CN116006980A - Rolling grate and garbage incineration boiler - Google Patents

Abstract

The invention relates to the technical field of environmental protection heat energy, and provides a rolling grate and a garbage incineration boiler. The rolling grate is used for bearing combustion fuel and pushing combustion products, and comprises a transmission mechanism and a driving mechanism; the transmission mechanism comprises a plurality of rollers which are arranged above the water tank side by side, and the rollers are arranged at intervals to form a gap for allowing air flow to pass through; the driving mechanism is used for driving the roller to rotate unidirectionally around the axial direction of the roller to form a conveying surface for unidirectionally conveying driving fuel. When the rolling fire grate works, the household garbage to be combusted is positioned on the conveying surface formed by the rollers, so that the household garbage can be combusted and moved along with the conveying surface, and the rollers are also in a rotating state, so that the household garbage can be prevented from being adhered to each other. Because gaps are reserved between the adjacent rollers, air can circulate from the gaps between the rollers, and the combustion effect of household garbage is ensured.

Description

Rolling grate and garbage incineration boiler

Technical Field

The invention relates to the technical field of environmental protection heat energy, in particular to a rolling grate and a garbage incineration boiler.

Background

Urban domestic garbage is generally treated by landfill and boiler incineration. This approach has been gradually eliminated due to land occupation and environmental pollution by landfills. The current mainstream mode is to put domestic garbage into a boiler, and burn the domestic garbage by the boiler to supply heat or generate electricity.

The movable chain type boiler used in the conventional small boiler is relatively stationary with respect to the fire grate when in operation. When the movable chain type boiler is used for incinerating garbage, the garbage is easy to adhere to the fire grate, ventilation is easy to be unsmooth, garbage combustion is not facilitated, and other fuels are sometimes required to be added for mixed combustion supporting. Therefore, in the incineration treatment of the living garbage, the main stream is incineration using a grate boiler, a fluidized bed boiler, a rotary kiln boiler, or the like, but these boilers are huge in size. The reciprocating grate boiler is generally adopted when the grate boiler burns garbage, and the reciprocating grate boiler can ensure the relative motion between fuel and the grate, prevent the problems of adhesion of garbage, unsmooth ventilation and the like, but needs slope arrangement, and has larger size compared with the grate of other boilers.

In summary, the conventional household garbage incineration boiler has the problems of huge volume or easy adhesion of garbage and unsmooth ventilation during combustion, and the boiler with small volume, difficult adhesion of garbage and good combustion effect needs to be provided.

Disclosure of Invention

In order to overcome the defects in the prior art, the application provides a rolling grate and a garbage incineration boiler.

The rolling grate is used for bearing combustion fuel and pushing combustion products and comprises a transmission mechanism and a driving mechanism;

the transmission mechanism comprises a plurality of rollers which are arranged above the water tank side by side, and the rollers are arranged at intervals to form a gap for allowing air flow to pass through;

the driving mechanism is used for driving the roller to rotate unidirectionally around the axial direction of the roller to form a conveying surface for unidirectionally conveying driving fuel.

In one possible implementation manner, a cooling channel penetrating through the roller is arranged along the axial direction of the roller, a small water outlet pipe is inserted into the cooling channel, and an annular gap exists between the small water outlet pipe and the cooling channel, so that the motion state of the small water outlet pipe and the motion state of the roller are independent.

The application also provides a garbage incineration boiler, which comprises the rolling grate, a water tank, a hearth and a boiler body;

the hearth comprises a fuel inlet and an ash outlet, the rolling grate is arranged at the bottom of the hearth along the direction of the fuel inlet pointing to the ash outlet, and the rolling grate is communicated with the water tank.

In one possible implementation mode, an air chamber which penetrates up and down is formed between the water tank and the rolling grate, and the rolling grate and the water tank are respectively positioned at an upper through hole and a lower through hole of the air chamber; the water tank contains accumulated water, and the accumulated water can seal the through hole below the air chamber.

In one possible embodiment, the air chamber is provided with a vent hole for inputting air into the air chamber, and one side of the water tank is provided with an overflow port, and the height of the overflow port is lower than that of the vent hole.

In one possible embodiment, the garbage incineration boiler comprises a fan assembly and a wind chamber;

the fan assembly is used for ventilating the air chamber;

a plurality of partition boards are arranged in the air chamber, the partition boards divide the air chamber to form a plurality of relatively independent air compartments, and the air compartments are respectively communicated with all positions on the rolling fire grate; and air doors for controlling and inputting the air quantity corresponding to the air separation bin are arranged on any air separation bin.

