Denitration SCR (Selective Catalytic Reduction) reactor

Abstract

The utility model provides a denitration SCR (Selective Catalytic Reduction) reactor which comprises an inlet flue, the inlet flue is connected to a denitration reactor through a first guide plate, a second guide plate and a third guide plate, an ammonia spraying grid and a static mixer group are arranged in the second guide plate, and the third guide plate is connected with a pipeline at the top of the denitration reactor through a rectifying grid. A gas-gas heat exchanger is arranged between the rectifying grid and the denitration reactor, an outlet flue is arranged at the bottom of the denitration reactor, and a plurality of groups of catalyst layers for denitration reaction are arranged in the denitration reactor. According to the utility model, the inlet flue dust hopper and the star-shaped dust discharging valve are arranged on the inlet flue, and dust particles in flue gas are settled and collected under the action of gravity and then are discharged through the star-shaped dust discharging valve, so that the flue is prevented from being blocked and the normal operation of a system is prevented from being influenced, and the quantity of fly ash in the flue gas is reduced; the service life is prolonged, the high-efficiency performance is kept, the maintenance requirement and the operation cost are reduced, and the overall operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of denitration reactor, concretely to a denitration SCR reactor. BACKGROUND

[0002] SCR reactor, it is a kind of high-efficiency environmental protection equipment for flue gas denitration. It is through the chemical reaction of nitrogen oxides (NOx) in flue gas and reducing agent (such as ammonia or urea) under the action of catalyst, is converted into harmless nitrogen and water, to reduce the emission of NOx. Improve the combustion efficiency, reduce the pollution to the environment, is one of important environmental protection technologies in modern industry.

[0003] In the existing SCR reactor, the activity of catalyst layer is maintained by regularly maintaining and cleaning accumulated ash of catalyst layer, and the SCR reactor needs to be stopped for maintenance, so that the denitration reaction production is interrupted, resulting in reduced efficiency, and the efficiency of the deduster is insufficient, and part of fly ash remains in the flue gas entering the SCR reactor, so that the catalyst layer needs to be cleaned and maintained frequently, thereby accelerating the aging and deactivation of catalyst, resulting in the increase of production cost. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of denitration SCR reactor to solve the problems presented in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of denitration SCR reactor, comprising:

[0007] Inlet flue, the inlet flue is connected to denitration reactor by first baffle, second baffle and third baffle, the second baffle is installed with ammonia injection grid and static mixer group, the third baffle is connected with the top pipeline of denitration reactor by rectifier grid, gas-gas heat exchanger is installed between the rectifier grid and denitration reactor, outlet flue is installed in the bottom of denitration reactor, and multiple groups of catalyst layers for denitration reaction are installed in denitration reactor.

[0008] Preferably, the catalyst layer includes first layer catalyst, second layer catalyst and catalyst standby layer, the first layer catalyst, second layer catalyst and catalyst standby layer are supported and divided by reinforcing rib channel steel and support bracket channel steel installed in support.

[0009] Preferably, a plurality of acoustic dust blowers are installed on the first layer catalyst, second layer catalyst and catalyst standby layer, for cleaning catalyst dust.

[0010] Preferably, the first layer catalyst, the second layer catalyst and the catalyst standby layer are all provided with a catalyst layer maintenance door and a manhole.

[0011] Preferably, the inlet flue is fixedly connected with an inlet flue ash hopper, and a star-shaped dust discharging valve is fixedly installed below the inlet flue.

[0012] Preferably, the outlet of the outlet flue is divided into a first outlet and a second outlet, and the outlet flue is connected with an external booster fan.

[0013] Preferably, the denitration reactor is externally provided with a support for reinforcing welding support.

[0014] Preferably, the rectifying grid and the gas-gas heat exchanger are respectively provided below with a rectifying grid support and a heat exchanger support.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] The utility model discloses, install inlet flue ash hopper and star-shaped dust discharging valve on the inlet flue, utilize gravity and make the dust particle in the flue gas sedimentation and collect, then through star-shaped dust discharging valve, these collected fly ash is discharged, prevents its blockage flue, influences the normal operation of system, thereby greatly reduces the fly ash quantity in the flue gas, prolongs its service life and keeps high -efficient denitration performance, reduces maintenance demand and operating cost, thereby improves the overall operation efficiency.

