JP2009203335A - Fuel gas producing method and tar producing method from biomass thermally cracked oil, method for recovering sensible heat possessed by coke oven gas, method for recovering sensible heat possessed by converter gas, and method for increasing calorific value of converter gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel gas producing method, producing a fuel of high quality from a biomass thermally cracked oil obtained by thermally treating biomass without increasing the cost, a method for effectively recovering sensible heat possessed by coke oven gas, and a method for increasing combustion calorific value of converter gas. <P>SOLUTION: The fuel gas producing method from biomass thermally cracked oil comprises bringing a biomass thermally cracked oil generated by thermally treating biomass into contact with a coke oven gas from a coke oven 1 and thermally decomposing the biomass thermally cracked oil to thereby generate a fuel gas. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a method for producing fuel gas from biomass pyrolysis oil obtained by heat treating biomass, a method for producing tar, a method for recovering sensible heat of coke oven gas in a coke production process, and for metal refining such as iron making. The present invention relates to a method for recovering sensible heat of converter gas generated from a converter and a method for increasing the calorific value of the converter gas.

(1) Use of biomass pyrolysis oil <Definition of biomass and conventional use of biomass>
Biomass is a renewable, organic resource that is not a fossil resource. Biomass is a continuously renewable resource because it uses solar energy and is produced from water and carbon dioxide. Since biomass is an organic substance, carbon dioxide is emitted when it is burned. However, the carbon contained in this is derived from carbon dioxide absorbed from the atmosphere by photosynthesis during the growth process, so even if biomass is used as a whole, the amount of carbon dioxide in the atmosphere is not increased. It can be considered that. This property is called carbon neutral. Biomass is forestry (saw-mill waste, thinned wood, paper waste, etc.), agriculture (rice straw, straw, sugar cane, rice straw, vegetation, etc.), livestock (livestock waste, etc.) Etc.), waste (garbage, garden trees, construction waste, sewage sludge, etc.).

  In recent years, the role of biomass energy has been emphasized in relation to global warming issues. However, even though woody biomass such as thinned wood, sawdust, building waste, and packing materials is discharged in large quantities, it is mainly incinerated except for some being used as fuel chips etc. It is not used as a current situation.

  There are various methods of using biomass as energy. As disclosed in Patent Document 1, for example, liquid fuel is produced by mixing biomass with a petroleum-based organic solvent and heat-treating it. There is something to use. The method of obtaining biomass by fermenting biomass has many pretreatments, saccharification treatments, fermentation treatments and treatment steps, and the method for obtaining liquid fuel by heat treating biomass is a relatively simple process. It is excellent in a certain point. Also, in the method of fermenting biomass, it is necessary to select a biomass species suitable for fermentation such as cereals, and competition with the use as food is regarded as a problem, but the method of obtaining liquid fuel by heat treating biomass is basically Is excellent in that it can use any kind of biomass.

  Liquids obtained by heat treating biomass (hereinafter referred to as biomass pyrolysis oil) include oils (also referred to as bio-oil) obtained by rapid pyrolysis of biomass at about 500 ° C. in an oxygen-free state, biomass This includes oils obtained as a by-product when gasifying (partial combustion) and oils obtained as a by-product when carbonizing biomass.

(2) Effective use of coke oven gas retained heat
On the other hand, in the steel production process using a blast furnace using coke, to discharge a lot of CO _2, CO ₂ emissions at steel plants is an important problem.

In order to reduce the CO ₂ emission amount, how to effectively use the exhaust heat generated in the steel works is a major point.

  In that sense, the amount of exhaust heat from coke ovens that produce coal by carbonization is large, and exhaust heat recovery has been addressed in the past.

<Description of coke oven and use of conventional coke oven gas>
In the coke oven, carbonization chambers and combustion chambers are alternately arranged via partition walls, coal is charged into the carbonization chamber, fuel is combusted in the combustion chamber adjacent to the carbonization chamber, and the coal in the carbonization chamber passes through the partition walls. Coke is produced by heating and dry distillation. The volatile matter in the coal is gasified and collected from each carbonization chamber through a rising pipe provided in each coke chamber. This coke oven gas (CO gas) is cooled, separated from tar, etc., purified, and then coke oven. It is used as fuel for steelmaking plants.

