Novel fluidized bed boiler water-cooling slag tapping pipe

Abstract

The utility model relates to a novel fluidized bed boiler water cooling slag tapping pipe, and relates to the technical field of boiler slag tapping, the novel fluidized bed boiler water cooling slag tapping pipe comprises a slag tapping pipe body, the slag tapping pipe body is connected with a fluidized bed boiler, and a cooling mechanism for cooling the slag tapping pipe body is arranged on the slag tapping pipe body. According to the slag tapping pipe, water cooling is conducted on the slag tapping pipe body after water is introduced into the multiple cooling water pipes, water vapor generated after cooling is discharged through the water outlet pipe and enters the heat exchange system to be utilized, and therefore cooling work on the slag tapping pipe body is achieved, and the probability that the slag tapping pipe body is damaged due to the long-term influence of the high temperature effect is reduced; and the heat generated by the slag discharge pipe body is also utilized, so that the waste of heat energy resources is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of boiler slagging, and in particular to a novel water-cooled slagging pipe for a fluidized bed boiler. Background Art

[0002] Circulating fluidized bed boiler (CFB boiler) is a clean coal combustion technology that uses fluidized combustion. It is developed on the basis of bubbling bed boiler (fluidized bed furnace). Its main structure includes two parts: combustion chamber and circulating furnace. This technology has many advantages, such as wide fuel applicability, small environmental impact, small equipment footprint, large load adjustment range, high combustion heat intensity, strong heat transfer capacity in the furnace, and comprehensive utilization of ash and slag. However, it also has many disadvantages, including high carbon content in fly ash, high power consumption rate, severe wear of heating surface, and large heat loss in slag discharge.

[0003] There are three main ways to discharge slag from a domestic fluidized bed boiler: bottom discharge, side wall discharge, and back-of-furnace discharge. At present, the main method used for domestic 300MW fluidized bed boilers is back-of-furnace discharge, that is, the slag discharge pipeline or equipment is arranged at the back of the boiler, and the lower slag pipe is installed at the back of the boiler furnace air distribution plate, and then it is cooled by the slag cooler and discharged into the slag conveying system, and finally stored in the slag bin.

[0004] There are many types of slag pipes for boiler slag discharge, the most common of which is the light tube type. However, this method will cause the slag pipe to be in a red-hot state for a long time during boiler operation, and the slag pipe is easily damaged under long-term high temperature operation, resulting in a short service life (usually one year), a safety hazard, and a large heat loss of the boiler slag, which wastes a lot of thermal energy resources. Utility Model Content

[0005] In order to reduce the probability of the slag pipe being damaged due to long-term high temperature, the present application provides a new type of water-cooled slag pipe for a fluidized bed boiler.

[0006] The present application provides a novel fluidized bed boiler water-cooled slag pipe, which adopts the following technical solution:

[0007] A novel water-cooled slag pipe for a fluidized bed boiler comprises a slag pipe body, the slag pipe body is connected to the fluidized bed boiler, a cooling mechanism for cooling the slag pipe body is arranged on the slag pipe body, and the cooling mechanism comprises:

[0008] A cooling water pipe, wherein a plurality of cooling water pipes are provided, and the plurality of cooling water pipes are evenly distributed on the outer side wall of the lower slag pipe body;

[0009] A water inlet pipe, one end of which is connected to a water source, and the other end of which is connected to a cooling water pipe and is connected to the interior of the cooling water pipe;

[0010] A connecting pipe, the connecting pipe is arranged between two adjacent cooling water pipes, and both ends of the connecting pipe are connected to the two adjacent cooling water pipes;

[0011] A water outlet pipe, the water outlet pipe is arranged on the cooling water pipe and communicated with the interior of the cooling water pipe;

[0012] The heat exchange system is connected to the water outlet pipe, and the heat exchange system utilizes the heat in the hot water derived from the water outlet pipe.

