TW517147B - Waste heat boiler - Google Patents

Abstract

The present invention relates to a waste beat boiler which is provided in a treatment apparatus for combusting and treating wastes, and recovers thermal energy from the exhaust gas. A waste heat boiler (10) comprises a housing (13), an inlet section (11) for introducing exhaust gas (j) into the housing (13), and a first heat exchange section (4) provided in the housing (13) for recovering heat by heat exchange from the exhaust gas (j) which has been introduced through the inlet section (11). A surface of the first heat exchange section (4) constitutes a flow passage (1) for allowing the exhaust gas (j) to flow therethrough, and refractory (6) is provided on the surface of the first heat exchange section (4).

Description

517147 V. Description of the invention (1) Scope of the invention] The present invention relates to a waste heat boiler for recovering thermal energy from high-temperature exhaust gas. A furnace, more specifically, is provided in a treatment device for burning and treating waste such as municipal waste Waste heat boilers for waste-derived fuel (RDF), plastic waste, waste fiber-reinforced plastic (FRP), biological waste, automobile waste, waste oil and other waste And to recover the thermal energy of the exhaust gas. 2Background of the invention] ® 'Traditionally, the waste heat boiler in the incineration plant includes a radial cooling section with embedded water pipes, and a contact cooling section with many steam generation or heating pipes across the exhaust gas stream. In the radiant cooling section, an embedded water pipe is arranged and surrounds the exhaust gas flowing in the waste heat boiler to form a flow channel of the exhaust gas so as to recover the thermal energy of the exhaust gas flowing through the embedded water pipe. On the other hand, in the contact type, many steam generating pipes or heating pipes are arranged and extended into the exhaust gas flow channel of the waste heat boiler in order to recover the thermal energy of the exhaust gas. Generally, the steam generating pipe 'or heating pipe is used to set a flow path extending into the exhaust gas, and the gas directly contacts the flowing exhaust gas, so some people think that it is installed at a place where the temperature of the exhaust gas changes to a certain temperature. The waste hot-selling furnace in the conventional incineration plant operates at a temperature of about 900 t: of exhaust gas inside the steel furnace inlet, so no problem occurs. However, in the gasification and decomposition combustion equipment, the temperature of the exhaust gas at the boiler inlet is distributed in the range of 1 100 to about 1350 ° C and higher than the temperature in the conventional incineration equipment. In the traditional waste heat boiler

313603.pti Page 6 517147 V. Description of the invention (2) If used, the metal with low melting point and salts evaporated due to high temperature will stick and ice deposit in the interior of the waste heat boiler, and fly at 900 ° C or higher temperature range. The ash is bound together, and the resulting molten salts will cause decay. As a result, the boiler tube is easily broken or damaged. Due to fly ash adhesion and sedimentation on the boiler tube, the performance of the waste heat boiler is reduced, or other failures may occur. Here, the gasification and slagging combustion equipment is defined as the waste in the system is gasified at a lower temperature to generate a combustible gas in the gasifier, and the combustible gas system generated is then burned at a higher temperature The exhaust gas is generated, and the ash contained in the combustible gas is melted to cause dissolution in a slagging combustion furnace (combustion melting furnace). [Disclosure of the Invention] The present invention is to solve the above-mentioned conventional disadvantages. Therefore, the object of the present invention is to provide a waste heat boiler, so that the rupture or damage of the boiler tube will not occur, the performance of the waste heat boiler will not be reduced by the adhesion of the boiler tube and the fly ash of the Shendian, or other failures will not occur. In order to achieve the above object of the present invention, according to one aspect of the present invention, a waste heat boiler is provided, which includes: a casing for introducing exhaust gas into an inlet section in the casing; and a first heat exchange section, which is provided. It is used in the shell to recover heat energy by heat exchange through the exhaust gas introduced through the inlet section; the surface of the first heat exchange section forms a flow channel through which the exhaust gas flows, and the refractory is used for the surface of the first heat exchange section on. According to a preferred aspect of the present invention, the main component in the refractory is silicon carbide (S i C).

517147 —Μ_—. _ __〆 ----------- 5. Description of the Invention (3). According to the present invention, the waste heat boiler 10 includes a first heat exchange section 4 and an inlet section The exhaust gas j introduced by 11 flows through the flow channel 1 on the surface of the first heat exchange section 4, and the refractory material 6 containing the main component carbonized crushed on the first heat parent conversion section 4 constituting the flow channel 1. Therefore, the corrosion of the surface of the first heat exchange section 4 does not occur, it is difficult or impossible for dust to adhere to and settle on the surface of the first heat exchange section 4, and the problem of lowering the heat transfer coefficient in the first heat exchange section 4 is not caused. will happen. According to a preferred aspect of the present invention, the flow channel includes at least two channel sections, and the first channel section of the at least two channel sections is constituted by the first heat exchange section. This arrangement is because the refractory 6 containing silicon carbide as the main component is disposed on the surface of the first heat exchange section 4 constituting the first channel section 1 & even if high temperature exhaust gas flows through the first channel section 1a, the first Corrosion on the surface of a heat exchange section 4 does not occur, and dust is difficult or non-adherent and deposited on the surface of the first heat exchange section 4. Furthermore, the problem of a decrease in the number of heat transfer coefficients in the first heat exchange section 4 does not occur. According to a preferred aspect of the present invention, the waste heat boiler further includes a second heat exchange section disposed downstream of the first heat exchange section to recover heat energy generated by the heat exchange of combustible gas or exhaust gas, and a fluid Blow to remove the soot blower that is stuck to the surface of the second heat exchange section. The second heat exchange section and the soot blower are arranged in at least two passage sections downstream of the first passage section. For a while. In this arrangement, the waste heat boiler has a sootblower SB, so that the deposits adhere to and settle on the surfaces of the second heat exchange sections 7, 26a, 26b, and 26c and can be removed by the air blow of the sootblower SB, and the first Two-stage heat exchange section 7,

