A two-stage screen device for solid waste incineration circulating fluidized bed boiler
By designing a two-stage screen overhead device in a solid waste incineration circulating fluidized bed boiler, using corrosion-resistant materials and water-sprayed temperature reducer, the corrosion and expansion problems of the screen superheater are solved, and the long-term stable operation of the boiler and the extension of the equipment life are achieved.
Patent Information
- Application Number
- CN202420635967.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-03-29
AI Technical Summary
The screen superheater in the furnace of solid waste incineration circulating fluidized bed boiler has corrosion and expansion problems, which affects its life and stable operation.
A two-stage screen pass device for solid waste incineration circulating fluidized bed boiler was designed, using SA-213 TP347H material screen superheater pipes, and a water spray temperature reducer was arranged in the inlet section to ensure the control of steam temperature and avoid overtemperature. At the same time, the steam flow direction of the medium-temperature high-temperature screen superheater is from bottom to top, consistent with the flue gas flow direction, reducing the stress at the bottom elbow.
It effectively reduces the corrosion and expansion problems of screen superheaters, extends its life, and ensures the long-term and stable operation of the boiler.
Smart Images
Figure CN222718185U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a platen-type superheater arrangement structure of a circulating fluidized bed boiler, in particular to a two-stage platen-type superheater device for a solid waste incineration circulating fluidized bed boiler, which is used to solve the problems of platen expansion, corrosion and overheating in the furnace of the solid waste incineration circulating fluidized bed boiler, and belongs to the field of circulating fluidized bed incineration boilers. Background Art
[0002] In recent years, as sludge incineration power generation technology has become more mature, enterprises have further increased their requirements for fluidized bed incineration technology. The solid waste incineration circulating fluidized bed boiler has a wide range of fuel practicability. It can burn low calorific value and high ash sludge fuels such as urban municipal sludge and industrial printing and dyeing sludge, and the atmospheric pollutant emission data values are relatively low.
[0003] As the boiler pressure parameters are gradually increased to high temperature and high pressure, the original furnace water-cooled wall is a cavity structure. Now it is necessary to arrange a two-stage screen superheater in the furnace water-cooled wall to ensure the steam parameters. Since the sludge fuel contains a small amount of chloride ions, it will cause high-temperature corrosion to the screen superheater, affecting the life of the screen superheater. Therefore, the screen superheater tubes are made of high-temperature corrosion-resistant SA-213 TP347H material. When this type of pipe is used, the expansion of the screen superheater is larger than that of conventional materials, which may cause the screen of the screen superheater to expand and deform.
[0004] Therefore, it is particularly necessary to provide a reasonable structural design that can simultaneously solve the problems of corrosion and expansion of the platen superheater. Utility Model Content
[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a two-stage screen device for a solid waste incineration circulating fluidized bed boiler which has a simple and reasonable structural design, is safe and reliable, and can ensure long-term stable operation of the boiler.
[0006] The technical solution adopted by the utility model to solve the above-mentioned problems is: the two-stage screen device of the solid waste incineration circulating fluidized bed boiler includes a medium-temperature screen superheater inlet pipe, a medium-temperature screen superheater outlet pipe, a high-temperature screen superheater outlet pipe, a steam collecting box and a furnace water-cooled wall. The medium-temperature screen superheater outlet pipe and the high-temperature screen superheater outlet pipe are both connected to the steam collecting box. It is characterized in that it also includes a medium-temperature screen superheater inlet header, a medium-temperature screen superheater, a medium-temperature screen superheater outlet header, a high-temperature screen superheater inlet header, a high-temperature screen superheater and a high-temperature screen superheater outlet header. The medium-temperature screen superheater, The high-temperature screen superheater and the medium-temperature screen superheater are connected with a medium-temperature screen superheater inlet pipe and a medium-temperature screen superheater outlet pipe, and the high-temperature screen superheater is connected with a high-temperature screen superheater outlet pipe; the inlet of the medium-temperature screen superheater is connected with a medium-temperature screen superheater inlet header, and the outlet of the medium-temperature screen superheater is connected with a medium-temperature screen superheater outlet header, and the medium-temperature screen superheater inlet header is connected with the medium-temperature screen superheater outlet header; the inlet of the high-temperature screen superheater is connected with a high-temperature screen superheater inlet header, and the outlet of the high-temperature screen superheater is connected with a high-temperature screen superheater outlet header, and the high-temperature screen superheater inlet header is connected with the high-temperature screen superheater outlet header.
[0007] Preferably, a first-stage desuperheater is arranged on the inlet pipe of the medium-temperature screen superheater of the utility model, and a second-stage desuperheater is arranged on the outlet pipe of the medium-temperature screen superheater.
[0008] Preferably, the medium-temperature screen superheater inlet header and the medium-temperature screen superheater outlet header of the utility model are connected as a whole and are located on the outer side of the upper part of the furnace water-cooled wall; the high-temperature screen superheater inlet header and the high-temperature screen superheater outlet header are connected as a whole and are located on the outer side of the upper part of the furnace water-cooled wall.