[0013] By adopting the above technical scheme, cold water enters into the cooling water pipe through the water inlet pipe, and a plurality of cooling water pipes evenly distributed on the lower slag pipe body are connected through the connecting pipe. After water passes through the plurality of cooling water pipes, the lower slag pipe body is water-cooled, and the water vapor generated after cooling is discharged through the water outlet pipe and enters into the heat exchange system for utilization, thereby realizing the cooling of the lower slag pipe body, reducing the probability of the lower slag pipe body being damaged by long-term high temperature, and also utilizing the heat generated by the lower slag pipe body, thereby reducing the waste of thermal energy resources.

[0014] Optionally, the slag lowering pipe body is made of SUS310S seamless steel pipe, and the cooling water pipe is a semicircular pipe with curvature at both ends pressed from 20g steel plate.

[0015] By adopting the above technical scheme, the slag lowering pipe body adopts SUS310S pipe, which has excellent oxidation resistance, corrosion resistance, good multi-creep strength, can be used continuously at high temperature, has high high temperature resistance, and its maximum working temperature can reach 1300°C, and the continuous use temperature can reach 1150°C, and has strong wear resistance; and a semicircular pipe with arcs at both ends is used to connect with the cooling water pipe. The semicircular manner increases the direct contact area between the water body and the slag lowering pipe body, thereby improving the cooling effect.

[0016] Optionally, the heat exchange system comprises:

[0017] A steam turbine, the steam turbine being connected to the water outlet pipe, the steam turbine utilizing the hot steam derived from the water outlet pipe to generate electricity;

[0018] A condenser, the condenser is connected to the steam turbine, and the condenser is used to condense the steam exhausted by the steam turbine into water;

[0019] A condensate pump is connected to the condenser and the water inlet pipe, and is used to discharge the cold water in the condenser into the water inlet pipe.

[0020] By adopting the above technical scheme, the hot steam in the water outlet pipe enters the steam turbine, and the steam turbine uses the hot steam discharged from the water outlet pipe to work and generate electricity, thereby realizing the utilization of thermal energy resources. The steam used by the steam turbine enters the condenser and condenses into water, and then is guided back to the water inlet pipe through the condensate pump, thereby realizing the recycling of water resources and reducing the waste of water resources.

[0021] Optionally, a crushing mechanism for crushing the slag is provided on the lower slag pipe body, and the crushing mechanism includes:

[0022] A crushing plate, wherein the crushing plate is arranged on the inner wall of the lower slag pipe body;

[0023] The crushing spikes are provided in plurality and the plurality of crushing spikes are evenly distributed on the surface of the crushing plate.

[0024] By adopting the above technical scheme, a crushing plate is installed on the inner wall of the lower slag pipe body, and crushing spikes are evenly installed on the crushing plate. When the slag generated in the fluidized bed boiler enters the lower slag pipe body, large particles of slag collide with the crushing spikes and break into small particles of slag, thereby reducing the probability of large particles of slag blocking the lower slag pipe body and ensuring the working effect of the lower slag pipe body.

[0025] Optionally, the crushing plate is rotated and arranged on the inner wall of the lower slag pipe body, a spring is arranged on the inner wall of the lower slag pipe body, the spring is connected to the crushing plate, and the crushing plate is compressed and moved after being impacted by the slag.

[0026] By adopting the above technical scheme, when the slag falls into the lower slag pipe, the slag falls onto the crushing spikes. Under the action of gravity, the slag is broken by the crushing spikes and the crushing plate rotates downward, and the broken slag falls from the crushing plate. After the slag falls, the crushing plate returns to its original position under the action of the spring force, thereby reducing the probability of slag accumulating on the crushing plate. The crushing plate repeatedly swings through the spring force, thereby improving the crushing effect of the crushing spikes on the slag.

[0027] Optionally, the slag lower pipe body includes an outer pipe body and a heat-resistant lining. The heat-resistant lining is arranged inside the outer pipe body. An insulating gap is left between the outer pipe body and the heat-resistant lining. The heat-resistant lining is a heat-resistant lining made of a ceramic composite material.

[0028] By adopting the above technical scheme, the slag pipe body is divided into two parts, namely an outer pipe body and a heat-resistant lining. The heat-resistant lining is a heat-resistant lining made of a ceramic composite material, and an insulating gap is left between the outer pipe body and the heat-resistant lining, thereby improving the overall heat resistance of the slag pipe body and reducing the probability of damage to the slag pipe body in a long-term high temperature environment.