In one possible implementation mode, two opposite sides in the water tank are respectively provided with a flushing pipe and a drain outlet, the drain outlet is positioned at the lowest part of the water tank, a water tank drain valve is arranged in the drain outlet, and the water outlet direction of the flushing pipe points to the drain outlet.

In one possible embodiment, the boiler body comprises an upper header, a lower header and a tube bundle at both sides, the tube bundle comprising a plurality of heated water tubes, the upper header and the lower header being in communication through the tube bundle; and blocking pieces for blocking the flow of the flue gas are connected to the tube bundles.

In one possible implementation mode, a smoke flow path is formed between the rolling grate and the smoke outlet, a smoke pipe is arranged at one section of the smoke flow path, and an ash bin with an upward opening is arranged below the smoke flow path and corresponds to the position of the smoke pipe.

In one possible implementation manner, a flue gas flow path is formed between the rolling grate and the flue gas outlet, and a waste heat water tank is arranged on the flue gas flow path and is respectively communicated with a water supply tank and the boiler body and used for supplying water after flue gas preheating for the boiler body.

Compared with the prior art, the beneficial effect of this application: the present application provides a rolling grate, wherein the grate comprises: a transmission mechanism and a driving mechanism; the transmission mechanism comprises a plurality of rollers which are arranged above the water tank side by side, and the rollers are arranged at intervals to form a gap for allowing air flow to pass through; the driving mechanism is used for driving the roller to rotate unidirectionally around the axial direction of the roller to form a conveying surface for unidirectionally conveying driving fuel. When the rolling fire grate works, the household garbage to be combusted is positioned on the conveying surface formed by the rollers, so that the household garbage can be combusted and moved along with the conveying surface, and the rollers are also in a rotating state, so that the household garbage can be prevented from being adhered to each other. Because gaps are reserved between the adjacent rollers, air can circulate from the gaps between the rollers, and the combustion effect of household garbage is ensured. A portion of the smaller size combustion ash falls from the gap between the rollers into the flume. In addition, the rolling fire grate has compact structure and no need of inclined arrangement, so that the occupied area is small. The application also provides a garbage incineration boiler, which comprises a water tank, a hearth and a boiler body, and further comprises the rolling grate, so that all the technical effects of the rolling grate are achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a side view of a rolling grate;

FIG. 2 shows a front view of a rolling grate;

FIG. 3 shows a top view of a rolling grate;

fig. 4 shows a side view of a waste incineration boiler;

fig. 5 shows a front view of a waste incineration boiler;

fig. 6 shows a top view of the waste incineration boiler.

Description of main reference numerals:

1. a base; 101. an overflow port; 102. a sink drain valve; 103. a water tank; 104. a wind separation bin; 105. a partition plate; 106. a front bellows; 107. a blower; 108. a flushing pipe; 109. an inner air duct; 110. an outer air duct; 111. a vent hole; 112. an air chamber; 2. a rolling grate; 201. a roller; 202. a bearing; 203. a water receiving tray; 204. a cooling valve; 205. a sprocket; 206. a chain; 207. a water diversion pipe; 208. a small water outlet pipe; 209. a fire grate speed reducing motor; 3. a boiler body; 301. a water level controller; 302. a lower header connecting pipe; 303. a body blow-down valve; 304. a lower header; 305. a tube bundle; 306. a blocking member; 307. a header is arranged; 308. a steam drum; 309. a steam-water separator; 310. a steam outlet; 4. a waste heat water tank; 401. a waste heat water tank drain valve; 402. a waste heat water tank connecting pipe; 403. a smoke tube; 404. a waste heat water tank water inlet; 405. exhaust port of waste heat water tank; 406. exhaust pipe of waste heat water tank; 407. a water outlet of the waste heat water tank; 5. a furnace wall; 501. a smoke box; 502. a furnace; 503. a furnace door; 504. an ash bin; 505. an ash removal door; 506. a fuel inlet; 507. an ash outlet; 6. a water supply tank; 601. a water tank body; 602. a float valve; 7. a water feed pump; 8. a feeding device; 801. a feed hopper; 802. boiler feeding motor.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the mechanical connection can be realized, and the electric welding connection can be realized; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Example 1

The present embodiment provides a rolling grate for carrying combustion fuel and pushing combustion products. Referring to fig. 1-3, the rolling grate 2 includes a transmission mechanism and a driving mechanism; the transmission mechanism comprises a plurality of rollers 201 which are arranged side by side; the driving mechanism comprises bearings 202 inserted on two sides of the roller 201, a chain wheel 205 inserted on one side or two sides of the roller 201, a chain 206 and a fire grate speed reducing motor 209.

