Automatic control system for denitration and ammonia spraying

Abstract

The utility model belongs to the technical field of denitration and ammonia spraying, and particularly relates to a denitration and ammonia spraying automatic control system which comprises a denitration bin, and a smoke inlet is formed in the lower side of the right side wall of the denitration bin. Flue gas enters the denitration bin through the flue gas inlet, the main pipe is connected with external mixed ammonia water and supplies the ammonia water to the lower ammonia spraying grid and the upper ammonia spraying grid, the spray heads evenly spray the ammonia water to be mixed and reacted with the flue gas, the ammonia water falls onto the flow mixer and the blades through gravity, the contact time of the ammonia water and the flue gas is prolonged, and the utilization rate of the ammonia water which is not completely reacted is increased. When the ammonia concentration detector detects that the ammonia concentration exceeds the standard, it is indicated that the ammonia spraying amount is larger than the flue gas amount at the moment, the valve is closed to stop the upper ammonia spraying grid from working, and therefore the ammonia spraying amount is reduced, the ammonia escape rate is reduced, and when the flue gas inlet amount is increased, the mixing effect is further improved. When the rotating speed sensor detects that the blade rotating speed is increased to a certain degree, the control valve is opened, the ammonia spraying amount is increased, and adjustment and control are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of denitration ammonia spraying, specifically to a denitration ammonia spraying automation control system. BACKGROUND

[0002] In common denitration technology, according to the nitrogen oxide formation mechanism, the technical measures for reducing nitrogen emission can be divided into two categories: one is to control the amount of ammonia generated in calcination from the source; the other is to control the ammonia content in the exhaust gas at the end; the mature technical solution for end treatment is selective catalytic reduction technology (SCR), which uses reducing agent (ammonia or urea) to selectively react with ammonia under the action of a metal catalyst to generate N2 and H2O; the existing selective catalytic reduction technology dissolves ammonia in water to form ammonia water, which is then transported to the exhaust pipe through a pipeline and a nozzle, and the ammonia water at the spraying site reacts with the ammonia in the exhaust gas to realize the technical function of denitration.

[0003] The ammonia spraying adjustment device of the existing part of the denitration device is selected to meet the maximum ammonia water flow requirement, and cannot be well controlled in real time; low flow rate leads to poor spraying effect, uneven mixing reaction, and increased ammonia escape rate at the SCR outlet or excessive ammonia spraying.

[0004] Therefore, a denitration ammonia spraying automation control system is proposed. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a denitration ammonia spraying automation control system to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a denitration ammonia spraying automation control system, comprising a denitration bin, a smoke inlet is arranged on the lower side of the right side wall of the denitration bin, a smoke outlet is arranged on the upper side of the right side wall of the denitration bin, a rotating rod is rotatably connected to the inner side wall of the denitration bin, blades are uniformly distributed and fixedly connected to the outer side wall of the rotating rod, a flow mixer is arranged on the upper side of the blades, a main pipe is arranged on the front side of the denitration bin, a lower ammonia spraying grid is communicated with the rear side wall of the main pipe, the lower ammonia spraying grid is installed on the inner side wall of the denitration bin, a branch pipe is communicated with the upper side of the outer side wall of the main pipe, an upper ammonia spraying grid is communicated with the right side wall of the branch pipe, the upper ammonia spraying grid is installed on the inner side wall of the denitration bin, a valve is installed on the outer side wall of the branch pipe, an ammonia concentration detector is installed on the inner side wall of the denitration bin, and a rotating speed sensor is installed on the front surface of the denitration bin.

[0007] As a further preferred embodiment of the present technical solution: a pair of catalysts are arranged on the inner side wall of the denitration bin.

[0008] As a further preferred of the technical solution: the upper side of the catalyst is provided with a rectifier, the rectifier is installed on the inner side wall of the desorption bin.

[0009] As a further preferred of the technical solution: the lower side of the desorption bin is communicated with a smoke water separation hopper, the lower end of the smoke water separation hopper is communicated with a water outlet pipe, the inner side wall of the water outlet pipe is inserted with a tapered plug, the upper surface of the tapered plug is fixedly connected with a floating ball.

[0010] As a further preferred of the technical solution: the inner side wall of the desorption bin is fixedly connected with a guide rod, the outer side wall of the guide rod is slidingly connected with the inner side walls of the tapered plug and the floating ball.

[0011] As a further preferred of the technical solution: the inner side wall of the water outlet pipe is tapered and matched with the tapered plug.

