Water-cooling flue gas partition plate structure and QXF boiler external denitration structure comprising same
By adopting a water-cooled flue gas baffle structure in the boiler, and utilizing a bare tube water-cooled screen and a refractory concrete layer, the problems of easy deformation and smoke leakage of the baffle are solved, thereby improving the boiler's resistance to deformation and wear, and enhancing the boiler's thermal efficiency and service life.
Patent Information
- Application Number
- CN202423266873.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-27
AI Technical Summary
The existing partition design is a steel plate covered concrete structure, which is prone to deformation and smoke leakage, has a short service life, and low strength.
The structure adopts a water-cooled flue gas baffle, including a bare tube water-cooled screen, a concrete layer and a furnace wall. The bare tube water-cooled screen is sealed to the ash drop window and is arranged at an angle. The structural strength and wear resistance are enhanced by refractory concrete layer and asphalt layer. The circulating working fluid inside the tube prevents overheating.
The problem of easy deformation and smoke leakage of the baffle plate was solved, the deformation resistance and wear resistance of the structure were improved, and the thermal efficiency and service life of the boiler were enhanced.
Smart Images
Figure CN223595893U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of water-cooled flue gas baffle structure and the QXF boiler denitration structure outside furnace comprising the structure, belong to energy heat exchange field. BACKGROUND
[0002] Boiler is a kind of energy conversion equipment, the energy input to boiler has chemical energy in fuel, electric energy, boiler exports have certain heat energy steam, high-temperature water or organic heat carrier.In the boiler reconstruction scheme, flue gas is introduced from the ash window to the outside of the furnace, cooled to about 350 DEG C by high-temperature economizer, and then introduced back into the furnace for SCR denitration and into the low-temperature economizer.A baffle needs to be set between the ash window and the economizer.
[0003] The existing baffle is designed as a steel plate covering concrete structure, which is prone to deformation and flue gas leakage.In addition, the existing steel plate covering concrete structure has low strength, short service life and is prone to collapse.
[0004] In summary, the existing baffle has the technical problems of deformation and flue gas leakage due to its steel plate covering concrete structure. SUMMARY
[0005] The utility model is to solve the above-mentioned technical problems of the existing baffle due to its steel plate covering concrete structure, and further provides a water-cooled flue gas baffle structure and a QXF boiler denitration structure outside furnace comprising the structure.
[0006] The technical solution of the utility model is a water-cooled flue gas baffle structure, which comprises a light pipe water-cooled screen, a concrete layer, an ash window and a furnace wall.
[0007] The light pipe water-cooled screen is in the shape of a plate, and the light pipe water-cooled screen is sealingly connected to the bottom end of the ash window.The light pipe water-cooled screen is arranged obliquely upwards, and the light pipe water-cooled screen is sealingly connected to the furnace wall around it.The light pipe water-cooled screen is in communication with the external water-cooled wall.
[0008] The concrete layer is laid on the top surface of the light pipe water-cooled screen.
[0009] The light pipe water-cooled screen comprises steel pipes arranged in a row, and the steel pipes contain flowing working medium.
[0010] As another improvement of the utility model, it further comprises a draw-off pipe, and the light pipe water-cooled screen is in communication with the external water-cooled wall through the draw-off pipe.
[0011] As another improvement of the utility model, the draw-off pipe comprises an upper layer pipe, a middle layer pipe and a lower layer pipe, and the upper layer pipe, the middle layer pipe and the lower layer pipe are arranged in parallel from top to bottom.
[0012] As another improvement of the utility model, the concrete layer adopts fireproof concrete.
[0013] As another improvement of the utility model, the light tube water cooling screen is sealingly connected with the surrounding furnace wall through a concrete seat.
[0014] As another improvement of the utility model, the concrete seat adopts fireproof concrete.
[0015] As another improvement of the utility model, the outer surface of the steel pipe is coated with an asphalt layer.
[0016] As another improvement of the utility model, the thickness of the asphalt layer is 2mm to 3mm.
[0017] The utility model also provides a kind of QXF boiler out-of-furnace denitration structure, including ash falling window, furnace wall, high-temperature coal economizer, low-temperature coal economizer, smoke air heat exchanger and SCR area, it is characterized in that, a kind of QXF boiler out-of-furnace denitration structure further include the water-cooled smoke gas baffle structure of claim 1, water-cooled smoke gas baffle structure and furnace wall are enclosed into flue, high-temperature coal economizer, smoke air heat exchanger, SCR area and low-temperature coal economizer are sequentially arranged in the flue along the direction of flow of flue gas.
[0018] As another improvement of the utility model, the number of SCR area is two, and the two SCR areas are sequentially arranged in the flue.
