CN114135893A - Material returning device and boiler - Google Patents
Material returning device and boiler Download PDFInfo
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- CN114135893A CN114135893A CN202111241871.9A CN202111241871A CN114135893A CN 114135893 A CN114135893 A CN 114135893A CN 202111241871 A CN202111241871 A CN 202111241871A CN 114135893 A CN114135893 A CN 114135893A
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- 239000000463 material Substances 0.000 title claims abstract description 191
- 230000007704 transition Effects 0.000 claims description 7
- 239000003245 coal Substances 0.000 abstract description 6
- 238000004321 preservation Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 6
- 230000009970 fire resistant effect Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002006 petroleum coke Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
Abstract
The application discloses returning charge device and boiler belongs to coal fired boiler technical field. The material returning device comprises a first material conveying section, a second material conveying section, a third material conveying section and a fourth material conveying section which are sequentially communicated, wherein the second material conveying section is provided with a first end and a second end, one end of the first material conveying section is connected with the first end, one end of the third material conveying section is connected with the second end, the first material conveying section is opposite to the third material conveying section, one end of the fourth material conveying section is connected with the other end of the third material conveying section, and the fourth material conveying section extends obliquely along the direction far away from the third material conveying section; the material returning device further comprises a heat exchange pipeline which is communicated with a medium inlet and a medium outlet of the economizer, and the heat exchange pipeline is in contact with the first material conveying section, the second material conveying section, the third material conveying section and the fourth material conveying section. The scheme can solve the problem that materials are accumulated in the material returning device due to high-temperature slagging, and then the material returning device is blocked.
Description
Technical Field
The application belongs to the technical field of coal fired boilers, and particularly relates to a material returning device and a boiler.
Background
The material returning device is a key structure in the boiler and is used for returning material particles captured by a separator of the boiler to a hearth.
The material returning device needs heat preservation when being applied to a boiler, and the heat preservation is mainly realized by a mode of coating a wear-resistant and fire-resistant heat preservation material. However, this kind of method can make the returning charge device be in high temperature state to easily lead to materials such as petroleum coke, eastern Junggar coal or living beings slagging scorification, and then gather in the returning charge device, lead to the returning charge device to block up.
Disclosure of Invention
The purpose of the embodiment of the application is to provide a material returning device and a boiler, and the problem that the material is accumulated in the material returning device due to high-temperature slagging can be solved, and then the material returning device is blocked.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a material returning device, which includes a first material conveying section, a second material conveying section, a third material conveying section and a fourth material conveying section that are sequentially communicated, where the second material conveying section has a first end and a second end, one end of the first material conveying section is connected to the first end, one end of the third material conveying section is connected to the second end, the first material conveying section is opposite to the third material conveying section, one end of the fourth material conveying section is connected to the other end of the third material conveying section, and the fourth material conveying section extends obliquely in a direction away from the third material conveying section;
the material returning device further comprises a heat exchange pipeline which is communicated with a medium inlet and a medium outlet of the economizer, and the heat exchange pipeline is in contact with the first material conveying section, the second material conveying section, the third material conveying section and the fourth material conveying section.
In a second aspect, an embodiment of the present application provides a boiler, which includes an economizer and the above-mentioned material returning device, wherein both a medium inlet and a medium outlet of the economizer are communicated with the heat exchange pipeline.
In this application embodiment, the medium gets into heat transfer pipeline, then absorbs the heat that the material in first material transport section, second material transport section, third material transport section and the fourth material transport section carried, and can transport heat transfer pipeline out with the absorbed heat, thereby can reduce the temperature of returning charge device, and then can avoid the returning charge device to be in the condition emergence of material slagging scorification such as petroleum coke, accurate east coal or living beings that leads to under the high temperature state, with this avoid returning charge device to be blockked up. In addition, heat exchange pipe is when preventing the heat in the returning charge device and external environment direct exchange, and after the medium among the heat exchange pipe absorbed the heat, it can also reduce the material in the returning charge device and external environment's the difference in temperature to can keep warm to the returning charge device better. In addition, compared with a mode of realizing heat preservation by coating the wear-resistant and fire-resistant heat preservation material, the mode can reduce the tedious construction and can avoid the consumption of a large amount of wear-resistant and fire-resistant heat preservation materials.
