Pulverized fuel supply device, gasification furnace facility, gasification combined power generation facility, and method for controlling pulverized fuel supply device
阅读说明:本技术 粉体燃料供给装置、气化炉设备及气化复合发电设备以及粉体燃料供给装置的控制方法 (Pulverized fuel supply device, gasification furnace facility, gasification combined power generation facility, and method for controlling pulverized fuel supply device ) 是由 浦方悠一郎 西村幸治 葛西润 于 2019-02-12 设计创作,主要内容包括:具备:分配器(84),将被供给的粉体燃料向多个分支管(82)分支;多个燃烧器(126a),连接于多个分支管(82)各自的下游端(82a),向使粉体燃料气化的气化炉内供给煤焦;流量喷嘴(85),设于多个分支管(82)中的各分支管,对分支管(82)内的煤焦流施加压力损失;差压计(86),计测因流量喷嘴(85)而产生的差压;及控制部,基于由差压计(86)得到的差压来判断煤焦流流速的下降。(The disclosed device is provided with: a distributor (84) for branching the supplied pulverized fuel to a plurality of branch pipes (82); a plurality of burners (126a) connected to the downstream ends (82a) of the plurality of branch pipes (82) and configured to supply char into the gasification furnace for gasifying the pulverized fuel; a flow rate nozzle (85) provided in each of the plurality of branch pipes (82) and configured to apply a pressure loss to the coal char flow in the branch pipe (82); a differential pressure gauge (86) for measuring a differential pressure generated by the flow nozzle (85); and a control unit for determining a decrease in the flow rate of the coal char stream on the basis of the differential pressure obtained by the differential pressure gauge (86).)
1. A pulverized fuel supply device is provided with:
a distributor for branching the supplied pulverized fuel to a plurality of branch pipes;
a plurality of burners connected to downstream ends of the branch pipes, for supplying pulverized fuel into a gasification furnace for gasifying the pulverized fuel;
a resistance body provided in each of the plurality of branch pipes, the resistance body applying a pressure loss to the powder fuel flow in the branch pipe;
a pressure loss measuring means for measuring a differential pressure generated by the resistor; and
and a control unit that determines a decrease in the flow velocity of the pulverized fuel based on the differential pressure.
2. The pulverized fuel supply apparatus according to claim 1, wherein,
the pulverized fuel supply device is provided with:
an inert gas additional supply means for additionally supplying an inert gas to the pulverized fuel flow flowing through the distributor together with the fine fuel powder; and
and a control unit that increases a flow rate of the inert gas additionally supplied from the inert gas additional supply means when it is determined based on the differential pressure that the flow rate of the pulverized fuel flowing through the branch pipe has decreased.
3. A pulverized fuel supply device is provided with:
a distributor for branching the supplied pulverized fuel to a plurality of branch pipes;
a plurality of burners connected to downstream ends of the branch pipes, for supplying pulverized fuel into a gasification furnace for gasifying the pulverized fuel;
a temperature measuring unit that measures a downstream end temperature at the downstream end of the branch pipe; and
and a control unit that determines a decrease in the flow velocity of the pulverized fuel based on the downstream end temperature.
4. The pulverized fuel supply apparatus according to claim 3, wherein,
the pulverized fuel supply device is provided with:
an inert gas additional supply means for additionally supplying an inert gas to the pulverized fuel flow flowing through the distributor together with the fine fuel powder; and
and a control unit configured to increase a flow rate of the inert gas additionally supplied from the inert gas additional supply unit when it is determined based on the downstream end temperature that the flow rate of the pulverized fuel flowing through the branch pipe is decreased.
5. The pulverized fuel supply apparatus according to any one of claims 1 to 4, wherein,
a pulverized fuel density measuring means for measuring the density of the pulverized fuel is provided in the branch pipe.
6. A gasification furnace facility is provided with:
the pulverized fuel supply apparatus according to any one of claims 1 to 5; and
and a gasification furnace to which the pulverized fuel is supplied from the pulverized fuel supply device.