[0009] Preferably, the steam flow direction in the tubes of the medium-temperature screen superheater and the high-temperature screen superheater described in the utility model is from bottom to top, which is the same as the flow direction of the high-temperature flue gas in the water-cooled wall of the furnace.
[0010] Preferably, the pipe materials of the medium-temperature screen superheater and the high-temperature screen superheater of the utility model are both SA-213 TP347H, which is more corrosion-resistant and wear-resistant.
[0011] Preferably, water spray desuperheaters are arranged on the inlet pipes of the medium-temperature screen superheater and the high-temperature screen superheater described in the utility model; the steam temperature can be accurately controlled to ensure that the screen outlet temperature does not exceed the temperature.
[0012] Compared with the prior art, the utility model has the following advantages and effects: 1) The steam flow direction of the medium-temperature screen superheater and the high-temperature screen superheater is from bottom to top, which is consistent with the flue gas flow direction, which is conducive to improving the stress at the elbow at the bottom of the screen superheater and has an advantage in the uniformity of the temperature field along the height direction of the furnace; 2) The pipes of the medium-temperature screen superheater and the high-temperature screen superheater are all made of SA-213 TP347H is made of a material that is more corrosion-resistant and wear-resistant; 3) Water spray desuperheaters are arranged at the inlet sections of the medium-temperature screen superheater and the high-temperature screen superheater, which can accurately control the steam temperature and ensure that the screen outlet temperature does not exceed the temperature; 4) The pipeline from the medium-temperature screen superheater to the high-temperature screen superheater is from top to bottom, with good overall flexibility and small internal stress; 5) The pipeline from the high-temperature screen superheater to the steam collecting box is connected by multiple small pipes, and the internal stress of the pipeline is small; 6) The steam collecting box from the medium-temperature screen superheater to the high-temperature screen superheater and all the way to the main steam outlet is arranged in the span of the furnace water-cooled wall, and the overall structure is simple and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.
[0014] In the figure: medium temperature platen superheater inlet pipe 1, medium temperature platen superheater inlet header 2, medium temperature platen superheater 3, medium temperature platen superheater outlet header 4, medium temperature platen superheater outlet pipe 5, high temperature platen superheater inlet header 6, high temperature platen superheater 7, high temperature platen superheater outlet header 8, high temperature platen superheater outlet pipe 9, steam collecting header 10, furnace water-cooled wall 11. DETAILED DESCRIPTION
[0015] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.
[0016] Example
[0017] See also Figure 1 The two-stage screen device of the solid waste incineration circulating fluidized bed boiler in this embodiment includes a medium-temperature screen superheater inlet pipe 1, a medium-temperature screen superheater inlet header 2, a medium-temperature screen superheater 3, a medium-temperature screen superheater outlet header 4, a medium-temperature screen superheater outlet pipe 5, a high-temperature screen superheater inlet header 6, a high-temperature screen superheater 7, a high-temperature screen superheater outlet header 8, a high-temperature screen superheater outlet pipe 9, a steam collecting header 10 and a furnace water-cooled wall 11. The medium-temperature screen superheater outlet pipe 5 and the high-temperature screen superheater outlet pipe 9 are both connected to the steam collecting header 10.
[0018] In this embodiment, a medium-temperature platen superheater 3 and a high-temperature platen superheater 7 are respectively arranged in the furnace water-cooled wall 11.
[0019] In this embodiment, the warm platen superheater 3 is connected to the medium-temperature platen superheater inlet pipe 1 and the medium-temperature platen superheater outlet pipe 5, and the high-temperature platen superheater 7 is connected to the high-temperature platen superheater outlet pipe 9.
[0020] In this embodiment, the inlet of the high-temperature platen superheater 3 is connected to the medium-temperature platen superheater inlet header 2, the outlet of the medium-temperature platen superheater 3 is connected to the medium-temperature platen superheater outlet header 4, and the medium-temperature platen superheater inlet header 2 is connected to the medium-temperature platen superheater outlet header 4.
[0021] In this embodiment, the inlet of the high-temperature platen superheater 7 is connected to the high-temperature platen superheater inlet header 6, and the outlet of the high-temperature platen superheater 7 is connected to the high-temperature platen superheater outlet header 8. The high-temperature platen superheater inlet header 6 is connected to the high-temperature platen superheater outlet header 8.
[0022] In this embodiment, a primary desuperheater is arranged on the inlet pipe 1 of the temperature platen superheater, and a secondary desuperheater is arranged on the outlet pipe 5 of the medium temperature platen superheater.
[0023] In this embodiment, the warm-temperature platen superheater inlet header 2 and the medium-temperature platen superheater outlet header 4 are connected as a whole and are located on the upper outside of the furnace water-cooled wall 11; the high-temperature platen superheater inlet header 6 and the high-temperature platen superheater outlet header 8 are connected as a whole and are located on the upper outside of the furnace water-cooled wall 11.
[0024] In this embodiment, the steam flow direction in the tubes of the warm platen superheater 3 and the high-temperature platen superheater 7 is from bottom to top, which is the same as the flow direction of the high-temperature flue gas in the furnace water-cooled wall 11.
