JP3098240B2 - Solid fuel combustion control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) The present invention mainly converts a combustible gas generated from solid combustible materials such as flammable industrial waste, flammable garbage and coal into natural dry-distilled gas at a high temperature. It is related to stable combustion control when recovering energy by burning it, and in the natural distillation gasification combustion device, it is possible to fully automate the entire combustion control including fuel supply, so that currently known liquids and gases can be A control function comparable to that of a fully automatic combustion control system that uses fuel assures safe and stable automatic operation of a solid fuel combustion device, and automatic startup and automatic continuous operation that were previously impossible with a solid fuel combustion device. The main purpose is to make the control possible and to obtain a great economic effect by saving labor.

(Industrial application field) In the industrial field, a natural boiler gasification and combustion apparatus as a heat energy supply apparatus for a steam boiler apparatus, a hot water boiler apparatus, a hot air generator, a baking apparatus, and a drying apparatus, and a control method according to the present invention, and Use a control device. Further, the present invention can be widely used for a control method and a control device of a natural dry gasification combustion apparatus as an industrial waste incinerator and an urban waste incinerator.

(Prior Art) Conventionally, a direct combustion method has been generally used as a combustion method for combustible solid fuel, and a part of the apparatus is partially automatically controlled or labor-saving. Nothing has been fully automated. As a well-known technique, it is often found in the case of a coal combustion device.

(B) Automatic coal feeder (b) Automatic coal disperser (c) Chain stalker burner (d) Pulverized coal burner These are some of the combustion devices that have been automated to save labor. Unlike a heavy oil combustion boiler device and a gas fired boiler device, it is not possible to automatically control the combustion device comprehensively by operating only one start switch of the combustion device. In addition, as an example of an automatic dry distillation combustion device,
In this case, the fuel shown in Japanese Patent Application No. 57-28910 is cited.In this case, after the fuel is once stored in a storage tank, the fuel is injected into the top of the primary combustion chamber by a conveyor, and the fuel is transferred by a transfer device provided in the primary combustion chamber. Move the fuel, dry air by introducing air that is insufficient for complete combustion in the chamber, introduce the generated dry gas into the secondary combustion chamber connected to the primary combustion chamber, add secondary air and complete combustion A method of recovering heat by a subsequent waste heat boiler or heat exchanger is employed.

(Problems to be Solved by the Present Invention) Although a transfer device for transferring the burning fuel is provided in the primary combustion chamber used in the above cited prior art, the structure is in direct contact with the combustion atmosphere. Susceptible to temperature and evolved gas. Because of this,
There is a drawback that deformation and oxidation wear are remarkable.

In addition, when industrial waste or garbage waste is used as fuel, there is a disadvantage that the transfer device is damaged by foreign substances (incombustibles such as metals and concrete) mixed therein, and the device is destroyed. This measure is one object of the present invention.

The primary combustion chamber used in the prior art, or the dry distillation gasifier used in the natural dry distillation gasification combustion device, unlike the fast combustion in general direct combustion, needs to limit the amount of combustion air. Although it is described that the oil burner is provided as an oil burner, excess air is likely to enter at the start of combustion in this primary combustion chamber or the dry distillation gasifier, and there is a danger of gas explosion and deflagration. However, since there is a risk of flashback, this preventive measure is the second object of the present invention.

Gas generation in the primary combustion chamber used in the prior art or in the dry distillation gasification furnace, even when automatic control is performed, the physical properties of the injected fuel are coal, wood, fiber, paper, plastics, rubber, It usually changes by changing with these mixtures and the like, and the gasification state also changes. This signal is calmed down, and the signals generated by the detectors of the dry gasifier, the secondary combustion furnace, and the waste heat recovery unit, and the signals indicated by the gas concentration detector in the flue gas conduit interact from the start to the end of the operation. It is a third object of the present invention to operate each furnace safely.

BACKGROUND ART In a dry gasifier having a primary combustion chamber and a structure for depositing fuel used in the prior art, a phenomenon that dust and dust accompanying a burning gas flow increase is inevitable. This not only causes the pollution of the subsequent apparatus by dust to be promoted, but also increases the amount of dust in the discharged combustion exhaust gas. This measure is the fourth object of the present invention.