7. A gasification combined cycle power plant is provided with:
the gasifier apparatus of claim 6;
a gas turbine that is rotationally driven by burning at least a part of the generated gas generated in the gasification furnace facility;
a steam turbine that is rotationally driven by steam generated in an exhaust heat recovery boiler into which turbine exhaust gas discharged from the gas turbine is introduced; and
an electrical generator rotationally coupled to the gas turbine and/or the steam turbine.
8. A method for controlling a pulverized fuel supply device, the pulverized fuel supply device comprising:
a distributor for branching the supplied pulverized fuel to a plurality of branch pipes;
a plurality of burners connected to downstream ends of the branch pipes, for supplying pulverized fuel into a gasification furnace for gasifying the pulverized fuel;
a resistance body provided in each of the plurality of branch pipes, the resistance body applying a pressure loss to the powder fuel flow in the branch pipe; and
a pressure loss measuring means for measuring a differential pressure generated by the resistor,
wherein the control method determines a decrease in the flow rate of the pulverized fuel based on the differential pressure.
9. A method for controlling a pulverized fuel supply device, the pulverized fuel supply device comprising:
a distributor for branching the supplied pulverized fuel to a plurality of branch pipes;
a plurality of burners connected to downstream ends of the branch pipes, for supplying pulverized fuel into a gasification furnace for gasifying the pulverized fuel; and
a temperature measuring unit that measures a temperature of a downstream end portion at the downstream end of the branch pipe,
wherein the control method determines a decrease in the flow rate of the pulverized fuel based on the downstream end portion temperature.
Technical Field
The present invention relates to a pulverized fuel supply device for supplying pulverized fuel into a gasification furnace, a gasification furnace facility, a gasification combined cycle power generation facility, and a method for controlling the pulverized fuel supply device.
Background
Conventionally, as a gasification furnace facility, a carbon-containing fuel gasification facility (coal gasification facility) is known, which generates a combustible gas by supplying a carbon-containing solid fuel such as coal into a gasification furnace and partially combusting and gasifying the carbon-containing solid fuel. Hereinafter, a case of using coal as an example of the carbonaceous solid fuel will be described.
A fuel supply device is known as a coal gasifier facility, which supplies pulverized fuel such as pulverized coal or char (powder composed of unreacted coal and ash) into a gasifier together with nitrogen (inert gas) (for example, patent document 1).
Disclosure of Invention
Problems to be solved by the invention
When pulverized coal is used as a fuel for gasification, the amount of coal char produced varies depending on the properties of the coal or the like (carbon-containing solid fuel) used. When the amount of char changes while the char is being transported to the gasification furnace by an inert gas such as nitrogen, the flow rate of the char supplied to the gasification furnace may change. Therefore, the flow rate in the char transport pipe fluctuates and the operation is performed.
In order to convey pulverized fuel such as char and pulverized coal, it is necessary to convey the pulverized fuel at a flow rate of a predetermined value or more so as to prevent the pulverized fuel from settling in the conveying pipe and making the conveyance unstable. In particular, when the coal supplied to the gasification furnace is set to a plurality of coal types and the operation is performed while switching the coal types, the flow rate of the char may change depending on the coal type due to a change in the char amount. When the flow rate during transportation of the char is low, the char may settle by gravity in the transportation pipe, and transportation failure may occur. Therefore, it is desirable to reliably detect a decrease in the flow velocity during transportation of char, which causes a transportation failure of char.