  The typical composition of coke oven gas is 50-60% by volume of hydrogen, 25-35% by volume of methane, 5-8% by volume of carbon monoxide, 2-5% by volume of carbon dioxide, and 3-7% by volume of nitrogen.

  The technology for recovering the sensible heat of coke after coke production is recovered by coke dry quencher (CDQ), which recovers heat when extinguishing and cooling reddish coke with inert gas such as nitrogen gas. In contrast, the coke oven gas is discharged from the coke oven at a high temperature of 600 to 800 ° C., and a large amount of tar is contained in the coke oven gas even though the sensible heat is enormous. As a result, sensible heat recovery and utilization technology has not been sufficiently established.

  Patent Document 2 discloses a method in which an indirect heat exchanger is provided in a coke oven riser and the sensible heat of coke oven gas is recovered.

  Patent Document 3 discloses that a coke oven gas accompanied by heavy hydrocarbons is passed through a hydrocarbon cracking catalyst reactor to convert heavy hydrocarbons into light hydrocarbons using sensible heat of the coke oven gas. A method is disclosed.

(3) Effective utilization of the amount of heat stored in the converter gas In addition, the steelworks are working on the recovery of exhaust heat from the converter gas generated from the converter.

<Description of converter and use of conventional converter gas>
The main function of the converter is to decarburize the hot metal with pure oxygen gas. There are types such as top blowing converter and bottom blowing converter depending on the pure oxygen gas blowing method, but recently, top bottom blowing converter, which takes advantage of both features, has become the mainstream in steelmaking. In any case, it has the function of directly reacting carbon and oxygen in hot metal to decarburize as carbon monoxide.

  Regardless of the type of converter, converter gas with a high CO concentration is generated. There are combustion equipment (full boiler method, half boiler method) and non-combustion method equipment (OG method) to treat this converter gas. Currently, the OG method that recovers the converter gas without burning is the mainstream. It is. The OG method is an abbreviation for Oxygen Converter Gas Recovery System, which recovers converter gas without burning it, processes it, and uses it as fuel gas.

  The typical composition of the converter gas for the OG process is 1 to 2% by volume of hydrogen, 70 to 80% by volume of carbon monoxide, 10 to 15% by volume of carbon dioxide, and 10 to 15% by volume of nitrogen.

  Since the converter gas is as high as about 1500 ° C. at the furnace port of the converter, converter gas sensible heat recovery equipment (OG boiler) that installs a boiler in the OG treatment equipment and recovers steam is becoming widespread. However, most of the cases where sensible heat recovery is carried out are parts of the converter gas flue called the radiant part where the temperature is relatively low, and the gap between the furnace port part and the flue and its vicinity are seen from the outside. There is a problem that sensible heat recovery is technically difficult and the equipment is expensive in the vicinity of the furnace opening such as the covering hood and skirt, especially at high temperatures.

In Patent Document 4, a synthetic resin such as waste plastic is introduced into a converter or a converter gas flue, and the synthetic resin is pyrolyzed using sensible heat of a high-temperature converter gas to produce a fuel gas. A method of conversion is disclosed.
JP 2006-063310 A JP 58-76487 A JP 2003-55671 A JP 2000-192129 A

  However, the use of biomass pyrolysis oil obtained by heat-treating the above-described conventional biomass, the use of coke oven gas retained heat, and the use of converter gas retained heat have not been made sufficiently, and the following problems Is leaving.

<Problems in the use of conventional biomass pyrolysis oil>
As seen in Patent Document 1, biomass pyrolysis oil is attracting attention as a carbon neutral liquid fuel, but its quality as a fuel is low. In other words, because it contains a lot of moisture and has a high oxygen content, the calorific value is less than half that of petroleum-based fuel oil. It is limited and difficult to apply to engines and high-efficiency power generation facilities. In addition, biomass pyrolysis oil has a problem that it has a low pH of 2 to 3, is easily separated into layers, and is not uniform, and there are many restrictions when used as fuel.