It is another object of the present invention to simplify the apparatus by sharing the introduction of air for the ignition burner for starting ignition of fuel in the dry distillation gasifier with the air duct at the outlet of the primary air fan.

Conventionally, it has been difficult to fully control a solid fuel combustion device. However, it has been found that simplification of operation, safety, and labor saving can be achieved by fully automatic control of a natural dry gasification combustion device. For other purposes.

(Means for Solving the Problems) In order to solve the above-mentioned object, in the present invention, in order to cope with the shape of the input fuel and changes in physical properties, no structure such as a transfer device is provided in the primary combustion chamber. Adopt a storage and storage type dry distillation gasifier.

The automatic control device is equipped with a contact connected to the pseudo input setting device and a contact connected to the combustion furnace outlet temperature detector in the blower pipe at the outlet of the primary air fan that supplies primary air to the carbonization furnace, and is operated by the signal of the automatic control device. A first control valve is provided.In the initial stage of operation, the first control valve keeps the opening restricted by the value set in advance in the pseudo input setting device of the automatic control device, and air outside the gas explosion limit in the distillation furnace to the distillation furnace. To prevent gas explosion at the beginning of operation,
When the temperature of the combustion furnace outlet rises and exceeds the temperature preset in the automatic control device, the contact connected to the pseudo input setting device of the automatic control device is switched from the contact connected to the combustion furnace outlet temperature detector, and the temperature of the combustion furnace outlet temperature is changed. The first control valve is automatically opened and closed in proportion to the output state of the detector, and the primary air amount corresponding to the temperature of the combustion furnace outlet by the combustion of the dry gas in the combustion furnace is supplied to the distillation furnace.

In series with the first control valve provided in the air pipe at the outlet of the primary air fan of the dry distillation furnace, a load fluctuation detector of the waste heat recovery device, for example, a second control valve operated by a detected temperature signal, a pressure signal, or the like. Automatically opens and closes the second control valve in proportion to the output signal of the load fluctuation detector, increasing the opening when the heat input requirement of the waste heat recovery device is large, and decreasing the opening when the heat input requirement is small. During normal operation, the second control valve controls the primary air, controls the output of the still, and keeps the load of the waste heat recovery device constant.

On the other hand, in the combustion furnace, the residual oxygen concentration in the exhaust gas is measured by a residual oxygen concentration detector, which is one of the gas concentration detectors installed in the flue gas conduit, and the secondary air control valve is opened and closed in proportion to this signal. The amount of secondary air supplied to the combustion furnace is adjusted and controlled.If the residual oxygen concentration decreases, the combustion temperature in the combustion furnace rises, but in the worst case, incomplete combustion due to insufficient combustion air produces soot. Therefore, the amount of secondary air is increased to prevent soot generation and lower the combustion temperature, and if the residual oxygen concentration increases, the secondary air becomes excessive and the combustion temperature drops, so the secondary air is restricted and the combustion temperature is reduced. And always maintain a stable combustion state.

In addition, in order to make the input energy of the waste heat recovery device unstable when the temperature of the combustion furnace outlet is extremely high or low, a primary control valve is installed in the primary air blower pipe, and the combustion furnace outlet temperature detector is switched by the automatic control device. Applying the detected value of the temperature of the combustion furnace outlet to the contact connected to, controls the opening and closing of the first control valve in proportion to the output status of the temperature detector of the combustion furnace outlet, and controls the amount of primary air sent to the dry distillation furnace Then, the amount of gas generated by the distillation in the distillation furnace is controlled to maintain a stable combustion furnace outlet temperature.

In the normal operation other than the initial operation, the distillation furnace controls the primary air amount of the first control valve and the second control valve as described above, and the combustion furnace controls the secondary air amount by the secondary air control valve. By means of the adjustment by the above, the stable and continuous combustion in the dry distillation furnace and the combustion furnace is continued and maintained.