Further, it is necessary to consider influence in the case where the flow rate during transportation of the char is slow. That is, when a conveyance failure due to the deposition of char in the char conveying pipe occurs, the char conveying pipe may be cleaned. Since the cleaning is performed by temporarily stopping the conveyance of the char, the influence of the radiation from the inside of the gasification furnace on the burner tip becomes large. This is because, during normal operation, the flow of the char powder ejected from the burner tip toward the gasification furnace is a curtain, and radiation from the furnace to the burner tip is blocked. Therefore, when the transportation of the char is stopped, the temperature of the burner tip rises and the consumption of the burner tip is accelerated. When the burner tip is worn, the injection angle of the burner jet spreading from the burner tip becomes large, and the fine fuel jet discharged from the burner contacts the burner cooling pipe wound around the outer periphery of the burner tip, and thus, if the wear is advanced beyond the normal operation condition, wear leakage may occur. Therefore, when the transportation of the char is defective, it is desirable to recover the flow velocity during the transportation of the char in consideration of the influence until the consumption of the burner tip is suppressed.
The above-described problem concerning the transportation failure of the char is also similar to the transportation failure of other pulverized fuel such as pulverized coal.
The pulverized fuel supply device, the gasification furnace facility, the combined gasification power generation facility, and the method for controlling the pulverized fuel supply device according to the present disclosure are made in view of the above circumstances, and an object thereof is to reliably detect a decrease in the flow velocity of the pulverized fuel, which is a factor causing a transportation failure of the pulverized fuel in the transportation pipe.
Further, the pulverized fuel supply device, the gasification furnace facility, the combined gasification power generation facility, and the method for controlling the pulverized fuel supply device according to the present disclosure are intended to suppress depletion of the furnace inner side tip of the burner and recover from a drop in the pulverized fuel flow rate when a failure in conveyance of the pulverized fuel occurs.
Means for solving the problems
A pulverized fuel supply device according to an aspect of the present disclosure includes: a distributor for branching the supplied pulverized fuel to a plurality of branch pipes; a plurality of burners connected to downstream ends of the branch pipes, for supplying pulverized fuel into a gasification furnace for gasifying the pulverized fuel; a resistance body provided in each of the plurality of branch pipes, the resistance body applying a pressure loss to the powder fuel flow in the branch pipe; a pressure loss measuring means for measuring a differential pressure generated by the resistor; and a control unit that determines a decrease in the flow velocity of the pulverized fuel based on the differential pressure.
A plurality of branch pipes are connected to the distributor, and the fuel is supplied from a burner connected to the downstream end of each branch pipe into a gasification furnace for gasifying the pulverized fuel. Each of the plurality of branch pipes is provided with a resistance body that applies a pressure loss to the powder fuel flow so that the flow rates of the branch pipes are equal. The resistance body is provided with a pressure loss measuring means for measuring a pressure loss generated by the resistance body as a differential pressure. The control unit determines a decrease in the pulverized fuel flow rate based on the differential pressure obtained by the pressure loss measurement means. Thus, the drop in the flow velocity of the pulverized fuel can be reliably detected, and the conveyance failure caused by the sedimentation of the powder in the branch pipe can be grasped in advance.
Since the determination is based on the pressure loss, the decrease in the pulverized fuel flow rate can be determined with less time delay.
Since the pressure loss measuring means measures the pressure loss of the resistor, i.e., the differential pressure, and the position of the measured pressure is limited to a predetermined range, the decrease in the flow path area due to the sedimentation of the powder caused by the resistor can be avoided within the range of the measured pressure loss. Thus, the conveyance failure can be accurately determined.
Further, a pulverized fuel supply device according to an aspect of the present disclosure includes: an inert gas additional supply unit for additionally supplying inert gas to the powder fuel flow flowing to the distributor together with the fine powder fuel; and a control unit that increases a flow rate of the inert gas additionally supplied from the inert gas additional supply means when it is determined based on the differential pressure that the flow rate of the pulverized fuel flowing through the branch pipe has decreased.
When it is determined that the pulverized fuel flow rate has decreased based on the differential pressure using the pressure loss measuring means, the flow rate of the inert gas additionally supplied from the inert gas additional supply means is increased. Accordingly, the pulverized fuel can be continuously supplied from the burner into the furnace to recover the decrease in the flow velocity of the pulverized fuel, and the curtain effect of the pulverized fuel flow of the pulverized fuel can be maintained, so that the depletion of the tip inside the gasification furnace of the burner can be suppressed by blocking the radiation from the inside of the gasification furnace to the tip of the burner.
