Efficient ammonia spraying grid for mixed ammonia water

Abstract

The utility model relates to the technical field of flue gas treatment equipment, in particular to a high-efficiency ammonia spraying grid for mixing ammonia water, which comprises a mixing tank, a plurality of groups of ammonia spraying components are axially arranged in the mixing tank, each ammonia spraying component comprises a feeding main pipe, the feeding main pipe is connected with a partition feeding pipeline through a control component, and the top of the partition feeding pipeline is connected with a flow guide component. And a detection assembly is arranged below the feeding pipeline. According to the utility model, the flow guide components are arranged above the nozzles, the flue gas and the ammonia gas are uniformly divided into a plurality of strands simultaneously by utilizing the flow guide plates, the contact area of the ammonia gas and the flue gas is increased, the mixing efficiency is improved, in addition, the flue gas and the ammonia gas can rise spirally due to the inclination angle of the flow guide plates, and the mixing effect can be improved through the matching of the plurality of flow guide components; the NOx concentration below the ammonia spraying assembly is detected in a partitioned mode through the detection assembly, the control valve and the flow detection assembly are matched, the feeding amount of different ammonia spraying main pipes is controlled, then the ammonia spraying amount is controlled, and ammonia escape is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas treatment equipment technical field, concretely is a kind of high-efficiency mixed ammonia water ammonia injection grid. BACKGROUND

[0002] SCR flue gas denitration technology, namely selective catalytic reduction denitration technology, also called ammonia catalytic reduction method denitration, with higher denitration efficiency, reducing agent consumption low and the like advantages, suitable for the flue gas denitration of various flue gases such as coal-fired boiler, cement kiln, lime rotary kiln, sintering machine, with broad application prospect.

[0003] But in prior art, because the NOx concentration in flue gas fluctuates due to various reasons, and the resistance in pipeline, the concentration of NOx is different at different positions of uniform cross section, leading to the problem of ammonia escape at SCR outlet, ammonia escape will lead to air preheater blockage, and will also cause resource waste and environmental pollution problems.

[0004] The utility model discloses a kind of high-efficiency mixed ammonia injection grid for SCR denitration process, nozzle is arranged in V shape at the top of grid pipe, and fin is set on both sides of nozzle, utilize the fin to make flue gas change from laminar flow to turbulent flow, to improve the mixing efficiency of ammonia gas and flue gas, but only change the flow state of flue gas, and the influence on ammonia gas movement state is less, and the change of mixed state is limited, in addition, the concentration fluctuation problem of NOx in flue gas is not solved. UTILITY MODEL CONTENTS

[0005] In order to make up for the above shortcomings, the utility model provides a kind of high-efficiency mixed ammonia water ammonia injection grid.

[0006] The technical scheme of the utility model is:

[0007] A kind of high-efficiency mixed ammonia water ammonia injection grid, comprising:

[0008] Mixing tank, the mixing tank is axially provided with several groups of ammonia injection components, the ammonia injection component includes feed main pipe, the feed main pipe is connected with partition feed pipe line by control component, the partition feed pipe line top is connected with flow guide component, the flow guide component is used to change the flow state of ammonia gas and flue gas, detection component is provided below the feed pipe line, and the detection component is used to detect the concentration of NOx.

[0009] Preferably, the partition feed pipe line includes several feed sub-pipes, each feed sub-pipe tail end is connected with several ammonia injection main pipes, and the ammonia injection main pipes are arranged on the same plane.

[0010] Preferably, the ammonia injection main pipe top surface is uniformly provided with several nozzles, and the flow guide component is located directly above the nozzle.

[0011] Preferably, the control assembly comprises a control valve, and the control valve is connected with the main feeding pipe.

[0012] Preferably, the outlet of the control valve is connected with a flow detection assembly, and the flow detection assembly is connected with the sub-feeding pipe.

[0013] Preferably, the flow guide assembly comprises a connecting plate, and a gap is left between the bottom surface of the connecting plate and the nozzle; and a plurality of flow guide plates are uniformly arranged on the side surface of the connecting plate, and the flow guide plates are arranged at an angle with the horizontal plane.

[0014] Preferably, the detection assembly comprises a plurality of wire pipes, and the wire pipes are arranged below the main ammonia injection pipe; and a plurality of concentration detection devices are connected to the bottom end of the wire pipes.

