1265052 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種熱脫附土壤污染物之系統，且特 別是有關於一種包含多段式螺旋脫附設備的熱脫附土壤 污染物之系統。 【先前技術】 隨著現代工業發展，世界各地的土壤污染問題日益受 到重視，美國環保署（USEPA)於1980年投入研究高效率的 土壤與地下水整治復育相關技術，其中熱脫附技術被公認 為兼具環境衝擊程度低與能源使用效率較高的雙重優點。 熱脫附技術係用於將附著於固體物質之有機或無機 污染物揮發，脫附後的污染物需利用其他系統再處理。 習知的熱脫附系統包括廢棄物先處理及進料單元，熱 脫附至，排氣冷凝、分離及處理系統。此熱脫附系統將污 染物自土壤中分離出來，在熱脫附室造就高溫且缺氧的條 件’將水分、有機物及無機物脫附出成氣態，藉著氣流或 真空系統將揮發後的水分及污染物送入廢氣處理系統。 數種習知的熱脫附系統如旋轉爐、輸送帶式加熱爐與 螺旋熱脫附爐，簡介如下： 1·旋轉爐：使用圓柱形反應槽，槽體稍微傾斜，槽體 一端為燃燒裝置，提供熱以提升土壤至足夠溫度脫附有機 污染物。以土壤與洗滌氣體流向可區分為同向流 (co current)式或對向流（c〇unter-current)式，當圓柱形反應 5 1265052 =接:壤經圓筒輸送，在旋轉爐内充份混合，土壤 範圍較大，並=使土ΐ快速加熱。旋轉乾燥器處理容量 _ 、’可作固定式或移動式設置。 輸送土^▼式加熱爐··輸送帶式加熱爐使用固定金屬帶 序t 土壤經過加敎宮，+ 士窒仏八1265052 IX. Description of the Invention: [Technical Field] The present invention relates to a system for thermally desorbing soil contaminants, and more particularly to a system for thermally desorbing soil contaminants comprising a multi-stage spiral desorption device . [Prior Art] With the development of modern industry, soil pollution problems around the world have received increasing attention. The US Environmental Protection Agency (USEPA) invested in research on high-efficiency soil and groundwater remediation technologies in 1980, in which thermal desorption technology is recognized. It has the dual advantages of low environmental impact and high energy efficiency. Thermal desorption techniques are used to volatilize organic or inorganic contaminants attached to solid materials, and the desorbed contaminants need to be reprocessed using other systems. Conventional thermal desorption systems include waste treatment and feed units, thermal desorption, exhaust condensation, separation and treatment systems. The thermal desorption system separates the pollutants from the soil, creates a high temperature and anoxic condition in the thermal desorption chamber, and desorbs the moisture, organic matter and inorganic matter into a gaseous state, and volatilizes the water by a gas flow or a vacuum system. And the pollutants are sent to the exhaust gas treatment system. Several conventional thermal desorption systems such as rotary furnaces, conveyor belt heating furnaces and spiral thermal desorption furnaces are as follows: 1. Rotating furnace: a cylindrical reaction tank is used, the tank body is slightly inclined, and one end of the tank body is a combustion device. Provide heat to raise the soil to a sufficient temperature to desorb organic pollutants. The flow direction of the soil and the washing gas can be divided into a co current or a countercurrent-current type, and when the cylindrical reaction is 5 1265052 = the soil is transported through the cylinder and charged in the rotary furnace. Mixing, the soil range is large, and = the soil is heated quickly. The rotary dryer handles the capacity _ , ' for fixed or mobile settings. Conveying soil ^▼ type heating furnace ··Conveyor belt heating furnace using fixed metal belt Order t Soil passing through the crowning palace, + 士窒仏八