  In order to solve the problem of low quality of biomass pyrolysis oil as a fuel, there is a method to improve the quality as fuel by reforming biomass pyrolysis oil by hydrogenation reaction, etc. Cost. Also, studies are underway to gasify biomass pyrolysis oil to convert it to high concentration hydrogen, but the cost is still high. Thus, it is expensive to improve the quality as fuel by reforming or converting hydrogen into biomass pyrolysis oil, and there is a limit to improving the quality.

  Thus, while biomass pyrolysis oil has attracted attention as a carbon neutral liquid fuel, it is difficult to use it effectively because of its low quality as a fuel.

<Challenges in using the amount of heat stored in coke oven gas>
In the method of using the coke oven gas retained heat amount using the indirect heat exchanger according to Patent Document 2, tar adhesion accompanying the coke oven gas and coking progress to the outer surface of the heat transfer tube, pressure loss increases, and In particular, there is a problem that the heat transfer efficiency is lowered, and it is difficult to recover heat stably for a long time.

  Further, the method of Patent Document 3 has a problem that the catalyst is poisoned by the sulfur compound contained in the coke oven gas, the catalyst life is remarkably shortened, and it is difficult to operate stably for a long period of time. There is a problem that it is expensive to install a hydrogenolysis catalyst reactor.

  As described above, the technology for recovering the sensible heat of coke oven gas has not been sufficiently established, and at present, there is a problem that direct cooling is performed by a large amount of water spray and heat is not effectively recovered.

<Problems in using the amount of heat stored in converter gas>
In the method of utilizing the amount of heat stored in the converter gas according to Patent Document 4, since halogen components such as chlorine are mixed in synthetic resin such as waste plastic, the equipment is damaged by hydrogen chloride generated by pyrolysis, or dioxin There was a problem that would occur. In addition, when a synthetic resin composed mainly of carbon and hydrogen is pyrolyzed, oxygen is insufficient in the converter gas atmosphere, so fuel gas such as hydrogen and methane is also generated. There is a problem that the synthetic resin cannot be efficiently converted into fuel gas.

  The present invention has been made in view of such circumstances, and a method for producing a fuel gas capable of producing high-quality fuel from biomass pyrolysis oil obtained by heat treating biomass without increasing costs, It is an object of the present invention to provide a method for effectively recovering sensible heat of coke oven gas and converter gas. Another object of the present invention is to provide a method for increasing the combustion calorific value of converter gas.

  As a result of the inventor's investigation, biomass pyrolysis oil obtained by heat-treating biomass has a property that combustible gas components can be easily obtained by pyrolysis compared to petroleum heavy oil and coal tar. I found. The temperature suitable for pyrolyzing biomass pyrolysis oil to obtain combustible gas is found to be around 800-1000 ° C., and it is just in the temperature range where the coke oven gas possessed sensible heat can be used effectively. I found.

  As a result, the present invention has been conceived.

  The fuel gas production method according to the present invention is characterized in that a biomass pyrolysis oil produced by heat treating biomass is brought into contact with a coke oven gas, and the biomass pyrolysis oil is pyrolyzed to produce a fuel gas.

In accordance with the present invention, it was confirmed whether pyrolysis and gasification of biomass pyrolysis oil proceeded in coke oven gas. As a result, pyrolysis and gasification proceeded in coke oven gas, and combustible gas was highly efficient. It was confirmed that it was obtained. Here, the components of the gas obtained from biomass pyrolysis oil are mainly composed of H ₂ , CO, CH ₄ , C ₂ H ₄ , C ₂ H ₆ , CO _2, etc. High quality gas. Thus, the fuel gas can be produced from the biomass pyrolysis oil by bringing the biomass pyrolysis oil into contact with the coke oven gas and pyrolyzing and gasifying it with the sensible heat of the coke oven gas.

  According to the present invention as described above, it is possible to effectively use the retained sensible heat of the coke oven gas that has not been effectively used so far.

  In addition, it was found that tar produced by pyrolyzing biomass pyrolysis oil with coke oven gas contains many high-value components such as benzene. The tar generated from the biomass pyrolysis oil is separated from the coke oven gas together with the coal tar component in the coke oven gas, and useful components can be recovered.

