SNCR (selective non-catalytic reduction) denitration system

Abstract

The utility model discloses an SNCR (selective non-catalytic reduction) denitration system which comprises an upper gas hood, a denitration tower, an evaporation tank, a spray hood and a retention plate, the upper gas hood is arranged at the top of the denitration tower, a chimney is arranged at the top of the upper gas hood, and a boiler flue gas inlet is arranged at the lower position of one side of the denitration tower. An evaporation tank is supported at the upper position of the other side of the denitration tower through a dragging seat, a supporting base is arranged at the bottom of the denitration tower, and supporting foot pads are arranged at the corners of the bottom of the supporting base. The evaporation tank is arranged on one side of the denitration tower through the dragging seat, and the reducing agent adding hopper and the water adding port are respectively arranged on the top and one side of the evaporation tank, so that denitration mist can be automatically and continuously generated through the evaporation tank, can be conveyed into the mist spraying cover through the conveying pipe and is uniformly sprayed into the denitration tower through the mist spraying cover, the use is convenient, the mist spraying efficiency is higher, and the practicability is high. An upper gas hood is arranged at the top of the denitration tower, and the upper gas hood is connected with a boiler flue gas inlet through a return pipe, so that the treated flue gas can be circularly treated.

Description

Technical Field

[0001] This utility model relates to the field of SNCR denitrification systems, specifically an SNCR denitrification system. Background Technology

[0002] SNCR (Selective Non-Catalytic Reduction) denitrification systems are used to purify and denitrate flue gas generated by boilers. SNCR is an economical and practical NO removal technology. Its principle is based on NH3, ...

[0003] Urea (CO, NHz), etc., are used as reducing agents, atomized before being injected into the boiler or injected into the boiler and evaporated and atomized by the heat inside the furnace. The reducing agent is injected into the furnace at a temperature of 850~1250℃, where gaseous ammonia or urea decomposes into free radicals NH and NH2. In this temperature range and in the presence of oxygen, the thermal decomposition product NH3 of the reducing agent undergoes an SNCR reaction with NOx in the flue gas to generate Nz. This method uses the furnace as a reactor.

[0004] For example, the authorized patent with publication number CN212901476U (SNCR Denitrification System for Pulverized Coal Industrial Boilers): The system includes a low-NOx pulverized coal burner, a boiler, and an SNCR denitrification system; the low-NOx pulverized coal burner is placed outside the boiler, with its tail end communicating with the boiler interior, and the SNCR denitrification system is also communicating with the boiler interior; the SNCR denitrification system includes a reducing agent preparation module, a reducing agent storage module, a reducing agent metering and delivery module, and a reducing agent injection module. The reducing agent of the SNCR denitrification system is injected into the furnace through the reducing agent injection module, so that nitrogen oxides are reduced to non-polluting N2 in the furnace. This invention achieves the ultra-low emission requirement of NOx emissions below 50 mg / m3 for coal-fired industrial boilers through the coupling of "low-NOx pulverized coal combustion + SNCR denitrification", providing a reliable solution for flue gas denitrification;

[0005] The aforementioned existing technologies cannot circulate and purify flue gas during the denitrification process, resulting in incomplete flue gas purification. Furthermore, the flue gas cannot continuously generate denitrification steam during the environmental denitrification process, making it inconvenient to use, with low denitrification efficiency. Additionally, the contact time between the flue gas and the denitrification mist is short, affecting the reaction effect and causing uneven flue gas distribution. Utility Model Content

[0006] The purpose of this invention is to provide an SNCR denitrification system to solve the problems mentioned in the background art, such as the inability to circulate and purify flue gas during the denitrification process, resulting in incomplete flue gas purification, the inability to continuously generate denitrification steam during the environmental denitrification process, inconvenience of use, low denitrification efficiency, short contact time between flue gas and denitrification mist affecting the reaction effect, and uneven distribution of flue gas.

