Air pre-heater pipeline structure with flexible structure

Abstract

The invention provides an air pre-heater pipeline structure with a flexible structure, and belongs to the technical field of heat exchange equipment, the air pre-heater pipeline structure comprises baffles, a plurality of through holes are formed in the baffles, a plurality of air pre-heating pipes are arranged between the baffles, a metal air pre-heating pipe is arranged on the periphery of each air pre-heating pipe, a quartz air pre-heating pipe is arranged on the inner circle of each air pre-heating pipe, and flexible joints are arranged between the quartz air pre-heating pipes and the baffles. The flexible joint comprises a joint a and a joint b, the joint a is provided with an external thread and is internally provided with a gasket a, the joint b is provided with an internal thread and is internally provided with a gasket b, the internal thread and the external thread are in threaded connection to form a whole, the quartz air pre-heating pipes are connected together through the flexible joint to form communication, and the quartz air pre-heating pipes and the joint a are welded to the baffle to be fixed. Wherein the quartz air pre-heating pipe is sleeved on the gasket for buffering. The device is mainly applied to the air pre-heater.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchange equipment, and in particular relates to an air preheater pipeline structure with a flexible structure. Background Art

[0002] The existing air preheater has the following technical defects:

[0003] During the operation of the denitrification system, when the ammonia escape is large and the cold end temperature is low, ammonium bisulfate will be deposited at the cold end of the air preheater, causing blockage of the heat exchange element, and this blockage is difficult to completely resolve through conventional soot blowing or shutdown flushing.

[0004] The corrugated plate flow channel of the air preheater is narrow and easily blocked by fly ash particles in the flue gas, which reduces the heat exchange efficiency and increases the flow channel resistance. In severe cases, it can cause fan surge or even unit shutdown.

[0005] The existing sootblowing system is difficult to effectively remove deposited ammonium bisulfate or fly ash, and the sootblowing cycle is difficult to accurately determine. Excessive sootblowing will also increase energy consumption and damage the heat exchange surface.

[0006] Air leakage can be caused by factors such as the gap between the dynamic and static structures of the air preheater, the pressure difference between the flue gas side and the air side, and the thermal deformation of the rotor. Air leakage can increase the fan output and exhaust volume, cause fluctuating exhaust temperature, and aggravate low-temperature corrosion and dust accumulation at the cold end.

[0007] The air leakage rate of the rotary air preheater is relatively large, and as the operating time increases, the air leakage rate will further increase.

[0008] During low-load operation or winter conditions, the temperature at the cold end of the air preheater is relatively low, which can easily lead to low-temperature corrosion and damage to the heat exchange components.

[0009] The materials of some air preheaters have limited corrosion resistance in high temperature and corrosive environments, which affects the service life of the equipment.

[0010] Problems such as sootblower nozzle deviation, insufficient sootblowing pressure or unreasonable drainage system design will affect the sootblowing effect and cause soot accumulation.

[0011] Due to problems such as dust accumulation, corrosion and high temperature, the service life of the heat exchange elements of the air preheater is shortened and needs to be replaced frequently.

[0012] When operating at low load, variable load or when coal quality fluctuates greatly, the operating efficiency and stability of the air preheater will decrease, and blockage and corrosion problems will easily occur.

[0013] The applicant is professionally engaged in the transformation of the above-mentioned technical work. In order to solve the above-mentioned technical problems, the applicant has tried many solutions, but the results obtained were not satisfactory.

[0014] In the recent stage, the applicant has finally found a more suitable solution through unremitting efforts and improvements. The above technical problems are solved mainly by changing the pipeline structure of the preheater. Not only the production cost is lower, the maintenance cost is also lower, and the operation is more convenient. Summary of the invention

[0015] In order to solve the technical problems raised by the background technology, the present invention provides an air preheater pipeline structure with a flexible structure, and the technical solution adopted is as follows:

[0016] An air preheater pipeline structure with a flexible structure includes a baffle plate, a plurality of through holes are arranged on the baffle plate, and a plurality of air preheater pipes are arranged between the baffle plates. The material of the baffle plate is a metal material.

[0017] The core improvements of the present invention are as follows: the outer circle of the air pre-tube is a metal air pre-tube, which is fixedly connected to the baffle, and the inner circle of the air pre-tube is a quartz air pre-tube. This design reduces the production cost while not losing the heat exchange efficiency. Since the quartz air pre-tube has stronger corrosion resistance, the life of the entire air pre-tube is improved, thereby ensuring the service life of the air preheater. A flexible joint is provided between the quartz air pre-tube and the baffle, and the flexible joint is used to ensure that the connection of the quartz air pre-tube has a certain elasticity to prevent heat To solve the problem of cracking at expansion and contraction joints, the flexible joint of the present invention comprises a joint a and a joint b, the joint a is provided with an external thread and a gasket a inside, the joint b is provided with an internal thread and a gasket b inside, the internal thread and the external thread are threadedly connected to form a whole, the quartz air pre-tube is connected together through the flexible joint to form a connection, wherein the quartz air pre-tube and the joint a are welded on the baffle for fixation, wherein the quartz air pre-tube is sleeved on the gasket for buffering, the gasket a and the gasket b are made of anti-corrosion soft materials, and the effect is better when the gasket a and the gasket b are graphene gaskets.

