Intelligent soot blowing energy efficiency improving system for low-temperature section of circulating fluidized bed boiler

Abstract

The utility model relates to the technical field of solid waste recovery, and discloses a circulating fluidized bed boiler low-temperature section intelligent soot blowing energy efficiency improving system which comprises a compressed air distribution cabinet and two sets of generation tanks, the top ends of the generation tanks are connected with the same first connecting pipe, an air inlet pipe is connected in the compressed air distribution cabinet, and a second connecting pipe is connected in the compressed air distribution cabinet. The other end of the air inlet pipe is connected and communicated with the first connecting pipe, and the bottom end of each generation tank is connected with a connecting pipe frame. According to the utility model, compressed air management is added to purge the outlet of the generation tank and the through-wall pipe, so that the dust accumulation at the acetylene injection port is effectively avoided, the operation cycle of an acetylene system is prolonged, the injection effect at a low-temperature section is obvious, the blockage cycle of the air pre-heater is obviously prolonged or even appears, and the dust accumulation at the injection port is also automatically purged; the problems that the acetylene soot blowing effect is poor, and soot on the heating surface is serious are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of solid waste recycling technology, specifically to an intelligent soot blowing energy efficiency improvement system for the low-temperature section of a circulating fluidized bed boiler. Background Technology

[0002] Boiler co-firing of sludge refers to the technology of mixing and burning municipal sludge (with a water content of 60-85%) with coal. It is a method of urban solid waste resource utilization and can achieve sludge reduction (volume reduction of more than 90%) and energy recovery.

[0003] Since the boiler began co-firing sludge, the acetylene soot blowing system, especially the final stage of the air preheater, has experienced ash blockage in the injection pipes. After a period of operation, the overall acetylene soot blowing effect has decreased. In addition, the increased amount of sludge co-firing has led to increased water carryover in the flue gas. Due to the lack of effective soot blowing, blockages have occurred between the tube banks in the air preheater. The acetylene soot blowing injection pipes are blocked and ash has accumulated, making cleaning difficult. As a result, the soot blowing system is operating poorly, the cycle time is shortened, the ash surface on the heated surface is increased, heat transfer is affected, and heat loss is increased.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide an intelligent soot blowing energy efficiency improvement system for the low-temperature section of a circulating fluidized bed boiler, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a compressed air distribution cabinet and a generator tank. There are two generator tanks, each connected to the same connecting pipe at its top. An air inlet pipe is connected inside the compressed air distribution cabinet, with the other end of the inlet pipe connected to the first connecting pipe. A connecting pipe bracket is connected to the bottom of each generator tank. A check valve is connected to one end of the connecting pipe bracket near the generator tank, and a through-wall pipe is connected to the other end. A backflush pipe is connected to one side of the compressed air distribution cabinet. A solenoid valve is connected to one end of the backflush pipe near the compressed air distribution cabinet, and a second connecting pipe is connected to the other end. Both ends of the second connecting pipe are connected to the two connecting pipe brackets.

[0007] Preferably, a three-way pipe is provided between the intake pipe and the connecting pipe, and a one-way valve is provided at the end near the intake pipe.

[0008] Preferably, the two through-wall pipes are a high-temperature section and a low-temperature section, and an insulation layer is provided on the surface of the through-wall pipe located in the low-temperature section.

[0009] Preferably, the connecting pipe rack and the second connecting pipe are both connected to the through-wall pipe via flanges.

[0010] Preferably, the backflush pipe is made entirely of DN stainless steel.

[0011] Preferably, vibration sensors are connected and installed inside both the generating tank and the compressed air distribution cabinet.

[0012] In summary, this application includes the following beneficial technical effects:

[0013] By adding compressed air management to purge the generator outlet and through-wall pipes, ash accumulation at the acetylene injection nozzles is effectively avoided, the acetylene system operating cycle is extended, the low-temperature section injection effect is obvious, the air preheater blockage cycle is significantly extended or even occurs, and the ash accumulation at the injection nozzles is also automatically purged, effectively solving the problems of poor acetylene soot blowing effect and serious ash accumulation on the heated surface. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the intelligent soot blowing energy efficiency improvement system for the low-temperature section of a circulating fluidized bed boiler according to this utility model;

[0015] Figure 2 This is a side view of the intelligent soot blowing energy efficiency improvement system for the low-temperature section of a circulating fluidized bed boiler, according to this utility model.