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

[0016] The utility model discloses a flow guide assembly is arranged above the nozzle, and the flow guide plate is used for dividing the flue gas and ammonia gas into a plurality of strands simultaneously and uniformly, increasing the contact area of the flue gas and ammonia gas, improving the mixing efficiency, and the inclination angle of the flow guide plate can make the flue gas and ammonia gas rise spirally, and the mixing effect can be improved by cooperation of a plurality of flow guide assemblies. The detection assembly is used for detecting the NOx concentration below the ammonia injection assembly, and the control valve and the flow detection assembly are used for controlling the feeding amount of different main ammonia injection pipes, thereby controlling the ammonia injection amount and reducing ammonia escape. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic diagram of the utility model;

[0018] Figure 2 It is the structure schematic diagram of the mixing tank in the utility model;

[0019] Figure 3 It is the structure schematic diagram of the ammonia injection assembly and the detection assembly in the utility model;

[0020] Figure 4 It is the structure schematic diagram of the ammonia injection assembly and the flow guide assembly in the utility model;

[0021] Figure 5 It is Figure 4 It is the structure enlarged schematic diagram of place A in the utility model.

[0022] The meaning of each reference numeral in the drawing is as follows:

[0023] 1, mixing tank; 11, tank body; 12, air inlet; 13, air outlet;

[0024] 2, ammonia injection assembly; 21, main feeding pipe; 22, sub-feeding pipe; 23, control valve; 24, flow detection assembly; 25, main ammonia injection pipe; 26, nozzle.

[0025] 3, diversion assembly; 31, fixed rod; 32, connecting plate; 33, diversion plate;

[0026] 4, detection assembly; 41, detection frame; 42, threading pipe; 43, concentration detection device. DETAILED DESCRIPTION

[0027] 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, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0028] Embodiment 1:

[0029] Please refer to Figures 1-5 The above technical solutions are described in detail through the following embodiments.

[0030] A high-efficiency mixed ammonia water ammonia spraying grid comprises:

[0031] The mixed tank 1 is axially provided with a plurality of groups of ammonia spraying assemblies 2. The ammonia spraying assembly 2 comprises a feeding main pipe 21. The feeding main pipe 21 is connected with a partition feeding pipeline through a control assembly. The partition feeding pipeline is connected with a diversion assembly 3 at the top. The diversion assembly 3 is used for changing the flow state of ammonia gas and flue gas. The feeding pipeline is provided below the detection assembly 4. The detection assembly 4 is used for detecting the concentration of NOx.

[0032] The mixed tank 1 comprises a tank body 11. The tank body 11 is provided at the bottom with an air inlet 12 fixedly installed through bolts. The tank body 11 is provided at the top with an air outlet 13 fixedly installed through bolts.

[0033] The flue gas flows from the bottom to the top in the mixed tank 1.

[0034] The feeding main pipe 21 is located outside the mixed tank 1 and is used for connecting to the partition feeding pipeline to deliver ammonia gas.

[0035] The partition feeding pipeline comprises three feeding branch pipes 22. Each feeding branch pipe 22 is connected at the tail end with two ammonia spraying main pipes 25. The ammonia spraying main pipes 25 are evenly arranged on the same plane.

[0036] The feeding branch pipe 22 is welded with the tank body 11. The tail end of the feeding branch pipe 22 extends into the tank body 11 and is welded with the ammonia spraying main pipe 25.

[0037] The ammonia spraying main pipe 25 is uniformly provided at the top surface with six nozzles 26. The diversion assembly 3 is located directly above the nozzles 26.

[0038] The nozzle 26 is perpendicular to the axis of the ammonia injection main pipe 25 and vertically upward.

[0039] The control assembly comprises a control valve 23, and the feed inlet of the control valve 23 is connected with the feed main pipe 21.

[0040] The control valve 23 can be an electric proportional control valve or a pneumatic regulating valve, which is used for controlling the discharge amount of the feed main pipe 21.

[0041] The discharge outlet of the control valve 23 is connected with a flow detection assembly 24, and the flow detection assembly 24 is connected with the feed branch pipe 22.

[0042] The flow detection assembly 24 is used for detecting the ammonia flow entering the ammonia injection main pipe 25 from the control valve 23.

[0043] The flow guide assembly 3 comprises a connecting plate 32, and a gap is left between the bottom surface of the connecting plate 32 and the nozzle 26. A plurality of flow guide plates 33 are uniformly welded on the side surface of the connecting plate 32, and the flow guide plates 33 have an angle with the horizontal plane.

[0044] The bottom of the connecting plate 32 is fixedly connected with the nozzle 26 through a fixing rod 31.

[0045] The nozzle 26 sprays ammonia upward, and the ammonia is blocked by the flow guide plates 33 and is divided into a plurality of flows and flows upward along the flow guide plates 33. The flue gas is also blocked by the flow guide plates 33 when flowing upward and is divided into a plurality of flows and flows upward along the flow guide plates 33.

