Boiler SCR flue and reactor

Abstract

The invention discloses a boiler SCR flue and reactor, the boiler SCR flue comprises an SCR inlet flue and an SCR reactor, the SCR inlet flue comprises an inlet flue rear wall, the SCR reactor comprises a reactor front wall, and the reactor front wall and the inlet flue rear wall are combined into a guard plate. The system has the beneficial effects that the SCR inlet flue and the SCR reactor are integrally designed to realize higher structural stability and equipment integrity, the butt joint interface and range of the SCR equipment and the boiler flue are simpler, and the strength of the joint can be improved by combining the front wall of the SCR reactor and the rear wall of the SCR inlet flue into one protective plate, so that the durability and reliability of the system are improved, and the service life of the system is prolonged. According to the common wall structure, a connecting straight section between the SCR inlet flue and the SCR reactor can be omitted, the problem of dust accumulation of the straight section under the working condition of low load and low flue gas flow speed is avoided, the overall occupied area of the SCR inlet flue and the SCR reactor can be reduced by reducing the connecting straight section, a boiler frame is shortened by about two meters, and the weight of a boiler steel structure is reduced.

Description

Technical Field

[0001] The invention relates to the field of environmental protection treatment of boiler flue gas, and in particular to a boiler SCR flue and reactor. Background Art

[0002] Chinese patent document CN106621739A discloses a method for removing nitrogen oxides from flue gas by regenerating a spent acid cracking device. The flue gas enters the SCR selective catalytic reduction reactor through the SCR flue, and uses a reducing agent (such as NH3, ammonia water) and a catalyst to selectively react with NOx in the flue gas to generate non-toxic and non-polluting N2 and H2O, which enter the purification section along with the SO2 flue gas.

[0003] However, it can be seen from the abstract drawings of the above patent and the prior art that the SCR inlet flue and the SCR reactor are supported on the boiler frame respectively, and the weight of this part increases the number of boiler steel structure columns and the weight of the boiler frame, and the transition section between the SCR inlet flue and the SCR reactor is a horizontal straight section, which is easy to accumulate dust in the straight section under low-load flue gas flow rate conditions. At the same time, due to different fixing points, the expansion amount on both sides is quite different, and a non-metallic expansion joint needs to be installed at the interface to absorb the expansion amount. At the same time, the transition section between the SCR inlet flue and the SCR reactor is a horizontal straight section, which is easy to accumulate dust in the straight section under low-load flue gas flow rate conditions. Summary of the invention

[0004] The purpose of the present invention is to provide a boiler SCR flue and reactor to solve the above-mentioned technical problems of increased boiler length and number of columns, the need to install a non-metallic expansion joint at the interface, and easy dust accumulation in the straight section of the interface under low load conditions.

[0005] In order to solve the above technical problems, the present invention provides a boiler SCR flue and reactor, which includes an SCR inlet flue and an SCR reactor, the SCR inlet flue includes an inlet flue rear wall, the SCR reactor includes a reactor front wall, and the reactor front wall and the inlet flue rear wall are combined into a protective plate.

[0006] Furthermore, the SCR inlet flue is integrally formed, and the SCR inlet flue comprises a bent section and a vertical section, the front section of the SCR inlet flue is the bent section, and the rear section of the SCR inlet flue is the vertical section.

[0007] Furthermore, a transition section is provided between the SCR inlet flue and the SCR reactor, one end of the transition section is connected to the vertical section, and the other end of the transition section is connected to the SCR reactor.

[0008] Furthermore, the guard plate includes reinforcing ribs and a steel plate, a plurality of the reinforcing ribs form a frame, and the steel plate is fixedly connected to the reinforcing ribs.

[0009] Furthermore, a supporting device is provided below the SCR reactor.

[0010] Furthermore, the transition section is in the shape of a right-angled trapezoid.

[0011] The beneficial effects of the present invention are as follows: compared with the prior art, a boiler SCR flue and reactor include an SCR inlet flue and an SCR reactor, the SCR inlet flue includes an inlet flue front wall, the SCR reactor includes an inlet flue rear wall, the reactor front wall and the inlet flue rear wall are combined into a protective plate, and the SCR inlet flue and the SCR reactor achieve higher structural integrity and stability through an integrated design. By combining the SCR reactor front wall and the SCR inlet flue rear wall into a protective plate, the footprint and the weak points at the connection can be reduced, thereby improving the material utilization, durability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the boiler SCR flue and reactor.

[0013] Figure 2 It is a structural schematic diagram of the common wall guard plate.

[0014] Among them: 1. SCR reactor; 2. Reactor front wall; 3. SCR inlet flue; 31. Inlet flue rear wall; 32. Bending section; 33. Vertical section; 4. Transition section; 6. Support device; 7. Guard plate; 8. Reinforcement rib; 9. Steel plate. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0016] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] In the following description, references to "one embodiment", "an embodiment", "an example", "an example", etc. indicate that the embodiment or example described in this way may include specific features, structures, characteristics, properties, elements or limitations, but not every embodiment or example necessarily includes the specific features, structures, characteristics, properties, elements or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0018] The working principle of the SCR system is based on the selective catalytic reduction reaction, which reduces nitrogen oxides (NOx) in the flue gas into harmless nitrogen (N2) and water (H2O) through the catalyst. The flue gas first enters the system through the SCR inlet flue 3, where the design of the curved section 32 and the vertical section 33 ensures the smooth and uniform flow of the gas. After passing through the transition section 4, the flue gas enters the SCR reactor 1, undergoes a chemical reaction under the action of the catalyst, and finally discharges the treated clean gas.