均均句分佈於輸送帶上，土壤厚 :屬首刀，操作溫度在靴〜飢。輸送帶式加熱 2直接加熱方式，系統可以達到較高的熱脫附溫度，但 二被，熱的土壤並沒有被擾動因此需要較長的滞留時 曰’才能相完全熱脫附土壤污染物的目的。 3·螺旋熱脫附爐：螺旋熱脫附爐主要是由轉軸盥單一 爐體所組成，以轉軸上之螺旋葉片混合並加熱受污染土 壞’-直到水分揮發及污染物脫附進人洗㈣體。轉轴内 通入熱傳導液體作為加熱土壤之熱源，並將熱傳導液體送 回加熱系統以供循環使用，溫度可達26Qt，·轉軸内亦能 以高溫蒸汽作為加熱土壤之熱源，溫度可冑nrc。螺旋 熱脫附爐屬間接加熱爐，熱效率較低且最高的脫附溫度也 受到很大的限制，但因為需要處理的脫附污染物並未與熱 源混合，故後端空氣污染防治設備得以簡化。 因此，本發明所提供的熱脫附土壤污染物之系統包含 能以多段式螺旋脫附設備有效提高被污染土壤之處理速 率，和能大幅提高脫附溫度的加熱系統，並可減少設置熱 脫附系統所需之用地。 iv 1265052 【發明内容】 /解決上述和其他的問題，並且達到本發明所主張的 、，點’本發明提供—種熱脫附土壤污染物之系統，用 • 以处理含有有機或無機污染物的土壌。 因此本發明的目的就是在提供一種熱脫附土壤污染 物^系、、先，此系統包含之多段式螺旋脫附設備可分階段處 又污木之土壤。依照本發明一較佳實施例，第一階段之 φ ^疋脫附設備可將土壤預熱並脫水，第二階段之螺旋脫附 • 設備則可進行有機或無機污染物之熱脫附。 • 文巧染土壤在有夾層之螺旋脫附設備裡，被轉軸由入 口處不斷地攪拌並緩緩推進至另一端之出口處。夾層中通 入由加熱系統所產生之高溫氣體，與轉轴内通入之高溫液 體同作為加熱土壤之熱源。藉由控制氣體的溫度，可分 別達成上述兩階段之目的。 本鲞月的另一目的是在提供一種熱脫附土壤污染物 • 之系、、先此系統包含之加熱系統可提供更高的脫附溫度， ” 並更有效率地處理受污染的土壤。依照本發明一較佳實施 . 例，在螺旋脫附設備之夾層中通入由此加熱系統所產生之 南溫氣體作為加熱土壤的熱源之一。此加熱系統可為生質 能氣化/燃燒爐。 、 【實施方式】 本發明包含之熱脫附設備為多段式螺旋脫附設備，後 述之較佳實施例中，以兩段式螺旋脫附設備作為處理受污 7 !265〇52 染土壤之熱脫附設備。 4參照第1圖，其繪示依照本發明一較佳實施例的一 種熱脫附土壤污染物之系統1〇〇之示意圖。此系統100首 先將受污染土壤輸送至第一螺旋脫附爐11〇進行預熱及脫 水處理。此第一螺旋脫附爐110中的熱源係來自轉軸與螺 旋葉片内部所通入約175t的蒸汽，與内、外筒夾層所通 入約25(TC的生質能燃燒尾氣。土壤在爐内被轉軸與葉片 充分的攪拌、乾燥並預熱至約12〇它後再輸送至第二螺旋 脫附爐120内。而脫附出的氣體則抽送至旋風集塵器ui， 將水汽與粉塵分離後排出系統外。 第二螺旋脫附爐120係作為處理土壤中有機或無機污 染物之熱脫附設備。第二螺旋脫附爐12〇内之溫度可維持 在550 C到600°C之間，爐内高溫由轉軸與螺旋葉片内循 環約350°C的工作流體與内、外筒夾層通入約925。〇的高 /凰生負肖b燃燒排氣所提供。此工作流體可為熱媒油。 以高溫進行熱脫附污染物，處理完畢的土壤則由第二 螺旋脫附爐12G之出口端排出。爐中的高溫可以將土壤内 的有機或無機污染物完全且快速的脫附而出，脫附出的污 染物同樣抽送至旋風集塵器121將蒸汽與粉塵分離後排入 一後端的空氣污染控制系統（但第丨圖中並未繪示此空氣 污染控制系統），進行適當的安定後處理後排出。 上述之第一螺旋脫附爐110與第二螺旋脫附爐12〇之 主要熱源均來自一高效率之生質能氣化爐130。由生質能 氣化爐130產生約925^的的高溫燃燒尾氣，先通入第二 8 1265052The average sentence is distributed on the conveyor belt, and the soil is thick: it is the first knife, and the operating temperature is in the boots ~ hunger. Conveyor belt heating 2 direct heating method, the system can reach a higher thermal desorption temperature, but the second, hot soil is not disturbed, so it takes a long time to stay 曰' to completely desorb soil contaminants purpose. 3. Spiral thermal desorption furnace: The spiral thermal desorption furnace is mainly composed of a single shaft of the rotating shaft, which is mixed with the spiral blades on the rotating shaft and heats the contaminated soil to be broken~ until the water volatilizes and the pollutants are desorbed into the person washing (four) body. A heat transfer liquid is introduced into the rotating shaft as a heat source for heating the soil, and the heat transfer liquid is sent back to the heating system for recycling, and the temperature can reach 26Qt. The high temperature steam can also be used as a heat source for heating the soil in the rotating shaft, and the temperature can be 胄nrc. The spiral thermal desorption furnace is an indirect heating furnace, and the thermal efficiency is low and the maximum desorption temperature is also greatly limited. However, since the desorbed pollutants to be treated are not mixed with the heat source, the rear air pollution prevention and control equipment is simplified. . Therefore, the system for thermally desorbing soil contaminants provided by the present invention comprises a multi-stage spiral desorption device capable of effectively increasing the treatment rate of the contaminated soil, and a heating system capable of greatly increasing the desorption temperature, and reducing the setting of the thermal desorption Attach the required land for the system. Iv 1265052 SUMMARY OF THE INVENTION / To solve the above and other problems, and to achieve the claimed invention, the present invention provides a system for thermally desorbing soil contaminants for use in the treatment of organic or inorganic contaminants. Bandit. