JP2011225686A - Gasification power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasification power generation system easily and exactly performing combustion continuity decision of a combustible gas and reducing the cost for combustion continuity decision of the combustible gas.SOLUTION: A first flame sensor 41 detecting both of a flame from a burner part 302B and a flame from a discharge pipe 36, and a second flame sensor 42 detecting the flame from only the discharge pipe 36 are provided in an excessive gas combustion device 15 and when a gasification furnace controller 37 and an engine power generator controller 38 determine that flames are detected by the first flame sensor 41 and the second flame sensor 42, an engine power generator 13 is started.

Description

  The present invention relates to a gasification power generation system that generates power by generating a combustible gas, and more particularly, to a gasification power generation system including an engine power generation apparatus that generates power by burning a combustible gas.

  Conventionally, a solid carbonaceous material such as biomass is heated in a gasification furnace to generate a combustible gas such as biogas, and the biogas is burned with an engine power generator to generate power, while being generated in the gasification furnace. There is known a gasification power generation system in which surplus gas that has not been supplied to the engine power generation apparatus is burned by the surplus gas combustion apparatus among the biogas produced (see, for example, Patent Document 1).

  By the way, since biomass as a material of biogas is heterogeneous, the calorific value of biogas is likely to fluctuate as compared with liquefied petroleum gas (LP gas). Therefore, conventionally, whether or not the biogas generated in the gasification furnace can be supplied to the engine power generator, that is, continuously burns in the engine power generator (hereinafter referred to as “self-combustion”). ) "Human judgment", "Judgment by gas analyzer", and "Judgment by timer control" are known as means for judging whether or not it is possible (hereinafter referred to as "self-burning judgment"). .

  The “human judgment” is to determine the self-combustibility of biogas by the operator igniting the biogas and checking the state of the flame.

  The “determination by the gas analyzer” is to determine biogas self-combustibility by analyzing the components of the biogas with a gas analyzer such as a gas chromatograph.

  The “determination based on timer control” predicts the time required from the start of the gasifier to the generation of self-combustible biogas, and the biogas can self-combust when the estimated time set by the timer elapses It is what is regarded as something.

  And when it can be judged that it is biogas which can be self-combusted by these self-flammability judgment means, the engine power generator is started.

JP 2009-249600 A

  However, the “human judgment”, “judgment by gas analyzer”, and “judgment by timer control” have the following problems.

  In other words, since the “human judgment” cannot automate the determination of self-flammability, the operator's work is complicated, the determination of self-flammability of biogas cannot be simplified, and an error in judgment by the operator occurs. There is a problem that it is easy and it is difficult to accurately determine the self-flammability of biogas. Further, the “judgment by the gas analyzer” has a problem that the cost for determining the self-flammability of biogas increases because gas analyzers such as gas chromatographs are generally expensive. In addition, the “judgment based on timer control” is difficult to accurately determine the biogas flammability because the biomass is inhomogeneous and the prediction accuracy of the time when self-burnable biogas is generated is low. There was a problem that there was.

  The present invention has been made in view of the situation as described above, and can easily and accurately determine the flammability of the flammable gas, and can reduce the cost for determining the flammability of the flammable gas. Provide power generation system.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  That is, in Claim 1, the gasification furnace which heats solid carbonaceous material and produces | generates a combustible gas, The engine electric power generator which burns this combustible gas, and generates electric power, It produced | generated with the said gasification furnace A surplus gas combustion device that combusts surplus gas that has not been supplied to the engine power generation device among combustible gases, a gas passage for introducing a combustible gas into the surplus gas combustion device, the gasification furnace, and the engine power generation device In the gasification power generation system provided with a control device that controls the operating state of the above, a flame detection means for detecting a flame from a gas outlet portion of the gas passage is provided in the surplus gas combustion device, and the control device comprises: When it is determined that a flame is detected by the flame detection means, the engine power generator is started.