If the addition of fuel is stopped despite the continuous operation of the gasification combustion device, the fuel in the dry distillation furnace is consumed and gradually decreases. The combustion temperature in the furnace also drops. In this case, the first control valve provided in the outlet line of the primary air fan operates in the opening direction to increase the amount of primary air in response to a signal from the combustion furnace outlet temperature detector. The second control valve provided in series with the first control valve also operates in the opening direction in an attempt to hold the load in response to a signal from the load fluctuation detector of the waste heat recovery device. If left in such a situation, the primary air will be excessively supplied to the dry distillation furnace, and the flow rate of air passing through the fuel remaining in the dry distillation furnace will increase. As a result, a large amount of dust such as ash in the fuel will be exhausted. It will be. In order to prevent such a phenomenon, when the detected value of the combustion furnace outlet temperature becomes equal to or lower than the temperature preset in the automatic control device, the contact connected to the combustion furnace outlet temperature detector of the automatic control device is switched to the contact connected to the pseudo input setting device. Then, the opening of the first control valve is returned to the initial operation opening limited by the value preset in the pseudo input setting device, and the amount of primary air supplied to the distillation furnace is suppressed.

At this time, the temperature of the outlet of the combustion furnace decreases, and the secondary air becomes excessive. Therefore, the secondary air provided in the secondary air blower pipe is proportional to the signal generated by the gas concentration detector provided in the smoke exhaust conduit. The secondary air control valve operates in the closing direction to adjust the secondary air amount and reduce the amount appropriately, thereby preventing a rapid decrease in the combustion furnace outlet temperature.

As described above, a change in the primary and secondary air amounts of the combustion temperature in one combustion system causes a change in the amount of combustion gas, which induces a static pressure fluctuation in the combustion system and causes an unstable combustion phenomenon. For this reason, the static pressure fluctuation value of the combustion furnace is detected, and an automatic static pressure adjusting valve for automatically adjusting the static pressure of the combustion furnace is provided in the exhaust pipe,
Control to maintain the static pressure in the combustion system at the set value,
Keep stable fuel.

More specifically, the solid fuel combustion control method of the present invention includes a solid fuel supply device including an automatic level meter including a storage tank, a fuel cutout device, a transfer device, and a level control device; a grate rotating device; It has an ash storage tank, an ignition burner, an automatic air setting valve for the ignition burner, an ignition temperature detector, and a primary air supply device comprising a primary air fan, a blower tube, a first control valve for the primary air, and a second control valve. A distillation furnace, a pilot burner connected to the distillation furnace and controlled by a pilot burner control device having a flame detector, a combustion furnace outlet static pressure detector, a combustion furnace outlet temperature detector, a secondary air fan, and secondary air. A combustion furnace having a secondary air supply device including a blower tube and a secondary air control valve; a waste heat recovery device located downstream of the combustion furnace and having a load fluctuation detector; and a waste heat recovery device A method for controlling solid fuel combustion in a gasification combustion apparatus comprising: an automatic static pressure control valve provided in a downstream flue and a smoke exhaust fan located downstream of the automatic static pressure control valve; and a smoke exhaust conduit having a gas concentration detector. A first control valve provided in a blower pipe connected to an outlet of a primary air fan for supplying primary air to the dry distillation furnace, an automatic valve having a contact connected to a pseudo input setting device and a contact connected to a combustion furnace outlet temperature detector; In addition to being operated by a signal from the control device, in the initial stage of operation, the first control valve is controlled to close to an initial operation opening limited by a value preset in a pseudo input setting device of the automatic control device, and the distillation furnace The air outside the gas explosion limit is sent to the distilling furnace, and the temperature at the outlet of the combustion furnace rises, and when the temperature detected by the combustion furnace outlet temperature detector exceeds the temperature set in the automatic control device, the automatic control device Pseudo input setting device Switch from the contact connected to the combustion furnace outlet temperature detector to the contact connected to the combustion furnace outlet temperature detector, automatically control the first control valve in proportion to the output condition of the combustion furnace outlet temperature detector, and send primary air to the dry distillation furnace. After the solid fuel is incompletely combusted and gasified, the incompletely combusted gas is introduced into a combustion furnace connected to the dry distillation furnace and completely combusted. With the signal emitted, the secondary air control valve provided on the secondary air blower pipe connected to the secondary air fan outlet is controlled to open and close proportionally, supplying the optimal secondary air amount for combustion in the combustion furnace,
Furthermore, an automatic static pressure control valve provided in the flue downstream of the waste heat recovery device is proportionally opened and closed by a signal generated by a static pressure detector at the combustion furnace outlet provided at the combustion furnace outlet, and the optimum furnace for combustion in the combustion furnace. The internal static pressure is adjusted and secured, and the static internal pressures of the dry distillation furnace, the combustion furnace, the waste heat recovery device, and the combustion furnace are controlled in relation to each other.