  As described above, by thermally decomposing biomass pyrolysis oil in contact with coke oven gas, the gasified gas component is effectively used as fuel gas, and tar component is also effectively used. Furthermore, the retained sensible heat of the coke oven gas can be used effectively.

  In the present invention, biomass pyrolysis oil can be blown into at least one of the inside of the ascending pipe and the upper part of the coke oven. During the coke production, the coke oven gas temperature inside the riser pipe and the upper part of the coke oven is about 800 ° C and 1000 ° C, respectively, which is suitable for blowing pyrolyzed biomass pyrolysis oil and gasifying it. Therefore, the method of blowing in these places is effective.

  In this invention, it is preferable to inject biomass pyrolysis oil with the supply amount of 0.1 to 1.5 weight% with respect to the raw material coal quantity in a coke oven.

  The amount of biomass pyrolysis oil suitable for pyrolysis by contacting biomass pyrolysis oil with coke oven gas was investigated. If the amount of biomass pyrolysis oil blown into the coke oven gas is too small, the effect of using the sensible heat of the coke oven gas is not sufficient, and if too much, the amount of carbide adhering to the inner wall of the riser pipe increases. It turned out that it may be unfavorable for operation. As a result of further examination of this point, the effect is sufficiently obtained if the weight of the biomass pyrolysis oil to be injected with respect to the weight of the raw coal supplied into the coke oven is 0.1 wt% or more and 1.5 wt% or less. I found that no problem occurred. If the amount is 1.5% or less, the increase in the amount of substances causing the adhering carbides and the decrease in the rate of adhering carbides due to the decrease in the temperature of the ascending pipe part due to endothermic reaction cancel each other, and as a result It can be estimated that the increase in the amount of carbide adhering to the surface does not occur.

  The present invention also relates to pyrolyzing biomass pyrolysis oil to obtain tar, and this tar production method comprises contacting biomass pyrolysis oil produced by heat treatment of biomass with coke oven gas, It is characterized by pyrolyzing biomass pyrolysis oil to produce tar. This tar can be obtained separately from the fuel gas by obtaining the fuel gas by pyrolysis of the biomass pyrolysis oil.

  Furthermore, depending on the components of the biomass pyrolysis oil, by using the sensible heat of the coke oven gas for pyrolysis and gasification, fuel gas with a calorific value that is higher than that of the biomass pyrolysis oil can be obtained. It turns out that it is obtained.

  This means that the sensible heat energy of coke oven gas can be converted into chemical energy of fuel gas by utilizing the sensible heat of the coke oven gas to pyrolyze and gasify the biomass pyrolysis oil by endothermic reaction. Means.

  The fuel gas production method according to the present invention is characterized in that a biomass pyrolysis oil produced by heat treating biomass is brought into contact with a converter gas, and the biomass pyrolysis oil is pyrolyzed to produce a fuel gas.

According to the present invention, it was confirmed whether pyrolysis and gasification of biomass pyrolysis oil proceeded in the converter gas. As a result, pyrolysis and gasification proceeded in the converter gas, and the combustible gas was highly efficient. It was confirmed that it was obtained. Here, the components of the gas obtained from biomass pyrolysis oil are mainly composed of H ₂ , CO, CH ₄ , C ₂ H ₄ , C ₂ H ₆ , CO _2, etc. High quality gas. Thus, the fuel gas can be produced from the biomass pyrolysis oil by bringing the biomass pyrolysis oil into contact with the converter gas and pyrolyzing and gasifying it with the sensible heat of the converter gas.

  According to the present invention as described above, the sensible heat of the converter gas that has not been effectively used so far can be effectively used.

  In the present invention, the biomass pyrolysis oil can be blown into at least one of the inside of the converter, the converter gas hood, the skirt, and the converter gas flue. The converter gas hood or skirt portion refers to the hood portion or skirt portion that covers the gap between the furnace port portion and the flue and the vicinity thereof from the outside.

  In the present invention, the biomass pyrolysis oil produced by heat-treating biomass is brought into contact with the converter gas, and the fuel gas produced by pyrolyzing the biomass pyrolysis oil is mixed with the converter gas to thereby convert the converter gas. The calorific value can be increased.

