JP4942980B2 - Method and apparatus for detecting the degree of progress of thermal decomposition of waste, and method and apparatus for thermal decomposition of waste - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a waste pyrolysis treatment method and apparatus for effectively using combustible waste, particularly rubber waste such as waste tires, as fuel and raw material.

  Conventional methods for treating combustible waste such as rubber waste such as waste tires and plastics have been mainly incineration or landfill, but promotion of a recycling-oriented society has become a major social issue in recent years. Therefore, effective utilization technology of these combustible wastes is required. As a waste processing method for the purpose of effective use of combustible waste, for example, as described in Non-Patent Documents 1, 2, and 3, the waste is heated in a pyrolysis furnace to generate pyrolysis gas and pyrolysis. After generating the residue, the pyrolysis gas is cooled in the latter stage, and the tar component contained in the pyrolysis gas is liquefied and separated and recovered, and the pyrolysis gas after tar separation is used as fuel gas or chemical raw material gas, A waste pyrolysis method has been proposed in which tar is used as fuel oil and the like, and pyrolysis residue is used as carbonaceous fuel or metal raw material. The pyrolysis furnace of the waste pyrolysis method includes an external heating pyrolysis method represented by a rotary kiln pyrolysis furnace, a partial combustion pyrolysis represented by a fluidized bed pyrolysis furnace, a moving bed pyrolysis furnace, etc. However, when recovering high-calorie gas, it is possible to apply externally-heated heat that does not involve the partial decomposition of pyrolysis gas by introducing combustion air or dilution of pyrolysis gas by introducing fluidized gas. The decomposition method is a particularly suitable method. The thermal decomposition temperature varies depending on the type of waste, but is usually about 500 to 700 ° C. for rubber waste and plastic waste.

Japan Rubber Association Journal, Vol. 59, No. 10, P565-567 (1986), page 565, Fig. 1 "Recycling Technology Research Presentation Proceedings" 6th, P89-92 (1998), p. 92, Fig. 4 "Cement Manufacturing Technology Symposium" No.57, P90-P97 (2000), p.91, Fig.1 JP2003-139314 JP-A-11-344213

  However, as a problem with waste pyrolysis methods using existing external thermal pyrolysis furnaces, such as rotary kiln pyrolysis furnaces, when the processing conditions such as waste feed rate and particle size change, the pyrolysis furnace It is mentioned that the degree of progress of pyrolysis in the interior changes and the yield and properties of the pyrolysis product at the outlet of the pyrolysis furnace vary.

  Therefore, as a method for detecting the degree of progress of the thermal decomposition of waste, for example, as described in Patent Document 1, the pyrolysis gas temperature is measured in the pyrolysis furnace outlet pipe, and the pyrolysis furnace temperature is determined according to the pyrolysis gas temperature. A method for adjusting the amount of heating and a temperature of pyrolysis residue measured at a specific location in the pyrolysis furnace as described in Patent Document 2, and the amount of waste supplied to the pyrolysis furnace according to the pyrolysis residue temperature A method of adjusting is proposed. However, the problem of the method of Patent Document 1 is that, even if the pyrolysis gas temperature at the furnace outlet is the same, when the furnace temperature history and the residence time under the furnace outlet temperature condition are different until reaching the outlet temperature condition, When the speed is high and the residence time under the furnace outlet temperature condition is long, or when the temperature rise rate is slow and the residence time under the furnace outlet temperature condition is short, the degree of thermal decomposition in the furnace, that is, the inside of the furnace Because there is a difference in the progress of gasification reaction of volatile matter (VM) in waste, the secondary decomposition reaction of generated pyrolysis gas, the progress of polycondensation reaction, etc., measure only the furnace outlet gas temperature. However, it is difficult to grasp the degree of thermal decomposition of waste. On the other hand, the problem of the method of Patent Document 2 is that it is difficult to detect the degree of thermal decomposition when there is a local temperature distribution in the furnace. For example, a normal rotary kiln pyrolysis furnace cannot completely block air entering the furnace, so air enters from the kiln rotor seal part, waste supply part, etc., and part of the pyrolysis gas enters the furnace. When a local temperature distribution such as a heat spot is likely to be formed in the furnace due to combustion, and the fluctuation of the intrusion air amount condition occurs, the degree of thermal decomposition progress in the furnace accompanying the fluctuation of the local temperature distribution condition such as the heat spot Changes. However, it is difficult for the method of Patent Document 2 that measures the pyrolysis residue temperature at a specific location in the furnace to detect a change in the degree of progress of pyrolysis due to the variation in the intrusion air amount condition described above. Furthermore, as another problem that the method of Patent Document 2 has, when applied to waste such as waste tires that are prone to blockage in the furnace due to wires, a thermocouple inserted in the furnace for measuring the pyrolysis residue temperature is used. The point which wires get entangled and the discharge stability of a thermal decomposition residue deteriorates is mentioned.