In this case, in series with the first control valve provided in the blower pipe connected to the outlet of the primary air fan that supplies the primary air to the dry distillation furnace, the second control valve operates in response to the signal of the load fluctuation detector provided in the waste heat recovery device. A control valve is provided, and when the heat input demand of the waste heat recovery device is large, the opening is increased, and when the heat input demand is small, the opening is reduced so that the operation is performed by the output signal of the load fluctuation detector. Can be proportionally opened and closed.

Further, in order to obtain air to the ignition burner, a blower tube for supplying primary air to the dry distillation furnace is commonly used, and the combustion of the ignition burner is provided downstream of the first control valve and the second control valve provided in the blower tube. An automatic air setting valve for an ignition burner that opens and closes by a start / combustion stop signal is provided.In the initial stage of operation, an ignition air burner combustion start signal at a temperature equal to or lower than a temperature preset in an ignition temperature detector is used to activate the automatic air setting valve for the ignition burner. It closes to a preset angle, controls the air flow to secure and maintain stable combustion of the ignition burner, and sends an ignition burner combustion stop signal at a temperature equal to or higher than a preset temperature to an ignition temperature detector. The air setting valve is fully opened, the combustion start signal circuit of the ignition burner is cut off by the fully open signal of the automatic air setting valve for the ignition burner, and gasification continues even after the ignition combustion of the ignition burner is stopped. During operation of the baked apparatus may be adapted to maintain the automatic air setting valve for ignition burner fully opened.

When the amount of light detected by the flame detector is equal to or more than the amount of light preset in the pilot burner control device, the combustion function of the pilot burner is stopped, and the amount of light detected by the flame detector is equal to or less than the amount of light preset in the pilot burner control device. Then, the combustion of the pilot burner can be started without delay.

Next, an embodiment of the solid fuel combustion control method of the present invention will be described with reference to the drawings.

In operating a series of gasification and combustion devices, first, after setting the setting switch provided in the automatic control device 32 to `` fuel supply '', when the automatic operation switch provided in the automatic control device 32 as well as the setting switch is `` ON '', The level of the solid fuel in the dry distillation furnace 4 is measured by the automatic level meter 5 and the level control device 6
Is started by the fuel supply start signal generated by the fuel cell, the fuel cut-out device 2 is started by the rated operation signal of the transfer device 3, and the solid fuel stored in the storage tank 1 is started to be supplied to the distillation furnace 4, and the dry distillation is performed. The solid fuel deposition height in the furnace 4 is detected by a mechanical or automatic level meter 5 using ultrashort waves, sound waves, etc., and the fuel deposition height in the dry distillation furnace 4 is adjusted to a deposition height preset in the level control device 6. When it reaches, the operation of the fuel cut-out device 2 is stopped by the full signal generated by the level control device 6,
Subsequently, the transportation device 3
Is stopped and the fuel supply to the distillation furnace 4 is stopped. However, the start and the stop of the supply of the fuel are performed unless the setting switch of the automatic control device 32 is changed to “fuel stop”. The fuel accumulation height is always measured by the automatic level meter 5,
The starting and stopping of the transporting device 3 and the fuel cut-out device 2 are controlled by a start / stop signal generated by the level control device 6, and the dry distillation furnace 4 is controlled.
The fuel deposition height in the inside is always kept constant.

The exhaust gas fan 7 is started by the fuel full signal generated by the level control device 6 at the first time of the operation start, and the static pressure in the combustion device is proportional to the signal of the static pressure detector 31 at the combustion furnace, and the waste heat recovery device.
25 The automatic pressure suppression control valve 8 provided in the smoke exhaust pipe on the downstream side is opened and closed to maintain the static pressure at the combustion furnace outlet static pressure detector 31 at a predetermined static pressure. This static pressure adjustment control is performed when the gasification and sintering apparatus is operated. Continue as long as possible.

Next, the secondary air fan 9 is started with the rated operation signal of the smoke exhaust fan 7. This amount of secondary air is supplied to the smoke
A secondary air control valve 13 is opened and closed proportionally via a line 12 by a signal generated by a gas concentration detector 11 provided in a combustion furnace 15.
It is adjusted and controlled so that the amount of secondary air is optimal for combustion in
This secondary air amount adjustment control is continued as long as the gasification combustion device is operating, but the gas concentration detector 11 includes a residual oxygen concentration detector, a carbon monoxide concentration detector, or a carbon dioxide concentration detection. Vessel can be used.