[0007] To achieve the above object, the utility model provides following technical scheme: a SNCR denitration system, including upper air cover, denitration tower, evaporation tank, spray cover and stay plate, the top of denitration tower is equipped with upper air cover, the top of upper air cover is equipped with chimney, the lower position of one side of denitration tower is equipped with boiler flue gas inlet, the upper position of the other side of denitration tower is supported with evaporation tank through drag seat, the bottom of denitration tower is equipped with support base, and the bottom corner of support base is equipped with support foot pad.

[0008] In further embodiments, the top of the evaporation tank is provided with a reducing agent adding hopper, one side of the evaporation tank is provided with a water adding port, and the other side of the evaporation tank is provided with a conveying pipe.

[0009] In further embodiments, the inside of the denitration tower is provided with a spray cover at the upper position, and the spray cover is connected with the conveying pipe through a connecting pipe.

[0010] In further embodiments, the inside of the denitration tower is provided with a stay plate at the middle part, and the stay plate is provided with stay teeth.

[0011] In further embodiments, the SNCR denitration system further comprises flue gas hole pipes, three flue gas hole pipes are provided, and the three flue gas hole pipes are connected through a duct, and one side of the duct is connected with the boiler flue gas inlet.

[0012] In further embodiments, the upper air cover and the shunt pipe on one side of the boiler flue gas inlet are connected through a reflux pipe, and the shunt pipe is provided with an electromagnetic valve and a reflux pump.

[0013] Compared with the prior art, the SNCR denitration system has the following advantages:

[0014] The evaporation tank is arranged on one side of the denitration tower through the drag seat, the reducing agent adding hopper and the water adding port are arranged at the top and one side of the evaporation tank respectively, the denitration mist can be continuously generated automatically, and the denitration mist can be conveyed into the spray cover through the conveying pipe, then the denitration mist is uniformly sprayed into the denitration tower, so that the use is convenient and the spraying efficiency of the mist is high.

[0015] The upper air cover is arranged at the top of the denitration tower, and the upper air cover and the boiler flue gas inlet are connected through the reflux pipe, so that the treated flue gas can be recycled and treated, the flue gas treatment is more complete, a plurality of flue gas hole pipes are arranged at the lower position in the denitration tower, so that the flue gas distribution is more uniform, and the stay plate is arranged between the flue gas hole pipe and the spray cover, so that the flue gas and the mist can be fully contacted, and the flue gas treatment is more complete. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure schematic view of the SNCR denitration system of the utility model;

[0017] Figure 2 It is the structural schematic view of the denitration tower of the utility model;

[0018] Figure 3 It is the plan view of the flue hole pipe of the utility model;

[0019] Figure 4 It is the plan view of the evaporation tank of the utility model.

[0020] In the drawing: 1, chimney; 2, upper air cover; 3, electromagnetic valve; 4, backflow pipe; 5, backflow pump; 6, denitration tower; 7, boiler flue gas inlet; 8, reducing agent adding hopper; 9, conveying pipe; 10, evaporation tank; 11, drag seat; 12, support base; 13, support foot pad; 14, connecting pipe; 15, spray cover; 16, flue hole pipe; 17, retention plate; 18, shunt pipe. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0022] Please refer to Figures 1-4 An embodiment provided by the utility model: a kind of SNCR denitration system, including upper air cover 2, denitration tower 6, evaporation tank 10, spray cover 15 and retention plate 17, the top of denitration tower 6 is equipped with upper air cover 2, the top of upper air cover 2 is equipped with chimney 1, the lower side of denitration tower 6 is equipped with boiler flue gas inlet 7, and evaporation tank 10 is supported by drag seat 11 at the upper side of denitration tower 6, the bottom of denitration tower 6 is equipped with support base 12, and the bottom corner of support base 12 is equipped with support foot pad 13. By upper air cover 2 to absorb flue gas, by boiler flue gas inlet 7 to guide the flue gas generated by boiler into denitration tower 6, by evaporation tank 10 to generate mist for denitration, by support base 12 to stably support and place denitration tower 6.