  Therefore, the present invention provides a method and an apparatus capable of easily detecting the degree of progress of pyrolysis in an external heating type pyrolysis furnace, which has been difficult with the conventional method, and further provides a target gas yield, oil It is an object of the present invention to provide a waste pyrolysis method and apparatus capable of achieving a yield.

In order to solve the problem, the gist of the present invention is as follows (1) to (5).
(1) In the first invention, a rubber waste is supplied to an external heating type pyrolysis furnace and pyrolyzed to generate a pyrolysis gas containing a tar component, and tar is separated from the pyrolysis gas. , A method for detecting the degree of thermal decomposition of waste in a thermal decomposition method using tar and pyrolysis gas after separation , the flow rate of the pyrolysis gas after separation, and the CH contained in the pyrolysis gas after separation ₄ Measure the gas concentration and the supply flow rate of the waste. From the measured pyrolysis gas flow rate, CH ₄ gas concentration in the pyrolysis gas , and the waste supply flow rate, the CH per waste input amount ₄ Calculate the CH ₄ gas generation unit, which is the amount of gas generated , monitor the calculated CH ₄ gas generation unit , and detect the degree of thermal decomposition in the pyrolysis furnace based on the fluctuation. This is a characteristic method for detecting the degree of thermal decomposition of waste. The
(2) In the second invention, the rubber waste is supplied to an external heating type pyrolysis furnace and pyrolyzed to generate a pyrolysis gas containing a tar component, and the tar is separated from the pyrolysis gas. , A pyrolysis method using tar and pyrolysis gas after separation , the flow rate of pyrolysis gas after separation , the CH ₄ gas concentration contained in the pyrolysis gas after separation , and the supply of waste a flow rate measurement, the flow rate of the measured pyrolysis gas, CH ₄ gas concentration of the pyrolysis gases, and, CH ₄ gas from the supply flow rate of the waste, a CH ₄ gas emission per waste input amount calculating an occurrence intensity, CH ₄ based on the relationship between the pyrolysis gas yield after separation gas generating intensity, the pyrolysis gas yield after separation as is in the range of aim CH ₄ was investigated in advance determined the range of the gas generating intensity or amount in advance investigated CH ₄ gas generation amount Based on the relationship of the tar yield after, the tar yield after separation sought range of CH ₄ gas generating intensity such that the range of aim, external heat temperature of the pyrolysis furnace, wherein the pyrolysis furnace waste moving speed of the inner, or, by adjusting the waste feed rate to the pyrolysis furnace, so that the calculated CH ₄ gas generation intensity is in the range of CH ₄ gas generation intensity obtained the control This is a method for thermally decomposing waste.
(3) A third invention is the waste pyrolysis method according to (2), wherein the waste is a waste tire .
(4) The fourth invention is a device for detecting the degree of thermal decomposition of rubber-based waste, which is a waste supply rate measuring device, a waste supply device, an external thermal pyrolysis furnace, and the external heat A tar separation device for separating tar from a pyrolysis gas containing a tar component generated in a pyrolysis furnace, a flow measurement device for pyrolysis gas after tar separation by the tar separation device, and heat after the tar separation The CH ₄ gas concentration measurement device in cracked gas, and the waste supply rate, pyrolysis gas flow rate, and CH ₄ gas concentration in pyrolysis gas measured by each measurement device are taken and discarded. is thermal decomposition degree of progress of the detection device of waste, comprising a, a CH ₄ gas generation intensity calculation unit for calculating a CH ₄ gas generation intensity is CH ₄ gas emission per object input amount .
(5) A fifth invention is a thermal decomposition apparatus for rubber waste, a waste supply speed measuring apparatus, a waste supply apparatus capable of adjusting a waste supply speed, an external heat temperature and waste movement External heat pyrolysis furnace with adjustable speed, tar separator for separating tar from pyrolysis gas containing tar components generated in the external heat pyrolysis furnace, and after tar separation with the tar separator a flow measuring device of the thermal decomposition gas, the tar CH ₄ gas pyrolysis in the gas after separation and concentration measuring device, waste feed rate the measured at each measuring apparatus, pyrolysis gas flow, and heat and CH ₄ gas generation intensity calculation unit for calculating a CH ₄ gas generation intensity is CH ₄ gas emission per waste input amount takes in the measured values of the CH ₄ gas concentration in the cracked gas was the calculated CH ₄ gas generation intensity is, CH ₄ a predetermined An operation condition control device for controlling at least one of the waste supply speed, the external heat temperature, and the waste movement speed so as to be within the range of the generation unit of waste. Is a thermal decomposition apparatus.