Drawings
FIG. 1 is a schematic structural diagram of a boiler disclosed in an embodiment of the present application;
fig. 2 to fig. 3 are schematic structural diagrams of a part of a material returning device disclosed in an embodiment of the present application;
fig. 4 to 6 are schematic structural views of a material returning device disclosed in an embodiment of the present application;
FIG. 7 is a left side view of FIG. 6;
FIG. 8 is a right side view of FIG. 6;
FIG. 9 is a top view of FIG. 6;
FIG. 10 is a bottom view of FIG. 6;
FIG. 11 is a sectional view taken along line A-A of FIG. 6;
FIG. 12 is a sectional view taken along line B-B of FIG. 6;
fig. 13 is a cross-sectional view taken along line C-C of fig. 6.
Description of reference numerals:
110-a first material conveying section, 111-a first surface, 112-a second surface, 113-a third surface and 114-a feeding port;
120-a second material conveying section;
130-a third material conveying section, 131-a fifth surface, 132-a sixth surface, 133-a seventh surface, 134-a thirteenth surface;
140-a fourth material conveying section, 141-a ninth surface, 142-a tenth surface, 143-a tenth surface and 144-a discharge port;
150-a first heat exchange tube, 151-a second heat exchange tube, 152-a third heat exchange tube, 153-a fourth heat exchange tube, 154-a fifth heat exchange tube, 155-a sixth heat exchange tube, 156-a seventh heat exchange tube, 157-an eighth heat exchange tube, 158-a ninth heat exchange tube, 159-a tenth heat exchange tube;
160-first inlet header;
170-first drain header;
180-a second inlet end header;
190-a third inlet header;
200-a second discharge header, 201-a third section, 202-a fourth section, 203-a fifth section;
210-transition header, 211-first section, 212-second section;
220-a coal economizer;
230-medium circulation pipeline, 231-first through pipe and 232-second through pipe;
240-a flow control valve;
250-a hearth;
260-a separator;
270-tail flue;
280-vertical pipe.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The material returning device provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
As shown in fig. 1 to 13, the embodiment of the present application discloses a material returning device, which includes a first material conveying section 110, a second material conveying section 120, a third material conveying section 130 and a fourth material conveying section 140 that are sequentially connected, where the second material conveying section 120 has a first end and a second end, one end of the first material conveying section 110 is connected to the first end, one end of the third material conveying section 130 is connected to the second end, the first material conveying section 110 is opposite to the third material conveying section 130, one end of the fourth material conveying section 140 is connected to the other end of the third material conveying section 130, and the fourth material conveying section 140 extends obliquely along a direction away from the third material conveying section 130.
The material returning device further comprises a heat exchange pipeline which is used for being communicated with both the medium inlet and the medium outlet of the economizer 220, and the heat exchange pipeline is in contact with the first material conveying section 110, the second material conveying section 120, the third material conveying section 130 and the fourth material conveying section 140.
Material from separator 260 enters from inlet 114 of the return device and then flows along first material conveying section 110, second material conveying section 120, third material conveying section 130, and fourth material conveying section 140. It should be noted that the flow direction of the material refers to the main and macroscopic flow direction of the material in each material conveying section, and the complicated flow direction of the material which may be at a local or microscopic level is ignored. For example, in the first material conveying section 110, the predominant, macroscopic direction of flow of material is the direction of gravity. The material may have a complex flow direction at a local or microscopic level that is different from the main, macroscopic flow direction, e.g. a transition of the material flow direction at the intersection of the material conveying sections. This is done to avoid ambiguity.