[0012] Compared with the prior art, the technical scheme has the beneficial effects that:

[0013] The flue gas enters the desorption bin through the smoke inlet, the main pipe is connected with the mixed ammonia water outside, and the lower ammonia spraying grid and the upper ammonia spraying grid are supplied, the spray head uniformly sprays the ammonia water, mixes and reacts with the flue gas, the ammonia water falls to the mixed flow device and the blade through gravity, the contact time with the flue gas is increased, the utilization rate of the ammonia water which is not completely reacted is improved, the gravity of the water cooperates with the smoke flow rate to drive the blade to rotate, and the mixing effect is further improved, when the ammonia gas concentration detector detects that the ammonia gas concentration exceeds the standard, it is indicated that the ammonia spraying amount is greater than the flue gas amount at this time, the valve is closed to stop the work of the upper ammonia spraying grid, so that the ammonia spraying amount is reduced and the ammonia escape rate is reduced, when the smoke amount increases, the speed sensor detects that the blade speed increases to a certain degree, the valve is controlled to be opened, the ammonia spraying amount is increased, and the adjustment and control are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a front view structural schematic view of the utility model;

[0015] Figure 2 It is a sectional view structural schematic view of the utility model;

[0016] Figure 3 It is a structural schematic view of the main pipe, the branch pipe and the valve in the utility model;

[0017] Figure 4 It is a structural schematic view of the tapered plug, the floating ball and the guide rod in the utility model.

[0018] In the figure: 1, out of stock warehouse; 2, into the tobacco port; 3, out of tobacco port; 4, rotating rod; 5, blade; 6, mixed flow device; 7, main pipe; 8, lower ammonia spraying grid; 9, branch pipe; 10, upper ammonia spraying grid; 11, valve; 12, ammonia gas concentration detector; 13, catalyst; 14, rectifier; 15, smoke water separation hopper; 16, water outlet pipe; 17, conical plug; 18, floating ball; 19, guide rod; 20, rotating speed sensor. DETAILED DESCRIPTION

[0019] 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. The examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not 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.

[0020] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "set" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] Please refer to Figures 1-4The utility model provides a technical scheme: a kind of denitration ammonia automatic control system, including the storehouse 1 of being taken off, the right side wall lower side of the storehouse 1 is equipped with smoke inlet 2, the right side wall upper side of the storehouse 1 is equipped with smoke outlet 3, the inner side wall of the storehouse 1 is rotatably connected with rotating rod 4, the outer side wall of rotating rod 4 is fixedly connected with the blade 5 of uniform distribution, the upper side of blade 5 is equipped with mixing flow device 6, the front side of the storehouse 1 is equipped with main pipe 7, the rear side wall of main pipe 7 is communicated with lower ammonia injection grid 8, lower ammonia injection grid 8 is installed in the inner side wall of the storehouse 1, the upper side of the outer side wall of main pipe 7 is communicated with branch pipe 9, the right side wall of branch pipe 9 is communicated with upper ammonia injection grid 10, upper ammonia injection grid 10 is installed in the inner side wall of the storehouse 1, the outer side wall of branch pipe 9 is equipped with valve 11, the inner side wall of the storehouse 1 is equipped with ammonia gas concentration detector 12, the front surface of the storehouse 1 is equipped with speed sensor 20;When using, flue gas enters the storehouse 1 by smoke inlet 2, main pipe 7 connects outside mixed ammonia water, supplies lower ammonia injection grid 8 and upper ammonia injection grid 10, and nozzle uniformly sprays ammonia water, and mixes with flue gas, and ammonia water falls on mixing flow device 6 and blade 5 by gravity, increases the contact time with flue gas, improves the utilization rate of ammonia water that is not reacted completely, and the gravity of water cooperates with smoke flow rate to drive blade 5 to rotate, further improves the mixing effect, when ammonia gas concentration detector 12 detects that ammonia gas concentration is overproof, it indicates that ammonia injection amount is greater than flue gas amount at this time, and valve 11 is closed to stop upper ammonia injection grid 10 to work, to reduce ammonia injection amount, reduce ammonia escape rate, when smoke amount increases, speed sensor 20 detects that the speed of blade 5 increases to a certain degree, control valve 11 is opened, and ammonia injection amount is increased, to facilitate adjustment and control.

[0022] In the embodiment, specifically: the inner side wall of the storehouse 1 is equipped with a pair of catalysts 13;Catalyst 13 is plate type metal oxide catalyst, promotes the reaction of nitrogen oxide and ammonia, and converts harmful into harmless nitrogen and water.

[0023] In the embodiment, specifically: the upper side of catalyst 13 is equipped with rectifier 14, and rectifier 14 is installed in the inner side wall of the storehouse 1;Rectifier 14 is used to improve the uniform distribution of flue gas.

[0024] In the embodiment, specifically: the lower side of the storehouse 1 is communicated with smoke-water separation hopper 15, the lower end of smoke-water separation hopper 15 is communicated with water outlet pipe 16, the inner side wall of water outlet pipe 16 is inserted with tapered plug 17, and the upper surface of tapered plug 17 is fixedly connected with float ball 18;After reaction, water falls into smoke-water separation hopper 15, when water level rises, the buoyancy of float ball 18 drives tapered plug 17 to rise, and water is discharged through water outlet pipe 16, when water level is lower, tapered plug 17 closes water outlet pipe 16, to prevent flue gas from leaking through water outlet pipe 16.