313603.pti Page 8 517147 V. Description of the invention (4) The reduction of the thermal transfer coefficients of 2 6a, 2 6b, and 2 6c will be difficult to occur. According to a preferred aspect of the present invention, the waste heat boiler further includes a second heat exchange section disposed downstream of the first heat parent replacement section to recover heat energy generated by the heat exchange of the exhaust gas, and a flow containing i less three passage sections. And the second heat exchange section provided in the last channel section of the at least three-channel section is arranged in such a manner that the meandering flow is repeated at a certain interval parallel to the direction of the exhaust gas flow, and is arranged on the at least three channels The second heat exchange sections 26a, 26b, and 26c in the passage section of the last section are constructed in such a manner as to flow in a meandering manner at a specific interval parallel to the direction in which the exhaust gas j flows. Therefore, it is difficult for dust to adhere and sink to the surfaces of the second heat exchange sections 26a, 26b, and 2c, or not to adhere to and sink to the surfaces of the second heat exchange sections 26a, 26b, and 26c. And the reduction of the heat transfer coefficient in the second heat exchange sections 26a, 26b, and 26c is difficult to occur. According to another aspect of the present invention, a gasification and slagging combustion system is provided, which includes: a fluidized-bed gasification furnace for gasifying waste to produce a combustible gas furnace); a slagging combustion furnace that burns a combustible gas and melts solid components contained in the combustible gas to generate exhaust gas; and a waste heat boiler that recovers thermal energy from the exhaust gas, the waste heat boiler The method includes: a casing; an inlet section for introducing exhaust gas into the casing; and a first heat exchange section provided in the casing for performing heat exchange from the inlet section to recover heat energy; One

313603.pt3 page 9 517147 V. Description of the invention (5) > The surface of the exchange section constitutes a flow path through which the exhaust gas flows, and the refractory substance is used on the surface of the first heat exchange section. _ [Best Mode for Carrying Out the Invention] A waste heat boiler according to an embodiment of the present invention will be described below with reference to the drawings. In Figs. 1 to 7, in all the drawings, similar or identical parts are marked with similar or identical reference numerals, and repeated explanations are omitted. FIG. 1 is a schematic diagram showing a gasification and slagging combustion system including a fluidized bed gasification furnace 5, a vortex type slagging combustion furnace (combustion melting furnace) 8, and a waste heat boiler 1 0 according to an embodiment of the present invention. (Gasification, combustion and melting system 1). The waste heat boiler 10 is arranged at a later stage of the fluidized bed gasification furnace 5 and the vortex-type slag 'combustion furnace 8. Fig. 2 is a side sectional view of a waste heat steel furnace 10; Figure 3 is a front view of the waste hot selling furnace I 0. Figure 4A is a cross-sectional view taken along line XX (first channel section la (described later)) of Figure 2 and Figure 4B is along the γ-γ-line (second channel section lb of Figure 2) (Explained later) The sectional view obtained in FIG. 4C is a sectional view taken along line ZZ of FIG. 2 (third channel segment lc (described later)). In Figure 3 and Figures 4A to 4C, the steam system including the steam separator, the top cover, the steam pipe, and the like (described later) is not shown. • Next, the waste heat boiler 10 will be described with reference to Figures 2, 3, and 4A to 4C. The waste heat boiler 10 includes an inlet section II 'that introduces exhaust gas j into the boiler. Exit section 1 2 '-External wall 1 3, a first partition wall 14, a second partition wall 15, and a hopper section 16. The external wall 13, the first partition wall 14, the second partition wall 15 and the hopper section 16 collectively constituted to allow waste