A pulverized fuel supply device according to an aspect of the present disclosure includes: a distributor for branching the supplied pulverized fuel to a plurality of branch pipes; a plurality of burners connected to downstream ends of the branch pipes, for supplying pulverized fuel into a gasification furnace for gasifying the pulverized fuel; a temperature measuring unit that measures a temperature of a downstream end portion of the downstream end of the branch pipe; and a control unit that determines a decrease in the flow velocity of the pulverized fuel based on the downstream end temperature.
A plurality of branch pipes are connected to the distributor, and the fuel is supplied from a burner connected to the downstream end of each branch pipe into a gasification furnace for gasifying the pulverized fuel. A temperature measuring means for measuring the temperature at the downstream end of the branch pipe as the temperature of the downstream end is provided, and the drop in the pulverized fuel flow rate is determined based on the temperature of the downstream end obtained by the temperature measuring means. For example, when the ratio of the pulverized fuel in the pulverized fuel stream changes, the heat transfer with the branch pipe changes and the temperature of the branch pipe changes, whereby a decrease in the flow velocity of the pulverized fuel can be determined. Thus, the drop in the flow velocity of the pulverized fuel can be reliably detected, and the conveyance failure caused by the sedimentation of the powder in the branch pipe can be grasped in advance. As the change in the temperature of the downstream end portion, the amount of change in the temperature with respect to time may be used, or the differential value of the temperature with respect to time may be used. If the differential value is used, it can be determined earlier than in the case of using the amount of change in temperature.
Since the temperature measuring means is provided at the downstream end of the branch pipe, that is, in the vicinity of the burner, the sedimentation of the powder can be determined over the entire region of the branch pipe on the upstream side of the installation position of the temperature measuring means. This makes it possible to accurately determine the decrease in the pulverized fuel flow rate.
The temperature measuring means is preferably provided in the vicinity of the downstream end of the branch pipe, and for example, when the diameter of the branch pipe is D, it is more preferably provided within 50D from the connection position with the burner. More specifically, the distance is within 5m from the connection position with the burner.
Further, a pulverized fuel supply device according to an aspect of the present disclosure includes: an inert gas additional supply unit for additionally supplying inert gas to the powder fuel flow flowing to the distributor together with the fine powder fuel; and a control unit that increases a flow rate of the inert gas additionally supplied from the inert gas additional supply unit when it is determined based on the downstream end temperature that the flow rate of the pulverized fuel flowing through the branch pipe is decreased.
When it is determined that the pulverized fuel flow rate is decreased based on the temperature of the downstream end portion measured by the temperature measuring means, the flow rate of the inert gas additionally supplied from the inert gas additional supply means is increased. Accordingly, the pulverized fuel can be continuously supplied from the burner into the furnace to recover the decrease in the flow velocity of the pulverized fuel, and the curtain effect of the pulverized fuel flow of the pulverized fuel can be maintained, so that the depletion of the tip inside the gasification furnace of the burner can be suppressed by blocking the radiation from the inside of the gasification furnace to the tip of the burner.
In the pulverized fuel supply device according to an aspect of the present disclosure, the branch pipe is provided with a pulverized fuel density measuring means for measuring a density of the pulverized fuel.
By providing the branched pipe with a pulverized fuel density measuring means for measuring the density of the pulverized fuel, the mass flow rate of the pulverized fuel flow can be obtained. This makes it possible to more accurately determine the decrease in the pulverized fuel flow rate.
As the pulverized fuel density measuring means, for example, a γ -ray densitometer can be used.
Further, a gasification furnace facility according to an aspect of the present disclosure includes: the pulverized fuel supply apparatus according to any one of the above; and a gasification furnace to which the pulverized fuel is supplied from the pulverized fuel supply device.