Subsequently, the primary air fan 14 is started by the rated operation signal of the secondary air fan 9 and the contact 33 connected to the pseudo input setting device and the temperature of the combustion furnace outlet are detected in the blower pipe 18 connected to the outlet of the primary air fan 14. Automatically controls the contact 34 connected to the heater 23
32, a first control valve 22 which is operated by a signal of the automatic control device 32 is provided.
The pilot opening burner 16 provided in the combustion furnace 15 is started by the rated operation signal of the primary air fan 14 and the auxiliary burner is started. When the amount of light detected by the flame detector 17 becomes equal to or greater than the amount of light preset in the pilot burner control device 36, the pilot burner 16 automatically stops the combustion function, and the amount of light detected by the flame detector 17 changes to the pilot burner. When the light quantity becomes equal to or less than the light quantity preset in the control device 36, the pilot burner is controlled so as to start combustion without delay, and this control is continued as long as the operation of the gasification combustion device is continued. Gas explosion due to delayed combustion due to misfiring etc. when burning the dry gas in the furnace, but the function of the flame detector 17 is to detect the amount of infrared rays or ultraviolet rays, and to detect the temperature. It is also possible with a dispenser.

Next, the combustion of the ignition burner 19 is started with a delay set in advance by a timer provided in the automatic control device 32 and activated by the activation signal of the pilot burner 16, and the air blower tube for the ignition burner 19 is usually dedicated. Although a separate tube is provided, in the present invention, in order to obtain air for the ignition
The air blower pipe 18 connected to the outlet of the primary air fan 14 that supplies the primary air to the air blower 18 is shared, and an ignition burner 19 is provided in a downstream side pipe of the first control valve 22 and the second control valve 28 provided in the blower pipe 18.
An automatic air setting valve 20 is provided, and the automatic air setting valve 20 is closed to a preset angle at the automatic air setting valve 20 by an ignition burner combustion start signal at a temperature equal to or lower than a temperature preset in the ignition temperature detector 21, The air volume is controlled so as to ensure and maintain stable combustion of the ignition burner 19.

The ignition of the solid fuel deposited in the dry distillation furnace 4 is started by the ignition and combustion of the ignition burner 19, and when the temperature in the dry distillation furnace 4 rises and becomes equal to or higher than the temperature preset in the ignition temperature detector 21, the ignition burner At the same time as the combustion of 19 is stopped, the automatic air setting valve 20 is fully opened by the combustion stop signal of the ignition burner 19, and the ignition burner 19 is
The combustion start signal circuit is cut off, the reburning of the ignition burner 19 is controlled to be inhibited, and the primary air blown by the primary air fan 14 is connected to a pseudo input setter provided in a blower pipe 18 connected to the outlet of the primary air fan 14. Contact 33 and combustion furnace outlet temperature detector
The automatic control device 32 is provided with a contact 34 connected to the first control valve 23, and the first control valve 22 and the waste heat recovery device 25 which are operated by the signal of the automatic control device 32
Control valve operated by the signal of the load fluctuation detector 26
28, the first control valve 22 is controlled to be maintained at an operation processing opening limited by a value preset in a pseudo input setting device provided in the automatic control device 32. The amount of primary air outside the gas explosion limit is supplied to the dry distillation furnace 4 to start the dry distillation combustion in the dry distillation furnace 4 while preventing the gas explosion phenomenon at the initial stage of the dry distillation combustion.

The dry distillation gas generated in the dry distillation furnace 4 is introduced into the combustion furnace 15 connected to the dry distillation furnace 4 for combustion. Is exceeded, the contact 33 connected to the pseudo input setter of the automatic control device 32 is switched to the contact 34 connected to the combustion furnace outlet temperature detector 23, and the first control valve 22 is changed in proportion to the signal of the combustion furnace temperature detector 23. To automatically control the amount of primary air supplied to the dry distillation furnace 4 to control the amount of dry gas generated in the dry furnace 4, while also controlling the amount of primary air to be supplied to the dry furnace 4. The output of the load fluctuation detector 26 provided in the waste heat recovery device 25 is adjusted so that the control valve 28 increases the opening when the heat input requirement of the waste heat recovery device 25 is large, and decreases the opening when the heat input requirement is small. The primary air flow is adjusted and controlled by opening and closing in proportion to the signal of the combustion furnace outlet temperature detector 23. The amount of primary air supplied to the dry distillation furnace 4 is adjusted in conjunction with the control of the amount of primary air at the first control valve 22 which opens and closes in proportion to the amount of the waste heat recovery unit 25.
Is controlled so as to maintain a stable load output, but this control is continued as long as the gasification combustion device is operated.