[0019] In this embodiment: Figure 1 As shown, the SCR inlet flue 3 and the SCR reactor 1 are included, the SCR inlet flue 3 includes the inlet flue rear wall 31, the SCR reactor 1 includes the reactor front wall 2, the reactor front wall 2 and the inlet flue rear wall 31 are combined into a protective plate 7, and the SCR inlet flue 3 and the SCR reactor 1 achieve higher structural integrity and stability through an integrated design. By combining the front wall of the SCR reactor 1 and the rear wall of the SCR inlet flue 3 into a protective plate 7, the weak points at the connection can be reduced, thereby improving the durability and reliability of the system.

[0020] The common wall structure can omit the straight section between the SCR inlet flue 3 and the SCR reactor 1, avoiding the problem of ash accumulation in the straight section under low-load and low flue gas flow rate conditions. Reducing the straight section can also reduce the overall footprint of the SCR inlet flue 3 and the SCR reactor 1, shortening the boiler frame by about two meters and reducing the weight of the boiler steel structure.

[0021] In the prior art, the SCR inlet flue 3 and the SCR reactor 1 are supported on the boiler frame respectively. Due to different fixing points, the expansion amounts on both sides differ greatly, and a non-metallic expansion joint needs to be installed at the interface to absorb the expansion amount.

[0022] The device adopts a common wall structure of the SCR inlet flue 3 and the SCR reactor 1 to transfer the weight of the SCR inlet flue 3 to the SCR reactor 1. A supporting device 6 is arranged at the bottom of the SCR reactor 1 to make the expansion amount the same, minus a large-sized non-metallic expansion joint, and effectively reduce the cost.

[0023] The SCR inlet flue 3 is integrally formed, and includes a bent section 32 and a vertical section 33. The front section of the SCR inlet flue 3 is the bent section 32, and the rear section of the SCR inlet flue 3 is the vertical section 33. The SCR inlet flue 3 is designed as a combination of the bent section 32 and the vertical section 33, which can effectively guide the flow of flue gas. The bent section 32 helps to adjust the airflow direction, and the vertical section 33 ensures that the flue gas enters the SCR reactor 1 evenly, thereby improving the efficiency of the denitration reaction.

[0024] A transition section 4 is provided between the SCR inlet flue 3 and the SCR reactor 1 , one end of the transition section 4 is connected to the vertical section 33 , and the other end of the transition section 4 is connected to the SCR reactor 1 .

[0025] The guard plate 7 includes reinforcing ribs 8 and steel plates 9. Several reinforcing ribs 8 form a frame. The steel plates 9 are fixedly connected to the reinforcing ribs 8. The guard plate 7 forms a solid frame through the combination of the reinforcing ribs 8 and the steel plates 9, which provides higher compression and bending resistance and ensures the safe operation of the system under high temperature and high pressure conditions.

[0026] A support device 6 is provided below the SCR reactor 1, and the support device 6 below the SCR reactor 1 provides additional stability, makes the expansion amount the same, subtracts a large-sized non-metallic expansion joint, reduces vibration and displacement, and prolongs the service life of the equipment.

[0027] The transition section 4 is in a right-angled trapezoidal shape. The right-angled trapezoidal design of the transition section 4 helps to smoothly guide the airflow from the vertical section 33 to the SCR reactor 1, reduce eddy currents and pressure loss, and improve the overall efficiency of the system.

[0028] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boiler SCR flue and reactor, characterized in that: The invention comprises an SCR inlet flue and an SCR reactor, wherein the SCR inlet flue comprises an inlet flue rear wall, the SCR reactor comprises a reactor front wall, and the reactor front wall and the inlet flue rear wall are combined into a protective plate.

2. A boiler SCR flue and reactor according to claim 1, characterized in that: The SCR inlet flue is integrally formed and comprises a bent section and a vertical section. The front section of the SCR inlet flue is the bent section, and the rear section of the SCR inlet flue is the vertical section.

3. A boiler SCR flue and reactor according to claim 2, characterized in that: A transition section is provided between the SCR inlet flue and the SCR reactor, one end of the transition section is connected to the vertical section, and the other end of the transition section is connected to the SCR reactor.

4. A boiler SCR flue and reactor according to claim 3, characterized in that: The guard plate includes reinforcing ribs and a steel plate. A plurality of the reinforcing ribs form a frame, and the steel plate is fixedly connected to the reinforcing ribs.

5. A boiler SCR flue and reactor according to claim 1, characterized in that: A supporting device is arranged below the SCR reactor.

6. A boiler SCR flue and reactor according to claim 2, characterized in that: The transition section is in the shape of a right-angle trapezoid.

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