Boiler flue gas waste heat heating equipment

Abstract

The utility model discloses boiler flue gas waste heat heating equipment, which belongs to the technical field of boiler flue gas and comprises a boiler flue gas heating cylinder, a filter screen drum used for filtering dust particles in flue gas is arranged in an inner cavity of the boiler flue gas heating cylinder, and a cooling structure used for cooling heat is arranged above the filter screen drum. The cooling structure comprises a cooling cavity and a cooling hollow ring, the cooling cavity is located in a shell of the filter screen drum and used for containing cooling liquid, the cooling hollow ring is located above the filter screen drum, a top cover ring is arranged above the cooling cavity and located on the top face of the filter screen drum, and an inverted L-shaped cooling liquid pipe penetrates through the top face of the top cover ring. The cooling hollow ring is fixedly connected with the top cover ring and communicates with the L-shaped cooling liquid pipe through a communicating pipe. According to the boiler flue gas waste heat heat supply equipment, the filter screen piece and the filter screen drum can be cooled, so that the boiler flue gas heat supply drum is cooled, and the working efficiency of the boiler flue gas waste heat heat supply equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler flue gas, in particular to a boiler flue gas waste heat heating device. Background Art

[0002] The two main losses of thermal power plants are cold source loss and exhaust heat loss. Cold source loss directly affects the cycle thermal efficiency. For ordinary generator sets, cold source loss is determined by the design parameters of the unit. Exhaust heat loss is the largest of all heat losses in power plant boilers. The exhaust heat loss of modern power plant boilers is generally about 4% to 8%. An important factor affecting exhaust heat loss is the exhaust temperature.

[0003] According to statistics, in thermal power plants, the heat loss of boiler flue gas accounts for 60% to 70% of the total heat loss of the boiler. For every 10°C increase in flue gas temperature, the boiler efficiency decreases by 0.6 to 1.0%, and the standard coal consumption increases by 1.2 to 2.4 g / (kW·h), resulting in a huge waste of coal for power generation. At present, excessively high flue gas temperature has become one of the main reasons affecting boiler efficiency. In order to reduce low-temperature corrosion, the flue gas temperature of the boiler is generally designed to be 130 to 150°C, but often due to the influence of flue gas temperature, the actual operating flue gas temperature is more than 20°C higher than the design value. Therefore, lowering the flue gas temperature is of great practical significance for saving fuel, improving unit efficiency, and reducing pollution.

[0004] However, the structures for filtering and dust removal of flue gas in the current boiler flue gas waste heat heating equipment generally lack cooling structures, which easily leads to a gradual increase in the temperature of the structure and reduces the working efficiency of the flue gas waste heat heating equipment. Summary of the invention

[0005] The utility model aims to provide a boiler flue gas waste heat heating device to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a boiler flue gas waste heat heating device, comprising a boiler flue gas heating cylinder, a detachable top cover is installed on the top of the boiler flue gas heating cylinder, a smoke exhaust pipe is provided on the top surface of the detachable top cover, a filter screen cylinder for filtering dust particles in the flue gas is provided in the inner cavity of the boiler flue gas heating cylinder, a filter mesh is provided inside the filter screen cylinder, a cooling structure for heating cooling is provided above the filter screen cylinder, the cooling structure comprises a cooling chamber for containing coolant inside the shell of the filter screen cylinder and a cooling hollow ring located above the filter screen cylinder, a top cover ring is provided above the cooling chamber and on the top surface of the filter screen cylinder, an inverted L cooling liquid pipe is penetrated on the top surface of the top cover ring, the cooling hollow ring is fixedly connected to the top cover ring, and the cooling hollow ring is connected to the L cooling liquid pipe through a connecting pipe.

[0007] Preferably, a smoke filter is installed in the inner cavity of the smoke exhaust pipe, and a handle is symmetrically installed on the top surface of the detachable top cover.

[0008] Preferably, a fixing collar is welded at the center of the inner wall of the detachable top cover, and a negative pressure exhaust fan is threadedly connected in the inner cavity of the fixing collar.

[0009] Preferably, two connecting support blocks are symmetrically welded to the peripheral outer wall of the cooling hollow ring, and the two connecting support blocks are both welded to the top cover ring, and the top cover ring is threadedly connected to the filter screen cylinder.

[0010] Preferably, one end of the L-shaped coolant pipe away from the top cover ring extends through and to the outside of the boiler flue gas heating cylinder.

[0011] Preferably, valves are provided on the circumference of adjacent ends of the L coolant pipe and the connecting pipe.

[0012] Preferably, the inner wall of the fixing ring is provided with an internal thread path, and the outer wall of the shell of the negative pressure exhaust fan is provided with an external thread path.