[0046] The flue gas and the ammonia are divided by the flow guide plates 33, so that the contact area of the flue gas and the ammonia is increased, and the mixing effect is improved. Meanwhile, the plurality of flow guide plates 33 cooperate to change the flow state of the flue gas and the ammonia, so that the turbulent flow is increased and the mixing effect is improved.

[0047] The detection assembly 4 comprises a plurality of wire-through pipes 42, and the wire-through pipes 42 are located below the ammonia injection main pipe 25. The bottom end of the wire-through pipe 42 is connected with a plurality of concentration detection devices 43.

[0048] The wire-through pipe 42 is fixedly installed between the ammonia injection main pipes 25 through a detection frame 41. The wire-through pipe 42 is used for protecting the data transmission cable of the concentration detection device 43, and the concentration detection device 43 is used for detecting the concentration of NOx in the flue gas.

[0049] A plurality of concentration detection devices 43 are arranged on the same plane, so that the horizontal concentration distribution of NOx in the flue gas and the fluctuation of the concentration with time can be detected. According to the detection data of the concentration detection device 43, data support can be provided for the adjustment of the control valve 23.

[0050] When the operator uses the device, the flue gas is introduced into the tank body 11 from the gas inlet 12 and moves upward along the axis of the tank body 11.

[0051] Simultaneously, ammonia is injected into the supply main pipe 21, and is sprayed from the nozzle 26 after sequentially passing through the control valve 23, the flow detection assembly 24, the supply branch pipe 22 and the ammonia injection main pipe 25.

[0052] The upward movement of the flue gas first encounters the concentration detection device 43, which detects the horizontal concentration distribution of NOx in the flue gas.

[0053] According to the concentration of NOx, the control valve 23 is controlled to work, the amount of supply in different supply branch pipes 22 is changed, and the amount of material sprayed from the nozzle 26 of different ammonia injection main pipes 25 is changed, so as to match different NOx concentration distribution and reduce ammonia escape.

[0054] According to the concentration fluctuation of NOx, the number of ammonia injection assemblies 2 in use is determined.

[0055] When the concentration of NOx is low, one set of ammonia injection assemblies 2 is sufficient.

[0056] When the concentration of NOx is too high, and the total amount of ammonia sprayed by one set of ammonia injection assemblies 2 cannot meet the processing needs, the upper ammonia injection assemblies 2 can be put into use.

[0057] The above shows and describes the basic principle, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application, and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A high efficiency mixed ammonia water ammonia injection grid characterized by, Include: Mixing tank (1), several groups of ammonia injection assembly (2) are arranged axially in the mixing tank (1), the ammonia injection assembly (2) includes a supply main pipe (21), the supply main pipe (21) is connected with a partition supply pipeline through a control assembly, the partition supply pipeline is connected with a flow guide assembly (3) at the top, the flow guide assembly (3) is used for changing the flow state of ammonia and flue gas, a detection assembly (4) is arranged below the supply pipeline, and the detection assembly (4) is used for detecting the concentration of NOx.

2. A high efficiency mixed ammonia water ammonia injection grid according to claim 1, wherein: The partition supply pipeline includes several supply sub-pipes (22), the tail end of each supply sub-pipe (22) is connected with several ammonia injection main pipes (25), and the ammonia injection main pipes (25) are arranged on the same plane.

3. A high efficiency mixed ammonia water ammonia injection grid according to claim 2, wherein: The top surface of the ammonia injection main pipe (25) is uniformly provided with several nozzles (26), and the flow guide assembly (3) is located directly above the nozzle (26).

4. A high efficiency mixed ammonia water ammonia injection grid according to claim 2, wherein: The control assembly includes a control valve (23), and the inlet of the control valve (23) is connected with the supply main pipe (21).

5. A high efficiency mixed ammonia water ammonia injection grid according to claim 4 wherein: The outlet of the control valve (23) is connected with a flow detection assembly (24), and the flow detection assembly (24) is connected with the supply sub-pipe (22).

6. A high efficiency mixed ammonia water ammonia injection grid as claimed in claim 3 wherein: The flow guide assembly (3) includes a connecting plate (32), and a gap is left between the bottom surface of the connecting plate (32) and the nozzle (26), the side surface of the connecting plate (32) is uniformly provided with several flow guide plates (33), and the flow guide plates (33) form an angle with the horizontal plane.

7. A high efficiency mixed ammonia water ammonia injection grid according to claim 2 wherein: The detection assembly (4) includes several threading pipes (42), the threading pipes (42) are located below the ammonia injection main pipes (25), and the bottom end of the threading pipes (42) is connected with several concentration detection devices (43).

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