In this application embodiment, the medium gets into heat transfer pipeline, then absorbs the heat that the material in first material transport section 110, second material transport section 120, third material transport section 130 and fourth material transport section 140 carried to can transport the heat transfer pipeline out with the absorbed heat, thereby can reduce the temperature of returning charge device, and then can avoid the condition emergence of material slagging scorification such as petroleum coke, accurate east coal or living beings that the returning charge device leads to under the high temperature state, avoid the returning charge device to be blockked up with this. In addition, heat exchange pipe is when preventing the heat in the returning charge device and external environment direct exchange, and after the medium among the heat exchange pipe absorbed the heat, it can also reduce the material in the returning charge device and external environment's the difference in temperature to can keep warm to the returning charge device better. In addition, compared with a mode of realizing heat preservation by coating the wear-resistant and fire-resistant heat preservation material, the mode can reduce the tedious construction and can avoid the consumption of a large amount of wear-resistant and fire-resistant heat preservation materials.
The material returning device is provided with a bottom and a top, a material outlet 144 of the material returning device is arranged at the bottom, a material inlet 114 of the material returning device is arranged at the top, and the position of the material inlet 114 is higher than that of the material outlet 144. The material returning device further comprises a first inlet end header 160 and a first outlet end header 170, and the first inlet end header 160 is communicated with the first outlet end header 170 through a heat exchange pipeline. The medium may enter from the first inlet header 160, then flow through heat exchange tubes to the first outlet header 170, and finally flow out of the first outlet header 170. In one embodiment, the first inlet header 160 is disposed at the top and the first outlet header 170 is disposed at the bottom. In this embodiment, the medium flows from top to bottom at least in part of the heat exchange tubes, i.e. the medium flows downwards under the influence of gravity. This situation may lead to a situation in which the heat exchange tubes are not filled with medium, which is detrimental to the heat exchange. Therefore, in another embodiment, the first inlet header 160 is disposed at the bottom, and the first outlet header 170 is disposed at the top, so as to avoid the situation that the heat exchange pipeline is not filled with the medium, thereby ensuring that the material in the material returning device and the medium in the heat exchange pipeline can exchange heat well. In other words, by adopting the above arrangement, the medium can flow against gravity in the heat exchange pipeline, and therefore, in the heat exchange process, the heat exchange pipeline in contact with the second material conveying section 120 is in a medium full state, but not in a half full state, so that the potential safety hazard of water power generation can be avoided. The hydrodynamic safety hidden danger refers to that the media in the heat exchange pipeline in contact with the second material conveying section 120 are in a vapor-liquid two-phase state, and the two-phase media can generate vapor-liquid layering (the vapor phase is on the upper part, and the liquid phase is on the lower part) when flowing, so that the heat transfer of the media in the heat exchange pipeline is deteriorated, and further, an overtemperature pipe explosion accident caused by insufficient cooling of the media in the heat exchange pipeline is caused. Therefore, the accident can be avoided by the arrangement mode. Alternatively, the first inlet header 160 may be shaped as a bar, and the first outlet header 170 may be shaped as a ring.
The structure formed by the first material conveying section 110 and the second material conveying section 120 has a first surface 111, a second surface 112, a third surface 113 and a fourth surface which are connected in sequence, the first surface 111 and the third surface 113 are opposite, and the second surface 112 and the fourth surface are opposite. The third material conveying section 130 has a fifth surface 131, a sixth surface 132, a seventh surface 133 and an eighth surface connected in sequence, the fifth surface 131 and the seventh surface 133 are opposite to each other, the sixth surface 132 and the eighth surface are opposite to each other, and the fifth surface 131 faces the first surface 111. It should be noted that the first surface 111 and the third surface 113 may be an L-shaped surface, and the remaining surfaces may be flat surfaces, arc surfaces, or other types of surfaces, which is not limited in this embodiment of the present invention. In an alternative embodiment, the first inlet header 160 is disposed at the junction of the first surface 111 and the fifth surface 131, and the first outlet header 170 is disposed at the inlet 114. In this embodiment, in order to enable the third surface 113 to exchange heat, the medium entering from the first inlet end header 160 needs to flow into the heat exchange pipe disposed on the third surface 113, and in this process, the medium flows under the action of gravity, so that a state that part of the heat exchange pipe is not filled with the medium easily occurs, and thus the material and the medium are not favorable for performing good heat exchange. Therefore, in another alternative embodiment, the first inlet header 160 is disposed at the connection position of the third surface 113 and the seventh surface 133, and the first outlet header 170 is disposed at the inlet 114. Because the first inlet end header 160 is disposed at the connection position of the third surface 113 and the seventh surface 133, the medium entering the first inlet end header 160 flows from the bottom to the top, so that the above situation can be avoided, and good heat exchange between the material and the medium is facilitated.