[0029] Optionally, the outer side wall of the outer tube body is provided with lifting ears, and two pairs of the lifting ears are provided in a pair, and the two pairs of the lifting ears are respectively located at two ends of the outer tube body.

[0030] By adopting the above technical solution, the lifting lugs are fixedly connected to the outer pipe body, so that the slag lowering pipe body can be installed and transported through the lifting lugs, thereby improving the convenience of the slag lowering pipe body during installation and transportation.

[0031] Optionally, both ends of the lower slag pipe body are provided with shock absorbing rings, and the lower slag pipe body is connected to the fluidized bed boiler via the shock absorbing rings.

[0032] By adopting the above technical solution, shock-absorbing rings are installed at both ends of the lower slag pipe body. The shock-absorbing rings buffer the vibration generated by the lower slag pipe body at the connection between the lower slag pipe body and other equipment, thereby reducing the probability of the lower slag pipe body breaking at the connection with other equipment due to vibration, and improving the service life of the lower slag pipe body.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. The lower slag pipe body is cooled by water after water is passed through multiple cooling water pipes. The water vapor generated after cooling is discharged through the water outlet pipe and enters the heat exchange system for utilization, thereby realizing the cooling of the lower slag pipe body, reducing the probability of the lower slag pipe body being damaged by long-term high temperature, and also utilizing the heat generated by the lower slag pipe body, reducing the waste of thermal energy resources;

[0035] 2. By installing a crushing plate on the inner side wall of the slag lowering pipe body, crushing spikes are evenly installed on the crushing plate. When the slag generated in the fluidized bed boiler enters the slag lowering pipe body, large particles of slag collide with the crushing spikes and break into small particles of slag, thereby reducing the probability of large particles of slag blocking the slag lowering pipe body and ensuring the working effect of the slag lowering pipe body;

[0036] 3. By dividing the slag pipe body into two parts, namely an outer pipe body and a heat-resistant lining, the heat-resistant lining is a heat-resistant lining made of a ceramic composite material, and an insulating gap is left between the outer pipe body and the heat-resistant lining, thereby improving the overall heat resistance of the slag pipe body and reducing the probability of damage to the slag pipe body in a long-term high temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional structural schematic diagram of the present application;

[0038] Figure 2 It is a schematic diagram of the structure of the cooling mechanism and the crushing mechanism in the present application, in which the side wall of the lower slag pipe body is cut away.

[0039] Figure numerals: 1. slag pipe body; 11. outer pipe body; 12. heat-resistant lining; 13. lifting ear; 14. shock-absorbing ring; 2. cooling mechanism; 21. cooling water pipe; 22. water inlet pipe; 23. connecting pipe; 24. water outlet pipe; 25. heat exchange system; 26. steam turbine; 27. condenser; 28. condensate pump; 3. crushing mechanism; 31. crushing plate; 32. crushing spikes; 33. spring. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1 -Attached Figure 2 This application is described in further detail.

[0041] The embodiment of the present application discloses a novel water-cooled slag lower pipe for a fluidized bed boiler.

[0042] Reference Figure 1 The novel fluidized bed boiler water-cooled slag pipe comprises a slag pipe body 1 connected to the fluidized bed boiler, and a cooling mechanism 2 for cooling the slag pipe body 1 is arranged on the slag pipe body 1.

[0043] Reference Figure 1 and Figure 2 The cooling mechanism 2 includes a cooling water pipe 21, a water inlet pipe 22, a connecting pipe 23, a water outlet pipe 24 and a heat exchange system 25. The cooling water pipe 21 is a semicircular pipe with arcs at both ends, which is made of 20g steel plate. There are multiple cooling water pipes 21, and the multiple cooling water pipes 21 are evenly installed on the outer wall of the lower slag pipe body 1. Two adjacent cooling water pipes 21 are connected and communicated with each other through a connecting pipe 23. The water inlet pipe 22 and the water outlet pipe 24 are respectively fixedly connected to the two adjacent cooling water pipes 21 and communicated with the inside of the cooling water pipe 21.