As described above, a series of gasification and combustion apparatuses are started and operated and operated in accordance with a preset starting order and control plan, and the clinker is operated by the ash agitation in the grate rotating device 29 in the dry distillation furnace 4. Prevent the generation, the ash is taken out to the ash storage tank 30 by rotating the grate rotator 29 in the opposite direction to the stirring direction every fixed time, but in this series of operation of the gasification combustion device, Automatic control device 32
When the setting switch is changed to "fuel stop" and the operation is continued, the fuel in the distillation furnace 4 is burned and consumed, the amount of the generated distillation gas gradually decreases, and the combustion temperature in the combustion furnace 15 also decreases. The brightness of the combustion gas also gradually decreases, but the pilot burner
16 starts combustion without delay when the light amount detected by the flame detector 17 that detects the flame in the combustion furnace 15 becomes equal to or less than the light amount set in advance in the pilot burner control device 36, and the combustion of the pilot burner 16 starts. Nevertheless, if the temperature detected by the combustion furnace outlet temperature detector 23 is equal to or lower than the temperature preset in the automatic control device 32, a pseudo input setting is performed from a contact 34 connected to the combustion furnace outlet temperature detector 23 provided in the automatic control device 32. The first control valve 22 provided in the blower pipe 18 connected to the outlet of the primary air fan 14 for supplying the primary air to the distillation furnace 4 automatically switches to the contact point 33 connected to the heater, and the pseudo input setting device provided in the automatic controller 32. However, at this time, the combustion output decreases at this time, so that the load output of the waste heat recovery device 25 following the combustion furnace 15 is secured, so that the primary air is blown. To tube 18 Second control valve 28 provided in the one regulating valve 22 series, load change detector 26 via line 27
The primary air supplied to the dry distillation furnace 4 is suppressed and controlled by the initial operation opening of the first control valve 22, and remains in the dry distillation furnace 4 due to the supply of excessive primary air. The increase in flying dust due to the blowing off of sediment such as coal fire and ash is prevented, and the operation is continued to further reduce the amount of charcoal and unburned matter in the dry distillation furnace 4, and the temperature in the dry distillation furnace 4 is detected as the ignition temperature. When the temperature becomes equal to or lower than the temperature set in advance in the heater 21, the operation of the primary air fan 14 is automatically stopped by a stop signal generated by the automatic controller 32, and at the same time, the first control valve 22 and the second The control function of the control valve 28 is also automatically stopped, and subsequently, the operation of the pilot burner 16 is automatically performed after a delay set in advance by a timer provided in the automatic control device and started by a stop signal of the primary air fan 14. At the same time as the flame The control function for starting and stopping the combustion of the pilot burner 16 in the detector 17 is also stopped, and is set in advance to a timer that is provided in the automatic control device 32 and that is started by the operation stop signal of the pilot burner 16 after the operation of the pilot burner 16 is stopped. Delay in time to secondary air fan 9
Is automatically stopped, and at the same time, the secondary air conditioning that regulates and controls the secondary air supplied to the combustion furnace 15 based on the signal of the gas concentration detector 11 provided in the smoke exhaust pipe 10 at the most downstream of the gas transformation and combustion device The control function of the valve 13 is also stopped, and following the stop of the operation of the secondary air fan 9, the timer provided in the automatic control device 32 and started by a stop signal of the secondary air fan 9 is delayed for a preset time and the smoke exhaust fan 7 is automatically stopped, and at the same time, the signal from the combustion furnace outlet static pressure detector 31 provided at the combustion furnace outlet controls the automatic static pressure regulating valve 8 provided in the flue downstream of the waste heat recovery unit 25 in proportion to the signal. The static pressure adjustment control function of opening and closing to adjust and control the static pressure in the combustion furnace 15 is stopped, and the series of operations of the gasification combustion apparatus is terminated.