Further, a gasification combined cycle plant according to an aspect of the present disclosure includes: the above-described gasification furnace apparatus; a gas turbine that is rotationally driven by burning at least a part of the generated gas generated in the gasification furnace facility; a steam turbine that is rotationally driven by steam generated in an exhaust heat recovery boiler into which turbine exhaust gas discharged from the gas turbine is introduced; and a generator rotationally coupled to the gas turbine and/or the steam turbine.
In addition, in a method for controlling a pulverized fuel supply apparatus according to an aspect of the present disclosure, the pulverized fuel supply apparatus includes: a distributor for branching the supplied pulverized fuel to a plurality of branch pipes; a plurality of burners connected to downstream ends of the branch pipes, for supplying pulverized fuel into a gasification furnace for gasifying the pulverized fuel; a resistance body provided in each of the plurality of branch pipes, the resistance body applying a pressure loss to the powder fuel flow in the branch pipe; and a pressure loss measuring means for measuring a differential pressure generated by the resistor, wherein the control method determines a decrease in the flow velocity of the pulverized fuel based on the differential pressure.
In addition, in a method for controlling a pulverized fuel supply apparatus according to an aspect of the present disclosure, the pulverized fuel supply apparatus includes: a distributor for branching the supplied pulverized fuel to a plurality of branch pipes; a plurality of burners connected to downstream ends of the branch pipes, for supplying pulverized fuel into a gasification furnace for gasifying the pulverized fuel; and a temperature measuring unit that measures a temperature of a downstream end portion of the downstream end of the branch pipe, wherein the control method determines a decrease in the flow velocity of the pulverized fuel based on the temperature of the downstream end portion.
Effects of the invention
The drop in the flow velocity, which is a factor causing the transportation failure of the pulverized fuel in the transportation pipe, can be reliably detected by the pressure loss measurement means or the temperature measurement means provided in the branch pipe.
When a transport failure of the pulverized fuel occurs, the flow rate of the inert gas additionally supplied to the pulverized fuel flow is increased, so that the decrease in the pulverized fuel flow rate can be recovered while suppressing the wear of the furnace inner front end of the burner.
Drawings
Fig. 1 is a schematic configuration diagram showing an integrated coal gasification combined cycle plant according to a first embodiment of the present invention.
Fig. 2 is a schematic configuration diagram showing the gasification furnace facility of fig. 1.
Fig. 3 is a schematic configuration diagram showing a char supply system.
Fig. 4 is a schematic configuration diagram showing the char supply system on the upstream side of fig. 3.
Fig. 5 is a schematic configuration diagram showing a connection portion connecting the branch pipe and the char burner.
FIG. 6 is a graph showing the metal temperature of the branch pipe.
Fig. 7 is a graph showing a change in the flow rate of the diluent nitrogen.
Fig. 8 is a graph showing a differential value of the metal temperature of fig. 6.
Fig. 9 is a schematic configuration diagram of a gamma-ray densitometer disposed in the branch pipe of fig. 3.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[ first embodiment ]
Fig. 1 shows a schematic configuration of an integrated coal gasification combined
An Integrated Gasification Combined Cycle (IGCC) 10 employs an air combustion system that uses air as a main oxidant and generates a combustible gas (generated gas) from a fuel in a
In the present embodiment, the positional relationship between the components described using the expressions above and below indicates a vertically upper side and a vertically lower side, respectively.