313603.ptdf Page 10 517147 V. Description of Invention (6) Gas] • Flow channel 1 flowing through the waste heat boiler 10. The flow path 1 has a structure in which the exhaust gas j flows through the flow path 1 in a three-stage passage method. More specifically, the flow channel 1 has three passages parallel to each other, and the exhaust gas: {continuously flows through the three passages by changing the flow direction twice. The exterior wall 13 includes a front wall 18 shown on the right side of FIG. 2, a rear wall 19 shown on the left side of FIG. 2, and a side wall 20 shown on the right side of FIGS. 4A to 4C, shown on 4A to 4th. The side wall 17 on the left of FIG. 4C is shown on the top wall 21 on the top of FIGS. 4A to 4C. The outer wall 13 constitutes a casing in which the exhaust gas j is contained. The inlet section 11 is connected to the outlet section 5 1 of the vortex-type slagging combustion furnace 8 (detailed in Fig. 1). The exhaust gas j flows upward through the outlet section 51 and enters the inlet section 11 in a vertical direction. The flow channel 1 includes a first channel segment la, a second channel segment lb, and a third channel segment lc that are arranged in parallel with each other (detailed later). The first channel section 1 a is provided in the first channel of the flow channel 1 in the waste heat boiler 10 so that the exhaust gas j flows first, and it includes a part 17 a of the side wall 17 (shown in FIG. 4A). , Front wall 18, part 14a of the first partition wall 14 (a fragment of the first partition wall 14 on the right side of Figure 2), part of the side wall 20 0a (shown on the right side of Figure 2), and Part of the top wall 2 1 2 a (shown on the right side of Figure 2). The second channel section 1 b of the flow channel 1 is used as a lower stage channel of the first channel, and it includes a part 17 b of the side wall 17 (shown in FIG. 4B), and a part of the first partition wall 14 14 b ( A fragment of the first partition wall 14 on the left side of FIG. 2), a portion 15 of the second partition wall 15 (a fragment on the second partition wall 15 on the right side of FIG. 2), a portion 20b of the side wall 20 ( (Shown in the center of Figure 2), part of the top wall 2 1 2 1 b (shown in Figure 2

517147 V. Description of the invention (7), heart part), and a segment of the hopper segment 16 (16, 16). Jie Zuoxin 〈4〉 The second channel section 1C of the flow channel 1 really contains a part of the side wall 7 and is also a part of the last section of the channel wall 19 and the second partition wall 15 # 分 （ The lower stage channel (shown in Figure 4C), the second stage channel on the right side of the hopper section in Figure 2, the rear 1 5b (a fragment of the second partition wall 15 on the left in Figure 2), and the side wall 20 Part 2 0 C (shown on the left side in Figure 2), part 2 1 c of the top wall 21 (shown on the left side in Figure 2), and part of the hopper section 16 (located on the right side of Figure 2) Most of the exhaust gas j entering the inlet section 1 1 flows upwards through the first passage section la shown in FIG. 2 through the opening 22 formed in the upper part of the partition wall 14 and then mostly flows downwards. Pass the second channel section ib shown in Figure 2. After that, 'this exhaust gas j is formed through the hopper section located below the second partition wall 5 =: opening 23' and most of it flows upward through the third section shown in Figure 2. ft then passes through exit section 12 and flows to the left in Figure 2 (it is shown in figure 2). The air heater (not shown) is used to heat and transport the combustion air b1 (see FIG. 1) of the rolling furnace 5 (see FIG. 1) and the swirling slag combustion furnace 8 (see FIG. ^). It is appropriate to show thermal efficiency. in 彳 &## Use the # as the first heat exchange section or the radiant cooling section of the embedded water pipe 4 (see the inner side of the side wall 17 of the 5th to 18th (the exhaust gas (j) side, the same hereinafter)), front, And the two sides of the second partition wall 15. In Figures 2 and 4A to 4, the wall to which the embedded water pipe 4 is attached includes a section with two different widths.

517147 V. Wall W1 indicated by the diagonal line of the description of the invention (8) Wall W1 whose load area is indicated by the diagonal line including the dotted line W2 Wall composed of the dotted line with a small interval Wp Wall composed of the interval between the dashed lines greater than the wall wp , And consists of walls WR with a spacing greater than the dashed spacing of the wall 璧 WP. The inner drain pipe 7 used as the first heat parent changing section or the contact cooling section is arranged in the second section channel section lb. The built-in water pipe 7 recovers heat energy which is heat-exchanged from the exhaust gas j. The six embedded water pipes 7 are juxtaposed to the flow of the exhaust gas j flowing through the second passage section 丨 b 'and are parallel to the thin plate of Fig. 2. Each of the embedded water pipes 7 has an opening 5 8 for allowing the sootblower SB to be inserted into or removed from the space. Each embedded water pipe 7 has a base 29 and a top cover 30. The feed water is filled into the vapor separator 25, and then the base 28 is filled from the vapor separator 25 through the supply pipe 31 (indicated by the continuous dotted line of the rain bar in Fig. 2). A part of the feed water flows from the base 28 to the water pipe 4 a (see FIG. 5) embedded in the water pipe 4, the feed water is heated therein, and then flows into the top cover 24. A part of the residual feed water flows from the base 28 to the base 29 of the embedded water pipe 7, and then flows through the water pipe (not shown) of the embedded water pipe 7, and the feed water is heated therein. After that, the feed water flows through the top cover 30 embedded in the water pipe 7, and then flows into the top cover 24, and is combined with the above-mentioned part of the water supply. The water supply system from the embedded water pipe 4 and the embedded water pipe 7 to the top cover 2 4 is filled through the steam pipe 3 2 to the steam separator 25, and then the steam system from the steam separator 25 is filled into the steam pipe 3 3 to Steam overheated heating tube 2 6 a. The overheated and discharged steam generated by the heating pipe 26a passes through the steam camp 34 in the third channel section lc to fill the heating pipe 26b, and then the overheated steam discharged from the heating pipe 26b passes through the third channel section. 1 c outside steam tube 3 5