[0023] The top of evaporation tank 10 is equipped with reducing agent adding hopper 8, one side of evaporation tank 10 is equipped with water inlet, the other side of evaporation tank 10 is equipped with conveying pipe 9, reducing agent adding hopper 8 is convenient to add reducing agent into evaporation tank 10.

[0024] The upper position of the inside of denitration tower 6 is equipped with spray cover 15, and spray cover 15 is connected with conveying pipe 9 through connecting pipe 14, and the reduced mist is sprayed into denitration tower 6 through spray cover 15; retention plate 17 is arranged in the middle of the inner cavity of denitration tower 6, and retention teeth are arranged on retention plate 17, and the contact time of mist and flue gas can be improved by retention plate 17.

[0025] The three flue gas hole pipes 16 are connected through a conduit, one side of the conduit is connected with the boiler flue gas inlet 7, and the flue gas can be uniformly sprayed through the three flue gas hole pipes 16; the upper gas cover 2 is connected with the shunt pipe 18 on one side of the boiler flue gas inlet 7 through a backflow pipe 4, the shunt pipe 18 is provided with an electromagnetic valve 3 and a backflow pump 5, and the flue gas can be circulated and denitration treated through the backflow pipe 4.

[0026] Working principle: in use, the reducing agent is added into the evaporation tank 10 through the reducing agent adding hopper 8, water is added into the evaporation tank 10 through the water adding port, so that the reducing agent is mixed with water, and is heated and evaporated through the internal heating module, the generated steam is transported into the connecting pipe 14 through the conveying pipe 9, is transported into the spray cover 15 through the connecting pipe 14, is uniformly sprayed out through the spray cover 15, the boiler flue gas is discharged into the flue gas hole pipe 16 through the boiler flue gas inlet 7, the flue gas is uniformly discharged through the flue gas hole pipe 16, the mist and the flue gas are atomized and reacted, so that the flue gas is denitration treated, the treated flue gas is absorbed by the upper gas cover 2, the flue gas concentration is detected, the backflow of the flue gas is controlled through the electromagnetic valve 3, and the flue gas is backflowed to the boiler flue gas inlet 7 under the action of the backflow pump 5, so that the flue gas is circulated and treated.

[0027] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the involved claims.

Claims

1. A SNCR denitration system comprising an upper gas hood (2), a denitration tower (6), an evaporation tank (10), a spray hood (15) and a residence plate (17), characterized in that: The top of the denitration tower (6) is provided with an upper gas cover (2), the top of the upper gas cover (2) is provided with a chimney (1), the lower side of the denitration tower (6) is provided with a boiler flue gas inlet (7), the upper side of the other side of the denitration tower (6) is supported by a vaporization tank (10) through a drag seat (11), the bottom of the denitration tower (6) is provided with a supporting base (12), and the bottom corner of the supporting base (12) is provided with a supporting foot pad (13).

2. The SNCR denitration system according to claim 1, characterized in that: The top of the vaporization tank (10) is provided with a reducing agent adding hopper (8), one side of the vaporization tank (10) is provided with a water adding port, and the other side of the vaporization tank (10) is provided with a conveying pipe (9).

3. The SNCR denitration system according to claim 1, characterized in that: The upper inner side of the denitration tower (6) is provided with a spray cover (15), and the spray cover (15) is connected with the conveying pipe (9) through a connecting pipe (14).

4. The SNCR denitration system according to claim 1, characterized in that: The middle inner cavity of the denitration tower (6) is provided with a retention plate (17), and the retention plate (17) is provided with retention teeth.

5. The SNCR denitration system according to claim 1, characterized in that: The flue gas hole pipe (16) is provided with three, and the three flue gas hole pipes (16) are connected through a conduit, and one side of the conduit is connected with the boiler flue gas inlet (7).

6. The SNCR denitration system according to claim 1, characterized in that: The upper gas cover (2) and the shunt pipe (18) on one side of the boiler flue gas inlet (7) are connected through a backflow pipe (4), and the shunt pipe (18) is provided with an electromagnetic valve (3) and a backflow pump (5).

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