In the above-mentioned embodiment, in order to guarantee that the returning charge device has good heat transfer and heat preservation effect simultaneously, all can be equipped with heat transfer pipeline on each face. Since the first inlet header 160 is disposed at the connection position of the third surface 113 and the seventh surface 133, the heat exchange tube may have a plurality of bends. If the bent part of the heat exchange pipeline is too much, the flow speed of the medium in the material returning device can be influenced, and further the heat exchange efficiency of the medium is low easily. Therefore, in an embodiment, the material returning device further includes a second entering-end header 180, and the second entering-end header 180 is disposed at a connection position of the first surface 111 and the fifth surface 131. The heat exchange pipes include a first heat exchange pipe 150, a second heat exchange pipe 151, a third heat exchange pipe 152, and a fourth heat exchange pipe 153, the first inlet end header 160 is communicated with the first outlet end header 170 through the first heat exchange pipe 150, and the first heat exchange pipe 150 is attached to the third face 113. The first inlet end header 160 communicates with the first outlet end header 170 through the second heat exchange pipe 151, and the second heat exchange pipe 151 is attached to the seventh face 133 and the second face 112. The second inlet header 180 is communicated with the first outlet header 170 through a third heat exchange tube 152, and the third heat exchange tube 152 is attached to the first surface 111. The first inlet end header 160 communicates with the first outlet end header 170 through the fourth heat exchanging pipe 153, and the fourth heat exchanging pipe 153 is attached to the seventh and fourth faces 133 and 133. In this embodiment, the second inlet end header 180 is disposed at the joint of the first surface 111 and the fifth surface 131, so that the number of times of bending the heat exchange pipe can be reduced, the influence of the heat exchange pipe on the flow velocity of the medium can be reduced, and the heat exchange efficiency of the medium can be ensured. In addition, by adding the second inlet end header 180, the flow of the medium entering the heat exchange pipeline can be increased, which is beneficial to further improving the heat exchange effect.
The fourth material conveying section 140 has a ninth surface 141, a tenth surface 142, a tenth surface 143, and a tenth surface, which are connected in sequence, the third material conveying section 130 further has a thirteenth surface 134, the ninth surface 141 is connected to the fifth surface 131 through the tenth surface 134, the tenth surface 142 is connected to the sixth surface 132, the tenth surface 143 is connected to the seventh surface 133, and the tenth surface is connected to the eighth surface. In order to further ensure that the material returning device has good heat exchange and heat preservation effects, heat exchange pipelines are arranged on each surface of the material returning device, the medium flows into the first inlet end header 160 arranged at the joint of the third surface 113 and the seventh surface 133 and flows out of the first outlet end header 170 arranged at the material inlet 114, so that the flowing path of the medium in the heat exchange pipelines is longer, the carried heat is more, the regional heat exchange effect close to the first outlet end header 170 is poor, and the temperature difference between different regions in the heat exchange pipelines is easily larger. Therefore, in an alternative embodiment, the material returning device further includes a third inlet header 190 and a second outlet header 200, the third inlet header 190 is disposed at the outlet 144, and the second outlet header 200 is disposed at the third material conveying section 130. The heat exchange pipeline further comprises a fifth heat exchange pipe 154, a sixth heat exchange pipe 155, a seventh heat exchange pipe 156, an eighth heat exchange pipe 157, a ninth heat exchange pipe 158 and a tenth heat exchange pipe 159, wherein the eighth heat exchange pipe 157 and the ninth heat exchange pipe 158 are communicated with the seventh heat exchange pipe 156. The third inlet header 190 communicates with the second outlet header 200 through the fifth heat exchanging pipe 154, and the fifth heat exchanging pipe 154 is attached to the ninth and thirteenth faces 141 and 134. The third inlet header 190 communicates with the second outlet header 200 through the sixth heat exchange pipe 155, and the sixth heat exchange pipe 155 is attached to the tenth and sixth faces 142 and 132. The