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a soil for the thermal desorption of soil contaminants. First, the multi-stage spiral desorption apparatus included in the system can be soiled in stages. In accordance with a preferred embodiment of the present invention, the first stage φ ^ 疋 desorption apparatus preheats and dewaters the soil, and the second stage of the spiral desorption • the apparatus performs thermal desorption of organic or inorganic contaminants. • In the case of a sandwiched spiral detachment device, the shaft is continuously stirred by the inlet and slowly advanced to the outlet at the other end. The high temperature gas generated by the heating system is introduced into the interlayer, and is used as a heat source for heating the soil together with the high temperature liquid introduced into the rotating shaft. By controlling the temperature of the gas, the above two stages can be achieved separately. Another goal of this month is to provide a system for thermally desorbing soil contaminants. The heating system included in this system can provide higher desorption temperatures, and more efficiently treat contaminated soil. According to a preferred embodiment of the present invention, the south temperature gas generated by the heating system is introduced into the interlayer of the spiral desorption device as one of the heat sources for heating the soil. The heating system can be gasification/burning of biomass. Furnace. [Embodiment] The thermal desorption device included in the present invention is a multi-stage spiral desorption device. In the preferred embodiment described later, a two-stage spiral desorption device is used as a treatment for contaminated soil of 7.265〇52 soil. Thermal desorption apparatus. 4 Referring to Figure 1, there is shown a schematic diagram of a system for thermally desorbing soil contaminants according to a preferred embodiment of the present invention. The system 100 first transports contaminated soil to the first A spiral desorption furnace 11 is preheated and dehydrated. The heat source in the first spiral desorption furnace 110 is from about 175 tons of steam passing through the inside of the rotating shaft and the spiral blade, and is connected to the inner and outer cylinder interlayers. 25 (TC's biomass) The exhaust gas is burned. The soil is fully stirred, dried and preheated to about 12 Torr in the furnace and then transferred to the second spiral desorption furnace 120. The desorbed gas is pumped to the cyclone dust collector. Ui, separating the water vapor from the dust and discharging it outside the system. The second spiral desorption furnace 120 is used as a thermal desorption equipment for treating organic or inorganic contaminants in the soil. The temperature in the second spiral desorption furnace can be maintained at 550. Between C and 600 ° C, the high temperature in the furnace is circulated by the working fluid circulating from the rotating shaft and the spiral blade at about 350 ° C and the inner and outer cylinders are about 925. The height of the crucible is provided by the high / phoenix negative The working fluid may be heat medium oil. The heat is desorbed at a high temperature, and the treated soil is discharged from the outlet end of the second spiral desorption furnace 12G. The high temperature in the furnace may cause organic or inorganic pollution in the soil. The material is completely and quickly desorbed, and the