[0013] Preferably, the detachable top cover is connected to the boiler flue gas heating cylinder by bolts, and an air inlet pipe penetrates the lower part of the peripheral outer wall of the boiler flue gas heating cylinder.

[0014] Compared with the prior art, the technical effects and advantages of the utility model are as follows: in the boiler flue gas waste heat heating equipment, the boiler flue gas rises in the boiler flue gas heating cylinder, and can filter the dust particles in the flue gas through the filter mesh of the filter screen cylinder, and at the same time, during the entire flue gas filtration, the waste heat will heat the filter screen cylinder, resulting in a high temperature of the filter screen cylinder, and the cooling chamber in the cooling structure contains coolant, so that the filter screen cylinder can be cooled, and in addition, the cooling hollow ring above the filter screen cylinder containing coolant cools the filter mesh and the filter screen cylinder, so that the filter mesh and the filter screen cylinder can be cooled, so that the boiler flue gas heating cylinder is cooled, thereby improving the working efficiency of the boiler flue gas waste heat heating equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the cooling structure of the utility model in the installation state in the boiler flue gas heating cylinder;

[0018] Figure 3 This is a schematic diagram of the connection state of the filter screen cylinder and the cooling hollow ring of the utility model;

[0019] Figure 4 It is a schematic structural diagram of the disassembled state of the fixed collar and the negative pressure exhaust fan of the utility model.

[0020] Figure numerals: 1. boiler flue gas heating cylinder; 2. detachable top cover; 3. exhaust pipe; 4. flue gas filter; 5. handle; 6. air inlet pipe; 7. L coolant pipe; 8. filter screen cylinder; 9. cooling structure; 10. top cover ring; 11. filter mesh; 12. cooling hollow ring; 13. connecting support block; 14. connecting pipe; 15. valve; 16. fixed sleeve; 17. negative pressure exhaust fan; 18. internal thread; 19. external thread. DETAILED DESCRIPTION

[0021] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0022] Unless otherwise defined, the directions of up, down, left, right, front, back, inside and outside involved in this document are based on the directions of up, down, left, right, front, back, inside and outside in the figures shown in the present utility model, and are explained here together.

[0023] This embodiment discloses Figures 1 to 4 A boiler flue gas waste heat heating device shown in the figure includes a boiler flue gas heating cylinder 1, a removable top cover 2 is installed on the top of the boiler flue gas heating cylinder 1, and a smoke exhaust pipe 3 is provided on the top surface of the removable top cover 2. The removable top cover 2 is connected to the boiler flue gas heating cylinder 1 by bolts, and an air intake pipe 6 passes through the lower part of the peripheral outer wall of the boiler flue gas heating cylinder 1. A valve is provided in the air intake pipe 6 to control the opening and closing of the air intake pipe 6. A smoke filter 4 is installed in the inner cavity of the smoke exhaust pipe 3, and the smoke filter 4 performs the final filtration on the exhausted smoke. Handles 5 are symmetrically installed on the top surface of the removable top cover 2, and the two handles 5 are convenient for taking the removable top cover 2.

[0024] A fixing ring 16 is welded at the center of the inner wall of the removable top cover 2, and a negative pressure exhaust fan 17 is threadedly connected in the inner cavity of the fixing ring 16. The inner wall of the fixing ring 16 is provided with an internal thread path 18, and the outer wall of the shell of the negative pressure exhaust fan 17 is provided with an external thread path 19. When the internal thread path 18 and the external thread path 19 are used together, the negative pressure exhaust fan 17 and the fixing ring 16 can be installed and disassembled.

[0025] A filter screen 8 for filtering dust particles in the flue gas is provided in the inner cavity of the boiler flue gas heating cylinder 1. The filter screen 8 is installed on the inner wall of the boiler flue gas heating cylinder 1 by bolts. A filter mesh 11 is provided inside the filter screen 8. The filter mesh 11 performs preliminary filtration on the flue gas and filters the dust particles in the flue gas. A cooling structure 9 for heating cooling is provided above the filter screen 8. The cooling structure 9 includes a cooling chamber for containing coolant inside the shell of the filter screen 8 and a cooling hollow ring 12 located above the filter screen 8. The coolant is input into the cooling chamber through the L cooling liquid pipe 7, the external cooling liquid source and the external pump body, so that the coolant in the cooling chamber cools the filter screen 8.

[0026] A top cover ring 10 is provided above the cooling chamber and on the top surface of the filter screen cylinder 8. An inverted L-cooling liquid pipe 7 penetrates the top surface of the top cover ring 10. A cooling hollow ring 12 is fixedly connected to the top cover ring 10. The cooling hollow ring 12 is connected to the L-cooling liquid pipe 7 through a connecting pipe 14. The cooling liquid passing through the L-cooling liquid pipe 7 is input into the connecting pipe 14, and then the filter screen cylinder 8 and the filter mesh 11 are cooled in the connecting pipe 14.