third inlet header 190 is communicated with the second outlet header 200 through a seventh heat exchange tube 156, an eighth heat exchange tube 157 and a ninth heat exchange tube 158, the seventh heat exchange tube 156 is attached to the eleventh surface 143, the eighth heat exchange tube 157 is attached to the seventh surface 133, the sixth surface 132 and the fifth surface 131, and the ninth heat exchange tube 158 is attached to the seventh surface 133, the eighth surface and the fifth surface 131. The third inlet header 190 is communicated with the second outlet header 200 through a tenth heat exchange pipe 159, and the tenth heat exchange pipe 159 is attached to the tenth and eighth faces. In this embodiment, the third inlet header 190 and the second outlet header 200 can prevent the medium from flowing too long in the heat exchange pipe, so as to improve the heat exchange effect and reduce the temperature difference between different regions in the heat exchange pipe. The third inlet header 190 may be annular, and the medium from the medium inlet of the economizer 220 may enter the heat exchange pipeline after being mixed in the third inlet header 190, so as to facilitate the temperature difference of the medium entering the heat exchange pipeline to be smaller, avoid the difference in expansion amount caused by the large temperature difference of the medium on the heat exchange pipelines on different surfaces, and further avoid the cracking of the heat exchange pipeline.
Due to the action of gravity, when the material flows in the fourth material conveying section 140, the contact chance with the bottom wall (i.e., the position where the tenth surface 143 is located) of the fourth material conveying section 140 is more, and the contact area is larger, so that the temperature of the eleventh surface 143 is easily higher, and thus the heat absorbed by the medium in the heat exchange pipeline is more, which is not beneficial to the subsequent heat exchange of the heat in the heat exchange pipeline. Therefore, in an alternative embodiment, the material returning device further includes a transition header 210, the transition header 210 includes a first section 211 and a second section 212 that are communicated with each other, the first section 211 is disposed at a connection position of the seventh surface 133 and the eleventh surface 143, the second section 212 is disposed on the seventh surface 133, and the second section 212 is perpendicular to the first section 211 and extends in a direction away from the first section 211. The third inlet header 190 communicates with the first section 211 through a seventh heat exchange tube 156. The second section 212 communicates with the second discharge header 200 through an eighth heat exchange tube 157. The second section 212 communicates with the second discharge header 200 through a ninth heat exchange tube 158. When the medium flows into the transition header 210, on the one hand, mixing can be performed, so that the temperature of the medium tends to be uniform, and local over-high temperature is avoided, and on the other hand, the transition header 210 can be utilized for heat dissipation, so that the temperature of the medium is reduced, and the subsequent heat exchange of the medium is facilitated.
In one embodiment, the number of the fifth heat exchanging pipes 154 and the number of the seventh heat exchanging pipes 156 are both multiple, and the number of the seventh heat exchanging pipes 156 is less than or equal to the number of the fifth heat exchanging pipes 154. When the material flows in the fourth material conveying section 140, the contact chance with the bottom wall (that is, the position where the eleventh surface is located) of the fourth material conveying section 140 is more, and the contact area is larger, so that the temperature of the eleventh surface 143 is easily caused to be higher, and if the number of the heat exchange tubes is smaller, the local temperature of the material returning device is easily caused to be too high, and the local temperature of the heat exchange tube is easily caused to be too high, so that the expansion amount of the heat exchange tube is larger, and the heat exchange tube is easily damaged. Therefore, in another embodiment, the number of the seventh heat exchanging pipes 156 is greater than that of the fifth heat exchanging pipes 154. The heat of the tenth side 143 can be rapidly transported away through a large number of seventh heat exchange pipes 156, so that the local temperature of the material returning device and the heat exchange pipes can be prevented from being too high, and the heat exchange pipes can be protected from being damaged.