As shown in fig. 1, an integrated coal gasification combined cycle plant (integrated gasification combined cycle plant) 10 includes: a
The
The
A compressed
The
The
The
The gas turbine 17 includes: the
The
A
Next, the operation of the integrated coal gasification combined
In the integrated coal gasification combined
The pulverized coal and char supplied to the
In the
The produced gas from which the char is separated by the
The exhaust-heat-
Instead of forming the same shaft to rotate the
Then, the
Next, the
As shown in fig. 2, the
The gasification furnace 101 is formed to extend in the vertical direction, pulverized coal and oxygen gas are supplied to the lower side in the vertical direction, and a generated gas that is partially combusted and gasified flows from the lower side to the upper side in the vertical direction. The gasification furnace 101 includes a
The
The
The annular portion 115 is a space formed inside the
The burner unit 116 is a space for partially burning the pulverized coal, the char, and the air, and a combustion device including a plurality of burners 126 is disposed on the
The decompressor 118 becomes a space: the gasification furnace is provided with a space for supplying pulverized coal to the combustion gas from the burner part 116 and partially combusting the pulverized coal while maintaining a high temperature state necessary for the gasification reaction, and generating a generated gas by decomposing and gasifying the pulverized coal into volatile components (carbon monoxide, hydrogen, lower hydrocarbons, etc.), and a combustion device comprising a plurality of burners 127 is disposed on the
Syngas cooler 102 is provided inside
The
In the gasification furnace 101 of the
[ char supply System ]
Next, a coke supply system (pulverized fuel supply apparatus) that supplies coke from the supply hopper 52 (see fig. 1) in which coke is stored to the
Fig. 3 shows a burner distributor (distributor) 84 for distributing the char introduced from the burner junction 80 (see fig. 4) to a plurality of
Each
A differential pressure gauge (pressure loss measuring means) 86 is provided before and after the flow nozzle 85. Instead of the differential pressure gauge 86, a pressure gauge may be provided before and after the flow nozzle 85 to measure the differential pressure of the flow nozzle 85. The differential pressure gauge 86 measures the pressure loss, i.e., the differential pressure, of the flow nozzle 85. The differential pressure gauge 86 is provided before and after the flow nozzle 85 so as to avoid the inclusion of pressure loss other than the flow nozzle 85. The output of the differential pressure from the differential pressure gauge 86 is transmitted to a control unit, not shown.
Further, since the system having the
A purge nitrogen gas supply pipe 87 is connected to the upstream side (the burner distributor 84 side) of the differential pressure gauge 86 provided in each
A temperature sensor (temperature measuring means) 88 such as a thermocouple is provided near the
A delivery pipe shut-off valve 89a and a burner inlet shut-off
The system on the upstream side of the burner distributor 84 is shown in fig. 4. A burner combiner 80 is connected to the upstream side of the burner distributor 84 via a char-combining pipe 90. A plurality of supply hoppers 52 (see fig. 1) are connected in parallel to the upstream side of the burner junction 80. A flow of the mixed flow of nitrogen and char, i.e., a char flow, is guided from
The char collection pipe 90 is a pipe connected between the burner combiner 80 and the burner distributor 84. The char collection pipe 90 is provided with a mixing chamber 91 and a char supply flow rate adjustment valve 92 in this order from the upstream side of the char flow.
A diluent nitrogen gas supply pipe (inert gas additional supply means) 93 is connected to the mixing chamber 91. In the mixing chamber 91, nitrogen is additionally supplied from the diluted nitrogen gas supply pipe 93 to the char flow guided from the burner junction 80. A diluted nitrogen gas flow rate adjustment valve 94 for adjusting the flow rate of the diluted nitrogen gas is provided in the diluted nitrogen gas supply pipe 93. The opening degree of the diluted nitrogen flow rate adjustment valve 94 is adjusted by a control unit, not shown.
The coke supply flow rate adjustment valve 92 is adjusted in opening degree by a control unit, not shown. The flow rate of the char flow supplied to the burner distributor 84 is determined by the char supply flow rate adjustment valve 92.
The control Unit (not shown) includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program as an example, and the various functions are realized by a CPU reading the program into a RAM or the like and executing processing and arithmetic processing of information. The program may be installed in advance in a ROM or other storage medium, provided in a state of being stored in a computer-readable storage medium, or transmitted via a wired or wireless communication means. The storage medium that can be read by the computer is a magnetic disk, an optical magnetic disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.