[0018] The working principle of the present invention is as follows: through the design of the outer metal air pre-tube cooperating with the inner quartz air pre-tube, the outer metal air pre-tube can effectively protect the inner quartz air pre-tube, which reduces the cost on the one hand and improves the maintenance efficiency on the other hand.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] Through the structural transformation of the present invention, due to the design of the outer metal air pre-tube cooperating with the inner quartz air pre-tube, the maintenance cost of the whole equipment is effectively reduced. When all are quartz air pre-tubes, there is no outer air pre-tube protection, and both the cleaning process and the maintenance process are affected. When the design of the present invention is adopted, the whole maintenance and cleaning are not affected. When the special flexible joint of the present invention is not adopted, the quartz air pre-tube will expand and contract with heat and easily crack at the joint, and cannot run for a long time. When the technical scheme of the present invention is adopted, the technical problem of cracking at the joint of the quartz air pre-tube due to thermal expansion and contraction can also be avoided. Moreover, when the flexible joint of the present invention is adopted, when the quartz air pre-tube is damaged, it can be quickly replaced through the flexible joint, and the replacement is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a structural diagram of the joint a of the present invention;

[0023] Figure 3 This is a structural diagram of the joint b of the present invention;

[0024] Figure 4 It is a three-dimensional diagram of the flexible joint of the present invention;

[0025] Figure 5 It is the installation schematic diagram of the present invention.

[0026] In the figure: 1 baffle; 2 through hole; 3 quartz hollow pre-tube; 4 flexible joint; 4-1 joint a; 4-1-1 external thread; 4-2 gasket a; 4-3 joint b; 4-3-1 internal thread; 4-4 gasket b; 5 metal hollow pre-tube. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 4 As shown:

[0028] An air preheater pipeline structure with a flexible structure comprises a baffle 1, a plurality of through holes 2 are arranged on the baffle 1, and a plurality of air preheater pipes are arranged between the baffles 1, wherein the plurality of air preheater pipes are arranged between the baffles 2.

[0029] The outer circle of the empty pre-tube is a metal empty pre-tube 5, and the inner circle of the empty pre-tube is a quartz empty pre-tube. A flexible joint 4 is arranged between the quartz empty pre-tube 3 and the baffle 2, and the flexible joint 4 includes a joint a4-1 and a joint b4-3. The joint a4-1 is provided with an external thread 4-1-1 and a gasket a4-2 is arranged inside. The joint b4-3 is provided with an internal thread 4-3-1 and a gasket b4-4 is arranged inside. The internal thread 4-3-1 is threadedly connected with the external thread 4-1-1 to form a whole. The quartz empty pre-tube 3 is connected together through the flexible joint 4 to form a connection, wherein the quartz empty pre-tube 3 and the joint a4-1 are welded to the baffle for fixation, wherein the quartz empty pre-tube 3 is sleeved on the gasket for buffering, and the gasket a4-2 and the gasket b4-2 are graphene gaskets.

[0030] The method of using the present invention is as follows: the pipeline of the air preheater is designed to have an outer ring portion that is a traditional air preheater structure, namely, a metal air preheater 5, and the inner ring pipeline of the air preheater is designed to have a quartz air preheater 3 structure, and a flexible joint 4 is used to connect the quartz air preheater 3 at its connection to ensure the service life of the quartz air preheater 3, that is, the joint will not crack due to thermal expansion and contraction. When the quartz air preheater 3 is damaged and needs repair, it is only necessary to replace the damaged quartz air preheater 3 through the rotating joint b4-3, and after the replacement, the joint b4-3 and the joint a4-1 can be screwed together. The whole process is convenient and quick to operate.

Claims

1. An air preheater pipeline structure with a flexible structure, comprising a baffle (1), a plurality of through holes (2) being provided on the baffle (1), and a plurality of air preheater pipes being provided between the baffles (1), characterized in that: The outer circle of the air pre-tube is a metal air pre-tube (5), and the inner circle of the air pre-tube is a quartz air pre-tube (3). A flexible joint (4) is arranged between the quartz air pre-tube (3) and the baffle (2). The flexible joint (4) comprises a joint a (4-1) and a joint b (4-3). The joint a (4-1) is provided with an external thread (4-1-1) and a gasket a (4-2) is arranged inside. The joint b (4-3) is provided with an internal thread (4-3-1) and a gasket b (4-4) is arranged inside. The internal thread (4-3-1) and the external thread (4-1-1) are threadedly connected to form a whole. The quartz air pre-tube (3) is connected together through the flexible joint (4) to form a connection. The quartz air pre-tube (3) and the joint a (4-1) are welded to the baffle for fixing. The quartz air pre-tube (3) is sleeved on the gasket for buffering.

2. The air preheater pipeline structure with a flexible structure as claimed in claim 1, characterized in that: The gasket a (4-2) and the gasket b (4-2) are made of corrosion-resistant soft materials.

3. The air preheater pipeline structure with a flexible structure as claimed in claim 2, characterized in that: The gasket a (4-2) and the gasket b (4-2) are graphene gaskets.

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