The “pyrolysis gas” as used in the present invention refers to not only the gas immediately after coming out of the external heat pyrolysis furnace, but also the gas after various gas treatments in the post-process, for example, tar components are separated. It includes a gas after tar decomposition after that, and a purified gas after gas purification by removing H ₂ S and HCl.

  According to the present invention, it is possible to easily detect the degree of progress of pyrolysis in an external thermal pyrolysis furnace, which has been difficult with the conventional method, and further, it is possible to perform a waste pyrolysis process that can achieve a target gas yield and oil yield. It becomes possible.

As a result of intensive investigations on the pyrolysis characteristics and the pyrolysis progress detection method of combustible waste, particularly rubber waste, using an external heat type pyrolysis furnace, the present inventors have The generated tar component is mainly composed of aromatic hydrocarbons having an aliphatic side chain, and the external heat type pyrolysis furnace has a longer residence time in the furnace than the partial combustion type pyrolysis furnace. The secondary decomposition reaction of tar components generated by waste pyrolysis tends to proceed even under low temperature conditions of around 700 ° C, and the elimination of the aliphatic side chains of aromatic hydrocarbons accompanying secondary decomposition of tar components And CH ₄ gas is produced, and the amount of CH ₄ gas produced varies depending on the degree of progress of the secondary decomposition of the tar component, and the amount of CH ₄ gas generated per unit amount of waste is measured. This method is used to detect and control the degree of pyrolysis in the pyrolysis furnace. Invented.

  FIG. 1 is a block diagram showing an example of equipment for carrying out the method and apparatus for detecting the degree of progress of thermal decomposition of waste and the method and apparatus for thermal decomposition of waste according to the present invention. The waste 1 is crushed by the crushing device 17, and then charged into the external heat pyrolysis furnace 3 using the waste supply device 2 through the waste supply speed measuring device 14. The waste supply speed measuring device 14 may be built in the waste supply device 2. There is no particular limitation on the method of the external heat type pyrolysis furnace 3 as long as it is an external heat type, and an existing external heat furnace such as a pusher type pyrolysis furnace is used in addition to the most widely used rotary kiln pyrolysis furnace. Is possible. As a waste supply rate measuring method, for example, an existing waste supply rate measuring method such as a load cell type weighing machine can be applied.