517147 Description of the invention (9) • After the filling degree, the heat distribution is 46, and the superheated steam flowing from the heating tube 26b flows into the ^ -hn ^, ..., and passes through the heating tube 26c. After the steam passes through the factory, a steam pipe 48 leads to the outside of the third channel passage 1C, but its steaming disorder (not shown) leads to a steam turbine (not shown). The ea, 26b, and 26c constitute The second heat exchange section of the present invention. The heating tubes 26a, 26b, and 26c of the contact cooling section include most of the tubes arranged in parallel with the exhaust gas j μ, and depending on the flow direction of the exhaust gas] · The heating pipes 26a, 26b and c are arranged in a meandering manner according to the flow direction of the waste / gas j. Dust, such as ash, is difficult to adhere to and deposit on the tables of the heating pipes 26a, 26b, and 26c. Upper part 0 of the side wall 17 7a (forming the first passage section 丨 a), the front wall 18 (see Fig. 3) and part 20a of the side wall 20 (forming the first passage Each of paragraph 1 a) has six embedded openings 36, so the total number of the embedded openings 36 is 18. For injection Gas deslagger (moving and removing device) DS (see figure 6) is inserted into each inner rear opening 36. Incidentally, the symbol DS is shown in parentheses near the embedded opening 36 in Fig. 2 Inside, and this represents the built-in opening 36, which is used to set the slag remover d S. • a part of the side wall 17 7 b (forming the second channel section 1 b), a part of the side wall 17 7, forming a part 17 c (forming The third channel segment lc), a portion 20b of the side wall 20 (forming the second channel segment 1b), and a portion 20c of the side wall 20 (forming the third channel segment ic) each have four There are three embedded openings 37, so the total number of embedded openings 37 is 16. Moreover, a part of the side wall 17 shown in the upper part of FIG. 2 7a (forming the first channel segment 1a) and shown in Figure 2 part of the side step 2 0

313603.pt ^ Page 14 517147 V. Description of the Invention (ίο) Each of the points 20a (forming the first channel segment la) has an embedded opening 37, so the total number of internal openings 37 is 2 . Incidentally, the symbol s B is shown in parentheses near the inner rear opening 37 in FIG. 2, and this represents that the built-in opening 37 is used to set the soot blower SB. Next, the slag remover (removal device) DS will be described in detail with reference to FIG. 6. The slag remover DS has a tubular slag remover body 38, and the front end portion 40 of the slag remover body 38 has a plurality of nozzles 42 in a circular shape to} 8 0. Isometric setting. The slag remover D S is horizontally enclosed in the outer frame 46, and the front end portion 40 of the slag remover d S extends into the first channel section 丨 a through the embedded opening 36 (see FIG. 2). Radon is radiated from the nozzle 42 at several angles toward the wall and hits the walls W2 and WP to remove deposits such as dust adhered to and deposited on the walls W2 and WQ. The inclination angle of the ejected steam should be determined by the area of the ejector steam that the ejector DS should eject, the vapor conditions of the ejected steam, the front end portion 40 of the ejector body 38, and the distance of the first channel segment 1 & The characteristics of the wall W2 and WP deposits were measured. The slag remover DS can emit steam while rotating around a central axis by a driving mechanism (not shown), and can move inward in the embedding direction from the embedded opening 36 in the axial direction: and from the inner opening in the extraction direction. 36 rotates outward simultaneously. The slag remover DS moves in a horizontal reciprocating manner so that the nozzle. From the position away from the wall to a position farther away from the wall. The main body 38 of the slag remover has a washing portion 44. Air is passed from the inside of the basin frame 46 to clean the inside of the outside frame 46. The clean air flows from the sections 4 to 6 through the gap 1 between the built-in opening 36 and the slag remover body 38 to prevent exhaust gas] (see FIG. 2) and flows back to the outer frame. Example-Zi Tongguang

I Page 15 313603.pti 517147

The slag remover body 3 8 is taken out from the embedded opening 36 and placed in the outer frame 46. Instead of steam, the sealed air is emitted from the nozzle 42. The sealed air seals the inside of the outer frame 46-, thereby preventing exhaust gas j. Flow back to frame 4-6. Next, the soot blower SB will be described in detail with reference to FIG. 7. The sootblower SB has a tubular sootblower body 39 (a part of the sootblower body 39 is not shown), and the front end portion 41 of the sootblower body 39 has a plurality of nozzles 43 to 180. Contour round set. The soot blower SB is horizontally wrapped in the outer frame 4 7 (partially shown in FIG. 7), and the front part 41 of the soot blower SB is inserted into the second channel section 丨! ) (See Figure 2) and the third channel segment lc (see Figure-Figure). Vapor is radiated from the nozzle 43 away from the wall wp, WQ and WR at angles of several degrees and hits the embedded water pipe 7 and the heating pipes 2 6a, 2 6b, and 2 6c to remove deposits such as adhesion And the dust deposited on the embedded water pipe 7 and the heating pipes 26a, 26b and 26c. The inclined angle of the ejected steam should be determined by the area of the soot blower SB, the steaming of the ejected steam, the gas condition, the front end portion 41 of the soot blower body 39, and the second and the third channel section 16 by the embedded opening 37 , Lc distance, the characteristics of the sediments adhered to the wall WP, WQ and WR surface and so on. • The soot blower SB can be rotated around a central axis by a driving mechanism (not shown) to emit steam at the same time, and it can be moved inward in the embedding direction from the embedded opening 37 in the axial direction and extracted. The direction is simultaneously rotated outward from the inset opening 37. The soot blower S B moves in a horizontally reciprocating manner, so that the nozzle 43 is moved from a position away from the wall WP, WQ, and WR to a position farther away from the wall WP, WQ, and WR.