[0016] In the diagram: 1. Compressed air distribution cabinet; 2. Generator; 3. Inlet pipe; 4. Connecting pipe one; 5. One-way valve; 6. Backflush pipe; 7. Connecting pipe two; 8. Connecting pipe rack; 9. Check valve; 11. Through-wall pipe; 12. Insulation layer; 13. Solenoid valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-2This utility model provides a technical solution: it includes a compressed air distribution cabinet 1 and a generator tank 2. There are two generator tanks 2, and the top of each tank is connected to the same connecting pipe 4. An air inlet pipe 3 is connected inside the compressed air distribution cabinet 1. The other end of the air inlet pipe 3 is connected to the connecting pipe 4. A connecting pipe rack 8 is connected to the bottom of each generator tank 2. A check valve 9 is connected to one end of the connecting pipe rack 8 near the generator tank 2, and a wall-penetrating pipe 11 is connected to the other end. A backflush pipe 6 is connected to one side of the compressed air distribution cabinet 1. The backflush pipe 6 is made of DN20 stainless steel. A solenoid valve 13 is connected to one end of the backflush pipe 6 near the compressed air distribution cabinet 1, and a connecting pipe 7 is connected to the other end. Both ends of the connecting pipe 7 are connected to the two connecting pipe racks 8. A vibration sensor and a high-voltage pulse igniter are connected inside the generator tank 2. Since this is a conventional setup, it is not described in detail in the specification.

[0019] Reference Figure 1 As shown, a three-way pipe is connected between the intake pipe 3 and the connecting pipe 4, and a one-way valve 5 is connected to one end of the intake pipe 3. The other end of the three-way pipe is connected to an acetylene / oxygen supply system for injecting fuel into the generator tank 2 to facilitate subsequent deflagration operations.

[0020] Reference Figure 2 As shown, the two through-wall pipes 11 are respectively the high-temperature section and the low-temperature section. The surface of the through-wall pipe 11 located in the low-temperature section is connected to an insulation layer 12, which is made of aluminum silicate fiber insulation layer. A metal layer is wrapped around the insulation layer for protection.

[0021] Reference Figure 1 As shown, the connecting pipe rack 8 and connecting pipe 7 are all connected to the through-wall pipe 11 by flanges, which facilitates the disassembly and assembly of the pipe fittings for inspection and cleaning during boiler shutdown.

[0022] The implementation principle of this application is as follows: When the acetylene is ignited and exploded in the generator tank 2, the solenoid valve 13 is opened immediately. Compressed air is transmitted to the connecting pipe 7 through the backflush pipe 6 to purge the connecting pipe rack 8 and the through-wall pipe 11 at the outlet of the generator tank 2, ensuring the unobstructed flow of the pipeline and preventing backfire ash from adhering to the pipe wall after the explosion, thus ensuring the normal operation of the acetylene soot blowing system.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An intelligent sootblowing energy efficiency improvement system for low-temperature section of a circulating fluidized bed boiler, comprising a compressed air distribution cabinet (1) and a generating tank (2), characterized in that: The generating tank (2) has two groups, and the top end is connected with a same connecting pipe I (4), the compressed air distribution cabinet (1) is connected with an air inlet pipe (3), the other end of the air inlet pipe (3) is connected with the connecting pipe I (4) and communicates, the bottom end of the generating tank (2) is connected with a connecting pipe support (8), the one end of the connecting pipe support (8) close to the generating tank (2) is connected with a check valve (9), and the other end is connected with a wall pipe (11), one side of the compressed air distribution cabinet (1) is connected with a back blowing pipe (6), the one end of the back blowing pipe (6) close to the compressed air distribution cabinet (1) is connected with a solenoid valve (13), and the other end is connected with a connecting pipe II (7), and the two ends of the connecting pipe II (7) are connected with the two connecting pipe supports (8).

2. The circulating fluidized bed boiler low-temperature section intelligent soot-blowing energy efficiency improvement system according to claim 1, characterized in that: The air inlet pipe (3) and the connecting pipe I (4) are connected with a three-way pipe, and the one end close to the air inlet pipe (3) is connected with a check valve (5).

3. The circulating fluidized bed boiler low-temperature section intelligent soot-blowing energy efficiency improvement system according to claim 1, characterized in that: The two wall pipes (11) are high-temperature sections and low-temperature sections, and the wall pipe (11) located in the low-temperature section is connected with a heat preservation layer (12) on the surface.

4. The circulating fluidized bed boiler low-temperature section intelligent soot-blowing energy efficiency improvement system according to claim 1, characterized in that: The connecting pipe support (8), the connecting pipe II (7) and the wall pipe (11) are connected through flanges.

5. The circulating fluidized bed boiler low-temperature section intelligent soot-blowing energy efficiency improvement system according to claim 1, characterized in that: The back blowing pipe (6) is a DN20 stainless steel pipe.

6. The circulating fluidized bed boiler low-temperature section intelligent soot-blowing energy efficiency improvement system according to claim 1, characterized in that: The generating tank (2) and the compressed air distribution cabinet (1) are connected with a vibration sensor.

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