desorbed pollutants are also pumped to the cyclone 121 to separate the steam from the dust and discharged into a rear end air pollution control system (but not shown in the figure) Air pollution control system) After the stabilization, the treatment is discharged. The main heat sources of the first spiral desorption furnace 110 and the second spiral desorption furnace 12 are all from a high-efficiency biomass gasification furnace 130. The biomass gasification furnace is used. 130 produces a high temperature combustion exhaust of about 925^, first into the second 8 1265052
螺旋脫附爐12^ · 氣溫度降至約 鍋爐140中， 氣通入第一螺旋脫附、德 氣通入第-螺旋脫附爐110中的轉軸與螺旋葉片内部作為 熱源。而離_爐14G的尾氣溫度約降低為謂。c，再通 入第一螺旋脫附爐11G中内、外筒的夾層内，以便預熱且 乾餘爐内的受污染土壤，最後尾氣約纟15代的溫度下由 抽風口 112排出第一螺旋脫附爐11〇外。 此較佳實施例中的熱脫附設備與習知的一段式螺旋 脫附爐相較之下，係以兩個分離的螺旋脫附爐，加上控制 熱源的溫度，完成兩段式的熱脫附土壤污染物製程。因先 經第一段較低溫的乾燥製程，僅使水汽與部分粉塵由土壤 中分離而出，而第二段的高溫熱源則再將欲熱脫附之有機 或無機污染物由土壤中分離出來，在處理土壌的效率方面 不僅較習知為佳，後端所需之空氣污染控制系統體積亦較 為小巧。另外，兩個分離的螺旋脫附爐亦可垂直重疊設 置’如此也可減少螺旋脫附設備所需之用地。 參照第2圖，其繪示依照本發明一較佳實施例的一種 熱脫附土壌污染物之系統200之示意圖。此系統細首先 將文巧染土壤經由前置處理製程210，去除土壌中較大的 金屬塊與石塊，再輸送至第三螺旋脫附爐220進行預熱及 脫錢理。此第三螺旋脫附爐22G中的熱源係來自轉轴與 累方疋葉片内部所通入約i 75。〇的蒸汽，與内、外筒夾層所 、、，、、 〇c的生質能燃燒尾氣。土壞在爐内被轉轴與葉 9 1265052 片充分的攪拌、乾燥並預熱至約12〇°c後再輸送至第四螺 旋脫附爐230内。而脫附出的氣體則抽送至旋風集塵器 221 ’將水汽與粉塵分離後排出系統外。 第四螺旋脫附爐230係作為處理土壤中有機或無機污 染物之熱脫附設備。第四螺旋脫附爐23〇内之溫度可維持 在550°C到600°C之間，爐内高溫由轉軸與螺旋葉片内循 環約350 C的工作液體與内、外筒夾層通入約925 °C的高 溫生質能燃燒排氣所提供。此工作液體係由加熱器231保 持溫度並循環輸送至轉軸與螺旋葉片内部，以提供穩定的 間接加熱熱源。此工作流體可為熱媒油。 以咼溫進行熱脫附污染物，處理完畢的土壤則由第四 螺方疋脫附爐23 0之出口端排出。爐中的高溫可以將土壤内 的有機或無機污染物快速地脫附而出，脫附出的污染物同 樣抽送至旋風集塵器232將蒸汽與粉塵分離後排入一後端 的空氣污染控制系統（但第2圖中並未纷示此空氣污染控 制系統），進行適當的安定後處理後排出。 上述之第三螺旋脫附爐220與第四螺旋脫附爐23〇之 主要熱源均來自一高效率之生質能氣化爐24〇。由生質能 氣化爐240產生約925°C的的高溫燃燒尾氣，先通入第四 螺旋脫附爐230中内、外筒的夾層内，將熱傳給土壤後尾 氣溫度降至約650°C，接著離開第四螺旋脫附爐23〇進入 鍋爐250中，以加熱第三螺旋脫附爐22〇所需的蒸氣，蒸 氣通入第三螺旋脫附爐220中的轉軸與螺旋葉片内部作為 熱源。而離開鍋爐250的尾氣溫度約降低為25〇tt，再通 1265052 入=二螺旋脫附爐22〇中内、外筒的夹層β，以便預熱及 乾燥爐内的受污染土壤，最後尾氣約I 15代的溫度下由 抽風口 222排出第三螺旋脫附爐22〇外。 ^上述第四螺旋脫附爐230、旋風集塵器221與旋風 集塵器232處理完畢並排出之土壌與粉塵，將集中至儲存 倉260’累積至—定數量後，運送至受污染土壤之來源地 回填，以完成土壤整治復育之目標。 藉由上述之結構組成及實施例，本發明與習用相較呈 有下列優點： α 1·本發明中的多段式螺旋脫附爐，可依序分離土壤中 錢與高溫才脫_污染物氣體，因而含污染物氣體的排 氣量得以降低’較有利後段线污染防治設備高效率的運 作。 2·本發明中的生質能氣化爐，可以大幅提高熱脫附溫 度，亦可加速熱脫附速率，土壤處理量得以加大。 3·熱螺旋脫附爐因有抽風口持續往爐外抽送，故内、 外筒間之夾層與爐外相較為輕微負壓，故能避免吸入空 氣’防止脫附爐***等工安問題的發生。 4.本發明的熱源為可再生的生質能，因此並無釋放溫 室效應氣體與造成空氣污染的疑慮。 雖然本發明已以一較佳實施例揭露如上，然其並非用 以限定本發明，任何熟習此技藝者，在不脫離本發明之精 神和範圍内，當可作各種之更動與潤飾，因此本發明之保 護範圍當視後附之申請專利範圍所界定者為準。 11 1265052 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 能更明顯易懂，所附圖式之詳細說明如下： 第1圖係繪示依照本發明一較佳實施例的一種熱脫附 土壤污染物之系統之示意圖（一）。 第2圖係繪示依照本發明一較佳實施例的一種熱脫附 土壤污染物之系統之示意圖（二）。 【主要元件符號說明】 1 〇 〇 :系統 111 :旋風集塵器 120 :第二螺旋脫附爐 130 :生質能氣化爐 200 :系統 220 :第三螺旋脫附爐 222 :抽風口 231 :加熱器 240 :生質能氣化爐 260 :儲存倉 110 :第一螺旋脫附爐 112 :抽風口 121 :旋風集塵器 140 :鍋爐 21〇 :前置處理製程 221 :旋風集塵器 230 :第四螺旋脫附爐 232 :旋風集塵器 250 ·鋼爐 12The spiral desorption furnace 12^·the temperature of the gas is reduced to about the boiler 140, and the gas is introduced into the first spiral desorption, and the rotating shaft of the first spiral unwinding furnace 110 and the inside of the spiral vane are used as a heat source. The temperature of the exhaust gas from the 14G furnace is reduced to about the same. c, and then into the interlayer of the inner and outer cylinders of the first spiral desorption furnace 11G, so as to preheat and dry the contaminated soil in the furnace, and finally exhaust gas is discharged from the exhaust port 112 at a temperature of about 15 generations. The