The inside of the external heat type pyrolysis furnace 3 is heated to a temperature equal to or higher than the thermal decomposition temperature of the waste by the heating furnace 12 to generate a pyrolysis gas (immediately after generation) 6 and a pyrolysis residue 7. The pyrolysis gas (immediately after generation) 6 is cooled by the tar separation device 4 to separate and recover the tar component 8 and then the tar separation gas 9 is introduced into the gas purification device 5 to introduce harmful gas components such as H ₂ S and HCl and Dusts and mists are removed and the purified gas 10 is recovered. A part of the purified gas 10 is introduced into the CH ₄ gas analyzer 11 to measure the CH ₄ gas concentration. Further, the purified gas flow rate measuring device 15 measures the purified gas flow rate. The CH ₄ generation unit is calculated from the measured CH ₄ gas concentration, purified gas flow rate, and waste supply rate. As the CH ₄ gas concentration measurement method, for example, an existing gas analysis method such as a gas chromatograph analysis method or an infrared absorption gas analysis method can be applied. As a method for measuring the flow rate of the purified gas, for example, an existing gas flow rate measurement method such as an orifice type flow meter can be applied, and an inert gas such as He gas that does not react with the pyrolysis gas is tracer gas in the pyrolysis gas. The gas flow rate may be calculated by adding a small amount continuously and measuring the tracer gas concentration in the pyrolysis gas.

  The obtained pyrolysis products are used as fuel gas and chemical raw material gas for pyrolysis gas, tar components are used as alternative fuel oil such as heavy oil and light oil, and carbonaceous fuel and metal raw material are used for pyrolysis residue Use as

If the pyrolysis conditions in the pyrolysis furnace fluctuate due to changes in the waste supply rate or particle size, etc., the degree of secondary decomposition of tar components in the pyrolysis gas will change, and the amount of CH ₄ gas generated will change. , pyrolysis furnace downstream of CH ₄ gas generation intensity (CH ₄ gas emission per waste charging amount: for example, Nm ³ -CH ₄ gas / t-waste) pyrolysis proceeds in the furnace by monitoring the A change in degree can be detected. For example, when it becomes necessary to perform operations with a temporarily reduced throughput and the waste supply rate to the pyrolysis furnace is reduced, the residence time near the pyrolysis furnace outlet temperature becomes longer and the pyrolysis progress increases. However, by monitoring the CH ₄ gas generation basic unit at the latter stage of the pyrolysis furnace, the degree of increase in the degree of thermal decomposition can be easily detected from the rate of increase of the CH ₄ gas generation basic unit. Further, for example, when the crushing performance is reduced due to a trouble of the crushing device 17 and the waste is not sufficiently crushed and the particle size of the waste to be processed in the pyrolysis furnace is increased, the time required for raising the temperature of the waste However, the progress of pyrolysis in the pyrolysis furnace tends to decrease, but it can be easily detected as a decrease in the CH ₄ gas generation intensity by monitoring the CH ₄ gas generation intensity at the latter stage of the pyrolysis furnace. it can.

  When producing thermal decomposition products such as gas and oil by thermally decomposing waste, it is important to carry out operations so that the production amount and quality of each product are constant. The conventional pyrolysis method is difficult to detect the fluctuation of the pyrolysis progress of the waste in the pyrolysis furnace, so the yield and properties of the pyrolysis products are likely to vary. This pyrolysis method can detect the progress of thermal decomposition of waste in the pyrolysis furnace, so that it is possible to operate with the same amount and quality of pyrolysis products.