313603.pti Page 16 517147 V. Description of the invention (12) The soot blower body 39 has a washing portion 45 from which air is supplied to the inside of the outer frame 47 to clean the inside of the outer frame 47. The clean air flows from the inside of the outer frame through the gap between the built-in opening 37 and the soot blower 39 to the second channel section lb and the third channel section lc to prevent exhaust gas]. (See Figure 2) Back to frame 47. In this example, the sootblower body 39 is taken out from the inset opening 37 and put into the outer frame 47. Instead of steam, the sealing air is emitted from the nozzle 43. The sealing air seals the inside of the outer frame 47, thereby preventing exhaust gas.] Flow back into the frame 47. The silicon carbide casting block 6 (see Figure 5) contains silicon carbide as the main component of refractory materials, refractory clay stele, wax stone (Roseki) refractory brick, mullite refractory material, alumina-silica refractory material Side surface, aluminum silicate refractory, etc., inside 2 i7a attached to the side wall 17 inside 2 I inside the front wall 18, part 21 & inside of the top wall 21, inside of the first partition wall 14a, and side walls The inside of the part 20a of 20, that is, the inlay = L attached to the wall constituting the first passage section la. Earthy soil and 4A to 4C towels, carbon cut and wash block 6, fire resistance = 4, wax stone refractory bricks, andalusite-rich silica refractory material, silicate-fired refractory material is equal to the exhaust gas ^ Water pipe 4 The walls are the walls W2 and WP. , ^ Cracked silicon casting block 6, refractory clay brick, pillar stone refractory material, Mongolian soil-Shixite refractory f soil ^ Flint special, Fuming red system is used to attach to the top wall (in the second figure, = , Refractory, etc. and the right side of the second top cover 2 4 The right side of the left end of the second = the part on the left side of the opening 2 2 (in the second figure, the area is located at the 17th point and the second side of the right side of the side wall 20 The member cover 2 4 the right end of the left end) above the top of the inside back 4 and on the surface of J 1 恻, that is attached

Page 17 517147 V. Description of the invention (13) The carbonized crushed and washed block 6, refractory clay, • embedded water pipe on the wall forming the second channel section 4 surface wax stone refractory brick, aluminite-rich refractory material , I earth, stone_fire substance 1 acid beacon substance, etc. can be used on the surface, on the waste gas] side, all the inner funnels 4 (see Figure 5) attached to a part 17b of the side step 17, the item wall 21 Part 21a, part 14a of the first partition wall 14, part 15a of the second partition wall 15, and part 20b of the side wall 20, that is, all the funnels attached to the wall constituting the second passage section 1b 4 surface. In addition, silicon carbide injection 6, refractory clay, waxed refractory bricks, mullite refractory, alumina-silica refractory, aluminum silicate refractory or the like may be used for attachment to the side Step 17 of part 17 of part 17 of the built-in water pipe 4 of side 17c, part 15 of part 15 of second partition wall 15 and part 20a of side wall 20, that is, attached to the surface forming third channel ^ lc Surface of the wall with embedded water pipes 4. Refractory clay bricks are made of burnt clay or paraffin (containing pyrophyllite (a120.3. 4Si〇2. H2〇) as the main component) or the like, and are really widely used refractory bricks. The wax stone refractory brick has a dense texture, and thus has excellent corrosion resistance to slag. The mullite refractory contains a high alumina refractory with a main component of 203.02si02 _, which is dense, while rapid resistance and rapid cooling. The bauxite-silica refractory is mainly composed of alumina and silica, and has high financial and thermal properties. The cracked silicon refractory is mainly composed of silicon carbide. It is a kind of ceramics and contains at least 50% silicon carbide, and preferably at least 85% silicon carbide. This silicon carbide refractory material includes shaped refractory materials such as refractory bricks or