In an alternative embodiment, the second discharge header 200 includes a fourth segment 202, and the fourth segment 202 is disposed at the junction of the fifth face 131 and the thirteenth face 134. In this embodiment, since the heat exchange tubes of the sixth face 132 and the eighth face need to communicate with the second discharge end header 200, the above arrangement does not facilitate the communication between the heat exchange tubes of the sixth face 132 and the eighth face and the second discharge end header 200. Therefore, in another alternative embodiment, the second discharge end header 200 further includes a third segment 201 and a fifth segment 203, the third segment 201 is communicated with the fifth segment 203 through a fourth segment 202, the third segment 201 is disposed at the junction of the fifth surface 131 and the sixth surface 132, and the fifth segment 203 is disposed at the junction of the fifth surface 131 and the eighth surface. After the arrangement, the heat exchange pipeline on the sixth surface 132 is communicated with the third section 201, the heat exchange pipeline on the thirteenth surface 134 is communicated with the fourth end, and the heat exchange pipeline on the eighth surface is communicated with the fifth section 203, so that the connection is more convenient, and the bending times of the heat exchange pipeline are reduced.
The embodiment of the application also discloses a boiler, which comprises a hearth 250, a separator 260, an economizer 220 and the material returning device in any embodiment, wherein the hearth 250, the separator 260 and the material returning device form a main circulating channel of the boiler. In addition, the boiler also comprises an economizer 220 and a tail flue 270, wherein both a medium inlet and a medium outlet of the economizer 220 are communicated with the heat exchange pipeline. That is, the heat exchange pipe is connected in parallel with the economizer 220. The economizer 220 is disposed in the back flue 270, and a medium flowing in the economizer 220 flows from bottom to top in the direction of gravity and exchanges heat in the back flue 270. In addition, the medium flows in from the medium inlet of the economizer 220, flows out from the medium outlet after passing through the heat exchange pipe, and during the period, the pressure loss of the medium is small, the medium can smoothly flow out of the medium outlet, and the influence on the normal working state of other pipelines is small. Alternatively, the boiler may be a large circulating fluidized bed boiler. The return device may be connected to the separator 260 via a riser 280, and when the boiler is a 130t/h boiler, the diameter D of the riser 280 may be 600 mm; the diameter D of the riser 280 may be greater than or equal to 1300mm when the boiler is a 1025t/h (300MW) boiler. The t/h is a unit of measurement of the size of the boiler, is called as steaming ton, and is how many tons of steam can be generated by the boiler per hour. The diameter D of the riser 280 may be an outer diameter of the riser 280 or an inner diameter of the riser 280, which is not limited in the embodiments of the present application. The outer diameter refers to the diameter of a circle tangent to the outer surface of the riser 280, and the inner diameter refers to the diameter of a circle tangent to the inner surface of the riser 280. The length of the second material conveying section 120 in the embodiments of the present application may be greater than or equal to 3D.
In one embodiment, the boiler further comprises a medium circulation conduit 230 and a flow control valve 240, the medium circulation conduit 230 comprising a first duct 231 and a second duct 232. The medium inlet is communicated with the heat exchange pipeline through a first through pipe 231, and the medium outlet is communicated with the heat exchange pipeline through a second through pipe 232. Because the height difference between the economizer 220 and the material returning device is small and the distance is short, the first through pipe 231 and the second through pipe 232 can be short, so that the construction cost and the maintenance cost are low. To achieve control of the flow rate of the mediumSo as to improve the heat exchange effect better, the boiler further includes a flow control valve 240, and the flow control valve 240 is disposed on the first through pipe 231, the second through pipe 232, the medium inlet, or the medium outlet. Because the distribution of material concentration and speed in the material returning device has obvious inhomogeneous phenomenon, consequently, the thermal load on the material returning device also can have inhomogeneous phenomenon of distribution to bring hydrodynamic force potential safety's easy. In order to solve the hidden trouble, the flow rate of the medium can be controlled to be 1000 kg/(m) through the flow control valve 2402S) to ensure that the medium in the heat exchange pipe is in a low mass flow rate state, and the medium is ensured to have self-compensation characteristic, namely, the medium in the heat exchange pipe heated strongly is large in flow, and the medium in the heat exchange pipe heated weakly is small in flow.