  According to a second aspect of the present invention, the surplus gas combustion device can introduce a combustible gas through the gas passage and a bypass passage branched from the gas passage. Both the flame from the outlet portion and the flame from the gas outlet portion of the bypass passage are arranged at positions where they can be detected.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, the determination of the flammability of the flammable gas is simple and accurate by automatically determining the flammability of the flammable gas based on whether or not a flame is detected in the surplus gas combustion device. can do. Moreover, since an expensive gas analyzer is not required, the cost for determining the flammability of the combustible gas can be reduced.

  In claim 2, even when the combustible gas is not introduced into the surplus gas combustion device through the gas passage, the combustible gas is reliably introduced into the surplus gas combustion device because the combustible gas is introduced into the surplus gas combustion device through the bypass passage. In addition to ensuring the determination of the flammability of the flammable gas, the flame detection means for both the gas passage and the bypass passage reduces the cost of determining the flammability of the flammable gas. be able to.

The figure which shows the gasification electric power generation system which concerns on 1st embodiment of this invention. Side surface sectional drawing which shows a water-sealed tank. Side surface sectional drawing which shows a water level adjustment tank. The figure which shows the control block of the gasifier controller and engine generator controller which concern on 1st embodiment of this invention. The figure which similarly shows a control flow. The figure which similarly shows a control time chart. The figure which shows the control block of the gasifier controller and engine generator controller which concern on 2nd embodiment of this invention. The figure which similarly shows a control flow. The figure which similarly shows a control time chart.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  First, the whole structure of the gasification power generation system 1 which concerns on 1st embodiment of this invention is demonstrated with reference to FIG.

  The gasification power generation system 1 includes an input hopper 2, an input conveyor 3, a gasification furnace 4, a cyclone 5, a heat exchanger 6, a cooling tower 7, a water tank 8, a scrubber 9, a filter 10, an induction blower 11, and a pretreatment unit 12. , The engine power generation device 13, the water sealing tank 14, the surplus gas combustion device 15 and the like. The biogas as the combustible gas generated in the gasification furnace 4 flows in the order of the cyclone 5, the heat exchanger 6, the scrubber 9, the filter 10, and the induction blower 11, and the engine power generation device 13 side downstream of the induction blower 11. And flow to the surplus gas combustion device 15 side.

  Biomass as a solid carbonaceous material is stored in the input hopper 2, and the biomass in the input hopper 2 is input into the gasification furnace 4 by the input conveyor 3. Examples of the solid carbonaceous material include fossil fuels such as coal, in addition to biomass such as livestock excrement, food waste, paper, black liquor, sewage sludge, wood-based waste / unused material, agricultural non-edible parts, and resource crops. Is also used.

  In the gasification furnace 4, the biomass is incompletely burned to generate biogas. The generated biogas is introduced into the cyclone 5 through the gas pipe 16. This biogas is a combustible gas mainly composed of carbon monoxide, and the biogas contains impurities such as soot, tar, and dust.

  In the cyclone 5, relatively large dust contained in the biogas is removed by centrifugation. The biogas from which large dust and the like have been removed by the cyclone 5 is introduced into the heat exchanger 6 through the gas pipe 17.

  A gas pipe (not shown) through which biogas flows is provided in the heat exchanger 6, and the biogas in the gas pipe is washed and cooled with washing water, and cooling water that flows around the gas pipe Cooled by. The biogas cleaned and cooled by the heat exchanger 6 is introduced into the scrubber 9 through the gas pipe 18.

  Washing water is stored in the scrubber 9, and the biogas is washed and cooled by diving in the washing water in the scrubber 9. The biogas cleaned and cooled by the scrubber 9 is introduced into the filter 10 through the gas pipe 25.

  In the filter 10, relatively small dust contained in the biogas is removed by filtration. The biogas from which dust and the like have been removed by the filter 10 is introduced into the attracting blower 11 through the gas pipe 28.