[0017] The utility model discloses, set up multilayer catalyst and catalyst standby layer, reduce the system downtime when maintaining, thereby indirectly prolongs the service life of entire denitration reactor, and a plurality of acoustic wave dust blowers are arranged in each layer catalyst, and the acoustic wave dust blower makes the dust on the surface of catalyst vibrate and fall off through emitting the acoustic wave of specific frequency and intensity, thereby keeping the activity of catalyst, thereby maintaining the efficient operation of denitration reactor, improves the efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is overall structure diagram of the utility model;

[0019] Figure 2 It is overall structure plan of the utility model;

[0020] Figure 3 It is catalyst layer installation acoustic wave dust blower and manhole schematic view of the utility model;

[0021] Figure 4 It is three-dimensional schematic view of the utility model inlet flue and inlet flue ash hopper;

[0022] Figure 5 It is three-dimensional schematic view of the utility model overall structure.

[0023] In the figure: 1-inlet flue; 101-inlet flue hopper; 2-star-shaped dust unloading valve; 3-ammonia injection grid; 4-static mixer group; 5-first guide plate; 501-second guide plate; 502-third guide plate; 6-flow regulating grid; 601-flow regulating grid support; 7-gas-gas heat exchanger; 701-heat exchanger support; 8-first layer of catalyst; 9-second layer of catalyst; 10-catalyst standby layer; 11-manhole; 12-catalyst layer access door; 13-bracket; 14-outlet flue; 1401-first outlet; 1402-second outlet; 15-acoustic dust blower; 16-denitration reactor. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] Embodiment:

[0026] Please refer to Figures 1 to 5 The present application provides a technical solution:

[0027] A denitration SCR reactor comprises:

[0028] An inlet flue 1 is connected to a denitration reactor 16 through a first guide plate 5, a second guide plate 501, and a third guide plate 502, the second guide plate 501 is internally provided with an ammonia injection grid 3 and a static mixer group 4, the third guide plate 502 is connected to a top pipeline of the denitration reactor 16 through a flow regulating grid 6, a gas-gas heat exchanger 7 is installed between the flow regulating grid 6 and the denitration reactor 16, an outlet flue 14 is installed at the bottom of the denitration reactor 16, and multiple groups of catalyst layers for denitration reaction are installed in the denitration reactor 16.

[0029] In this embodiment, the inlet flue 1 is connected to an external cyclone dust collector, which can effectively remove large particles of dust in the flue gas, with a dust removal efficiency of more than 80%, but there is still some dust. In order to further remove the fly ash and improve the efficiency, an inlet flue hopper 101 and a star-shaped dust valve 2 are installed on the inlet flue 1. The side wall of the inlet flue hopper 101 is inclined, so that the bottom of the inlet flue hopper 101 is conical. The dust particles in the flue gas are settled and collected by gravity, and the collected fly ash is discharged through the star-shaped dust valve 2 to prevent it from blocking the flue and affecting the normal operation of the system. Thus, the amount of fly ash in the flue gas is greatly reduced, the catalyst is protected from damage, the service life of the catalyst is extended, the high-efficiency denitration performance is maintained, the maintenance requirements and operating costs are reduced, and the overall operating efficiency is improved.

[0030] Specifically, the inlet flue 1 is fixedly connected with an inlet flue hopper 101, and a star-shaped dust valve 2 is fixedly installed below the inlet flue 1. The inlet flue 1 is connected to an external cyclone dust collector.

[0031] In this embodiment, two outlets are provided, which can be connected to different treatment systems or devices respectively to realize shunt treatment of flue gas. The flow distribution of the two outlets can be adjusted to accurately control the flue gas flow of the entire system.

[0032] Specifically, the outlet of the outlet flue 14 is divided into a first outlet 1401 and a second outlet 1402, and the outlet flue 14 is connected to an external booster fan.

[0033] In this embodiment, multiple layers of catalysts are provided. When the flue gas enters the denitration reactor 16, the residual dust in the flue gas will form dust accumulation on the surface of the catalyst. The dust accumulation will cover the surface of the catalyst, reducing the opportunity for the catalyst to contact the nitrogen oxides in the flue gas, and thus affecting the activity of the catalyst. Multiple acoustic dust blowers 15 are arranged in each layer of catalyst. The acoustic dust blower 15 emits sound waves of a specific frequency and intensity, causing the dust accumulation on the surface of the catalyst to vibrate and fall off, thereby maintaining the activity of the catalyst and ensuring the efficient operation of the denitration reactor 16.