In an alternative embodiment, the boiler may further comprise a feed water pump disposed at the medium inlet of the economizer 220. The medium flowing mode in the heat exchange pipeline can be changed from a natural circulation mode to a forced circulation mode through the feed water pump. The forced circulation mode is that a medium is sent into the heat exchange pipeline under higher pressure through the water feeding pump, so that the heat exchange pipeline has higher flow and the flow velocity of the medium is higher, the heat exchange effect can be improved, and the hydrodynamic safety hidden trouble caused by the natural circulation mode can be avoided. It is understood that the natural circulation mode herein refers to a mode in which the pressurization of the feed water pump is not employed.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The material returning device is characterized by comprising a first material conveying section (110), a second material conveying section (120), a third material conveying section (130) and a fourth material conveying section (140) which are sequentially communicated, wherein the second material conveying section (120) is provided with a first end and a second end, one end of the first material conveying section (110) is connected with the first end, one end of the third material conveying section (130) is connected with the second end, the first material conveying section (110) is opposite to the third material conveying section (130), one end of the fourth material conveying section (140) is connected with the other end of the third material conveying section (130), and the fourth material conveying section (140) extends obliquely along the direction far away from the third material conveying section (130);
the material returning device further comprises a heat exchange pipeline which is used for being communicated with a medium inlet and a medium outlet of an economizer (220), and the heat exchange pipeline is in contact with the first material conveying section (110), the second material conveying section (120), the third material conveying section (130) and the fourth material conveying section (140).
2. The material returning device according to claim 1, wherein the material returning device has a bottom and a top, the material outlet (144) of the material returning device is arranged at the bottom, the material inlet (114) of the material returning device is arranged at the top, and the material inlet (114) is located at a position higher than the material outlet (144);
the material returning device further comprises a first inlet end header (160) and a first outlet end header (170), the first inlet end header (160) is arranged at the bottom, the first outlet end header (170) is arranged at the top, and the first inlet end header (160) is communicated with the first outlet end header (170) through the heat exchange pipeline.
3. A return device according to claim 2, wherein the first material conveying section (110) and the second material conveying section (120) jointly form a structure having a first face (111), a second face (112), a third face (113) and a fourth face connected in sequence, the first face (111) and the third face (113) being opposite to each other, and the second face (112) and the fourth face being opposite to each other;
the third material conveying section (130) is provided with a fifth surface (131), a sixth surface (132), a seventh surface (133) and an eighth surface which are connected in sequence, the fifth surface (131) is opposite to the seventh surface (133), the sixth surface (132) is opposite to the eighth surface, wherein the fifth surface (131) faces to the first surface (111);
the first inlet end header (160) is arranged at the joint of the third surface (113) and the seventh surface (133), and the first outlet end header (170) is arranged at the feeding port (114).
4. A return device according to claim 3, further comprising a second inlet end header (180), said second inlet end header (180) being arranged at the junction of said first face (111) and said fifth face (131);
the heat exchange pipeline comprises a first heat exchange pipe (150), a second heat exchange pipe (151), a third heat exchange pipe (152) and a fourth heat exchange pipe (153), the first inlet end header (160) is communicated with the first outlet end header (170) through the first heat exchange pipe (150), and the first heat exchange pipe (150) is attached to the third surface (113);
the first inlet end header (160) is communicated with the first outlet end header (170) through the second heat exchange pipe (151), and the second heat exchange pipe (151) is attached to the seventh face (133) and the second face (112);
the second inlet end header (180) is communicated with the first outlet end header (170) through a third heat exchange tube (152), and the third heat exchange tube (152) is attached to the first surface (111);
the first inlet end header (160) is communicated with the first outlet end header (170) through the fourth heat exchange tube (153), and the fourth heat exchange tube (153) is attached to the seventh surface (133) and the fourth surface.