  Here, the cooling water supplied to the heat exchanger 6 is stored in the cooling tower 7, and the cooling water in the cooling tower 7 is introduced into the heat exchanger 6 through the water distribution pipe 19. Then, the cooling water in the water distribution pipe 19 is pumped to the heat exchanger 6 side by the pump 20, and the cooling water that has cooled the biogas by the heat exchanger 6 is led out to the cooling tower 7 by the water distribution pipe 21.

  The washing water supplied to the heat exchanger 6 and the scrubber 9 is stored in the water storage tank 8, and the washing water in the water storage tank 8 is introduced into the heat exchanger 6 through the water distribution pipe 22 and distributed. It is introduced into the scrubber 9 through a water distribution pipe 26 branched from the water pipe 22. The washing water in the water distribution pipe 22 is pumped to the heat exchanger 6 side and the scrubber 9 side by the pump 23, and the washing water washed and cooled by the heat exchanger 6 is stored in the water storage tank 8 through the water distribution pipe 24. On the other hand, the cleaning water that has been cleaned and cooled with the scrubber 9 is guided to the water storage tank 8 through the water distribution pipe 27.

  Now, in the attracting blower 11, the biogas upstream of the attracting blower 11 is sucked and discharged downstream. That is, while the upstream side of the attracting blower 11 has a negative pressure, the downstream side of the attracting blower 11 has a positive pressure. Therefore, the biogas upstream of the attracting blower 11 is attracted to the downstream side by the attracting blower 11.

  The biogas attracted by the attracting blower 11 is introduced into the engine power generator 13 through the first gas pipe 29. On the other hand, surplus biogas (the surplus that was not supplied to the engine power generation device 13 among the biogas generated in the gasification furnace 4) is surplus gas in the second gas pipe 30 branched from the first gas pipe 29. It is introduced into the combustion device 15.

  The engine power generator 13 includes a gas engine using biogas as a fuel, a power generator driven by the gas engine, and the like. The engine power generation device 13 according to the present embodiment is a cogeneration system that generates power with the power generation device and uses exhaust heat of the gas engine for hot water supply, air conditioning, or the like. Biogas from which impurities have been removed by the pretreatment unit 12 is supplied to the engine power generation device 13.

  In the surplus gas combustion device 15, surplus biogas is combusted. A water-sealed tank 14 is provided in the middle of the second gas pipe 30 on the upstream side of the surplus gas combustion device 15.

  Next, the water sealing tank 14 will be described with reference to FIG.

  As shown in FIG. 2, the water sealing tank 14 is filled with water up to a predetermined water level. The water level in the water sealing tank 14 can be adjusted from the lowest water level Hmin to the highest water level Hmax (water level adjustment range ΔH = Hmax−Hmin) by the water level adjusting tank 31 (see FIG. 3). An overflow pipe 34 for discharging excess water exceeding the maximum water level Hmax is provided on the side surface of the water sealing tank 14. That is, the height of the upper end portion of the overflow pipe 34 becomes the maximum water level Hmax of the water sealing tank 14.

  An upstream gas pipe 301 is disposed on the upstream side of the water sealing tank 14, while a downstream gas pipe 302 is disposed on the downstream side of the water sealing tank 14. That is, the upstream gas pipe 301 and the downstream gas pipe 302 constitute the second gas pipe 30.

  The upstream gas pipe 301 extends substantially horizontally from the first gas pipe 29 (see FIG. 1) side to the water sealing tank 14 side and is inserted into the water sealing tank 14. The first gas pipe 29 and the water sealing tank 14 are communicated with each other via an upstream gas pipe 301. In the water sealing tank 14, the upstream gas pipe 301 is bent downward and extends substantially vertically, and the gas outlet portion 301 </ b> A of the upstream gas pipe 301 is opened (opened downward) in water. The gas outlet 301A is disposed at a position (water depth H1) lower than the water surface in the water sealing tank 14.

  And lower gas hole 301B * 301B ... and upper gas hole 301C * 301C ... are formed in the tube wall of the upstream side gas pipe 301 in the gas outlet part 301A vicinity in order from gas outlet part 301A. . .. And the lower gas holes 301B, 301B,... Are arranged along the circumferential direction of the upstream gas pipe 301. The heights of the upper gas holes 301C, 301C,... Coincide with the height of the lowest water level Hmin.