Fig. 1 shows a side view of a rolling grate, with the direction of the arrow being the rolling direction of the rollers 201. It can be seen that the roller grate 2 is positioned above the water trough 103 and comprises a plurality of rollers 201 arranged side by side and parallel at intervals, adjacent to said rollers 201 being spaced apart to form a gap for allowing the passage of air. A plurality of the rollers 201 rotate unidirectionally around the axial direction thereof to form a conveying surface for driving the unidirectional transmission of fuel.

Fig. 2 shows a front view of a rolling grate. It can be seen that the bearings 202 are inserted on both sides of each roller 201, and the bearings 202 at both ends of the roller 201 are integrally fixed on the opposite sides of the base 1 through shaft shoulders and snap springs (the shaft shoulders and the snap springs are not shown). During maintenance, the shaft shoulder and the clamp spring connected with the single roller 201 can be detached for independent maintenance.

Fig. 3 shows a top view of a rolling grate. It can be seen that at least one sprocket 205 is provided on the rotor of the grate reduction motor 209 and on any of the rollers 201. The chain wheel 205 sleeved on the rotor of the fire grate reducing motor 209 is meshed with the chain 206 at the periphery and is in transmission connection with the chain wheel 205 sleeved on the roller 201 through the chain 206. The main parameters of the rollers 201, the chain wheels 205 and the chains 206 are consistent, so that the rollers 201 keep the same rotation speed under the drive of the fire grate speed reducing motor 209.

The sprocket 205 is mounted at both ends of the 1 st roller 201 closest to the fire grate reduction motor 209, the sprocket 205 is mounted at only one end of the 3 rd, 5 th, 7 th, … … th, N (N is an odd number) odd number rollers 201 closest to the fire grate reduction motor 209 opposite to the fire grate reduction motor 209, and the sprockets 205 of adjacent odd number rollers 201 are in driving connection through the chain 206. The rotor of the fire grate speed reducing motor 209 transmits power to the 1 st roller 201 through a chain wheel 205 and a chain 206 sleeved above the rotor, the 1 st roller 201 rotates to drive the chain wheel 205 at the opposite end of the fire grate speed reducing motor 209 to rotate, the chain wheel 205 rotates to drive the 3 rd roller 201 through the chain 206, the 3 rd roller 201 drives the 5 th roller 201 at one side opposite to the fire grate speed reducing motor 209, the 5 th roller 201 drives the 7 th roller 201, and the like until all odd rollers 201 are driven to rotate unidirectionally.

The 2 nd, 4 th, 6 th, … … th, and M (M is even) even number rollers 201 near the fire grate reducing motor 209 are only provided with chain wheels 205 at one end on the same side as the fire grate reducing motor 209, and the chain wheels 205 of adjacent even number rollers 201 are in transmission connection through a chain 206. Similar to the transmission mode between the odd rollers 201, the rotor of the fire grate speed reducing motor 209 drives the 2 nd roller 201 to rotate through the chain wheel 205 and the chain 206, the 2 nd roller 201 drives the 4 th roller 201 to rotate through the chain wheel 205 and the chain 206 on the same side of the fire grate speed reducing motor 209, the 4 th roller 201 drives the 6 th roller 201, and the like until all even rollers 201 are driven to rotate unidirectionally.

With the above arrangement, the sprockets 205 on the same side of the roller 201 are spaced apart from each other (except for the sprocket 205 on the same side of the 1 st roller 201 and the 2 nd roller 201, but the sprockets 205 on the same side of the 1 st roller 201 and the 2 nd roller 201 are offset from each other in the longitudinal direction of the roller 201). It should be noted that, if the sprockets 205 have a certain volume, and if all the sprockets 205 are disposed on the same side of the rollers 201, in order to avoid collision between the sprockets 205, the gaps between adjacent rollers 201 need to be enlarged, and the oversized gaps between the adjacent rollers 201 will cause the household garbage on the conveying surface to fall from the gaps. However, in this apparatus, only a ventilation slit needs to be formed between the adjacent rollers 201. Thus, by the above arrangement, the plurality of rollers 201 can be arranged more closely, and the amount of falling combustion ashes from the gap can be reduced.

In some embodiments, the outer surface of roller 201 is a smooth cylindrical surface. In other embodiments. The outer surface of the roller 201 is provided with groove marks along the axis of the roller 201 to increase the friction between the roller 201 and the household garbage, so that the household garbage can move smoothly along the conveying surface.