5. A return device according to claim 3, wherein the fourth material conveying section (140) has a ninth face (141), a tenth face (142), a tenth face (143) and a tenth face connected in sequence, the third material conveying section (130) further has a tenth face (134), the ninth face (141) is connected to the fifth face (131) through the tenth face (134), the tenth face (142) is connected to the sixth face (132), the tenth face (143) is connected to the seventh face (133), and the tenth face is connected to the eighth face;
the material returning device further comprises a third inlet end collecting box (190) and a second outlet end collecting box (200), the third inlet end collecting box (190) is arranged at the material outlet (144), and the second outlet end collecting box (200) is arranged at the third material conveying section (130);
the heat exchange pipeline further comprises a fifth heat exchange pipe (154), a sixth heat exchange pipe (155), a seventh heat exchange pipe (156), an eighth heat exchange pipe (157), a ninth heat exchange pipe (158) and a tenth heat exchange pipe (159), wherein the eighth heat exchange pipe (157) and the ninth heat exchange pipe (158) are communicated with the seventh heat exchange pipe (156);
the third inlet end header (190) is communicated with the second outlet end header (200) through the fifth heat exchange pipe (154), and the fifth heat exchange pipe (154) is attached to the ninth surface (141) and the tenth surface (134);
the third inlet header (190) is communicated with the second outlet header (200) through the sixth heat exchange pipe (155), and the sixth heat exchange pipe (155) is attached to the tenth surface (142) and the sixth surface (132);
the third inlet header (190) is communicated with the second outlet header (200) through the seventh heat exchange tube (156), the eighth heat exchange tube (157) and the ninth heat exchange tube (158), the seventh heat exchange tube (156) is attached to the tenth face (143), the eighth heat exchange tube (157) is attached to the seventh face (133), the sixth face (132) and the fifth face (131), and the ninth heat exchange tube (158) is attached to the seventh face (133), the eighth face and the fifth face (131);
the third inlet header (190) is communicated with the second outlet header (200) through the tenth heat exchange pipe (159), and the tenth heat exchange pipe (159) is attached to the tenth and eighth faces.
6. The return device according to claim 5, further comprising a transition header (210), wherein the transition header (210) comprises a first section (211) and a second section (212) which are communicated with each other, the first section (211) is arranged at the connection position of the seventh surface (133) and the tenth surface (143), the second section (212) is arranged on the seventh surface (133), and the second section (212) is perpendicular to the first section (211) and extends along the direction far away from the first section (211);
the third inlet header (190) communicates with the first section (211) through the seventh heat exchange tube (156);
said second section (212) communicating with said second discharge header (200) through said eighth heat exchange tube (157);
the second section (212) communicates with the second discharge header (200) through the ninth heat exchange tube (158).
7. The return material device according to claim 6, wherein the number of the fifth heat exchange pipe (154) and the seventh heat exchange pipe (156) is plural, and the number of the seventh heat exchange pipe (156) is more than the number of the fifth heat exchange pipe (154).
8. A returning charge device according to claim 5, characterized in that the second discharge header (200) comprises a third section (201), a fourth section (202) and a fifth section (203), the third section (201) is communicated with the fifth section (203) through the fourth section (202), the third section (201) is arranged at the joint of the fifth surface (131) and the sixth surface (132), the fourth section (202) is arranged at the joint of the fifth surface (131) and the thirteenth surface (134), and the fifth section (203) is arranged at the joint of the fifth surface (131) and the eighth surface.
9. A boiler, characterized in that it comprises an economizer (220) and a return device according to any one of claims 1 to 8, the economizer (220) having a medium inlet and a medium outlet both communicating with said heat exchange conduit.
10. A boiler according to claim 9, characterized in that it further comprises a medium flow conduit (230) and a flow control valve (240), said medium flow conduit (230) comprising a first duct (231) and a second duct (232);
the medium inlet is communicated with the heat exchange pipeline through the first through pipe (231), and the medium outlet is communicated with the heat exchange pipeline through the second through pipe (232);
the flow control valve (240) is disposed on the first pipe (231), the second pipe (232), the medium inlet, or the medium outlet.
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| CN202111241871.9A CN114135893B (en) | 2021-10-25 | 2021-10-25 | Material returning device and boiler |
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| CN202111241871.9A CN114135893B (en) | 2021-10-25 | 2021-10-25 | Material returning device and boiler |
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| CN114135893B CN114135893B (en) | 2024-04-12 |
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|---|---|
| CN114135893B (en) | 2024-04-12 |
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