As an example in FIGS. 2 to 4, changes in CH ₄ generation unit, tar yield, gas yield, and kinematic viscosity of heavy oil components in tar when a waste tire, which is a kind of rubber waste, is pyrolyzed. The relationship with changes in As pyrolysis proceeds in the furnace, the tar component is secondarily decomposed, and a gas mainly composed of CH ₄ gas is generated by the elimination reaction of the aliphatic side chains of the aromatic hydrocarbons. As shown, the CH ₄ generation unit increases with a decrease in tar yield or an increase in gas yield. Therefore, it is possible to detect the degree of progress of pyrolysis by measuring the pyrolysis gas flow rate, CH ₄ gas concentration, and waste supply rate to calculate the CH ₄ generation source unit. In addition, when the aliphatic side chain of the aromatic hydrocarbon is eliminated by secondary decomposition of the tar component, a polycondensation reaction between the aromatic hydrocarbons occurs to increase the molecular weight. As the progress of decomposition proceeds, the kinematic viscosity of the heavy oil component in tar increases. This change can be predicted from the change in the basic unit of CH ₄ generation and used for quality control.

As a control method, in order to stably control the target gas yield and oil yield (predetermined range), thermal decomposition treatment is performed so that the CH ₄ generation unit is within a certain value or within a certain range. Feedback control of equipment operating conditions. At this time, CH ₄ generation per unit aim is previously 2, it is preferable to create in advance test chart corresponding to the calibration curve as shown in Figure 3. In particular, in the case of changing the product type, it is more desirable to prepare a graph corresponding to the calibration curve in advance because the relationship between the CH ₄ generation basic unit and the pyrolysis gas yield / tar yield changes.

  5 to 7 are block diagrams showing examples of equipment for carrying out the second to third inventions.

In the example of FIG. 5, the CH ₄ gas concentration signal A 1 detected by the CH ₄ gas analyzer 11, the gas flow rate signal A 2 detected by the pyrolysis gas flow rate measuring device 15, and the waste supply amount measuring device 14 are detected. the waste feed rate signal A3 is input to the CH ₄ gas generation intensity calculation unit 16 calculates the CH ₄ gas generating intensity, externally heated pyrolysis furnace so that a predetermined range of CH ₄ gas generation intensity 3 is sent to the pyrolysis furnace outside heat temperature control signal A4, and the amount of heating is controlled by feedback control of the outside heat temperature.

In the example of FIG. 6, the CH ₄ gas concentration signal A 1 detected by the CH ₄ gas analyzer 11, the gas flow rate signal A 2 detected by the pyrolysis gas flow rate measuring device 15, and the waste detected by the waste supply amount measuring device 14. enter the object feed velocity signal A3 to CH ₄ gas generation intensity calculation unit 16 calculates the CH ₄ gas generating intensity, predetermined CH ₄ gas generating intensity range and so as to pyrolysis furnace rotational speed adjustment device A pyrolysis furnace rotation speed control signal A5 is sent to 13 to control the rotation speed of the pyrolysis furnace and adjust the waste movement speed in the external heating pyrolysis furnace 3.

In the example of FIG. 7, the CH ₄ gas concentration signal A 1 detected by the CH ₄ gas analyzer 11 and the pyrolysis gas flow rate signal A 2 detected by the pyrolysis gas flow rate measuring device 15 and the waste supply amount measuring device 14 are detected. waste feed speed signal A3 is input to the CH ₄ gas generation intensity calculation unit 16 calculates the CH ₄ gas generating intensity, predetermined CH ₄ gas generating wastes to be in the range of intensity feeder 2 A waste supply speed control signal A6 is sent to the external heat pyrolysis furnace 3 to adjust the waste supply speed. General waste supply speed adjustment methods such as increasing or decreasing the amount of waste cut out to a waste transfer conveyor or adjusting the cutting speed of a waste feeder such as a screw feeder Means are applicable.

  Here, in the case of stabilizing mainly the gas yield of the pyrolysis product or the tar yield, the external heat temperature of the external thermal pyrolysis furnace, which is the above three operating conditions, You can control any one or more conditions of rotational speed (waste transfer speed) or waste feed speed of the thermal pyrolysis furnace, but stabilize both gas yield and tar yield In order to achieve this, control for reducing the waste supply rate is not preferable, and control is performed by at least one of the external heat temperature of the external thermal pyrolysis furnace and the rotational speed (waste transfer speed) of the external thermal pyrolysis furnace. It is preferable. Moreover, when it is not possible to control with only one operating condition, it can be handled by combining two or more.