When the rolling grate 2 works, the household garbage to be burned is on the conveying surface formed by the rollers 201, so that the household garbage can be burned and moved along with the conveying surface, and the rollers 201 are also in a rotating state, so that the household garbage can be prevented from being adhered to each other. Since gaps are left between the adjacent rollers 201, air can circulate from the gaps between the rollers 201, and the combustion effect of the household garbage is ensured. A portion of the smaller size combustion ash falls from the gap between the rollers 201 into the water tank 103.

In some preferred embodiments, the roller grate 2 is used to carry granular household waste for combustion and to push ash generated after combustion.

Referring to fig. 2 and 3, the arrow direction in fig. 2 and 3 indicates the water flow direction. In some embodiments, a circular through hole penetrating through the center of the roller 201 is arranged along the axial direction of the roller 201, a small water outlet pipe 208 for cooling the roller 201 is inserted into the through hole, a plurality of small water outlet pipes 208 are communicated with the same water distribution pipe 207, and a cooling valve 204 is arranged on the water distribution pipe 207. The inner diameter of the through hole in the roller 201 is slightly larger than the outer diameter of the small water outlet pipe 208, so that an annular gap exists between the small water outlet pipe 208 and the through hole, and therefore the small water outlet pipe 208 in the roller 201 cannot be driven to rotate together when the roller 201 rotates, and the motion state of the small water outlet pipe 208 and the motion state of the roller 201 are mutually independent.

In the existing reciprocating grate, the fire grate pieces can continuously rake and burn hot fuel (when the reciprocating grate is applied to household garbage incineration, the fuel refers to household garbage), the fire grate pieces are easy to burn out due to high temperature of the fuel, and the fire grate pieces are difficult to find and replace after being burnt out or falling off, so that the fuel falls from a notch formed by the falling of the fire grate pieces, and devices below the fire grate can be burnt out, so that safety accidents are caused. In this application, by injecting water into the water diversion pipe 207, the water flows along the water outlet small pipe 208 and passes through the through hole in the middle of the roller 201, so as to cool the roller 201, and avoid the roller 201 from being damaged by high temperature, thus prolonging the service life of the roller 201 and reducing the safety risk of the rolling grate 2.

A water receiving disc 203 is also arranged below the openings on two sides of the through hole of the roller 201, the surface of the water receiving disc 203 is an inclined surface, and the lowest part of the inclined surface faces the water tank 103. After the water leaked from the roller 201 falls onto the water receiving tray 203, the water drops fall into the water tank 103 along the surface of the water receiving tray 203.

Example two

The present embodiment provides a refuse incineration boiler for incinerating refuse and evaporating water into steam using heat energy generated by the incineration. The waste incineration boiler comprises the rolling grate 2 according to the first embodiment, and thus has all the advantages of the rolling grate 2.

Referring to fig. 4 to 6, fig. 4 shows a side view of the garbage incineration boiler, fig. 5 shows a front view of the garbage incineration boiler, and fig. 6 shows a top view of the garbage incineration boiler. In the figure, the garbage incineration boiler mainly comprises a base 1, a boiler body 3, a waste heat water tank 4, a boiler wall 5, a water supply tank 6, a water supply pump 7 and a feeding device 8.

Wherein the base 1 comprises a water trough 103. The boiler body 3 is surrounded by the furnace wall 5 and is located above the water tank 103. Furnace walls 5 enclose a furnace 502.

The furnace 502 comprises a fuel inlet 506 and an ash outlet 507, and the rolling grate 2 is arranged at the bottom of the furnace 502 along the direction that the fuel inlet 506 points to the ash outlet 507. The rolling grate 2 communicates with the water tank 103 so that a portion of the smaller size combustion ashes, which leak from the gap between the rollers 201, fall into the water tank 103 and settle to the bottom of the water tank. In addition, since the ash discharge direction of the ash discharge port 507 is directed to the water tank 103, ash generated after incineration of the household garbage is also dumped into the water tank 103 by the transportation of the rolling grate 2.

(1) Base seat

Referring to fig. 4 and 5, the base 1 includes an air chamber 112 and a fan assembly in addition to the water tank 103. The air chamber 112 is formed between the water tank 103 and the rolling grate 2, and the air chamber 112 is vertically penetrated, and the rolling grate 2 and the water tank 103 are respectively positioned at the upper and lower through holes of the air chamber 112. The accumulated water contained in the water tank 103 can seal the bottom of the air chamber 112, so that the air in the air chamber 112 is basically conveyed to the rolling grate 2 through the through hole above, and the garbage above the rolling grate 2 is combured. The fan assembly is then used to input wind into the plenum 112.