Page 18 (14) 517147 V. Description of the invention High heat transfer performance and excellent bonding method made of unformed material The method of welding carbon-based carbonized stone to carbon-based material and replacing the embedded water pipe with silicon carbide The figure illustrates a refractory material such as a cast block. In the present invention, ^ A A ^ silicon carbide casting block is used as a solid & ^, which has properties such as the number of unformed materials and low porosity, and the cut-and-wash block has properties such as preventing slag adhesion. Excellent abrasion resistance ′ A kind of carbonization crushing pouring change β is described in detail below with reference to FIG. 5. The position anchor 27 used for the silicon casting block 6 on the surface # of the embedded water pipe 4 of γ is used for the embedded water pipe 4 by using the washing block 6, but the material is a material mainly composed of high-margin soil. ; = Block 6 may contain a 1-shaped ^ ’ceramic-to-carbide test (the second, the ceramic cap of the Bolt bolt is attached to the note block 6 is used to embed the water pipe 4.…

; The operation of the waste heat boiler will refer to the first, second, and 4A to 4C T ° combustion air bl with a low air ratio (low air ratio is defined as a ratio lower than the amount of air supplied to the complete combustion of the supplied waste The amount of air required for the combustion of the substance is set to a ratio of 丨 .0) to the bottom of the fluidized-bed gasification furnace 5, and the fluidization of silica sand formed above the diffusion plate in the fluidized-bed gasification furnace 5 bed. The waste is fed into a fluidized bed gasifier 5 and falls into a crushed sand fluidized bed maintained at a low temperature of 450 to 65 ° C. Thereby, the waste comes into contact with the heated silica sand and the combustion air bl, and is rapidly pyrolyzed and gasified, thereby making a combustible gas m, tar, and solid carbon. The combustible gas m produced in the fluidized bed gasification furnace 5 is supplied to the thirst-type melting furnace 8 and the produced gas m is combustible and contained in the produced gas m.

517147 V. Description of the invention (15) The solid component (ash, or the like) is molten. On the other hand, the solid carbon body is tired at two points: from f to the vortex-type slag combustion furnace 8 is formed due to its slower gasification rate of waste. Furthermore, the combustion air μ It can be supplied to a free board 5b on the upper part of a furnace 5 set at 85 0 ° C to vaporize tar and solid carbon at a face temperature of 65 to 85 ° C. $ Present system = 2,2 Furthermore, the plutonium / door body m discharged from the fluidized bed gasifier 5 is supplied to the vortex-type slag combustion furnace 8, and the resulting plutonium * «h 1 ^ body ^ uses the main combustion chamber 8a The burning fan in the vortex is from Tibet and quickly burns at a high temperature of 12000 to 150CTC. Dew, pot! 1 'Ashes in solid carbon are completely converted into slag due to the high temperature system. Under the action of the centrifugal force of the swirling stream, it is captured by the molten slag phase in the main combustion chamber 8a. Then, the captured slag mist flows down to the heterogeneous second, onto the inner wall and enters the second combustion chamber 8b ', and then The bottom of the solution is discharged. The unburned combustibles remaining in the gas end up. The second combustion chamber 8 (1 is fed into the third combustion chamber 8 d's combustion air bl conceal t ^ 'horse type> Chahua combustion furnace 8 exhaust gas] contains a large amount has been evaporated 丨 & " " into and then from the inlet section 1 1 to the waste heat boiler 10 0 first Passage section /., Inlet ^ section 11 The temperature of the exhaust gas j at 1 1 is between 1 1 00 to 1 40 (TC. When waste =] passes through the _ passage section 1 & exhaust gas] · heating flows through the embedded water camp 4 of the water of a ... water to recover the exhaust gas] · heat energy (see Figure $). M 313603.ptd

Page 20 517147 V. Description of the invention (16) " "-When the temperature of the waste is reduced, the fly ash with a high concentration of salts begins to precipitate. The high-concentration salt-containing fly ash system is a solid solution containing certain components, and thus the ^ phase, liquid phase, and solid phase are generated together. Therefore, the fly ash has viscous properties like a paste and a rhenium viscosity. Therefore, if the fly ash contacts the inner wall, it may stick to the inner wall and corrode the components or components to which the fly ash adheres. However, because of the silicon carbide casting block 6 (see Figure 5),

Earth ant refractory bricks, Fuming andalusite refractory, Rongtu-Shixi stone refractory, Shixi acid refractory are used for the surface of the embedded water pipe 4 in the first channel section 丨 a, the embedded water pipe The surface of 4 is difficult to corrode, so cracking or damage of the embedded water pipe 4 does not occur and dust is difficult to adhere and deposit on the surface of the internal water pipe 4. Therefore, the problem of a decrease in the heat transfer coefficient in the embedded water pipe 4 hardly occurs. The exhaust gas j that has passed through the opening 22 flows through the second passage section 1b. Similarly, the exhaust gas j heats the feed water flowing through the water pipe 4 embedded in the water pipe 4 to recover the thermal energy in the exhaust gas j (see Fig. 5). The temperature of the exhaust gas is in the range of 7000 to 10000 ° C, and it should be 700 to 900C at the opening 22 used as the inlet of the second channel section lb, so the problem of corrosion on the surface of the embedded water pipe 4 And the problem of dust adhesion and Shendian almost never occur. # Exhaust gas that has passed through the hopper section 1 6 openings 2 3 flows through the third channel section 1 c. Similarly, the “exhaust gas j heats the water pipe 4 a (see FIG. 5) flowing through the embedded water pipe 4” and is overheated and set The steam 'in the heating pipes 26a, 26b, and 26c in the flow path thus recovers the thermal energy of the exhaust gas j. The superheated steam that is overheated through the heating pipes 2 6 & 2 6 b and 2 6 c is filled to a steam turbine (not shown) ° because the temperature of the exhaust gas in the third channel section 1C is lower than that of the second passage.