  A gas inlet 302 </ b> A of the downstream gas pipe 302 is connected to the upper side surface of the water sealing tank 14. The water sealing tank 14 (the space on the water surface in the water sealing tank 14) and the surplus gas combustion device 15 are communicated with each other via the downstream gas pipe 302. The downstream gas pipe 302 extends substantially horizontally from the upper side surface of the water-sealed tank 14 toward the surplus gas combustion device 15, bends downward, and extends substantially vertically. The downstream gas pipe 302 that extends substantially vertically is bent toward the surplus gas combustion device 15 and extends substantially horizontally, and is inserted into the inside from the lower side surface of the surplus gas combustion device 15 and is bent upward. .

  A burner portion 302B is provided at the end of the downstream gas pipe 302 in the surplus gas combustion device 15. Further, a pilot burner 35 for igniting the biogas discharged from the burner unit 302B is provided on the side surface of the surplus gas combustion device 15.

  On the other hand, one end portion of the bypass pipe 33 is connected to the horizontal portion of the upstream gas pipe 301. The bypass pipe 33 branches from the upstream gas pipe 301 of the second gas pipe 30, extends substantially vertically downward from the horizontal portion of the upstream gas pipe 301, is bent toward the surplus gas combustion device 15, and is substantially horizontal. It is extended to. The bypass pipe 33 extending substantially horizontally is bent upward on the lower side of the surplus gas combustion device 15.

  One end portion of the discharge pipe 36 is connected to the other end portion of the bypass pipe 33, and the other end portion of the discharge pipe 36 is inserted into the inside from the lower side of the surplus gas combustion device 15. The other end of the discharge pipe 36 is disposed in the vicinity of the burner portion 302B of the second gas pipe 30 (downstream gas pipe 302).

  With such a configuration, biogas is introduced into the water sealing tank 14 through the upstream gas pipe 301. The biogas in the upstream gas pipe 301 is discharged into the water in the water sealing tank 14 from the gas outlet 301A, the lower gas holes 301B, 301B,... And the upper gas holes 301C, 301C,.

  Here, the water pressure in the water sealing tank 14 acts on the biogas discharged from the upstream gas pipe 301. That is, the unit volume weight of water in the water sealing tank 14 is γw, the water depth at the gas outlet 301A position is H1, the water depth at the lower gas holes 301B, 301B,... H2, and the upper gas holes 301C, 301C,.・ ・ Assuming that the water depth at the position is H3, the biogas discharged from the gas outlet 301A includes the water pressure P1 (= γw × H1), the biogas discharged from the lower gas holes 301B, 301B,. , Water pressure P2 (= γw × H2), water pressure P3 (= γw × H3) acts on the biogas discharged from the upper gas holes 301C, 301C,.

  In this way, the amount of biogas supplied to the surplus gas combustion device 15 is reduced by the water pressure in the water sealing tank 14 acting on the biogas discharged from the upstream gas pipe 301. As a result, the amount of biogas supplied to the engine power generation device 13 increases, and the pressure of the biogas in the first gas pipe 29 increases.

  Then, the biogas discharged from the upstream gas pipe 301 floats on the water surface in the water sealing tank 14 and flows into the downstream gas pipe 302 from the gas inlet portion 302A. Then, the biogas in the downstream gas pipe 302 is discharged from the burner unit 302 </ b> B and introduced into the surplus gas combustion device 15.

  In this way, the biogas discharged from the burner unit 302B is ignited by the pilot burner 35 and burned by the surplus gas combustion device 15.

  A part of the biogas in the upstream gas pipe 301 flows into the bypass pipe 33. The biogas in the bypass pipe 33 is discharged from the discharge pipe 36 and introduced into the surplus gas combustion device 15. In other words, the biogas in the second gas pipe 30 (upstream gas pipe 301) is introduced into the surplus gas combustion device 15 by the bypass pipe 33 without passing through the water sealed tank 14 (bypassing the water sealed tank 14). Is done.

