Molten salt system denitration device for melamine preparation

Abstract

The utility model relates to a molten salt system denitration device for melamine preparation, which comprises a reducing agent storage tank, a furnace chamber and a connecting pipeline communicated between the reducing agent storage tank and the furnace chamber, supercharging equipment is mounted on the connecting pipeline, and an insertion end of the connecting pipeline extends to the middle of the furnace chamber and is connected with a spraying component. The spraying and covering assembly comprises a spraying head and a plurality of sets of spraying pipes distributed in the circumferential direction of the spraying head, and the spraying pipes are horizontally arranged. The output position of the spraying and covering assembly is changed from the side end to the center, and a plurality of groups of spraying pipes for outputting the reducing agent are uniformly arranged on the side surface of the spraying and covering assembly, so that an intercepting curtain wall matched with the section of a furnace chamber is formed at a certain height in the furnace chamber, rising smoke is comprehensively intercepted, the possibility of smoke escape is reduced, and the service life of the furnace chamber is prolonged. And the denitration comprehensiveness is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of denitration, and particularly relates to a denitration device for a molten salt system in the preparation of melamine. Background Art

[0002] The denitration technology of melamine molten salt by selective non-catalytic reduction method is to directly inject the reducing agent into the furnace cavity through an atomizing injection system. The effective component of the reducing agent used is NH3. The principle of the denitration process is to directly inject the ammonia water solution into the appropriate temperature region of the furnace chamber, that is, 850-1050°C, through the atomizing injection system. After the ammonia water is atomized, the ammonia in it reacts with NO in the flue gas X to carry out selective non-catalytic reduction reaction, and convert NO X into pollution-free N2 and H2O, so as to achieve the purpose of reducing NOX emissions.

[0003] However, in the prior art, the injection end often injects the reducing agent from one side of the furnace cavity to the other side, and the atomized shape output by the injection end can only form a horizontally placed columnar structure in the furnace cavity, and cannot intercept the flue gas comprehensively. For example Figure 6 as shown. Summary of the Utility Model

[0004] Aiming at the problem that the ammonia gas ejected in the prior art cannot comprehensively cover the furnace cavity and there are dead corners of flue gas escape, the utility model provides a denitration device for a molten salt system in the preparation of melamine, and the specific technical solutions are as follows:

[0005] The application provides a denitration device for a molten salt system in the preparation of melamine, which includes a reducing agent storage tank, a furnace cavity, and a connecting pipe connected between the reducing agent storage tank and the furnace cavity. A pressurizing device is installed on the connecting pipe, and the insertion end of the connecting pipe extends to the middle of the furnace cavity and is connected with a spraying and coating assembly. The spraying and coating assembly includes a spray head and several groups of spray pipes circumferentially distributed around the spray head, and the spray pipes are arranged horizontally.

[0006] As a further technical solution of the utility model, a spray cavity is arranged in the spray head, a spraying and coating channel is arranged in the spray pipe, the spraying and coating channel communicates with the spray cavity, the spraying and coating channel is tangent to the spray cavity, and the spraying and coating assembly is rotatably connected with the connecting pipe.

[0007] As a further technical solution of the utility model, a baffle is rotatably arranged at the output end of the spray pipe, the baffle is eccentrically arranged relative to the cross section of the spraying and coating channel, and the rotation of the baffle can change the intercepting area of the outlet of the spraying and coating channel.

[0008] As a further technical solution of the utility model, a rotating shaft is connected to the output end of the spray pipe, and the baffle is rotationally and dampedly connected with the rotating shaft.

[0009] The beneficial effects of the utility model are as follows:

[0010] (1) In this application, by changing the output position of the spraying component from the side end to the center and evenly arranging several groups of spray nozzles for outputting reducing agent on its side, an interception curtain wall matching the cross-section of the furnace cavity is formed at a certain height within a certain furnace cavity, so as to comprehensively intercept the rising flue gas, reduce the possibility of flue gas escape, and improve the comprehensiveness of denitration.

[0011] (2) In this application, at the same time, the spraying channel is tangent to the spraying cavity, and the ejected reducing agent can give an eccentric thrust to the whole spraying component. The combination of several thrusts can drive the spray nozzle to rotate, so that the spraying component rotates while ejecting the reducing agent. On the one hand, it can reduce the spraying cavities required to form the interception curtain wall. On the other hand, due to the continuous rotation of the spraying component, the integrity of the curtain wall can be ensured to reduce the possibility of dead corners. Description of the Drawings

[0012] Figure 1 Shows the structural schematic diagram of the denitration device for the molten salt system in the preparation of melamine;

[0013] Figure 2 Shows the structural schematic diagram of the furnace cavity;

[0014] Figure 3 Shows the structural schematic diagram of the spraying component;

[0015] Figure 4 Shows the internal structural schematic diagram of the spraying component;

[0016] Figure 5 Shows the structural schematic diagram of the rotating shaft and the baffle;

[0017] Figure 6 Shows the structural schematic diagram of the prior art.

[0018] Legend Explanation:

[0019] 110, reducing agent storage tank; 120, furnace cavity; 130, connecting pipe; 140, pressurizing equipment; 200, spraying component; 210, spray head; 211, spraying cavity; 220, spray nozzle; 221, spraying channel; 230, rotating shaft; 240, baffle. Detailed Embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments.