[0034] The multiple layers of catalysts include a catalyst standby layer 10. The first layer of catalyst 8 and the second layer of catalyst 9 will gradually age and lose activity due to high temperature, chemical reactions, etc. during long-term use. The configuration of the catalyst standby layer 10 can improve the redundancy of the denitration reactor 16. Even if the first layer of catalyst 8 and the second layer of catalyst 9 fail, the catalyst standby layer 10 can still maintain certain denitration performance, ensuring the continuous operation of the system. When the first layer of catalyst 8 and the second layer of catalyst 9 are maintained by the staff, the system downtime is reduced, thereby indirectly extending the service life of the entire denitration reactor 16.

[0035] Specific, the catalyst layer includes first layer catalyst 8, second layer catalyst 9 and catalyst backup layer 10, first layer catalyst 8, second layer catalyst 9 and catalyst backup layer 10 are supported by the reinforcing rib channel steel installed in the support 13 and the support bracket channel steel support partition.

[0036] Specific, the first layer catalyst 8, second layer catalyst 9 and catalyst backup layer 10 are installed with a plurality of acoustic dust blowers 15, for cleaning catalyst dust.

[0037] Specific, the first layer catalyst 8, second layer catalyst 9 and catalyst backup layer 10 are installed with catalyst layer access doors 12 and manholes 11.

[0038] Specific, the denitration reactor 16 has a reinforcing welding support support 13 outside.

[0039] Specific, the rectifier grid 6 and the gas-gas heat exchanger 7 are provided with rectifier grid supports 601 and heat exchanger supports 701 respectively below.

[0040] The utility model discloses in using, flue gas enters the entrance flue 1, passes through the entrance flue hopper 101 and utilizes the gravity effect to make the dust particle in flue gas settlement and collect, passes through the star type unloading valve 2 and discharges these collected fly ash, subsequently flue gas passes through the first deflector 5 and passes through ammonia grid 3 and static mixer group 4, makes ammonia and flue gas fully mix, passes through the second deflector 501 and third deflector 502 and leads to rectifier grid and changes the flow direction, flows through the gas-gas heat exchanger 7 and enters the first catalyst layer and second catalyst layer after heat exchange and completes denitration reaction, finally discharges from the exit flue 14 and enters subsequent process.

[0041] The utility model, the rest not described part can be same with prior art, or for well-known technology or can adopt prior art to realize, here no longer in detail.

[0042] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A denitration SCR reactor, characterized by, The application relates to a denitration device. The inlet flue (1) is connected to a denitration reactor (16) through a first baffle (5), a second baffle (501) and a third baffle (502), the second baffle (501) is internally provided with an ammonia injection grid (3) and a static mixer group (4), the third baffle (502) is connected to a top pipeline of the denitration reactor (16) through a rectifier grid (6), an air-air heat exchanger (7) is arranged between the rectifier grid (6) and the denitration reactor (16), an outlet flue (14) is arranged at the bottom of the denitration reactor (16), and a plurality of catalyst layers for denitration reaction are arranged in the denitration reactor (16).

2. The denitration SCR reactor according to claim 1, characterized in that: The catalyst layers comprise a first layer of catalyst (8), a second layer of catalyst (9) and a catalyst standby layer (10), and the first layer of catalyst (8), the second layer of catalyst (9) and the catalyst standby layer (10) are supported and divided through reinforcing rib channel steels and support bracket channel steels arranged in a support (13).

3. The denitration SCR reactor according to claim 2, characterized in that: A plurality of acoustic dust blowers (15) are arranged on the first layer of catalyst (8), the second layer of catalyst (9) and the catalyst standby layer (10) for cleaning catalyst dust.

4. The denitration SCR reactor according to claim 3, characterized in that: Catalyst layer maintenance doors (12) and manholes (11) are arranged on the first layer of catalyst (8), the second layer of catalyst (9) and the catalyst standby layer (10).

5. The denitration SCR reactor according to claim 1, characterized in that: An inlet flue ash hopper (101) is fixedly connected to the inlet flue (1), a star-shaped ash discharge valve (2) is fixedly arranged below the inlet flue (1), and the inlet flue (1) is connected with an external cyclone dust collector.

6. The denitration SCR reactor according to claim 1, characterized in that: The outlet of the outlet flue (14) is divided into a first outlet (1401) and a second outlet (1402), and the outlet flue (14) is connected with an external booster fan.

7. The denitration SCR reactor according to claim 1, characterized in that: The denitration reactor (16) is externally provided with a support (13) for reinforcing welding support.

8. The denitration SCR reactor according to claim 1, characterized in that: Rectifier grid supports (601) and heat exchanger supports (701) are arranged below the rectifier grid (6) and the air-air heat exchanger (7) respectively.

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