5 to 7, CH ₄ gas analysis concentration measurement and pyrolysis gas flow rate measurement were performed using the purified gas after the gas purification device 5, but the CH ₄ gas generation unit is a tar separation device and a gas. Since the position of CH ₄ gas analysis concentration measurement and pyrolysis gas flow rate measurement is subsequent to the external heating pyrolysis furnace 3, there is no particular limitation because it does not change even after passing through the refining device. It is possible to apply a pyrolysis gas 6 after 3, a gas 9 after tar separation after the tar separation device 4, and a purification gas 10 after the gas purification device 5.

An example in which a waste tire, which is a rubber waste, is pyrolyzed at a treatment scale of 100 t / day using the present invention shown in FIG. The pyrolysis furnace uses an externally heated rotary kiln, the heating furnace uses an LNG-fired hot air generator, the tar separator uses a direct cooling type quenching tower and an indirect cooling type condenser, and the gas purification unit uses wet desulfurization. Equipment and wet electrostatic precipitator, CH ₄ gas analyzer uses thermal conductivity detector type gas chromatograph analyzer equipped with auto sampler, and pyrolysis gas flow rate measurement uses He gas in the pyrolysis gas as a tray gas As a fixed amount using a 0.25 Nm ³ / hr mass flow controller, and the He concentration in the pyrolysis gas was measured using a thermal conductivity detector type gas chromatograph analyzer equipped with an autosampler. The target yield of each pyrolysis product was set to a gas yield of 20 ± 2% by mass and a tar yield of 32 ± 2% by mass. Waste is charged into a pyrolysis furnace to produce pyrolysis gas (immediately after generation) and pyrolysis residue, and the pyrolysis gas is cooled in a quenching tower to separate and recover heavy oil components in tar. Light oil components were separated and recovered by cooling with a condenser. After tar separation, the gas was treated with a gas purifier to remove H ₂ S to 10 ppm or less, and dust and mist were removed to obtain a purified gas. . The waste supply rate was measured using a load cell type weighing machine. The CH ₄ concentration was measured by sampling a part of the purified gas at a cycle of 10 minutes and introducing it into a gas chromatograph analyzer. The pyrolysis gas flow rate was calculated from the obtained He concentration analysis value by sampling a part of the purified gas at a period of 10 minutes and introducing it into a gas chromatograph analyzer to measure the He concentration. The waste supply rate, CH ₄ concentration, and pyrolysis gas flow rate data were loaded into a CH ₄ gas generation unit calculation device to calculate the CH ₄ gas generation unit. After the resulting CH ₄ gas generating intensity signals transmitted to the heating furnace to control the furnace temperature to CH ₄ generation per unit is in the range of 55~75Nm ³ / t, CH ₄ generation per unit rises When the heating furnace temperature was lowered and the CH ₄ generation unit decreased, an operation was carried out to raise the heating furnace temperature. The CH ₄ basic unit target value was selected in the above-mentioned range by investigating the relationship between the CH ₄ generation amount, gas yield, and oil yield in advance during trial operation.

As shown in Table 1, the obtained pyrolysis products were purified gas 19 to 21 t / day, tar 31 to 33 t / day, pyrolysis residue 46 to 48 t / day, dust about 1 t / day, and product yield. Was able to operate within the target value range. Tar is recovered as heavy oil about 15-16 t / day and light oil about 16-17 t / day, respectively. Heavy oil is calorific value is about 10,000 kcal / kg and evaluated at 50 ° C within one month. The kinematic viscosity was in the range of 7 to 15 cSt and could be effectively used as a substitute for A heavy oil. Light oil can be effectively used as a light oil substitute with a calorific value of about 10,000 kcal / kg. The purified gas has a calorific value of about 10,000 kcal / Nm ³ and could be used effectively as an alternative to LNG. The pyrolysis residue was able to effectively use about 15 tons / day of metal derived from wires as an iron-making raw material and about 31 to 33 tons / day of carbon as an alternative to pulverized coal fuel. Moreover, about 1 t / day of dust is the main component carbon, which can be effectively used as a pulverized coal fuel substitute.