[0027] Two connecting support blocks 13 are symmetrically welded to the outer wall of the peripheral side of the cooling hollow ring 12, and the two connecting support blocks 13 are welded to the top cover ring 10. The top cover ring 10 is threadedly connected to the filter screen cylinder 8. The end of the L cooling liquid pipe 7 away from the top cover ring 10 extends through to the outside of the boiler flue gas heating cylinder 1. The L cooling liquid pipe 7 and the connecting pipe 14 are both provided with valves 15 on the peripheral side of the adjacent end. The valve 15 is used to control the input direction of the cooling liquid.

[0028] A PLC for controlling the opening and closing of the negative pressure exhaust fan 17 and the external pump body is installed on the outer wall of the boiler flue gas heating cylinder 1. The PLC model can be selected according to actual needs. In the utility model, the PLC model is S7-200, which has the advantages of high reliability, strong anti-interference ability and easy maintenance.

[0029] Working principle: In the boiler flue gas waste heat heating equipment, the boiler flue gas enters the boiler flue gas heating cylinder 1 from the air inlet pipe 6, the filter mesh 11 performs preliminary filtration on the flue gas, and filters the dust particles in the flue gas. The coolant is input into the cooling chamber through the L cooling liquid pipe 7 and the external cooling liquid source and the external pump body, so that the coolant in the cooling chamber cools the filter screen cylinder 8. The coolant passing through the L cooling liquid pipe 7 is input into the connecting pipe 14, and then the filter screen cylinder 8 and the filter mesh 11 are cooled and cooled in the connecting pipe 14.

[0030] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler flue gas waste heat heating device, comprising a boiler flue gas heating cylinder (1), characterized in that: A detachable top cover (2) is installed at the top of the boiler flue gas heating cylinder (1), and a smoke exhaust pipe (3) is provided on the top surface of the detachable top cover (2). A filter screen (8) for filtering dust particles in the flue gas is provided in the inner cavity of the boiler flue gas heating cylinder (1), and a filter mesh (11) is provided inside the filter screen (8). A cooling structure (9) for heating cooling is provided above the filter screen (8), and the cooling structure (9) includes a cooling chamber for containing coolant inside the shell of the filter screen (8) and a cooling hollow ring (12) located above the filter screen (8). A top cover ring (10) is provided above the cooling chamber and on the top surface of the filter screen (8), and an inverted L cooling liquid pipe (7) is penetrated through the top surface of the top cover ring (10). The cooling hollow ring (12) is fixedly connected to the top cover ring (10), and the cooling hollow ring (12) is connected to the L cooling liquid pipe (7) through a connecting pipe (14).

2. The boiler flue gas waste heat heating equipment according to claim 1, characterized in that: A smoke filter (4) is installed in the inner cavity of the smoke exhaust pipe (3), and a handle (5) is symmetrically installed on the top surface of the detachable top cover (2).

3. The boiler flue gas waste heat heating equipment according to claim 2, characterized in that: A fixing collar (16) is welded at the center of the inner wall of the detachable top cover (2), and a negative pressure exhaust fan (17) is threadedly connected in the inner cavity of the fixing collar (16).

4. The boiler flue gas waste heat heating equipment according to claim 3 is characterized in that: Two connecting support blocks (13) are symmetrically welded to the peripheral outer wall of the cooling hollow ring (12); the two connecting support blocks (13) are both welded to the top cover ring (10); and the top cover ring (10) is threadedly connected to the filter screen cylinder (8).

5. The boiler flue gas waste heat heating equipment according to claim 4, characterized in that: One end of the L-shaped cooling liquid pipe (7) away from the top cover ring (10) extends through and to the outside of the boiler flue gas heating cylinder (1).

6. The boiler flue gas waste heat heating equipment according to claim 5, characterized in that: Valves (15) are provided on the circumferential sides of adjacent ends of the L cooling liquid pipe (7) and the connecting pipe (14).

7. The boiler flue gas waste heat heating equipment according to claim 3, characterized in that: The inner wall of the fixed collar (16) is provided with an internal thread path (18), and the outer wall of the shell of the negative pressure exhaust fan (17) is provided with an external thread path (19).

8. The boiler flue gas waste heat heating equipment according to claim 1, characterized in that: The detachable top cover (2) is connected to the boiler flue gas heating cylinder (1) by means of bolts, and an air inlet pipe (6) penetrates the lower part of the peripheral outer wall of the boiler flue gas heating cylinder (1).

Images