313603.pt5 Page 21 517147 I > Description of the invention (17) • In the section 1 b, the problem of corrosion of the surface of the embedded water pipe 4 and the problem of dust adhesion and sinking will hardly occur. The steam is emitted from the slag remover DS, and the emitted steam hits the walls W2 and WP in the first passage section la to remove the dust deposited on the walls WP and W2. The slag remover DS adjacent to each other is set at a predetermined interval or less, and the slag remover DS can be reciprocally moved horizontally when the slag remover DS rotates, and the ejection direction of the steam is obliquely removed toward the wall at several degrees Radiation direction of the front end of the dregs DS. Therefore, the vapor can shoot through the entire area of the walls WP and ^ 2 in the first passage section la, so that the dust adhered to and deposited on the wall WP and the stomach in the first passage section la can be removed. Therefore, it is possible to avoid a decrease in the heat transfer coefficient of the inner-water pipe 4 in the first passage section 1a, and a decrease in the performance of the waste heat boiler. The steam is emitted from the soot blower SB, and the emitted steam hits the embedded water pipe 7 and the heating pipes 26a, 26b, and 26c to remove the embedded water pipe 7 and the heating pipes 2 6 a, 2 6 b, and 2 6 c. dust. Ideally, soot blowing is performed once every three hours. The soot blowers S B adjacent to each other are set at a predetermined interval or less, and the soot blowers SB can be moved horizontally in a reciprocating manner at a distance slightly shorter than the horizontal flow path when rotated. Therefore, the steam can be shot through the entire area of the embedded water pipes || and the area of the heating pipes 26a, 26b, and 26c, so that the dust adhered to and deposited on the surfaces of the embedded water pipe 7 and the heating pipes 26a, 26b, and 26c can be removed. Therefore, 'the heat transfer coefficient of the embedded water pipe 7 and the heating pipes 26a, 26b, and 26c can be prevented from being lowered' and the performance of the waste heat boiler can be prevented from being lowered. In the first passage section 1a, the dust removed by the soot blowing is dropped or introduced into the thirsty type slagging combustion furnace 8. In the second channel segment 1 b and the third channel segment 1 c

313603.pt (f page 22M / 147 V. Description of the invention (18) The dust removed by soot is dropped into the hopper ρ (not shown), and the dust and other materials are discharged to the outside, and then discharged through the discharge device ( Double damper) " ^ By means of double sealing between the inside and outside of the system, such as screw = discharge / stomach iVe, it is equipped with 1 continuous discharge of dust and other objects, and Cscrejgeder) crushes large ashes or Slag-like ashes. Pulverizer (not used in the above specific example, although gas is introduced from the vortex slag combustion furnace 8) T tungsten furnace 10 is formed by discharging the exhausted combustion gas and discharging it from the fluidized bed gasification furnace 5 Recovery of heat energy, which includes recoverable heat energy in the boiler 10. The enemy gas m can introduce waste heat as explained above. According to the present invention, the surface of the first heat exchange section constitutes one, one, one, and one heat. The exchange section, and the body or the introduced exhaust gas generates the engine k therein, so that the introduced flammable clay, ant stone refractory brick, rich "pillar: block 'refractory material, aluminum silicate refractory material or this soil Substance, bauxite-silica is resistant to the surface of a heat exchange section. Therefore, the first force is used to form the flow channel. This will not happen. This avoids the corrosion of the surface of the boiler tube. Several dusts are difficult to adhere to and Shen Dian to the first. The problem of 2. In addition, it will adhere and sink to the surface of the slave in the first heat exchange section, or the reduction of the heat transfer coefficient will not occur. On the surface, and the first heat exchange [industrial applicability ] The present invention can be applied to the Li:, waste heat boiler to recover heat lice e.g. urban waste was completed was ^:., Which system and process for combustion of waste refuse derived fuel waste testosterone (_, waste plastic waste 23517147 Page 313603.ptd

313603.pt3 Page 24 517147 Brief description of drawings [Simplified description of drawings] Figure 1 is a schematic diagram showing a fluidized bed gasification furnace, a vortex slag combustion furnace, and a waste heat boiler according to an embodiment of the present invention. Fig. 2 is a side view of a waste heat boiler according to an embodiment of the present invention; Fig. 3 is a partial front view of the waste heat boiler; Fig. 4A is a cross-sectional view taken along line XX of Fig. 2; Figure 2 is a cross-sectional view taken along line YY; Figure 4 C is a cross-sectional view taken along line Z-Z of Figure 2; Figure 5 is a cross-sectional view of an embedded water pipe with a silicon carbide casting block on the surface. Fig. 6 is a sectional view of a slag remover; and Fig. 7 is a sectional view of a soot blower. [Description of Symbols] 1 channel 1 a channel section lb second channel section lc — * channel section 4 — heat exchange section 4a water pipe 5 fluidized bed gasifier 5 a diffuser 5b freeboard 6 refractory 6 Silicon carbide casting block 7 Second heat exchange section 8 Vortex-type slag furnace 8a Main combustion chamber 8b Second combustion chamber 8 c Slag separation chamber 8d First-combustion chamber 10 Waste heat boiler 11 Into α section 12 Out Alpha Section 13 Shell 14 First — Partition Wall