[0019] The utility model has the advantages that:
[0020] 1, the utility model is laid on the top surface of light tube water cooling screen with concrete layer, and light tube water cooling screen is communicated with water cooling wall, utilizes the advantage that water circulates in the pipe in light tube water cooling screen and does not deform by overheating, solves the technical problems, such as deformation and smoke leakage, of previous steel plate partition wall, light tube water cooling screen is arranged obliquely upwards, and almost no influence is generated to the overall thermal efficiency of boiler.
[0021] 2, the utility model is closed by fireproof concrete masonry, and fireproof concrete is laid on the pipe to prevent erosion and wear. DRAWINGS
[0022] Figure 1 It is the overall structure schematic view of the utility model a kind of water-cooled smoke gas baffle structure and the QXF boiler out-of-furnace denitration structure containing the structure.
[0023] Figure 2 It is Figure 1 the section schematic view of A-A in
[0024] Figure 3 It is Figure 1 the section schematic view of B-B in
[0025] Figure 4 Figure 1 is a schematic diagram of a QXF boiler denitration structure without using the water-cooled flue gas baffle structure of the present application. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the examples of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In the description of the present application, it is necessary to state that the positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are only the positional relationships based on the orientation shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the indicated components have a specific orientation, are constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0027] Specific embodiment one: in combination with Figures 1 to 4 In this embodiment, the water-cooled flue gas baffle structure comprises a light pipe water-cooled screen 1, a concrete layer 2, an ash falling window 3 and a furnace wall 4.
[0028] The light pipe water-cooled screen 1 is in the shape of a plate, and the light pipe water-cooled screen 1 is sealingly connected to the bottom end of the ash falling window 3. The light pipe water-cooled screen 1 is arranged obliquely upward, and the light pipe water-cooled screen 1 is sealingly connected to the surrounding furnace wall 4, and the light pipe water-cooled screen 1 is in communication with the external water-cooled wall.
[0029] The concrete layer 2 is laid on the top surface of the light pipe water-cooled screen 1. The concrete layer 2 can be provided in two layers and laid on the top surface and the bottom surface of the light pipe water-cooled screen 1, respectively. The upper concrete layer is laid in the area from the middle of the pipe of the light pipe water-cooled screen 1 to the area 90mm upward from the vertical pipe screen,
[0030] The light pipe water-cooled screen 1 comprises a steel pipe 5, which is arranged in rows. The steel pipe 5 is a single row of steel pipes with a diameter of 60mm and a pitch of 90mm, and the steel pipe 5 is filled with flowing working medium. The flowing working medium is water or water vapor.
[0031] Change the structure form of the upper part of the backwater wall, bend it with appropriate radius and angle, replace the original steel plate partition position, and change to a light tube water cooling screen. This design can better combine the concrete layer to prevent cracking and falling, etc. Take advantage of the strong self-bearing capacity of the steel tube row, the water circulating in the tube, and the advantage that it will not overheat and deform, to solve the technical problems of deformation and smoke leakage that exist in the previous steel plate partition wall. The light tube water cooling screen is arranged obliquely upward, and almost has no effect on the overall thermal efficiency of the boiler. The area of the furnace wall is sealed with concrete masonry, and the pipe is covered with refractory concrete to prevent erosion and wear. It takes into account the smoke turning and the separation of the inner chamber of the furnace, has strong anti-ash and anti-deformation ability, and high strength.
[0032] Specific implementation method two: combination Figures 1 to 4 This embodiment is different from the specific implementation method one in that it also includes a dilution pipe 6, and the light tube water cooling screen 1 is connected with the external water cooling wall through the dilution pipe 6. Low-temperature working medium flows in the tube, and the dilution pipe 6, as a special pipe segment of the light tube water cooling screen 1, cooperates with the ash hopper to form an ash falling window. Through the dilution pipe segment as the ash falling window, the ash particles in the flue gas are solidified and fall. The other components and connection methods are the same as those of the specific implementation method one.
[0033] Specific implementation method three: combination Figures 1 to 4 This embodiment is different from the specific implementation method one in that the dilution pipe 6 includes an upper layer pipe, a middle layer pipe, and a lower layer pipe, which are arranged in parallel from top to bottom. This design improves work efficiency. The other components and connection methods are the same as those of the specific implementation method one or two.
[0034] Specific implementation method four: combination Figures 1 to 4 This embodiment is different from the specific implementation method one in that the concrete layer 2 is made of refractory concrete. The refractory concrete contains aluminate components with high aluminum aggregate. The other components and connection methods are the same as those of any one of the specific implementation methods one to three.
[0035] Specific implementation method five: combination Figures 1 to 4 This embodiment is different from the specific implementation method one in that the light tube water cooling screen 1 is connected with the surrounding furnace wall 4 through a concrete seat. The whole is masonry to form a seal. The other components and connection methods are the same as those of any one of the specific implementation methods one to four.