[0044] Reference Figure 1 and Figure 2 Cold water enters the cooling water pipe 21 through the water inlet pipe 22, and multiple cooling water pipes 21 evenly distributed on the lower slag pipe body 1 are connected through the connecting pipe 23. After water passes through the multiple cooling water pipes 21, the lower slag pipe body 1 is water-cooled, thereby realizing the cooling of the lower slag pipe body 1.

[0045] Reference Figure 1 and Figure 2, the heat exchange system 25 is used to utilize the hot steam exported from the outlet pipe 24. The heat exchange system 25 includes a steam turbine 26, a condenser 27 and a condensate pump 28. The steam turbine 26 is fixedly connected and communicated with the outlet pipe 24. After the water in the cooling water pipe 21 is heated and evaporated, it enters the steam turbine 26 through the outlet pipe 24, and the steam turbine 26 uses the hot steam to generate electricity. The condenser 27 is connected to the steam turbine 26, and the steam used by the steam turbine 26 enters the condenser 27 and condenses into water. The condensate pump 28 is connected to the condenser 27 and the water inlet pipe 22, and the condensate pump 28 discharges the cold water in the condenser 27 into the water inlet pipe 22. Thereby, while realizing the utilization of thermal energy resources, water resources are also reused, reducing resource waste.

[0046] Reference Figure 1 and Figure 2 The slag lowering pipe body 1 includes an outer pipe body 11 and a heat-resistant inner lining 12. The heat-resistant inner lining 12 is located inside the outer pipe body 11, and a heat-insulating gap is left between the outer pipe body 11 and the heat-resistant inner lining 12. The outer pipe body 11 is made of a SUS310S seamless steel pipe. The heat-resistant inner lining 12 is made of a ceramic composite material.

[0047] Reference Figure 1 and Figure 2 The outer wall of the outer tube body 11 is fixedly connected with a lifting lug 13. The lifting lugs 13 are arranged in pairs of two, and the two pairs of lifting lugs 13 are respectively located at the two ends of the outer tube body 11. The two ends of the outer tube body 11 are fixedly connected with a shock absorbing ring 14.

[0048] Reference Figure 1 and Figure 2 A crushing mechanism 3 for crushing slag is provided on the inner wall of the heat-resistant lining 12, and the crushing mechanism 3 includes a crushing plate 31 and crushing spikes 32. The crushing plate 31 is rotatably mounted on the inner wall of the heat-resistant lining 12. A plurality of crushing spikes 32 are provided, and the plurality of crushing spikes 32 are evenly distributed and fixed on the surface of the crushing plate 31. A spring 33 is fixedly connected to the inner wall of the heat-resistant lining 12, and the spring 33 is fixedly connected to the bottom surface of the crushing plate 31.

[0049] Reference Figure 1 and Figure 2 When the slag falls into the lower slag pipe, the slag falls onto the crushing spikes 32. Under the action of gravity, the slag is broken by the crushing spikes 32 and the crushing plate 31 rotates downward, and the broken slag falls from the crushing plate 31. After the slag falls, the crushing plate 31 returns to its original position under the action of the elastic force of the spring 33, thereby reducing the probability of large particles of slag blocking the lower slag pipe body 1 and ensuring the working effect of the lower slag pipe body 1.

[0050] The working principle of the embodiment of the present application is as follows:

[0051] Cold water enters the cooling water pipe 21 through the water inlet pipe 22, and multiple cooling water pipes 21 evenly distributed on the lower slag pipe body 1 are connected through the connecting pipe 23. After water passes through the multiple cooling water pipes 21, the lower slag pipe body 1 is water-cooled, and the water vapor generated after cooling is discharged through the water outlet pipe 24 and enters the heat exchange system 25 for utilization, thereby realizing the cooling of the lower slag pipe body 1, reducing the probability of the lower slag pipe body 1 being damaged by long-term high temperature, and also utilizing the heat generated by the lower slag pipe body 1, reducing the waste of thermal energy resources.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A new type of water-cooled slag pipe for fluidized bed boiler, characterized by: The invention comprises a lower slag pipe body (1), wherein the lower slag pipe body (1) is connected to a fluidized bed boiler, and a cooling mechanism (2) for cooling the lower slag pipe body (1) is arranged on the lower slag pipe body (1), wherein the cooling mechanism (2) comprises: A cooling water pipe (21), wherein a plurality of the cooling water pipes (21) are provided, and the plurality of cooling water pipes (21) are evenly distributed on the outer side wall of the lower slag pipe body (1); A water inlet pipe (22), one end of the water inlet pipe (22) being in communication with a water source, and the other end of the water inlet pipe (22) being connected to the cooling water pipe (21) and in communication with the interior of the cooling water pipe (21); A connecting pipe (23), the connecting pipe (23) being arranged between two adjacent cooling water pipes (21), and both ends of the connecting pipe (23) being in communication with the two adjacent cooling water pipes (21); a water outlet pipe (24), the water outlet pipe (24) being arranged on the cooling water pipe (21) and being in communication with the interior of the cooling water pipe (21); A heat exchange system (25), wherein the heat exchange system (25) is connected to the water outlet pipe (24), and the heat exchange system (25) utilizes the hot steam discharged from the water outlet pipe (24).

2. A novel water-cooled slag lower pipe for fluidized bed boiler according to claim 1, characterized in that: The slag lowering pipe body (1) is a slag lowering pipe body (1) made of a SUS310S seamless steel pipe, and the cooling water pipe (21) is a semicircular pipe with curved ends made of a 20g steel plate.

3. The novel water-cooled slag lower pipe for fluidized bed boiler according to claim 1 is characterized in that: The heat exchange system (25) comprises: A steam turbine (26), the steam turbine (26) being connected to the water outlet pipe (24), the steam turbine (26) generating electricity by utilizing hot steam discharged from the water outlet pipe (24); a condenser (27), the condenser (27) being connected to the steam turbine (26), the condenser (27) being used to condense steam exhausted from the steam turbine (26) into water; A condensate pump (28), the condensate pump (28) being connected to both the condenser (27) and the water inlet pipe (22), the condensate pump (28) being used to discharge cold water in the condenser (27) into the water inlet pipe (22).

4. The novel water-cooled slag lower pipe for fluidized bed boiler according to claim 1 is characterized in that: The lower slag pipe body (1) is provided with a crushing mechanism (3) for crushing slag, and the crushing mechanism (3) comprises: A crushing plate (31), wherein the crushing plate (31) is arranged on the inner wall of the lower slag pipe body (1); A crushing spike (32), wherein a plurality of the crushing spikes (32) are provided, and the plurality of the crushing spikes (32) are evenly distributed on the surface of the crushing plate (31).

5. The novel water-cooled slag lower pipe for fluidized bed boiler according to claim 4 is characterized in that: The crushing plate (31) is rotatably arranged on the inner wall of the lower slag pipe body (1), a spring (33) is arranged on the inner wall of the lower slag pipe body (1), the spring (33) is connected to the crushing plate (31), and the crushing plate (31) is compressed by the spring (33) and moves after being impacted by the slag.

6. The novel water-cooled slag lower pipe for fluidized bed boiler according to claim 5 is characterized by: The slag lowering pipe body (1) comprises an outer pipe body (11) and a heat-resistant inner lining (12); the heat-resistant inner lining (12) is arranged inside the outer pipe body (11); a heat-insulating gap is provided between the outer pipe body (11) and the heat-resistant inner lining (12); and the heat-resistant inner lining (12) is a heat-resistant inner lining (12) made of a ceramic composite material.

7. The novel water-cooled slag lower pipe for fluidized bed boiler according to claim 6 is characterized by: The outer wall of the outer tube body (11) is provided with a lifting lug (13), and two pairs of the lifting lugs (13) are provided, with two of them forming a pair. The two pairs of the lifting lugs (13) are respectively located at two ends of the outer tube body (11).

8. The novel water-cooled slag lower pipe for fluidized bed boiler according to claim 1 is characterized by: Both ends of the lower slag pipe body (1) are provided with shock absorbing rings (14), and the lower slag pipe body (1) is connected to the fluidized bed boiler via the shock absorbing rings (14).

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