(Effects) In the present invention, in combusting a solid combustible fuel, the combustible gas once gasified is burned instead of the direct combustion as in the prior art, so that there is an advantage that the combustion control becomes easy. The air supply pipe connected to the outlet of the air fan is provided with two primary air control valves, a first control valve and a second control valve, in the series, and the first control valve close to the primary air fan limits the initial amount of dry distillation combustion air. While maintaining the temperature outside the gas explosion limit, while the temperature of the combustion furnace is equal to or higher than the set temperature, the opening degree of the first control valve is increased to increase the amount of primary air, thereby promoting the generation of dry gas in the dry furnace. The second control valve is opened and closed according to the load condition of the waste heat recovery device, the primary air amount corresponding to the load of the waste heat recovery device is supplied to the dry distillation furnace, the generation of the dry gas is regulated and the combustion output is controlled. Maintains stable combustion output in the combustion furnace and reduces waste heat Maintain a stable load output in the collecting device and feed back a signal from the gas concentration detector in the flue gas duct to the secondary air control valve to control the amount of secondary air. Along with the introduction of gas, ensure good combustion with little fluctuation, always monitor the inside of the combustion furnace with a flame detector, start and stop combustion of the pilot burner with a preset light amount, and prevent misfire. Prevents the emission of unburned gas, keeps the combustion in the combustion furnace always stable, and simplifies the equipment by sharing the primary air supply pipe for the supply of ignition burner air to the dry distillation furnace. , Furthermore, the above-mentioned control is comprehensively coordinated and automated to enable the prevention of gas explosion and flashback danger associated with gasification combustion, and set in advance by turning on the automatic operation switch. According to the starting order and control plan Next each device and automatically starts to operation control equipment, "fuel stop" the setting switch
The present invention, which automatically shuts down each device and equipment in sequence according to a preset shutdown plan, and smoothly ends the operation of a series of gasification and combustion devices, is a liquid fuel and a gas fuel. As a control method comparable to an automatic control method for a combustion device using a fuel cell, a labor saving effect and an economic effect by opening a way to unmanned operation by automation of a combustion device using solid combustibles as fuel are great.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing one embodiment of the solid fuel combustion control method of the present invention. DESCRIPTION OF SYMBOLS 1 ... Storage tank 2 ... Fuel cut-out device 3 ... Conveying device 4 ... Drying furnace 5 ... Automatic level meter 6 ... Level control device 7 ... Smoke exhaust fan 8 ... Automatic static pressure control valve 9 ... 2 Primary air fan 10 Smoke exhaust conduit 11 Gas concentration detector 12 Line 13 Secondary air control valve 14 Primary air fan 15 Combustion furnace 16 Pilot burner 17 Flame detector 18 …… Blower tube 19 …… Ignition burner 20 …… Automatic air setting valve 21 …… Ignition temperature detector 22 …… First control valve 23 …… Combustion furnace outlet temperature detector 24 …… Line 25 …… Waste heat recovery Device 26 Load detector 27 Line 28 Second control valve 29 Grate rotating device 30 Ash storage tank 31 Static pressure detector 32 at combustion furnace outlet 32 Automatic controller 33 … Switching contact 34 …… Switching contact 35 …… Secondary air blower pipe 36 …… Pilot burner control device

Claims (4)