Next, a method of operating the char supply system will be described.
As shown in fig. 4, the mixed fluid of char and nitrogen is guided from the
As shown in fig. 3, the char introduced into the burner distributor 84 is branched into a plurality of
The differential pressure gauge 86 constantly measures the differential pressure of the flow nozzle 85. The control unit monitors the output of the differential pressure gauge 86, and determines that the char flow rate (the flow rate of the mixed fluid of nitrogen and char) has decreased when the variation of the differential pressure with respect to time exceeds a threshold value. For example, when the coal char flow velocity decreases, the pressure loss decreases and the differential pressure decreases, and therefore, when the coal char flow velocity becomes lower than the threshold value, it is determined that the coal char flow velocity decreases. The threshold value of the differential pressure variation is set in advance by experiment or simulation.
When the control unit determines that the coal char flow rate has decreased, the opening degree of the diluted nitrogen flow rate adjustment valve 94 (see fig. 4) is increased to increase the flow rate of the diluted nitrogen introduced into the mixing chamber 91. This increases the flow rate of the char stream to be introduced into the burner distributor 84, thereby eliminating a decrease in the flow rate of the char stream in the
When the flow rate of the char flow flowing in the
The determination of the decrease in the flow velocity of the char stream is performed for each
In the present embodiment, the flow rate of the dilution nitrogen gas introduced from the dilution nitrogen gas supply pipe 93 to the mixing chamber 91 is increased to increase the flow rate of the char flow introduced to the burner distributor 84, thereby eliminating a decrease in the flow rate of the char flow in the
According to the present embodiment, the following operational effects are exhibited.
The decrease in the flow velocity of the char stream is determined based on the differential pressure generated by the pressure loss of the flow nozzle 85 obtained by the differential pressure gauge 86. This makes it possible to reliably detect a decrease in the flow velocity of the char flow and to grasp in advance a conveyance failure caused by the sedimentation of the pulverized fuel (char) in the
Since the determination is performed based on the differential pressure caused by the pressure loss, the decrease in the flow velocity of the coal char stream can be determined with a small time delay.
For example, when one pressure sensor is provided in the char collection pipe 90 and another pressure sensor is provided in each
When it is determined that the flow rate of the coal char stream has decreased, the flow rate of the diluent nitrogen introduced from the diluent nitrogen supply pipe 93 into the mixing chamber 91 is increased to recover the decrease in the flow rate of the coal char stream. Thus, before it is determined that the retention of the char occurs in the
[ second embodiment ]
Next, a second embodiment of the present invention will be explained. The basic configuration of the present embodiment is different from that of the first embodiment in that the temperature sensor 88 determines a decrease in the flow rate of the char stream. Therefore, the following description will mainly explain the differences from the first embodiment.
As shown in fig. 3, the temperature sensor 88 is provided at the
As shown in fig. 5, the tip of the
The control unit determines a decrease in the flow velocity of the char stream flowing through the
The temperature sensor 88 is provided in the vicinity of the
In fig. 6, the output (in terms of metal temperature) of the temperature sensor 88 provided at the
When the flow rate of the diluted nitrogen gas is increased from the diluted nitrogen gas supply pipe 93 (see fig. 4), an offset value may be set for the diluted nitrogen gas as shown in fig. 7. That is, a fixed diluent nitrogen base value is set, and the diluent nitrogen offset value is changed based on a decrease in the metal temperature (the temperature of the branch pipe 82) obtained by the temperature sensor 88. As described with reference to fig. 7, the metal temperature starts to decrease after 30 minutes has elapsed, and when the metal temperature becomes lower than the metal temperature threshold value, the diluent nitrogen bias value is increased from around 40 minutes. After the metal temperature recovers and exceeds the metal temperature threshold, the diluent nitrogen bias value is gradually decreased.