  Thus, the biogas discharged from the discharge pipe 36 is ignited by the pilot burner 35 and burned by the surplus gas combustion device 15.

  Next, the water level adjustment tank 31 will be described with reference to FIG.

  As shown in FIG. 3, water supplied to the water sealing tank 14 is stored in the water level adjustment tank 31. The water level adjustment tank 31 and the water sealing tank 14 are communicated with each other via a communication pipe 32 with a valve 321. The water level in the water level adjustment tank 31 and the water level in the water seal tank 14 are balanced via the communication pipe 32 in which the valve 321 is opened.

  The water level adjustment tank 31 is provided with a water supply pipe 311 for supplying water into the water level adjustment tank 31 and a drain pipe 312 for discharging water in the water level adjustment tank 31. The water supply pipe 311 is provided with a valve (not shown) with a ball tap. When the water level in the water level adjustment tank 31 becomes lower than the set water level, the valve opens and water from the water supply pipe 311 is supplied to the water level adjustment tank. 31 is supplied. Thereafter, when the water level in the water level adjusting tank 31 reaches the set water level, the valve is closed and the supply of water from the water supply pipe 311 is stopped.

  With such a configuration, when water is supplied into the water level adjustment tank 31 through the water supply pipe 311, the water level in the water level adjustment tank 31 rises and the communication pipe 32 in which the valve 321 is opened opens the water level adjustment tank 31. Water is introduced into the water sealing tank 14 and the water level in the water sealing tank 14 also rises. Then, in the second gas pipe 30, it becomes difficult for the biogas to flow to the surplus gas combustion apparatus 15 side (the biogas in the upstream gas pipe 301 is difficult to be discharged into the water seal tank 14), and the surplus gas combustion apparatus 15 The biogas supply amount to the engine power generation device 13 increases while the biogas supply amount to the engine power generation device 13 increases, and the biogas pressure in the first gas pipe 29 increases.

  On the other hand, when the water in the water level adjustment tank 31 is discharged through the drain pipe 312, the water level in the water level adjustment tank 31 is lowered, and the water in the water sealing tank 14 is adjusted in the water level through the communication pipe 32 in which the valve 321 is opened. The water level in the water sealing tank 14 is also lowered by being led to the tank 31. Then, in the second gas pipe 30, it becomes easy for the biogas to flow to the surplus gas combustion device 15 side (the biogas in the upstream gas pipe 301 is easily discharged into the water sealing tank 14), and the surplus gas combustion device 15 The biogas supply amount to the engine power generation device 13 decreases and the biogas pressure in the first gas pipe 29 decreases.

  It should be noted that the height of the upper end surface of the overflow pipe 34 can be changed so that the water level in the water sealing tank 14 can be lowered.

  Next, the gasifier controller 37 and the engine generator controller 38 will be described with reference to FIG.

  As shown in FIG. 4, the gasification power generation system 1 is provided with a gasification furnace controller 37 and an engine power generation device controller 38. The gasifier controller 37 and the engine generator controller 38 are connected to be communicable.

  The engine power generator controller 38 includes a central processing unit, a storage device, and the like. The engine power generator controller 38 is connected to the engine power generator 13 and a gas control valve 46 and shut-off valves 47 and 47 provided in the first gas pipe 29.

  The operating state of the engine power generator 13 is controlled by the engine power generator controller 38. Various detection signals from the engine power generator 13 are transmitted to the engine power generator controller 38.

  A control signal from the engine power generator controller 38 is transmitted to the gas control valve 46. Based on the control signal, the opening amount of the gas control valve 46 is changed, whereby the amount of biogas supplied to the engine power generator 13 is controlled.

  A control signal from the engine power generator controller 38 is transmitted to the shutoff valves 47 and 47. Biogas is supplied to the gas control valve 46 by opening the shut-off valves 47 and 47 based on the control signal.