Referring to fig. 4, in some embodiments, a flushing pipe 108 and a drain (not shown) are respectively disposed at two opposite sides of the water tank 103; the drain outlet is positioned at the lowest part of the water tank 103, a water tank drain valve 102 is arranged in the drain outlet, and the water outlet direction of the flushing pipe 108 is directed to the drain outlet. Specifically, a flushing pipe 108 is installed at the bottom of the side of the water tank 103 close to the fuel inlet 506, and one end of the water inlet of the flushing pipe 108 is communicated with the sewage outlet of the boiler body 3, so that the bottom of the water tank 103 can be flushed by sewage in the boiler body 3.

During the combustion of household refuse, some of the smaller size combustion ashes may fall from the gap between the rollers 201 into the water tank 103, and furthermore, the ashes after the refuse is sufficiently burned may also fall from the ash outlet 507 into the water tank 103. These ashes are deposited in the water tank 103 and are mostly deposited at the bottom of the water tank 103. When the flushing pipe 108 is opened, the pressure of the flushing water flushes the ash to the vicinity of the sewage outlet, and then the water tank sewage valve 102 is opened, so that the ash can be discharged.

Referring to fig. 4-5, the blower assembly includes a front blower 106 and a blower 107. The front bellows 106 has one end communicating with the air outlet of the blower 107 and the other end communicating with the outer air duct 110. An inner air duct 109 and an outer air duct 110 are sequentially arranged from inside to outside on both sides of the air chamber 112, and ventilation holes 111 for communicating the outer air duct 110 and the air chamber 112 are respectively arranged on both sides of the inner air duct 109 (the size of the ventilation holes 111 can be adjusted according to the required ventilation amount). The air blown by the blower 107 is sequentially introduced into the air chamber 112 through the outer air passage 110 and the inner air passage 109.

A plurality of partition boards 105 are arranged in the air chamber 112 at intervals in parallel, and the air chamber 112 is divided by the partition boards 105 to form a plurality of relatively independent air compartments 104. Referring to fig. 4, the upper end of the partition 105 is close to the bottom surface of the rolling grate 2, and the lower end of the partition 105 is spaced from the bottom plate of the base 1, so that the bottoms of the wind compartments 104 are communicated. A plurality of wind compartments 104 are respectively communicated with each section of the rolling grate 2 to provide air for the garbage burned on each section of the rolling grate 2. As can be seen in fig. 4, each wind compartment 104 communicates with the inner air duct 109 through the ventilation holes 111 except for the wind compartment 104 closest to the ash hole 507. The air vent 111 is not arranged on the air compartment 104 closest to the ash outlet 507, firstly, the garbage on the section of the rolling grate 2 close to the ash outlet 507 is basically burnt out, and more air is not needed for supporting combustion; and secondly, ash residues generated after the combustion of the introduced wind are avoided.

In some embodiments, a damper (not shown) for controlling the air volume input to the corresponding wind compartment 104 is provided on any wind compartment 104. Specifically, the damper is disposed on the vent 111 of the air compartment 104 that communicates with the inner plenum 112.

The amount of air required for combustion of the waste on each section of the traveling grate 2 is not the same. Generally, the section of the traveling grate 2 near the fuel inlet 506 is burned more strongly because the most garbage is deposited and is not burned sufficiently. In the section of the rolling grate 2 near the ash outlet 507, the heat value of the garbage on the section is fully released, and the combustible garbage on the section is relatively less, so that the air required for combustion is less. By controlling the opening of the air doors on the different air compartments 104, the air quantity input by the target air compartment 104 to a certain section of the rolling grate 2 can be regulated, so that the air quantity blown out by the fan assembly can be reasonably distributed, and the garbage on each section of the rolling grate 2 can be fully combusted by air.

An overflow port 101 is also arranged on one side of the water tank 103, and the height of the overflow port 101 is higher than the height of the lower end surface of the partition plate 105 but lower than the height of the ventilation hole 111. Thus, when the device is in operation, the water level of the water tank 103 is maintained near the overflow 101 to seal the bottom of the plenum 112. And because of the overflow port 101, the air chamber 112 is prevented from being too small in space due to the too high water level in the water tank 103, and ventilation is prevented from being influenced.

(2) Boiler body

The boiler body 3 is a main body part for evaporating water into steam by utilizing heat energy in the garbage incineration boiler, and the boiler body 3 is arranged on the upper part of the base 1 and is a certain distance away from the rolling grate 2. Referring to fig. 5, the solid arrow direction in fig. 5 is the flow direction of the flue gas, and the open arrow direction is the water flow direction.