(57) [Claims] 1. A solid fuel supply device comprising an automatic level meter (5) having a storage tank (1), a fuel cut-out device (2), a transport device (3) and a level control device (6); Device (29), ash storage tank (30), ignition burner (19), automatic air setting valve for ignition burner (20), ignition temperature detector (21) and primary air fan (14), air duct (18) A dry distillation furnace (4) having a primary air supply device comprising a first control valve (22) and a second control valve (28) for primary air; and a flame detector (4) connected to the dry distillation furnace (4). 17) a pilot burner (16) controlled by a pilot burner control device (36) equipped with a combustion furnace outlet static pressure detector (31), a combustion furnace outlet temperature detector (23), and a secondary air fan (9); A fuel having a secondary air supply device composed of a secondary air blower pipe (35) and a secondary air control valve (13) A furnace (15) and a load fluctuation detector (2) located downstream of the combustion furnace (15).
A waste heat recovery device (25) having a 6), an automatic static pressure control valve (8) provided in a flue downstream of the waste heat recovery device (25), and a smoke exhaust fan (7) located downstream thereof.
A flue gas conduit (10) having a gas concentration detector (11); and a method for controlling solid fuel combustion in a gasification combustion device, comprising: a primary air fan for supplying primary air to the dry distillation furnace (4). The first control valve (22) provided in the blower pipe (18) connected to the outlet of (14) is connected to the contact (33) connected to the pseudo input setting device and the contact (34) connected to the combustion furnace outlet temperature detector (23). ) Is operated by the signal of the automatic control device (32) provided with the first control valve (22) at the initial stage of operation at a value preset in the pseudo input setting device of the automatic control device (32). The closed operation is controlled to the limited initial opening of the operation, and air outside the gas explosion limit in the distillation furnace (4) is sent to the distillation furnace (4), and the combustion furnace (1
5) The outlet temperature rises and the combustion furnace outlet temperature detector (2
When the temperature detected in 3) exceeds the temperature preset in the automatic control device (32), the contact connected to the pseudo input setting device of the automatic control device (32) is switched to the contact connected to the combustion furnace outlet temperature detector (23). Automatically controls the opening and closing of the first control valve (22) in proportion to the output condition of the combustion furnace outlet temperature detector (23), and sends primary air to the dry distillation furnace (4) to incompletely burn solid fuel. After gasification, a combustion furnace (15) connected to the distillation furnace (4)
In order to introduce this incomplete combustion gas to complete combustion,
The signal emitted by the flue gas concentration detector (11) installed in the most downstream smoke exhaust pipe (10) is used to output the secondary air fan (9) to the secondary air blower pipe (35) connected to the outlet. The air control valve (13) is controlled to open and close proportionally to supply an optimum amount of secondary air for combustion in the combustion furnace (15). Further, a combustion furnace outlet static pressure detector ( 31) Automatic static pressure control valve (8) installed in the flue downstream of the waste heat recovery unit (25) in proportion to the signal generated by the waste heat recovery unit (25), and the static pressure inside the furnace is optimized for combustion in the combustion furnace (15) Solid state characterized in that the static pressure in the furnace of the distillation furnace (4), the combustion furnace (15), the waste heat recovery device (25) and the combustion furnace (15) is controlled in relation to each other. Fuel combustion control method. 2. A waste heat recovery device (2) connected in series with a first control valve (22) provided in a blower tube (18) connected to an outlet of a primary air fan (14) for supplying primary air to a dry distillation furnace (4). 25) The second control valve (2) operated by the signal of the load fluctuation detector (26)
8) The output of the load fluctuation detector (26) is designed to increase the opening when the heat input demand of the waste heat recovery device (25) is large, and to decrease the opening when the heat input demand is small. 2. The solid fuel combustion control method according to claim 1, wherein the second control valve (28) is proportionally opened / closed by a signal. 3. An air blower pipe (18) for supplying primary air to a dry distillation furnace (4) to obtain air to an ignition burner (19), and the first blower pipe (18) provided in the blower pipe (18). An automatic air setting valve (20) for an ignition burner is provided downstream of the control valve (22) and the second control valve (28) in response to a combustion start / combustion stop signal of the ignition burner (19). An ignition burner combustion start signal at a temperature lower than a preset temperature in an ignition temperature detector (21) closes an automatic air setting valve for an ignition burner (20) to a preset angle, suppresses an air flow, and controls an ignition burner (19). The automatic combustion air setting valve (20) for the ignition burner is fully opened in response to an ignition burner combustion stop signal at a temperature equal to or higher than a preset temperature in the ignition temperature detector (21). Fully open automatic air setting valve (20) for ignition burner Ignition burner at No. (19)
The ignition air burner (19) is cut off and the ignition burner (19) is stopped after the ignition combustion, and the automatic air setting valve (20) for the ignition burner is kept fully open during the operation of the gasification combustion device. The solid fuel combustion control method according to claim 2. 4. The combustion function of the pilot burner (16) is stopped when the amount of light detected by the flame detector (17) becomes equal to or more than the amount of light preset in the pilot burner control device (36).
4. The combustion of the pilot burner (16) is started without delay when the light amount detected by the flame detector (17) becomes equal to or less than a light amount set in the pilot burner control device (36). The solid fuel combustion control method according to the above.