  Until now, many studies have been conducted to obtain flammable gas by pyrolyzing petroleum heavy oil and coal tar using sensible heat of coke oven gas and converter gas. In the case of using pyrolysis oil, it was found that the efficiency of obtaining combustible gas was remarkably high compared with the case of petroleum heavy oil and coal tar. In addition, when combustible gas is obtained from heavy petroleum oil or coal-based tars, the treatment of by-product char, heavy components and residues becomes a problem, but when biomass pyrolysis oil is used. These are excellent in that they are less likely to cause problems.

  In the present invention, as described above, the biomass pyrolysis oil produced by heat treating the biomass is brought into contact with the coke oven gas, and the biomass pyrolysis oil is pyrolyzed to produce fuel gas and tar. You can get high calorie fuel gas and high value tar.

  Thus, according to the present invention, the retained sensible heat of the coke oven gas that has not been effectively used so far can be used effectively.

  In addition, it was found that tar produced by pyrolyzing biomass pyrolysis oil with coke oven gas contains many high-value components such as benzene. The tar generated from the biomass pyrolysis oil is separated from the coke oven gas together with the coal tar component in the coke oven gas, and useful components can be recovered.

  Thus, by thermally decomposing biomass pyrolysis oil in contact with coke oven gas, the gasified gas component is effectively used as fuel gas, and tar component is also effectively used. Furthermore, the retained sensible heat of the coke oven gas can be used effectively.

  In the present invention, as described above, the biomass pyrolysis oil produced by heat treating the biomass is brought into contact with the converter gas, and the biomass pyrolysis oil is pyrolyzed to produce fuel gas. The fuel gas can be obtained.

  As described above, according to the present invention, it is possible to effectively utilize the sensible heat of the converter gas that has not been effectively utilized until now.

  Moreover, the calorific value of the converter gas can be increased by mixing the fuel gas generated by bringing the biomass pyrolysis oil into contact with the converter gas into the converter gas.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a coke oven, and the coke oven 1 is formed with a carbonization chamber in which coal as a raw material (hereinafter referred to as “coking coal”) is fed, and the carbonization chamber and a partition wall facing each other. And a combustion chamber. By the combustion of the fuel supplied from the outside to the combustion chamber, the raw coal in the carbonization chamber is indirectly heated through the partition walls in an oxygen-free state and dry-distilled. By this dry distillation, coke is obtained as a solid content and coke oven gas is obtained as a gas content. The coke oven gas is taken out from the riser 2 provided at the upper portion of the coke oven. Gaseous tar generated in the process of carbonization is contained in the coke oven gas. Such a coke oven 1 itself is publicly known, and further details are omitted.

  An injector 3 that injects biomass pyrolysis oil from the outside into the riser 2 is attached to the riser 2 of the coke oven 1.

  The riser 2 is connected to a purifier 4 for separating and purifying tar from coke oven gas via a flue. The refining device 4 has an outlet 4A for taking out the separated tar and some char at the lower part, and is connected to a storage holder 5 for storing fuel gas as a clean gas after refining.

  The storage holder 5 can take out the fuel gas as a product, and is connected to the combustion chamber of the coke oven 1 so that a part of the fuel gas can be used as fuel in the coke oven 1. ing. Of course, the fuel gas may be supplied to the combustion chamber without taking it out as a product.

  In the apparatus of this embodiment, the pyrolysis of the biomass pyrolysis oil and the subsequent processing are performed as follows.

  (1) The biomass pyrolysis oil used in the apparatus of the present embodiment is obtained by heat-treating biomass with another apparatus. Biomass pyrolysis oil includes oils obtained by rapid pyrolysis of biomass at about 500 ° C. in an oxygen-free state, oils obtained when partially burning biomass, and oils obtained when carbonizing biomass Includes.