As described above, in the embodiment, the CH ₄ gas generation unit is calculated, the change in the thermal decomposition progress of the waste is detected, and the CH ₄ gas generation unit is controlled to be within a predetermined range. Therefore, the yield and properties of the thermal decomposition product could be stabilized.
(Comparative example)
As a comparative example, a conventional pyrolysis progress detection and control method that measures the gas temperature in the piping of the pyrolysis furnace outlet and adjusts the heating amount of the pyrolysis furnace according to the gas temperature is used. The same waste tire as in the example was processed at the same processing amount of 100 t / day. As shown in Table 1, the method of the comparative example had a large variation in the yield of each pyrolysis product as compared with the examples, and the production amount management performance of each pyrolysis product was low. Further, the kinematic viscosity at 50 ° C. of the obtained heavy oil was evaluated within a period of 1 month. As a result, it varied within the range of 10 to 50 cSt, and heavy oil having a quality conforming to JIS standard K2205 of heavy oil A (50 ° C. It was difficult to stably produce a kinematic viscosity at 20 cSt or less). As a result of elemental analysis of heavy oil, heavy oil with high kinematic viscosity has an increased C / H ratio, and the conventional method cannot detect the difference in the degree of thermal decomposition, so that overdrying tends to occur. It was found that the polycondensation of aromatic hydrocarbons constituting the tar component proceeded with the progress of secondary decomposition of the tar in the cracked gas in the furnace, leading to an increase in kinematic viscosity.

  In the method of the comparative example managed only by the pyrolysis furnace outlet gas temperature, changes in local temperature distribution conditions in the furnace such as heat spots due to fluctuations in the amount of intrusion air, and the waste charged in the pyrolysis furnace It is impossible to detect changes in the degree of thermal decomposition due to temperature history in the pyrolysis furnace due to variations in raw material conditions such as shape and moisture concentration, and changes in residence time under furnace outlet temperature conditions. The rate and stability of properties were lower than in the examples.

It is a block diagram which shows the installation example of the apparatus which concerns on this invention. Is a diagram illustrating an example of the relationship between the tar yield and CH ₄ generation per unit of time of the rubber waste pyrolysis. Is a diagram illustrating an example of the relationship between the gas yield and CH ₄ generation per unit of time of the rubber waste pyrolysis. Is a diagram illustrating an example of the relationship between the kinematic viscosity and the CH ₄ generation per unit tar Medium Heavy Shitsuyu components during rubber waste pyrolysis. It is a block diagram which shows another example of an installation of the apparatus which concerns on this invention. It is a block diagram which shows another example of an installation of the apparatus which concerns on this invention. It is a block diagram which shows another example of an installation of the apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste 2 Waste supply device 3 External-heat-type pyrolysis furnace 4 Tar separation device 5 Gas purification device 6 Pyrolysis gas (immediately after production)
7 Pyrolysis residue 8 Tar component 9 Gas after tar separation 10 Purified gas 11 CH ₄ gas analyzer 12 Heating furnace 13 Pyrolysis furnace rotation speed adjusting device 14 Waste supply rate measuring device 15 Pyrolysis gas flow rate measuring device 16 CH ₄ gas generating intensity calculation device 17 crushing apparatus A1 CH ₄ gas concentration signal A2 pyrolysis gas flow signal A3 waste feed rate signal A4 pyrolysis furnace externally heated temperature control signal A5 pyrolysis furnace rotational speed control signal A6 waste feed rate control signal

Claims (5)