  The gasifier controller 37 includes a central processing unit, a storage device, and the like. In the gasification furnace controller 37, the supply pressure of biogas suitable for supply to the engine power generator 13 (hereinafter simply referred to as “supply pressure”) P0 and the frequency of power supplied to the induction blower 11 from a power source (not shown). (The rotational speed of the attracting blower 11) is set. The gasifier controller 37 includes a gasifier 4, an inverter 39, a pressure sensor 40, a first flame sensor 41, a second flame sensor 42, shut-off valves 43 and 43, an ignition transformer 44 of a pilot burner 35, and an excess gas combustion device. Blower 45 is connected.

  The operating state of the gasifier 4 is controlled by the gasifier controller 37. A control signal from the gasification furnace controller 37 is transmitted to the gasification furnace 4, and various detection signals from the gasification furnace 4 are transmitted to the gasification furnace controller 37.

  A control signal from the gasifier controller 37 is transmitted to the inverter 39. Based on the control signal, the frequency of the electric power supplied to the induction blower 11 is increased or decreased by the inverter 39, whereby the rotation speed of the induction blower 11 is controlled.

  The pressure sensor 40 detects the biogas pressure (hereinafter referred to as “discharge pressure”) P at the gas outlet of the attracting blower 11. That is, the pressure sensor 40 detects the pressure of the biogas before branching to the engine power generation device 13 side and the surplus gas combustion device 15 side. A detection signal of the pressure sensor 40 is transmitted to the gasifier controller 37.

  The 1st flame sensor 41 is arrange | positioned in the position which can detect both the flame from the burner part 302B, and the flame from the discharge pipe 36. FIG. When either one of the two flames is detected by the first flame sensor 41, a detection signal of the first flame sensor 41 is transmitted to the gasifier controller 37. As the first flame sensor 41, a temperature sensor, an ultraviolet (UV) sensor, or a rectifying sensor is used.

  The second flame sensor 42 is disposed at a position where only the flame from the discharge pipe 36 can be detected. That is, the second flame sensor 42 is disposed at a position where the flame from the discharge pipe 36 can be detected and the flame from the burner unit 302B cannot be detected. When the flame from the discharge pipe 36 is detected by the second flame sensor 42, a detection signal from the second flame sensor 42 is transmitted to the gasifier controller 37. As the second flame sensor 42, a temperature sensor, an ultraviolet (UV) sensor, or a rectifying sensor is used.

  The shut-off valves 43 and 43 are provided in a gas pipe 48 that introduces LP gas as fuel to the pilot burner 35. A control signal from the gasifier controller 37 is transmitted to the shut-off valves 43 and 43. LP gas is supplied to the pilot burner 35 by opening the shutoff valves 43 and 43 based on the control signal.

  A control signal from the gasifier controller 37 is transmitted to the ignition transformer 44. Based on the control signal, a voltage from a power source (not shown) is boosted by the ignition transformer 44 and discharged, whereby the LP gas from the pilot burner 35 is ignited.

  A control signal from the gasifier controller 37 is transmitted to the surplus gas combustion apparatus blower 45. Based on the control signal, air is introduced into the surplus gas combustion device 15 by the surplus gas combustion device blower 45, so that the combustible gas remaining in the surplus gas combustion device 15 is expelled (pre-purge). .

  Next, the control contents of the gasifier controller 37 and the engine generator controller 38 will be described with reference to FIGS.

  In step 1, a control signal for starting the gasification furnace 4 is transmitted from the gasification furnace controller 37 to the gasification furnace 4.

  In step 2, when a control signal is transmitted from the gasifier controller 37 to the gasifier 4 in step 1, a control signal is also transmitted to the blower 45 for the surplus gas combustion apparatus, and based on the control signal. The surplus gas combustion apparatus blower 45 is activated.