[0025] The high-temperature flue gas in the furnace water-cooled wall 11 flushes the medium-temperature screen superheater 3 and the high-temperature screen superheater 7 from bottom to top and releases heat to the steam in the screen. The superheated steam flows through the medium-temperature screen superheater 3 and the high-temperature screen superheater 7 in turn and is finally collected in the steam collecting box 10. The superheated steam then goes to the steam turbine to generate electricity and do work.
[0026] The medium-temperature platen superheater 3 and the high-temperature platen superheater 7 in this embodiment both adopt the steam flow direction of bottom-in and top-out, ensuring that the stress at the bottom elbow of the platen is not excessively concentrated and that the platen tube screen does not undergo permanent deformation when the boiler load fluctuates.
[0027] The pipes of the medium-temperature screen superheater 3 and the high-temperature screen superheater 7 in this embodiment are made of SA-213TP347H, which is effectively resistant to corrosion and wear. At the same time, refractory and wear-resistant castables are cast in the elbow section at the bottom of the screen to further prevent local wear of the pipes.
[0028] In this embodiment, water spray desuperheaters are provided on the inlet pipes of the medium-temperature platen superheater 3 and the high-temperature platen superheater 7, which can accurately control the steam temperature and ensure that the platen outlet temperature does not exceed the temperature.
[0029] The outlet pipe 5 of the medium-temperature platen superheater in this embodiment is relatively long from top to bottom, and the pipe has good flexibility and small stress; the outlet pipe 9 of the high-temperature platen superheater is connected by multiple small pipes, and the stress inside the pipe is small.
[0030] Through the above description, those skilled in the art can already implement it.
[0031] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.
Claims
1. A two-stage screen device for a solid waste incineration circulating fluidized bed boiler, comprising a medium-temperature screen superheater inlet pipe (1), a medium-temperature screen superheater outlet pipe (5), a high-temperature screen superheater outlet pipe (9), a steam collecting box (10) and a furnace water-cooled wall (11), wherein the medium-temperature screen superheater outlet pipe (5) and the high-temperature screen superheater outlet pipe (9) are both connected to the steam collecting box (10), and characterized in that: The furnace water-cooled wall (11) further comprises a medium-temperature platen superheater inlet header (2), a medium-temperature platen superheater (3), a medium-temperature platen superheater outlet header (4), a high-temperature platen superheater inlet header (6), a high-temperature platen superheater (7) and a high-temperature platen superheater outlet header (8). The medium-temperature platen superheater (3) and the high-temperature platen superheater (7) are respectively arranged in the furnace water-cooled wall (11). The medium-temperature platen superheater (3) is connected to the medium-temperature platen superheater inlet pipe (1) and the medium-temperature platen superheater outlet pipe (5). The high-temperature platen superheater (7) is connected to the high-temperature platen superheater outlet pipe ( 9); the inlet of the medium-temperature screen superheater (3) is connected to the medium-temperature screen superheater inlet header (2), the outlet of the medium-temperature screen superheater (3) is connected to the medium-temperature screen superheater outlet header (4), and the medium-temperature screen superheater inlet header (2) is connected to the medium-temperature screen superheater outlet header (4); the inlet of the high-temperature screen superheater (7) is connected to the high-temperature screen superheater inlet header (6), the outlet of the high-temperature screen superheater (7) is connected to the high-temperature screen superheater outlet header (8), and the high-temperature screen superheater inlet header (6) is connected to the high-temperature screen superheater outlet header (8).
2. The two-stage screen device for solid waste incineration circulating fluidized bed boiler according to claim 1 is characterized in that: Water spray desuperheaters are arranged on the inlet pipes of the medium-temperature platen superheater (3) and the high-temperature platen superheater (7).
3. The two-stage screen device for solid waste incineration circulating fluidized bed boiler according to claim 1 is characterized in that: The medium-temperature screen superheater inlet header (2) and the medium-temperature screen superheater outlet header (4) are connected as a whole and are located on the upper outer side of the furnace water-cooled wall (11); the high-temperature screen superheater inlet header (6) and the high-temperature screen superheater outlet header (8) are connected as a whole and are located on the upper outer side of the furnace water-cooled wall (11).
4. The two-stage screen device for solid waste incineration circulating fluidized bed boiler according to claim 1 is characterized in that: The steam flow direction in the tubes of the medium-temperature screen superheater (3) and the high-temperature screen superheater (7) is from bottom to top, which is the same as the high-temperature flue gas flow direction in the furnace water-cooled wall (11).
5. The two-stage screen device for solid waste incineration circulating fluidized bed boiler according to claim 1 or 4, characterized in that: The pipe materials of the medium-temperature screen superheater (3) and the high-temperature screen superheater (7) are both SA-213 TP347H.
6. The two-stage screen device for solid waste incineration circulating fluidized bed boiler according to claim 1 is characterized in that: A first-stage desuperheater is arranged on the inlet pipe (1) of the medium-temperature platen superheater, and a second-stage desuperheater is arranged on the outlet pipe (5) of the medium-temperature platen superheater.