The rubber waste is supplied to an external thermal pyrolysis furnace and pyrolyzed to generate a pyrolysis gas containing a tar component. The tar is separated from the pyrolysis gas, and the tar and pyrolysis gas after separation are separated. A method for detecting the degree of thermal decomposition of waste in the thermal decomposition method,
The flow rate of the pyrolysis gas after the separation, CH ₄ gas concentration contained in the pyrolysis gas after the separation, and to measure the flow rate of the waste pyrolysis gas the measured flow rate, during pyrolysis gas CH ₄ gas concentration, and, from the supply flow rate of the waste, to calculate the CH ₄ gas generation intensity is CH ₄ gas emission per waste input amount, by monitoring the CH ₄ gas generation intensity which the calculated A method for detecting the degree of thermal decomposition of waste , wherein the degree of thermal decomposition in the pyrolysis furnace is detected based on the variation . The rubber waste is supplied to an external thermal pyrolysis furnace and pyrolyzed to generate a pyrolysis gas containing a tar component. The tar is separated from the pyrolysis gas, and the tar and pyrolysis gas after separation are separated. A thermal decomposition method,
And the flow rate of the pyrolysis gas after the separation, the a CH ₄ gas concentration contained in the pyrolysis gas after separation, the a supply flow rate of waste was measured, the pyrolysis gas the measured flow rate, pyrolysis gas CH ₄ gas concentration in, and, from the supply flow rate of the waste, to calculate the CH ₄ gas generation intensity is CH ₄ gas emission per waste input amount,
Based on the previously investigated CH ₄ relationship pyrolysis gas yield after separation gas generating intensity, the range of CH ₄ gas generating intensity as pyrolysis gas yield after the separation is in the range of aim Seeking
Or, based on the relationship between the CH ₄ gas generation amount and the tar yield after separation investigated in advance, the range of the CH ₄ gas generation unit so that the tar yield after separation is within the target range is obtained,
Adjusting the external heat temperature of the pyrolysis furnace, the waste moving speed in the pyrolysis furnace, or the waste supply speed to the pyrolysis furnace, the calculated CH ₄ gas generation basic unit was obtained. A method for thermally decomposing waste, characterized in that control is performed so as to be within a range of the basic unit of CH ₄ gas generation . The waste pyrolysis method according to claim 2, wherein the waste is a waste tire. A device for detecting the degree of thermal decomposition of rubber waste,
Waste supply rate measuring device, waste supply device, external thermal pyrolysis furnace, tar separation device for separating tar from pyrolysis gas containing tar components generated in the external thermal pyrolysis furnace , A flow measurement device for pyrolysis gas after tar separation by the tar separation device, a concentration measurement device for CH ₄ gas in the pyrolysis gas after tar separation, and a waste supply measured by each of the measurement devices CH ₄ gas generation that calculates the CH ₄ gas generation basic unit that is the amount of CH ₄ gas generation per waste input by taking in the measured values of velocity, pyrolysis gas flow rate, and CH ₄ gas concentration in the pyrolysis gas An apparatus for detecting the degree of progress of thermal decomposition of waste. A thermal decomposition apparatus for rubber waste,
Waste supply rate measuring device, waste supply device capable of adjusting waste supply rate, external heat pyrolysis furnace capable of adjusting external heat temperature and waste transfer speed, and external heat pyrolysis furnace Separation apparatus for separating tar from the pyrolysis gas containing the tar component produced in the above, a flow measurement apparatus for pyrolysis gas after tar separation by the tar separation apparatus, and CH in the pyrolysis gas after tar separation ₄ and concentration measuring device of the gas, the measured waste feed rate in each measuring device, the pyrolysis gas flow, and the CH ₄ gas concentration of the pyrolysis gas per waste input amount takes in the measured values and CH ₄ gas generation intensity calculation unit for calculating a CH ₄ CH ₄ gas generation intensity is the gas generation amount, the calculated CH ₄ gas generating intensity becomes a predetermined range of CH ₄ gas generation intensity The waste feed rate, Kigainetsu temperature, or thermal cracker waste and having an a operation condition control device for controlling at least one of the waste movement speed.

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