(2) The biomass pyrolysis oil is sprayed from the injector 3 into the coke oven 1 or into the coke oven ascending pipe 2 by a pump or the like. The temperature of the coke oven gas is 1000 ° C. or higher in the coke oven and about 800 ° C. in the riser pipe. The sprayed biomass pyrolysis oil is heated by the sensible heat of the coke oven gas, evaporated, then pyrolyzed, gas It becomes. Products by pyrolysis gasification are high-calorie gas mainly composed of H ₂ , CO, CH ₄ , CO ₂ , C ₂ H ₄ , C ₂ H ₆ , tar and some char. This pyrolysis gasification reaction is an endothermic reaction, and the sensible heat retained in the coke oven gas is used as latent heat of vaporization and heat of pyrolysis of biomass pyrolysis oil.

  (3) The gas generated by pyrolysis of the biomass pyrolysis oil is refined by the gas refiner 4 already installed at the subsequent stage of the coke oven 1 together with the coke oven gas used for the pyrolysis, Become. The mixed fuel gas in which the gas generated from biomass pyrolysis oil is mixed with the coke oven gas becomes a fuel gas having a calorific value similar to that of the coke oven gas, and is effectively used in the coke oven and each plant in the steelworks. . It can also be sold as a carbon neutral fuel gas in the form of a product. In the present embodiment, as shown in the figure, the fuel gas is used as a product and also used as a fuel in the coke oven 1.

  As a liquid fuel, biomass pyrolysis oil with low calorific value, high water content, and poor stability can be converted to clean and high calorie fuel gas by effectively using coke oven gas sensible heat. . Depending on conditions, the calorie | heat amount of the high calorie gas to produce | generate becomes larger than the calorie | heat amount of the biomass pyrolysis oil which is a raw material. It can be said that the thermal energy of the coke oven gas is converted into chemical energy as fuel, which is an extremely effective utilization form of thermal energy.

Of course, the use of carbon-neutral fuel gas at steelworks leads to a reduction in CO ₂ emissions from fossil fuels emitted from the steelworks.

  (4) On the other hand, the tar generated from the biomass pyrolysis oil and taken out from the refining device 4 contains light components such as benzene, toluene, xylene and the like that are not necessarily contained in the original biomass pyrolysis oil. Benzene, toluene, xylene, etc. have high value as chemical raw materials. Thus, not only clean fuel gas can be obtained from biomass pyrolysis oil, but also tar containing a high-valued light component can be obtained, and economic efficiency can be further improved. These light components are separated and refined by a coal tar recovery and processing process in equipment (not shown) already installed at the subsequent stage of the coke oven together with the coal tar components contained in the coke oven gas, and are sold as chemical raw materials.

  (5) In addition, the solid content such as char that is slightly produced from the biomass pyrolysis oil and taken out from the refining device 4 is also produced in the coke production process and contained in the coke oven gas, and also in the subsequent stage of the coke oven. It is collected and recycled by existing processing equipment (not shown). Even if solids contained in small amounts in biomass pyrolysis oil still remain after heat treatment, they are treated and recycled in the same way as the existing treatment equipment after the coke oven, making it difficult to use biomass pyrolysis as liquid fuel. Various problems can be solved in using oil.

  In this invention, it turned out that there exists a suitable composition range of biomass pyrolysis oil in order to pyrolyze biomass pyrolysis gas and to obtain more fuel gas. The composition of the preferred biomass pyrolysis oil is such that C is 70% by weight or less, O is 20% by weight or more, and H is 6% by weight or more.

  Pyrolysis experiments were conducted on various biomass pyrolysis oils and coal tar for comparison. The result is as follows.

  The test oils used in the experiment are biomass pyrolysis oil Nos. 1 to 4 and coal tar.

  Biomass pyrolysis oil No. 1 and No. 2 were obtained by rapid pyrolysis at about 500-600 ° C. in an oxygen-free atmosphere using palm fruit empty fruit bunch (EFB) chips as raw materials. Oil. Biomass pyrolysis oil No. 3 is an oil obtained by rapid pyrolysis at about 500 to 600 ° C. in an oxygen-free atmosphere using wood chips as a raw material. Biomass pyrolysis oil No. 4 is an oil produced as a by-product during the gasification reaction using wood chips as raw materials and air and water vapor as gasification agents. Coal tar is a tar obtained when coke is obtained from coal in a coke oven.