The boiler body 3 includes two lower header tanks 304 on the left and right sides relative to the lower side of the boiler and two upper header tanks 307 on the left and right sides relative to the upper side of the boiler. The lower header 304 is communicated with the upper header 307 through a tube bundle 305 composed of a plurality of heated water tubes.

The two groups of tube bundles 305 are arranged symmetrically and side by side, and each group of tube bundles 305 is welded with flat steel forming a blocking member 306 on a heated water tube near the center of the tube bundle 305 and a heated water tube near the outside of the tube bundle 305 (the outside of the tube bundle 305 refers to the edge sides of the two groups of tube bundles 305 arranged side by side). The lower ends of the flat steels in the center of the tube bundle 305 are in contact with the lower header 304 and the upper ends are spaced from the upper header 307 to form an upper opening. The upper ends of the flat steels outside the tube bundle 305 are in contact with the upper header 307 and the lower ends are kept at a distance from the lower header 304 to form a lower opening. The upper opening is opposite to the lower opening. As shown by the solid arrow in fig. 5, the flue gas formed by combustion in the furnace 502 flows out from the upper openings of the flat steels on the left and right sides, turns towards the outer side of the furnace 502, and flows out of the lower openings of the flat steels, so that an S-shaped flue gas flow path is formed, and the flow stroke of the flue gas is prolonged. Because the flue gas formed by combustion has higher temperature, the heat energy of the flue gas can be used for heating water in the heated water pipe to a greater extent by prolonging the travel of the flue gas in the boiler body 3, and the heat energy of the flue gas is fully utilized.

The lower header 304 on the left and right sides are communicated with each other through the lower header connecting pipe 302. The lower header 304 at one side is also communicated with the flushing pipe, and a body blow-down valve 303 is arranged at the communication position of the flushing pipe of the lower header 304. With the above arrangement, the sewage discharged from the lower tank 304 is supplied to the flushing pipe 108 for flushing the bottom of the water tank 103.

The upper ends of the upper header 307 on the left and right sides are connected with a steam drum 308, a steam-water separator 309 is arranged in the steam drum 308, heated water in the upper header 307 forms water vapor, the water vapor is input into the steam drum 308, and the water vapor is separated by the steam-water separator 309 to form dry steam and flows out from a steam outlet 310 of the steam drum 308.

In some embodiments, a water level controller 301 is connected to both the upper header 307 and the lower header 304 to control the water level in the upper header 307 and the lower header 304.

(3) Waste heat water tank

Referring to fig. 5, the waste heat water tank 4 is a square tank body with a closed periphery, and is made of a heat conducting material (such as stainless steel). A plurality of small smoke pipes 403 are arranged in the waste heat water tank 4, and the smoke pipes 403 are positioned on a smoke flow path. An upward opening ash bin 504 is provided below the flue gas flow path at a position corresponding to the flue pipe 403. When the flue gas flows to the position of the flue pipe 403, the flue pipe 403 is relatively narrow, so that ash residues carried in the flue gas can be blocked to a certain extent, and the ash residues in the flue gas drop into the ash bin 504, so that the particle amount in the flue gas is reduced. An openable ash removal door 505 is also provided on the rear side of the ash bin 504.

The left and right sides of the boiler body 3 are provided with waste heat water tanks 4, and the waste heat water tanks 4 positioned at the left and right sides of the boiler body 3 are communicated through waste heat water tank connecting pipes 402. A waste water inlet is formed in the waste water tank 4 near one side of the water supply tank 6, and the waste water tank inlet 404 is communicated with the water supply tank 6. The other waste heat water tank 4 is provided with a waste heat water tank water outlet 407, and is communicated with the water inlet of the water supply pump 7 through the waste heat water tank water outlet 407.

As shown by the open arrow in fig. 5, water in the water supply tank 6 is injected into one waste water tank 4 through the waste water tank water inlet 404, and is input into the other waste water tank 4 through the waste water tank connection pipe 402, and water preheated by the waste water tank 4 is input into the feed pump 7 through the waste water tank water outlet 407.

The waste heat water tank 4 preheats water input into the waste heat water tank 4 through heat energy of flue gas in the boiler body 3, and the preheated water is input into the lower header 304 through the water feed pump 7 to serve as water for heating the boiler body 3 to form water vapor. The preheated water has a certain amount of heat, so that the speed of generating steam by heating the water by the boiler body 3 is higher.

In some embodiments, a waste-heat water tank drain valve 401 is mounted at the bottom of each waste-heat water tank 4 for draining the waste water in the waste-heat water tank 4.