[0025] In the embodiment, specifically, the inner side wall of the out-of-stock bin 1 is fixedly connected with a guide rod 19, the outer side wall of the guide rod 19 is slidably connected with the inner side wall of the tapered plug 17 and the inner side wall of the floating ball 18; the guide rod 19 guarantees the stability of the movement of the floating ball 18, and facilitates the insertion of the tapered plug 17 into the water outlet pipe 16.

[0026] In the embodiment, specifically, the inner side wall of the water outlet pipe 16 is tapered, and is matched with the tapered plug 17.

[0027] The working principle of the utility model is: when in use, flue gas enters the out-of-stock bin 1 through the smoke inlet 2, the main pipe 7 is connected with the mixed ammonia water outside, and supplies the lower ammonia spraying grid 8 and the upper ammonia spraying grid 10, the spray head uniformly sprays the ammonia water, and the ammonia water is mixed with the flue gas, and falls to the mixed flow device 6 and the blade 5 through gravity, increases the contact time with the flue gas, improves the utilization rate of the ammonia water which is not completely reacted, the gravity of water cooperates with the smoke flow rate to drive the blade 5 to rotate, further improves the mixing effect, the rectifier 14 is used for improving the uniform distribution of flue gas, and the catalyst 13 is uniformly catalyzed, when the ammonia gas concentration detector 12 detects that the ammonia gas concentration exceeds the standard, it indicates that the ammonia spraying amount is greater than the flue gas amount at this time, the valve 11 is closed to stop the upper ammonia spraying grid 10 from working, thereby reducing the ammonia spraying amount and reducing the ammonia escape rate, when the smoke amount increases, the speed sensor 20 detects that the blade 5 speed increases to a certain degree, the valve 11 is controlled to be opened, the ammonia spraying amount is increased, and the adjustment and control are facilitated, the reacted water falls into the smoke-water separation hopper 15, when the water level rises, the buoyancy of the floating ball 18 drives the tapered plug 17 to rise, and the water is discharged through the water outlet pipe 16, when the water level is low, the tapered plug 17 closes the water outlet pipe 16, and prevents the flue gas from leaking through the water outlet pipe 16.

[0028] 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 modifications can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and its equivalents.

Claims

1. A kind of automatic control system of ammonia injection for denitration, including the warehouse (1) of denitration, it is characterized by: The right side wall lower side of the said out-of-stock warehouse (1) is equipped with the smoke inlet (2), the right side wall upper side of the said out-of-stock warehouse (1) is equipped with the smoke outlet (3), the inner side wall of the said out-of-stock warehouse (1) is rotatably connected with the rotating rod (4), the outer side wall of the said rotating rod (4) is fixedly connected with the uniformly distributed blade (5), the upper side of the said blade (5) is equipped with the flow mixer (6), the front side of the said out-of-stock warehouse (1) is equipped with the main pipe (7), the rear side wall of the said main pipe (7) is communicated with the lower ammonia spraying grid (8), the said lower ammonia spraying grid (8) is installed on the inner side wall of the said out-of-stock warehouse (1), the outer side wall upper side of the said main pipe (7) is communicated with the branch pipe (9), the right side wall of the said branch pipe (9) is communicated with the upper ammonia spraying grid (10), the said upper ammonia spraying grid (10) is installed on the inner side wall of the said out-of-stock warehouse (1), the outer side wall of the said branch pipe (9) is installed with the valve (11), the inner side wall of the said out-of-stock warehouse (1) is installed with the ammonia gas concentration detector (12), the front surface of the said out-of-stock warehouse (1) is installed with the rotating speed sensor (20).

2. The automatic control system for ammonia injection of desulfurization according to claim 1, characterized in that: The inner side wall of the said out-of-stock warehouse (1) is equipped with a pair of catalysts (13).

3. The automatic control system for ammonia injection of desulfurization according to claim 2, characterized in that: The upper side of the said catalyst (13) is equipped with the rectifier (14), the said rectifier (14) is installed on the inner side wall of the said out-of-stock warehouse (1).

4. The automatic control system for ammonia injection of desulfurization according to claim 1, characterized in that: The lower side of the said out-of-stock warehouse (1) is communicated with the smoke water separation hopper (15), the lower end of the said smoke water separation hopper (15) is communicated with the water outlet pipe (16), the inner side wall of the said water outlet pipe (16) is inserted with the tapered plug (17), the upper surface of the said tapered plug (17) is fixedly connected with the floating ball (18).

5. The automatic control system for ammonia injection of desulfurization according to claim 4, characterized in that: The inner side wall of the said out-of-stock warehouse (1) is fixedly connected with the guide rod (19), the outer side wall of the said guide rod (19) is slidably connected with the inner side wall of the said tapered plug (17) and the said floating ball (18).

6. The automatic control system for ammonia injection of desulfurization according to claim 4, characterized in that: The inner side wall of the said water outlet pipe (16) is tapered, which is matched with the said tapered plug (17).

Images