spiral desorption furnace is 11 〇 outside. The thermal desorption apparatus of this preferred embodiment is compared with a conventional one-stage spiral desorption furnace by two separate spiral desorption furnaces, plus the temperature of the control heat source, to complete the two-stage heat. Desorption of soil pollutants. Because of the first stage of the lower temperature drying process, only the water vapor and part of the dust are separated from the soil, and the second stage of the high temperature heat source separates the organic or inorganic pollutants to be thermally desorbed from the soil. In terms of the efficiency of handling soils, it is not only better than conventional, but also the air pollution control system required at the back end is relatively small. In addition, the two separate spiral desorption furnaces can also be vertically stacked. This also reduces the space required for the spiral desorption equipment. Referring to Figure 2, there is shown a schematic diagram of a system 200 for thermally desorbing soil contaminants in accordance with a preferred embodiment of the present invention. The system firstly removes the soil from the soil by the pre-treatment process 210, removes the larger metal blocks and stones in the soil, and then transports it to the third spiral desorption furnace 220 for preheating and depletion. The heat source in the third spiral desorption furnace 22G is from about i 75 from the inside of the rotating shaft and the slab. The steam of the crucible can burn the exhaust gas with the biomass of the inner and outer cylinders, ,,,, and 〇c. The soil is broken in the furnace by the shaft and the blade 9 1265052 is fully stirred, dried and preheated to about 12 ° C and then transferred to the fourth spiral desorption furnace 230. The desorbed gas is pumped to the cyclone 221' to separate the water vapor from the dust and exit the system. The fourth spiral desorption furnace 230 serves as a thermal desorption apparatus for treating organic or inorganic contaminants in the soil. The temperature in the fourth spiral desorption furnace 23 can be maintained between 550 ° C and 600 ° C. The high temperature in the furnace is circulated by the working fluid and the inner and outer cylinders of the rotating shaft and the spiral blade by about 350 C into about 925. The high temperature biomass of °C can be supplied by burning exhaust gas. This working fluid system is maintained at a temperature by the heater 231 and circulated to the inside of the rotating shaft and the spiral vane to provide a stable indirect heating heat source. This working fluid can be a heat medium oil. The heat is desorbed at a temperature of enthalpy, and the treated soil is discharged from the outlet end of the fourth screw enthalpy desorption furnace. The high temperature in the furnace can quickly desorb the organic or inorganic pollutants in the soil, and the desorbed pollutants are also pumped to the cyclone 232 to separate the steam from the dust and then discharged into a rear end air pollution control system. (However, this air pollution control system is not shown in Figure 2), and it is discharged after proper stabilization and treatment. The main heat sources of the third spiral desorption furnace 220 and the fourth spiral desorption furnace 23 are all from a high-efficiency biomass gasification