In other embodiments, the waste water tank 4 is provided with a waste water tank vent 405 at its upper portion, and the waste water tank vent 405 is connected to the upper end of the water supply tank 6 through a waste water tank vent pipe 406. With the above arrangement, the water vapor generated in the waste heat water tank 4 is inputted into the water supply tank 6.

(4) Furnace wall

Referring to fig. 4-5, the furnace wall 5 includes a refractory layer and an insulating layer, the refractory layer is distributed on a side close to the furnace 502 to prevent the combustion products in the furnace 502 from burning the furnace wall 5, and the insulating layer is distributed on a side far from the furnace 502 to reduce heat dissipation in the furnace wall 5. Specifically, the refractory layer is made of refractory bricks or refractory concrete, and the heat-insulating layer is made of aluminum silicate materials.

Referring to fig. 5, a furnace door 503 is installed at the center of the furnace wall 5 communicating with the furnace 502, and a worker can ignite in the furnace 502 by opening the furnace door 503. The fuel inlet 506 is arranged on the furnace wall 5, and the height of the fuel inlet 506 is slightly larger than that of the rolling grate 2.

A smoke box 501 for converging smoke is arranged at the top of the furnace wall 5, the smoke box 501 is positioned at the tail end of a smoke flow path, a smoke outlet of the smoke box 501 is communicated with smoke treatment equipment (not shown in the figure), and the smoke treatment equipment is used for effectively treating toxic and harmful substances contained in the smoke to a concentration below a specified concentration.

(5) Water supply tank

Referring to fig. 5, a water supply tank 6 is installed at the outer side of the furnace wall 5, and includes a water tank body 601 and a ball cock 602 installed in the water tank body 601. The water inlet of the water supply tank 6 and the float valve 602 are both higher than the top plane of the waste heat water tank 4, and the control water level of the float valve 602 in the water supply tank 6 is slightly higher than the top plane of the waste heat water tank 4, so that the water in the water supply tank 6 can be input into the waste heat water tank 4 through the water pipe under the action of gravity. The water supply tank 6 is also in communication with the water diversion pipe 207 to supply water for cooling the roller 201 to the water outlet small pipe 208, and the cooling valve 204 is installed at the junction of the water supply tank 6 and the water diversion pipe 207.

(6) Water supply pump

Referring to fig. 5, a water feed pump 7 is installed on the outer side of the furnace wall 5, a water inlet of the water feed pump 7 is communicated with a water outlet 407 of the waste heat water tank, and a water outlet of the water feed pump 7 is connected with a lower header 304 in the boiler body 3. The water feed pump 7 is used for inputting water in the waste heat water tank 4 into the lower header 304, and the water level in the boiler body 3 is kept in a normal water level range under the action of the water level controller 301, so that the operation safety of the boiler body 3 is prevented from being influenced by the abnormal water level of the boiler body 3.

(7) Feeding device

Referring to fig. 5, the solid arrow direction in the figure is the garbage moving direction. The feeding device 8 is arranged at the fuel inlet 506 and comprises a feeding hopper 801 and a boiler feeding motor 802. The feed hopper 801 is an inclined square hopper with a large upper opening and a small lower opening. The boiler feed motor 802 is disposed at the opening below the feed hopper 801, and is configured to push the garbage falling from the opening below the feed hopper 801 into the fuel inlet 506.

The specific working principle of the garbage incineration boiler is as follows:

1. garbage is poured into the feed hopper 801 from the upper opening of the feed hopper 801, falls off at the lower opening of the feed hopper 801, is pushed into the fuel inlet 506 by the boiler feed motor 802, and falls off on the conveying surface formed by the plurality of rollers 201.

The fire grate gear motor 209 is started to drive the rollers 201 to rotate unidirectionally, and the garbage is conveyed to the hearth 502 on a conveying surface formed by the rollers 201 to be ignited, so that the garbage is combusted and moves to the ash outlet 507 along with the conveying surface, and heat energy for evaporation is provided for the boiler body 3. A portion of the smaller size combustion ash falls from the gap between rollers 201 into the water tank 103 and settles at the bottom of the tank.

Ash residues generated after the incineration of the household garbage are poured into the water tank 103 through the ash outlet 507. Ash is deposited in the water tank 103, and most of the ash is deposited at the bottom of the water tank 103. The main body blow-down valve 303 on the lower header 304 is opened, the flushing pipe 108 is opened, the pressure of the flushing water flushes the ashes to the vicinity of the blow-down outlet, and the water tank blow-down valve 102 is opened to discharge the ashes.

2. The water supply tank 6 inputs water with relatively low temperature into the waste heat water tank 4 through a water pipe, the waste heat water tank 4 preheats the water input into the waste heat water tank 4 through the heat energy of the flue gas in the boiler body 3, and the preheated water is input into the lower header 304 through the water supply pump 7.

