurization unit 26 is improved. It is necessary to control the temperature of the coal gasification gas 8 in the range of about 400 ° C. to 450 ° C. to a constant level, but conventionally, no special temperature control has been performed, and therefore thermal efficiency and desulfurization efficiency cannot be improved. There was a problem.

In view of the above situation, the present invention has an object to provide a crude gas temperature control device at the outlet of a crude gas cooler capable of improving the thermal efficiency of the integrated coal gasification combined cycle power generation facility and the desulfurization efficiency of the dry desulfurization device. It is what you have done.

[0012]

According to the present invention, a plurality of sets of heat exchangers into which fluid to be heated is introduced from different pipes are housed in a cooler body, and the crude gas introduced into the cooler body is used for the above-mentioned purposes. Between the outlet of the crude gas cooler capable of heating the fluid to be heated in each heat exchanger and the dry desulfurization device for desulfurizing the crude gas from the crude gas cooler, the detected temperature of the crude gas and the set crude gas The deviation temperature is calculated from the temperature of
A temperature controller for outputting a valve opening command signal corresponding to the deviation temperature is provided, and the temperature controller is provided in a pipe line for supplying a fluid to be heated to any one of the plurality of heat exchangers. A control valve whose opening is adjusted by a valve opening command signal from the container is provided.

[0013]

The crude gas introduced into the cooler body heats the fluid to be heated in each heat exchanger and is fed from the crude gas cooler to the dry desulfurization device. At that time, in the temperature controller, the temperature of the crude gas is detected, and a valve opening command signal corresponding to the deviation between the temperature and the set temperature is given to the control valve to adjust the opening of the control valve. .. Therefore, the flow rate of the fluid introduced into the predetermined heat exchanger through the control valve is adjusted, and the temperature of the crude gas sent from the cooler body to the dry desulfurization device is controlled to the predetermined temperature.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
1 are the same as those in FIG. 1, and the basic configuration is the same as the conventional one shown in FIG. 3. However, the feature of the present embodiment is that in FIG. As shown, the coal gasification gas 8 at the inlet of the dry desulfurization device 26
In order to control the temperature of the water at a constant level, a three-way valve 41 is provided in the middle of a pipe 40 that feeds water from the water supply pump 32 to the economizer 39.
And a bypass pipe 47 for bypassing water to the steam drum 28 are connected to the three-way valve 41, and a temperature is provided in the middle of the duct 25 connecting the coal gasification gas outlet pipe 24 of the crude gas cooler 17 and the dry desulfurization device 26. The controller 42 is connected to the valve opening command signal 43 obtained by the temperature controller 42.
Is provided to the three-way valve 41.

In the present embodiment, the coal gasification gas 8 generated in the coal gasification furnace 1 heats the fluid in the evaporators 12 and 20 in the crude gas coolers 9 and 17, and the coal gas economizer in the crude gas cooler 17. The fluid in 39 is heated, sent out from the coal gasification gas outlet pipe 24 to the duct 25, and sent to the dry desulfurization device 26. At this time, the temperature controller 42
Detects the temperature of the coal gasification gas 8 flowing through the duct 25, obtains a deviation temperature from a preset temperature, and outputs a valve opening command signal 43 based on the deviation temperature to the three-way valve 4
1, and the opening degree of the three-way valve 41 is adjusted according to the valve opening degree command signal 43. Therefore, the water supply pump 32 is used to
The water 46 sent through 0 is divided into two directions by the three-way valve 41, and a predetermined flow rate of water 46 is sent from the pipe 40 to the economizer 39, heated by the economizer 39, and piped. It is fed from the path 44 to the steam drum 28. Therefore, the coal gasification gas 8 flowing in the duct 25 has a preset temperature (about 40
The temperature is controlled to 0 ° C. to 450 ° C. and introduced into the dry desulfurization device 26. The remaining water 46 that did not flow from the three-way valve 41 into the evaporator 39 is bypassed from the three-way valve 41 to the steam drum 28 through the bypass line 47. The flow of the water 45 flowing out from the steam drum 28 to the conduit 29 is the same as in the case of the conventional device shown in FIG.