furnace. The high-temperature combustion exhaust gas of about 925 ° C is generated by the biomass gasifier 240, first introduced into the interlayer of the inner and outer cylinders of the fourth spiral desorption furnace 230, and the temperature of the exhaust gas is reduced to about 650 after the heat is transferred to the soil. °C, then exiting the fourth spiral desorption furnace 23〇 into the boiler 250 to heat the steam required for the third spiral desorption furnace 22, and the steam is introduced into the rotating shaft of the third spiral desorption furnace 220 and the inside of the spiral blade As a heat source. The temperature of the exhaust gas leaving the boiler 250 is reduced to about 25 tt, and the interlayer β of the inner and outer cylinders of the 22 2 二 二 二 二 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , At about the temperature of about 15 generations, the third spiral desorption furnace 22 is discharged from the exhaust port 222. ^ The soil and dust discharged by the fourth spiral desorption furnace 230, the cyclone dust collector 221 and the cyclone dust collector 232 and discharged are concentrated until the storage bin 260' is accumulated to a predetermined quantity, and then transported to the contaminated soil. Backfilling the source to complete the goal of soil remediation. With the above structural composition and examples, the present invention has the following advantages compared with the conventional ones: α 1· The multi-stage spiral desorption furnace of the present invention can sequentially separate the money and high temperature in the soil to remove the pollutant gas. Therefore, the amount of exhaust gas containing pollutants can be reduced, which is more advantageous for the efficient operation of the back-line pollution prevention equipment. 2. The biomass gasifier of the present invention can greatly increase the thermal desorption temperature, accelerate the rate of thermal desorption, and increase the amount of soil treatment. 3. The hot spiral desorption furnace is pumped to the outside of the furnace because of the exhaust port. Therefore, the interlayer between the inner and outer cylinders is slightly under negative pressure, so it can avoid the inhalation of air to prevent the occurrence of safety problems such as explosion of the desorption furnace. . 4. The heat source of the present invention is renewable biomass energy, so there is no doubt that greenhouse gas is released and air pollution is caused. Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and it is obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; A schematic diagram of a system for thermally desorbing soil contaminants in a preferred embodiment (I). Figure 2 is a schematic view (2) of a system for thermally desorbing soil contaminants in accordance with a preferred embodiment of the present invention. [Main component symbol description] 1 〇〇: System 111: Cyclone dust collector 120: Second spiral desorption furnace 130: Biomass gasifier 200: System 220: Third spiral desorption furnace 222: Exhaust port 231: Heater 240: Biomass gasifier 260: Storage bin 110: First spiral desorption furnace 112: Exhaust port 121: Cyclone dust collector 140: Boiler 21: Pre-treatment process 221: Cyclone dust collector 230: Fourth spiral desorption furnace 232: cyclone dust collector 250 · steel furnace 12