    Table 1 shows the composition (unit wt%), moisture content (unit wt%), and low calorific value (unit kcal / kg) of biomass pyrolysis oil Nos. 1 to 4 and coal tar.

  The test oil shown in Table 1 is dropped into a heated quartz tube, pyrolyzed at 1000 ° C. in a nitrogen gas stream, and the obtained gas and char are analyzed. The results are shown in Table 2. The cold gas efficiency of the generated gas is a value obtained by dividing the lower calorific value of the generated gas by the lower calorific value of the supplied test oil. The char generation rate is a value obtained by dividing the weight of the generated char by the weight of the supplied test oil. Each test was performed twice, and the average value is shown in Table 2.

  All of the biomass pyrolysis oil is pyrolyzed and gasified at 1000 ° C. which is the same as the temperature in the coke oven, has a lower char generation rate than coal tar, is easily pyrolyzed, and has a large amount of gas. Moreover, it was confirmed that the cold gas efficiency of the gas generated from the biomass pyrolysis oil is high, and a fuel gas having a high calorific value can be obtained when producing the fuel gas from the biomass pyrolysis oil.

  The above pyrolysis experiment was performed in a nitrogen gas atmosphere to facilitate analysis of the generated gas, but it was confirmed that a similar fuel gas can be obtained by pyrolyzing biomass pyrolysis oil even in a coke oven gas atmosphere. .

Moreover, the calorific value of the gas obtained by pyrolyzing the biomass pyrolysis oil is 3500 to 3700 kcal / m ³ , which is the calorific value of a general converter gas (a gas recovered unburned). It was confirmed that the calorific value was greater than 2200-2500 kcal / m ³ . The biomass pyrolysis oil is contacted with the converter gas and thermally decomposed to generate fuel gas, and the heat generated from the converter gas can be increased by mixing it with the converter gas.

It is a schematic block diagram of the apparatus of one Embodiment of this invention.

Explanation of symbols

1 Coke oven 2 Rising pipe

Claims (9)

  A method for producing fuel gas from biomass pyrolysis oil, comprising bringing biomass pyrolysis oil produced by heat-treating biomass into contact with coke oven gas and pyrolyzing the biomass pyrolysis oil to produce fuel gas.   2. The biomass pyrolysis oil according to claim 1, wherein the biomass pyrolysis oil is brought into contact with the coke oven gas by blowing the biomass pyrolysis oil into at least one of the inside of the riser pipe and the upper part of the coke oven. Fuel gas production method from   The biomass heat according to claim 1 or 2, wherein the biomass pyrolysis oil is blown at a supply amount of 0.1 wt% or more and 1.5 wt% or less with respect to the amount of raw coal in the coke oven. A method for producing fuel gas from cracked oil.   A method for producing tar from biomass pyrolysis oil, comprising bringing biomass pyrolysis oil produced by heat-treating biomass into contact with coke oven gas and pyrolyzing the biomass pyrolysis oil to produce tar.   Coke oven gas characterized in that biomass pyrolysis oil produced by heat-treating biomass is brought into contact with coke oven gas, and the biomass pyrolysis oil is pyrolyzed by sensible heat of coke oven gas to generate fuel gas. Recovering sensible heat possessed by   A method for producing fuel gas from biomass pyrolysis oil, comprising bringing biomass pyrolysis oil produced by heat-treating biomass into contact with a converter gas and pyrolyzing the biomass pyrolysis oil to produce fuel gas.   The biomass pyrolysis oil is brought into contact with the converter gas by blowing the biomass pyrolysis oil into at least one of the inside of the converter, the converter gas hood, the skirt, and the converter gas flue. 6. A method for producing fuel gas from biomass pyrolysis oil according to 6.   A converter gas characterized in that a biomass pyrolysis oil produced by heat treating biomass is brought into contact with a converter gas, and the biomass pyrolysis oil is pyrolyzed by sensible heat of the converter gas to generate a fuel gas. Recovering sensible heat possessed by   The heat generated from the converter gas is characterized in that the biomass pyrolysis oil produced by heat treating the biomass is brought into contact with the converter gas, and the fuel gas produced by pyrolyzing the biomass pyrolysis oil is mixed with the converter gas. How to increase the amount.

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