FIG. 2 shows the temperature of water and steam at the economizer inlet portion A and the economizer outlet portion B of FIG. 1 and the coal gasification gas at the coal gasification gas inlet pipe portion X and the temperature controller connection portion Y. 8 is a graph showing the relationship of temperature, in which the solid line shows the temperature at full load and the dotted line shows the temperature at partial load.
The dotted line C shows the temperature of the water 46 and steam introduced into the economizer 39 and delivered, and the solid line B and the dotted line D show the coal gasification gas 8
Shows the temperature of. From this graph, by increasing the water flow rate Q ₁ at full load and decreasing the water flow rate Q ₂ at partial load, the temperature of the coal gasification gas 8 in the temperature controller connection Y, that is, the duct 25, flows. The temperature T of the coal gasification gas 8 fed to the dry desulfurization device 26 can be controlled to a predetermined temperature.

The heat collection amount of the economizer 39 of FIG. 1 is Q = U
It is represented by AΔT _LM . Here, U is the heat transfer coefficient of the economizer 39, A is the heat transfer area of the economizer 39, ΔT _LM is the coal gasification gas inlet pipe X of the coal gasification gas 8 and the temperature controller connection Y.
Is a logarithmic average of the temperature difference between the inlet and outlet ports A and B of the economizer and the water 46 or steam.

In the embodiment of the present invention, the case where the flows of coal gasification gas and water are made to be the counter flows has been described, but it is also possible to make them to be the parallel flows, and the crude gas cooler is 2
Although the case of providing the base has been described, one or more units may be provided, and the case of storing the economizer together with the evaporator in the second stage crude gas cooler has been described. It may be possible to store a economizer, the heat exchanger to be accommodated in the crude gas cooler is not limited to the evaporator or economizer, and the valve for adjusting the water flow rate is not limited to the three-way valve. Needless to say, the valve can be used and other various changes can be made without departing from the scope of the present invention.

[0020]

As described above, according to the crude gas temperature control device for the crude gas cooler outlet of the present invention, the thermal efficiency of the integrated coal gasification combined cycle facility is improved and the desulfurization efficiency of the dry desulfurization device is also improved. Various excellent effects can be achieved.

[Brief description of drawings]

FIG. 1 is a flow system diagram of one embodiment of an integrated coal gasification combined cycle power generation facility to which a crude gas temperature control device at a crude gas cooler outlet of the present invention is applied.

FIG. 2 is a graph showing the relationship between the temperature of coal gasification gas and the temperature of water or steam when the temperature of coal gasification gas is controlled by the crude gas temperature control device at the crude gas cooler outlet of the present invention.

FIG. 3 is a flow system diagram of an ordinary integrated coal gasification combined cycle facility.

[Explanation of symbols]

 8 Coal gasification gas (crude gas) 17 Crude gas cooler 19 Cooler body 20 Evaporator (heat exchanger) 24 Coal gasification gas outlet pipe (outlet) 26 Dry desulfurization equipment 31 Pipeline 39 Coal saver 40 Pipeline 41 Three-way valve (Control valve) 42 Temperature controller 43 Valve opening command signal 45 Water (fluid to be heated) 46 Water (fluid to be heated) 47 Bypass pipeline

Claims (1)

[Claims] 1. A plurality of sets of heat exchangers, into which fluids to be heated are introduced from different pipes, are housed in the cooler body, and heated in each of the heat exchangers by the crude gas introduced into the cooler body. Between the outlet of the crude gas cooler capable of heating the fluid and the dry desulfurization device for desulfurizing the crude gas from the crude gas cooler, the deviation temperature is obtained from the detected temperature of the crude gas and the temperature of the set crude gas. , A temperature controller that outputs a valve opening command signal corresponding to the deviation temperature is provided, and the temperature is provided in a conduit for supplying a fluid to be heated to any one of the plurality of heat exchangers. A crude gas temperature control device at a crude gas cooler outlet, comprising a control valve whose opening is adjusted by a valve opening command signal from a regulator.