[0021] In view of the problem that the ammonia gas ejected in the prior art cannot fully cover the furnace chamber and there are dead corners of flue gas escape, this application changes the position of the output end, sets the output end at the center, and adds multiple output ports, so that the multiple output ports are evenly distributed circumferentially, so as to achieve the purpose of fully covering the furnace chamber on the horizontal projection plane.

[0022] It should be noted that in this embodiment, the reducing agent is entirely ammonia water, but in some other embodiments, other components can also be used as the reducing agent, such as urea, liquid ammonia, etc., which is not a limitation to this application.

[0023] Figure 1 Shows a structural schematic diagram of a denitration device for a molten salt system for melamine production; Figure 1 In the figure, the denitration device for the molten salt system for melamine production includes a reducing agent storage tank 110, a furnace chamber 120, and a connecting pipe 130 connected between the reducing agent storage tank 110 and the furnace chamber 120. A pressurizing device 140 is installed on the connecting pipe 130; the reducing agent in the reducing agent storage tank 110 is sucked out by the pressurizing device 140 and transported to the furnace chamber 120 through the connecting pipe 130 to reduce the flue gas floating in the furnace chamber 120 to nitrogen and water.

[0024] Figure 2 Shows a structural schematic diagram of the furnace chamber 120; Figure 2 In the figure, the insertion end of the connecting pipe 130 extends to the middle of the furnace chamber 120 and is connected with a spraying assembly 200; by changing the output position of the spraying assembly 200, the purpose of increasing the spraying surface is achieved.

[0025] Figure 3 Shows a structural schematic diagram of the spraying assembly 200; Figure 3 In the figure, the spraying assembly 200 includes a spray head 210 and several groups of spray pipes 220 distributed circumferentially around the spray head 210. The spray pipes 220 are arranged horizontally; the reducing agent entering the spray head 210 can be sprayed out through several groups of horizontally arranged spray pipes 220, so as to form an interception curtain wall matching the cross-section of the furnace chamber 120 at a certain height in the furnace chamber 120 to fully intercept the rising flue gas, reduce the possibility of flue gas escape, and improve the comprehensiveness of denitration.

[0026] Figure 4 Shows a schematic diagram of the internal structure of the spraying assembly 200; Figure 4In this case, there is a spraying cavity 211 inside the spray head 210. A spraying channel 221 is formed inside the spray pipe 220. The spraying channel 221 is communicated with the spraying cavity 211. The spraying channel 221 is tangent to the spraying cavity 211. The spraying assembly 200 is rotatably connected to the connecting pipe 130. Since the spraying channel 221 is tangent to the spraying cavity 211, when the reducing agent in the spraying cavity 211 is ejected from the spraying channel 221, the ejected reducing agent gives an eccentric thrust to the whole spraying assembly 200. The combination of several thrusts can push the spray pipe 220 to rotate, so that the spraying assembly 200 rotates while ejecting the reducing agent. On the one hand, the number of spraying cavities 211 required to form the interception curtain wall can be reduced. On the other hand, since the spraying assembly 200 continuously rotates, the integrity of the curtain wall can be ensured to reduce the possibility of dead angles.

[0027] Figure 5 The structural schematic diagrams of the rotating shaft 230 and the baffle 240 are shown; Figure 5 In this case, a baffle 240 is rotatably arranged at the output end of the spray pipe 220. The baffle 240 is eccentrically arranged relative to the cross section of the spraying channel 221. The rotation of the baffle 240 can change the throttling area of the outlet of the spraying channel 221. When the baffle 240 rotates around its connection with the spray pipe 220, the area covering the spraying channel 221 can be changed, so as to change the throttling area of the outlet of the spraying channel 221. On the one hand, the flow velocity can be adjusted without changing the flow rate, or the throttling area can be reduced to maintain the flow velocity when the flow rate decreases. The output end of the spray pipe 220 is connected with a rotating shaft 230. The baffle 240 is rotationally and dampedly connected to the rotating shaft 230. Through this damped connection, the baffle 240 and the rotating shaft 230 can maintain the current state without external force, so as to ensure that the adjusted throttling area does not change.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. Denitration device for molten salt system in melamine preparation, comprising a reducing agent storage tank (110), a furnace chamber (120), and a connecting pipe (130) connected between the reducing agent storage tank (110) and the furnace chamber (120), wherein a pressurizing device (140) is installed on the connecting pipe (130), characterized in that, The insertion end of the connecting pipe (130) extends to the middle of the furnace cavity (120) and is connected with a spraying component (200). The spraying component (200) includes a spray head (210) and a plurality of groups of spray pipes (220) circumferentially distributed around the spray head (210). The spray pipes (220) are arranged horizontally.

2. The denitration device for the molten salt system used in the preparation of melamine according to claim 1, wherein A spray cavity (211) is provided in the spray head (210). A spraying channel (221) is defined in the spray pipe (220). The spraying channel (221) communicates with the spray cavity (211). The spraying channel (221) is tangent to the spray cavity (211). The spraying component (200) is rotatably connected with the connecting pipe (130).

3. The denitration device for the molten salt system used in the preparation of melamine according to claim 2, characterized in that, A baffle (240) is rotatably arranged at the output end of the spray pipe (220). The baffle (240) is eccentrically arranged relative to the cross-section of the spraying channel (221). Rotation of the baffle (240) can change the throttling area of the outlet of the spraying channel (221).

4. The denitration device for the molten salt system used in the preparation of melamine according to claim 3, wherein, A rotating shaft (230) is connected to the output end of the spray pipe (220). The baffle (240) is rotatably and dampedly connected with the rotating shaft (230).

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