313603.pti Page 25 517147 Brief description of the drawings # 1 4a, 14b 15 16 17a 18 21 11, 24 Part of the first partition wall Second part of the partition wall 15a Part of the second partition wall Hopper section 1 7, 2 0 Side wall 17b, 20a, 20b Part of the side wall, front wall 23, 58 Opening second roof—26a, 26b, 26c Y-shaped anchor_ 3 1 Supply pipe 3 6, 3 7 Built-in opening 39 Sootblower body 42, 43 nozzle bl combustion air m combustible gas Wl., W2, WP, WQ,% heat 19 21a 24 > 25 segment 28 > 32 > 38 ^ 41 4 6, rear wall, 2 1 b top wall Part of the 30-cap vapor separator WR wall

SB 2 9 base 33 > 34 > 48 DS slag remover front part 4 7 frame exhaust gas soot blower steam pipe

313603.ptcf 苐 page 26

Claims (1)

517147 6. Scope of patent application 1. A waste heat boiler, comprising: a casing for introducing exhaust gas into an inlet section of the casing; and-provided in the casing for introducing the exhaust gas through the inlet section for heat A first heat exchange section that exchanges and recovers heat energy; wherein a surface of the first heat exchange section constitutes a flow path through which the exhaust gas flows, and a refractory is used on the surface of the first heat exchange section. 2. If the waste heat boiler of item 1 of the patent application scope, the main component of the refractory includes mullite, silicon carbide or alumina-silica. 3. If the waste heat boiler of item 1 of the patent application scope, the refractory substance includes refractory clay or wax stone refractory brick. 4. For a waste heat boiler as claimed in item 1 of the patent scope, wherein the flow channel has at least two channel sections, and the first channel section of the at least two channel sections is constituted by the first heat exchange section. 5. The waste heat boiler according to item 4 of the patent application, further comprising: a second heat exchange section provided downstream of the first heat exchange section for recovering heat energy exchanged by the exhaust gas; and a fluid blow to move In addition to the soot blower (s ο 〇tb 1 〇wer) of Shen Dianwu attached to the surface of the second heat exchange section; wherein the second heat exchange section and the soot blower are arranged downstream of the first channel section, the at least One of the two passage sections. 6. The waste heat boiler according to item 1 of the scope of patent application, further comprising: a second heat exchange section provided downstream of the first heat exchange section for recovering heat energy exchanged by the exhaust gas; 313603.pti Page 27 517147 VI. Patent application scope 'where the flow channel has at least three channel sections, and the second heat exchange section is arranged in the last channel section of the at least three channel sections, which is parallel to the The direction of the flow direction of the combustion gas or the exhaust gas is constructed in a meandering flow at a specific interval. 7 * A gasification and slagging combustion system, comprising: " Fluidized bed gasification furnace for gasifying waste to generate combustible gas; burning the combustible gas and solidifying the solid contained in the combustible gas A slagging combustion furnace that generates exhaust gas by melting components; and a waste heat boiler that recovers heat energy from the exhaust gas, the waste heat boiler including: a casing; an inlet section for introducing the exhaust gas into the casing; A first heat exchange section that introduces the exhaust gas from the inlet section and recovers heat energy by heat exchange; wherein the surface of the first heat exchange section constitutes a flow channel through which the exhaust gas flows, and a refractory is used for the first heat On the surface of the exchange segment. 8. If the gasification and slagging combustion system of item 7 of the patent application scope, wherein the refractory material contains silicon carbide as the main component. 9. The gasification and slagging combustion system according to item 7 of the application, wherein the flow channel has at least two channel sections, and the first channel section of the at least two channel sections is constituted by the first heat exchange section. . 1 〇.If the gasification and slagging combustion system of item 9 of the scope of patent application, including: 313603.pti page 28 517147 6. The scope of the patent application is set at the second heat exchange section downstream of the first heat exchange section for recovering heat energy from the exhaust heat; and the fluid is blown to remove adhesion to the second heat exchange section. Soot blower for deposits on the surface of the second heat exchange section; wherein the second heat exchange section and the soot blower are arranged in one of the at least two passage sections downstream of the first passage section. 1 1. The gasification and slagging combustion system according to item 7 of the patent application scope, further comprising: a second heat exchange section provided downstream of the first heat exchange section for recovering heat energy exchanged by the exhaust gas; wherein the The flow channel has at least three passage sections, and the second heat exchange section is disposed in the last passage section of the at least three passage sections, which repeatedly winds at a specific distance in a direction parallel to the direction in which the combustible gas or the exhaust gas flows. Constructed in a serpentine way. 313603.ptd, page 29