[0036] Specific implementation method six: combination Figures 1 to 4 This embodiment is different from the specific implementation method one in that the concrete seat is made of refractory concrete. The refractory concrete contains aluminate components with high aluminum aggregate. The other components and connection methods are the same as those of any one of the specific implementation methods one to five.
[0037] Specific implementation method seven: combinationFigures 1 to 4 The embodiment is different from the first embodiment in that the outer surface of the steel pipe 5 is coated with a pitch layer.
[0038] Embodiment eight Figures 1 to 4 The embodiment is different from the first embodiment in that the thickness of the pitch layer is 2-3 mm.
[0039] Embodiment nine Figures 1 to 4 The embodiment is different from the first embodiment in that the embodiment provides a QXF boiler off-site denitration structure, which comprises an ash falling window 3, a furnace wall 4, a high-temperature economizer 7, a low-temperature economizer 10, a smoke-air heat exchanger 8 and an SCR area 9. Figure 1 The arrow direction is the smoke flow direction, and the flue comprises, in sequence along the smoke flow direction, the high-temperature economizer 7, the smoke-air heat exchanger 8, the SCR area 9 and the low-temperature economizer 10.
[0040] Embodiment ten Figures 1 to 4 The embodiment is different from the ninth embodiment in that the number of the SCR areas 9 is two, and the two SCR areas 9 are arranged in sequence in the flue.
[0041] Combination Figures 1 to 4 The working principle of the utility model is explained as follows:
[0042] The structure of the upper part of the rear water-cooled wall is changed to be bent at a proper radius and angle, replacing the position of the original steel plate partition and being changed into a light pipe water-cooled screen. The light pipe water-cooled screen is arranged obliquely upward, and almost has no influence on the overall thermal efficiency of the boiler. The area penetrating the furnace wall is sealed by masonry with concrete, and the pipe is coated with refractory concrete to prevent erosion and abrasion. The light pipe water-cooled screen has the functions of smoke turning and cavity separation, and has strong anti-accumulation and anti-deformation capabilities and high strength.
[0043] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A water-cooled flue gas dam structure, characterized by It comprises a light pipe water cooling screen (1), a concrete layer (2), a dust falling window (3) and a furnace wall (4); The light pipe water cooling screen (1) is in a plate shape, and the bottom end of the light pipe water cooling screen (1) is sealingly connected with the dust falling window (3); the light pipe water cooling screen (1) is arranged in an oblique direction, and the light pipe water cooling screen (1) is sealingly connected with the furnace wall (4) around the light pipe water cooling screen (1); the light pipe water cooling screen (1) is in communication with an external water cooling wall; The concrete layer (2) is laid on the top surface of the light pipe water cooling screen (1); The light pipe water cooling screen (1) comprises steel pipes (5), the steel pipes (5) are arranged in a row, and the steel pipes (5) are filled with a flowing working medium.
2. A water-cooled flue gas dam structure according to claim 1, characterized in that It further comprises a draw-off pipe (6), and the light pipe water cooling screen (1) is in communication with the external water cooling wall through the draw-off pipe (6).
3. A water-cooled flue gas dam structure according to claim 2, characterised in that The draw-off pipe (6) comprises upper pipes, middle pipes and lower pipes, and the upper pipes, the middle pipes and the lower pipes are arranged in parallel from top to bottom.
4. A water-cooled flue gas damper structure according to claim 1, characterized in that The concrete layer (2) is made of refractory concrete.
5. A water-cooled flue gas damper structure according to claim 1, characterized in that, The light pipe water cooling screen (1) is sealingly connected with the furnace wall (4) around the light pipe water cooling screen (1) through a concrete seat.
6. A water-cooled flue gas damper structure according to claim 5, wherein The concrete seat is made of refractory concrete.
7. A water-cooled flue gas damper structure according to claim 1, characterized in that The outer surface of the steel pipe (5) is coated with an asphalt layer.
8. A water-cooled flue gas damper structure according to claim 7, characterized in that The thickness of the asphalt layer is 2mm to 3mm.
9. A QXF boiler off-site denitration structure, comprising an ash falling window (3), a furnace wall (4), a high-temperature economizer (7), a low-temperature economizer (10), a smoke-air heat exchanger (8) and an SCR zone (9), characterized in that, The QXF boiler denitration structure further comprises the water cooling smoke baffle structure in claim 1, and the water cooling smoke baffle structure and the furnace wall (4) form a flue, wherein the flue is sequentially provided with a high-temperature economizer (7), a smoke-air heat exchanger (8), an SCR area (9) and a low-temperature economizer (10) along the smoke flow direction.
10. The QXF boiler off-site denitration structure according to claim 9, characterized in that, The number of the SCR areas (9) is two, and the two SCR areas (9) are sequentially arranged in the flue.