  In step 3, after the combustible gas remaining in the surplus gas combustion device 15 is purged (pre-purge), a control signal is transmitted from the gasification furnace controller 37 to the ignition transformer 44 and the shut-off valves 43 and 43. Then, LP gas is supplied to the pilot burner 35 by opening the shut-off valves 43 and 43 based on a control signal to the shut-off valves 43 and 43. Further, the LP gas from the pilot burner 35 is ignited based on the signal to the ignition transformer 44.

  In step 4, the gasifier controller 37 determines whether a flame is detected by the first flame sensor 41. If it is determined that a flame is detected by the first flame sensor 41, that is, one of the flame from the burner unit 302B and the flame from the discharge pipe 36 is detected, the process proceeds to step 5. In step 5, the gasification furnace 4 is started. On the other hand, if it is determined that the flame is not detected by the first flame sensor 41, that is, neither the flame from the burner unit 302B nor the flame from the discharge pipe 36 is detected, the process proceeds to step 6, At 6, the failure is notified.

  In step 7, it is judged whether or not a flame is detected by the second flame sensor 42. If it is determined that a flame is detected by the second flame sensor 42, that is, it is determined that a flame from the discharge pipe 36 is detected, the process proceeds to step 8. On the other hand, when it is determined that the flame is not detected by the second flame sensor 42, that is, the flame from the discharge pipe 36 is not detected, Step 7 is repeated again.

  In step 8, a control signal is transmitted from the gasifier controller 37 to the shut-off valves 43 and 43 and the engine generator controller 38. Then, the supply of LP gas to the pilot burner 35 is shut off by closing the shut-off valves 43 and 43 based on the control signal to the shut-off valves 43 and 43. Further, when the control signal is transmitted from the engine power generator controller 38 to the engine power generator 13 based on the control signal to the engine power generator controller 38, the engine power generator 13 is started based on the control signal. .

  As described above, the gasification power generation system 1 according to the first embodiment of the present invention includes a gasification furnace 4 that generates biomass by heating biomass, and an engine generator 13 that generates power by burning the biogas. And surplus gas combustion device 15 that burns the surplus of the biogas generated in gasification furnace 4 that has not been supplied to engine power generation device 13, and a gas passage for introducing biogas into surplus gas combustion device 15 A gasification power generation system comprising a second gas pipe 30, a control device having a gasification furnace controller 37 for controlling the operation state of the gasification furnace 4 and an engine power generation device controller 38 for controlling the operation state of the engine power generation device 13. 1, in the surplus gas combustion device 15, the flame from the burner section 302 </ b> B as the gas outlet section of the second gas pipe 30 and the gas discharge of the bypass pipe 33 A first flame sensor 41 as a first flame detection means for detecting both of the flames from the discharge pipe 36 as a part, and a second flame detection means as a second flame detection means for detecting only the flame from the discharge pipe 36 of the bypass pipe 33. A flame sensor 42 is provided, and the gasifier controller 37 and the engine power generator controller 38 start the engine power generator 13 when it is determined that a flame is detected by the first flame sensor 41 and the second flame sensor 42.

  With such a configuration, the determination of self-flammability of biogas is made simple and accurate by automatically determining the self-flammability of biogas based on whether or not a flame is detected in surplus gas combustion device 15. be able to. Moreover, since an expensive gas analyzer is not required, the cost for determining the self-combustibility of biogas can be reduced.

  In this embodiment, the gasifier controller 37 and the engine power generator controller 38 constitute a control device. However, the controller is a single controller that controls the operating states of both the gasifier 4 and the engine power generator 13. A control device can also be configured.

  Next, a gasification power generation system 1A according to a second embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 7, the gasification power generation system 1A according to the second embodiment includes only the first flame sensor 41, that is, the gasification power generation according to the first embodiment in that the second flame sensor 42 is not provided. It is different from the system 1.

  As shown in FIGS. 8 and 9, the control content from step 10 to step 30 is the same as the control content from step 1 to step 3 according to the first embodiment.

  In step 40, the gasifier 4 is started.