The metal temperature is recovered by increasing the diluent nitrogen offset value by changing the diluent nitrogen offset value based on the decrease in the metal temperature (the temperature of the branch pipe 82) obtained by the temperature sensor 88. That is, the decrease in the flow velocity of the char stream can be recovered to suppress the precipitation of the char in the
According to the present embodiment, the following operational effects are exhibited.
The drop in the flow rate of the coal char stream is determined based on the downstream end temperature obtained by the temperature sensor 88. Therefore, the decrease in the coal char flow rate can be determined without using the differential pressure gauge 86 as in the first embodiment. However, the drop in the flow rate of the coal char stream may be determined by the differential pressure gauge 86 in combination.
Further, since the temperature sensor 88 is provided at the
This makes it possible to reliably detect a decrease in the flow velocity of the char flow and to grasp in advance the conveyance failure caused by the sedimentation of the powder in the
Further, by changing the flow rate of the diluted nitrogen gas based on the decrease in the downstream end temperature obtained by the temperature sensor 88, the decrease in the flow rate of the char stream can be recovered, and the precipitation of the char in the
Therefore, before it is determined that the retention of the char occurs in the
Further, the decrease in the flow rate of the coal char stream is determined by observing the change in the temperature measured by the temperature sensor 88 with respect to the elapsed time, but the determination may be made based on the differential value of the temperature measured by the temperature sensor 88 with respect to the time.
In fig. 8, the differential value of the metal temperature of fig. 6 is shown by a one-dot chain line. As can be seen from this graph, the differential value of the metal temperature is calculated from time 0: 00 has already fallen. When the drop of the differential value continues for a predetermined time (for example, 15 minutes), it is determined that the flow rate of the coal char stream is decreased. Thus, a decrease in the flow rate of the coal char stream can be determined earlier than when it is determined based on the amount of change in the metal temperature (after 30 minutes have elapsed).
As shown in fig. 9, in addition to the first and second embodiments, a γ -ray densitometer (pulverized fuel density measuring means) 96 for measuring the density of char may be provided for each
In the above embodiments, the coke supply system has been described, but the present invention may be applied to a system for supplying pulverized coal, or may be applied to a system for supplying another pulverized fuel.
Description of the reference numerals
10 coal gasification combined cycle plant (gasification combined cycle plant)
11 coal supply equipment
11a coal supply line
14 gasification furnace equipment
15 coke recovery equipment
16 gas purification equipment
17 gas turbine
18 steam turbine
19 electric generator
20 exhaust heat recovery boiler
41 compressed air supply line
42 air separation plant
43 first nitrogen supply line
45 second nitrogen supply line
46 char return line
47 oxygen supply line
49 gas generating line
51 dust collecting apparatus
52 feed hopper
53 gas discharge line
61 compressor
62 burner
63 turbine
64 rotating shaft
65 compressed air supply line
66 fuel gas supply line
67 combustion gas supply line
68 step-up machine
69 turbine engine
70 air exhaust line
71 steam supply line
72 steam recovery line
74 gas cleaning equipment
75 chimney
80 burner confluent device
82 branch pipe
84 burner distributor (distributor)
85 flow nozzle (resistance body)
86 differential pressure gauge (pressure loss measuring unit)
87 purge nitrogen gas supply piping
88 temperature sensor (temperature measuring unit)
89a conveying pipe cut-off valve
89b combustor inlet cut-off valve
90-coke converging piping
91 mixing chamber
92-coke supply flow rate regulating valve
93 Dilute nitrogen gas supply piping (inert gas additional supply means)
94 dilution nitrogen flow regulating valve
95 cooling coil
96 gamma ray densitometer (powder fuel density measuring unit)
101 gasification furnace
102 syngas cooler
110 pressure vessel
111 gasification furnace wall
115 annular portion
116 burner section
117 diffuser section
118 pressure reducer part
121 gas outlet
122 slag hopper
126 burner
126a coke burner
127 burner
131 evaporator
132 superheater
134 coal economizer
154 inner space
156 outer space.
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