The water feed pump 7 powers the water in the lower header 304, causing the water to boil and evaporate as it is heated in the tube bundle 305 between the upper header 307 and the lower header 304, producing steam.

The heated water in the upper header 307 forms steam, which is fed into a steam drum 308, separated from water by a steam-water separator 309 to form dry steam, and flows out from a steam outlet 310 of the steam drum 308.

3. The waste in the furnace 502 is combusted to generate flue gas with higher temperature, and the flat steel forming the blocking member 306 blocks the flow of the flue gas to form an S-shaped flue gas flow path. When the flue gas flows to the flue pipe 403, the flue pipe 403 is relatively narrow, so that ash residues carried in the flue gas can be blocked to a certain extent, and the ash residues in the flue gas drop into the ash bin 504, so that the particle amount in the flue gas is reduced.

The flue gas passes through the flue pipe 403 and converges into a smoke box 501 at the top of the furnace wall 5, and a smoke outlet of the smoke box 501 is communicated with a flue gas treatment device, and the flue gas treatment device is used for effectively treating toxic and harmful substances contained in the flue gas to a concentration below a specified concentration.

In the description of the present specification, a description of the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, mechanism, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, mechanisms, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. The rolling fire grate is used for bearing combustion fuel and pushing combustion products and is characterized by comprising a transmission mechanism and a driving mechanism;

the transmission mechanism comprises a plurality of rollers which are arranged above the water tank side by side, and the rollers are arranged at intervals to form a gap for allowing air flow to pass through;

the driving mechanism is used for driving the roller to rotate unidirectionally around the axial direction of the roller to form a conveying surface for unidirectionally conveying driving fuel.

2. The rolling grate of claim 1, wherein a cooling channel is provided along the axial direction of the roller and extends through the roller, and wherein a small water outlet tube is inserted into the cooling channel, and an annular gap exists between the small water outlet tube and the cooling channel, so that the movement state of the small water outlet tube is independent of the movement state of the roller.

3. A waste incineration boiler, which is characterized by comprising the rolling grate according to any one of claims 1-2, a water tank, a hearth and a boiler body;

the hearth comprises a fuel inlet and an ash outlet, the rolling grate is arranged at the bottom of the hearth along the direction of the fuel inlet pointing to the ash outlet, and the rolling grate is communicated with the water tank.

4. A waste incineration boiler according to claim 3, wherein an air chamber which is vertically penetrated is formed between the water tank and the rolling grate, and the rolling grate and the water tank are respectively positioned at the upper and lower through holes of the air chamber; the water tank contains accumulated water, and the accumulated water can seal the through hole below the air chamber.

5. The garbage incinerator according to claim 4, wherein the air chamber is provided with a vent hole for inputting air thereto, one side of the water tank is provided with an overflow port, and the height of the overflow port is lower than that of the vent hole.

6. A waste incineration boiler according to claim 3, characterised in that the waste incineration boiler comprises a fan assembly and a plenum;

the fan assembly is used for ventilating the air chamber;

a plurality of partition boards are arranged in the air chamber, the partition boards divide the air chamber to form a plurality of relatively independent air compartments, and the air compartments are respectively communicated with all positions on the rolling fire grate; and air doors for controlling and inputting the air quantity corresponding to the air separation bin are arranged on any air separation bin.

7. A waste incineration boiler according to claim 3, wherein a flushing pipe and a drain outlet are respectively arranged on two opposite sides in the water tank, the drain outlet is positioned at the lowest part of the water tank, a water tank drain valve is arranged in the drain outlet, and the water outlet direction of the flushing pipe is directed to the drain outlet.

8. A waste incineration boiler according to claim 3, characterised in that the boiler body comprises an upper header, a lower header and a tube bundle at both sides, the tube bundle comprising several heated water tubes, the upper header and the lower header being in communication through the tube bundle; and blocking pieces for blocking the flow of the flue gas are connected to the tube bundles.

9. A waste incineration boiler according to claim 3, wherein a smoke flow path is formed between the rolling grate and the smoke outlet, a smoke pipe is arranged at one section of the smoke flow path, and an ash bin with an upward opening is arranged below the smoke flow path and corresponds to the position of the smoke pipe.

10. A waste incineration boiler according to claim 3, characterised in that a flue gas flow path is formed between the rolling grate and the flue gas outlet, and a waste heat water tank is arranged on the flue gas flow path, which waste heat water tank is respectively communicated with a water supply tank and the boiler body for supplying water after flue gas preheating to the boiler body.

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