  In step 50, the gasifier controller 37 determines whether or not a predetermined time (t1 shown in FIG. 9) has elapsed since the shutoff valves 43 and 43 were opened in step 30. When it is determined that the predetermined time t1 has elapsed since the shutoff valves 43 and 43 were opened, the process proceeds to step 60. On the other hand, if it is determined that the predetermined time t1 has not elapsed since the shut-off valves 43 and 43 were opened, step 50 is repeated again.

  In step 60, the control signal is transmitted from the gasifier controller 37 to the shut-off valves 43 and 43, so that the shut-off valves 43 and 43 are closed based on the control signal, and the LP gas is supplied to the pilot burner 35. Supply is cut off.

  In step 70, it is determined whether or not a flame is detected by the first flame sensor 41. Then, the flame is detected by the first flame sensor 41 for a predetermined time (t2 shown in FIG. 9) after the shutoff valves 43 and 43 are closed, that is, from the flame from the burner portion 302B and the discharge pipe 36. If it is determined that one of the flames is detected, the process proceeds to step 80. On the other hand, no flame was detected by the first flame sensor 41 for a predetermined time (t2 shown in FIG. 9) after the shut-off valves 43 and 43 were closed, that is, the flame from the burner section 302B and the discharge pipe 36. When it is determined that none of the flames from is detected, the routine proceeds to step 30 where the shut-off valves 43 and 43 are opened and the biogas is ignited by the pilot burner 35. Thereafter, step 40 and subsequent steps are repeated.

  In step 80, a control signal is transmitted from the gasifier controller 37 to the engine power generator controller 38. Based on this control signal, a control signal is transmitted from the engine power generator controller 38 to the engine power generator 13 so that the engine power generator 13 is activated based on the control signal.

  As described above, in the gasification power generation system 1 </ b> A according to the second embodiment of the present invention, the surplus gas combustion device 15 includes the second gas pipe 30 and a bypass pipe as a bypass passage branched from the second gas pipe 30. 33, the biogas can be introduced, and the first flame sensor 41 can detect both the flame from the burner portion 302B of the second gas pipe 30 and the flame from the discharge pipe 36 of the bypass pipe 33. Be placed.

  With such a configuration, even when biogas is not introduced into the surplus gas combustion device 15 through the second gas pipe 30, biogas is introduced into the bypass pipe 33 through the bypass pipe 33, so It is possible to reliably determine the self-flammability of the biogas, and to determine the self-flammability of the biogas by the first flame sensor 41 that is used for the second gas pipe 30 and the bypass pipe 33. Cost can be reduced.

DESCRIPTION OF SYMBOLS 1 Gasification power generation system 1A Gasification power generation system 4 Gasification furnace 13 Engine power generation device 15 Surplus gas combustion device 30 Second gas pipe (gas passage)
33 Bypass pipe (bypass passage)
36 Discharge pipe (gas outlet of bypass passage)
37 Gasifier controller 38 Engine power generator controller 41 First flame sensor (first flame detection means)
42 Second flame sensor (second flame detection means)
302B Burner part (gas outlet part of gas passage)

Claims (2)

A gasification furnace for heating the solid carbonaceous material to generate a combustible gas;
An engine power generator that generates power by burning the combustible gas;
Surplus gas combustion device for burning surplus gas that has not been supplied to the engine power generator among combustible gas generated in the gasification furnace;
A gas passage for introducing a combustible gas into the surplus gas combustion device;
In the gasification power generation system comprising the gasification furnace and a control device that controls the operating state of the engine power generation device,
Flame detecting means for detecting a flame from the gas outlet of the gas passage in the surplus gas combustion device is provided,
The said control apparatus starts the said engine electric power generation apparatus, when it is judged that the flame was detected by the said flame detection means, The gasification electric power generation system characterized by the above-mentioned. Combustible gas can be introduced into the surplus gas combustion device through the gas passage and a bypass passage branched from the gas passage.
2. The gas according to claim 1, wherein the flame detection means is disposed at a position where both a flame from a gas outlet of the gas passage and a flame from a gas outlet of the bypass passage can be detected. Power generation system.

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