Ammonia gas preheating device for ferrovanadium nitridation reaction

Abstract

The utility model relates to an ammonia gas preheating device for ferrovanadium nitridation reaction, which comprises a preheater, the bottom of the preheater is provided with a gas inlet, the top of the preheater is provided with a gas outlet, a heat exchange type preheating assembly, a flow guide detection assembly and a supplementary heating assembly are sequentially arranged in the preheater from bottom to top, and one side of the supplementary heating assembly is connected with a straight exhaust pipeline in parallel. And a direct discharge control valve is arranged on the direct discharge pipeline. When the ammonia gas preheating device is used for preheating ammonia gas, the ammonia gas is firstly subjected to heat exchange and preheating through the heat exchange type preheating assembly, after the ammonia gas is detected by the flow guide detection assembly, if the temperature can meet the requirement, the ammonia gas directly enters a subsequent reaction furnace body through the direct exhaust pipeline and the exhaust port, and if the temperature does not meet the requirement, the ammonia gas can be heated and preheated through the supplementary heating assembly; and then the ammonia gas enters the subsequent reaction furnace body through the exhaust port, so that the preheating effect of the ammonia gas can be better controlled, and the nitriding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas preheating, in particular to an ammonia preheating device for vanadium iron nitriding reaction. Background Art

[0002] High-nitrogen ferrovanadium is an important metal material with excellent magnetic and mechanical properties, and is widely used in fields such as electronics and magnetic materials. The main raw materials for preparing ferrovanadium nitride are ferrovanadium and ammonia. The production process of ferrovanadium nitride mainly involves reacting ferrovanadium and ammonia at high temperature to combine vanadium in ferrovanadium with nitrogen to form vanadium nitride. The specific process includes: putting ferrovanadium into a nitriding furnace, introducing preheated ammonia, controlling the flow rate and temperature of ammonia, controlling the temperature in the nitriding furnace, and carrying out nitriding reaction at a certain temperature.

[0003] Ammonia needs to be preheated in advance so that it can participate in the reaction better and faster after entering the nitriding furnace. The existing ammonia preheating generally only uses waste heat gas for preheating, which may not be preheated sufficiently, and the heat exchange time and degree also need to be strengthened. Content of the Utility Model

[0004] The utility model aims to solve the deficiencies of the prior art and provides an ammonia preheating device for vanadium iron nitriding reaction.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] An ammonia preheating device for vanadium iron nitriding reaction includes a preheater. The bottom of the preheater is provided with an air inlet and the top is provided with an exhaust port. Inside the preheater, there are successively arranged from bottom to top a heat exchange type preheating component, a diversion detection component, and a supplementary heating component. A straight exhaust pipe is connected in parallel on one side of the supplementary heating component, and a straight exhaust control valve is arranged on the straight exhaust pipe.

[0007] The heat exchange type preheating component includes an upper closed partition and a lower closed partition arranged on the inner wall of the preheater. A waste heat gas circulation cavity is formed between the upper closed partition, the lower closed partition and the inner wall of the preheater. The side wall of the preheater is provided with a waste heat gas inlet and a waste heat gas outlet corresponding to the waste heat gas circulation cavity. A number of ammonia circulation channels penetrating up and down are arranged between the upper closed partition and the lower closed partition.

[0008] The diversion detection component includes an eight-shaped diversion plate fixed on the inner wall of the preheater. A main pipe is arranged at the top of the eight-shaped diversion plate, and a temperature monitor is installed on the main pipe.

[0009] The supplementary heating component includes a supplementary heating diversion pipe connected to the top of the diversion detection component. A supplementary heating control valve is provided on the supplementary heating diversion pipe. The top of the supplementary heating diversion pipe is connected to a heating cylinder. An outlet pipe is provided at the top of the heating cylinder. A sleeve is provided outside the heating cylinder, and a heating resistor is provided inside the sleeve.

[0010] At the upper end inside the preheater, there is a closing plate. An exhaust cavity is formed between the closing plate and the preheater above. The top of the outlet pipe and the direct discharge pipe penetrate through the closing plate and extend into the exhaust cavity.

[0011] The beneficial effects of the present utility model are as follows: When preheating ammonia gas in the present utility model, the ammonia gas first undergoes heat exchange and preheating through the heat exchange type preheating component. After being detected by the diversion detection component, if the temperature can meet the requirements, it directly enters the subsequent reaction furnace body through the direct discharge pipe and the exhaust port. If the temperature does not meet the requirements, it can be heated and preheated through the supplementary heating component, and then enters the subsequent reaction furnace body through the exhaust port, which can better control the preheating effect of ammonia gas and improve the nitriding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural schematic diagram of the present utility model;

[0013] In the figure: 1 - preheater; 2 - air inlet; 3 - exhaust port; 4 - heat exchange type preheating component; 5 - diversion detection component; 6 - supplementary heating component; 7 - direct discharge pipe; 8 - direct discharge control valve; 9 - closing plate; 10 - exhaust cavity; 11 - horizontal flow dividing plate;

[0014] 41 - upper closing partition; 42 - lower closing partition; 43 - waste heat gas flow cavity; 44 - waste heat gas inlet; 45 - waste heat gas outlet; 46 - ammonia gas flow channel; 47 - helix;

[0015] 51 - eight - shaped diversion plate; 52 - main pipe; 53 - temperature monitor;

[0016] 61 - supplementary heating diversion pipe; 62 - supplementary heating control valve; 63 - heating cylinder; 64 - outlet pipe; 65 - sleeve; 66 - heating resistor; 67 - horizontal baffle;

[0017] The following will be described in detail with reference to the embodiments of the present utility model and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The illustrated embodiments are only used to explain the present utility model and are not intended to limit the scope of the present utility model. In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the accompanying drawings. The advantages and features of the present utility model will be more apparent according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise scales, and are only used to facilitate and clearly assist in explaining the objectives of the embodiments of the present utility model.

[0019] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used herein in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments:

[0022] As Figure 1 shown, an ammonia preheating device for ferrovanadium nitriding reaction includes a preheater 1, an air inlet 2, an exhaust port 3, a heat exchange type preheating component 4, a diversion detection component 5, a supplementary heating component 6, a direct exhaust pipe 7, a direct exhaust control valve 8, a closing plate 9, an exhaust cavity 10 and a horizontal flow dividing plate 11.

[0023] The preheater 1 is provided with an air inlet 2 at the bottom and an exhaust port 3 at the top. Inside the preheater 1, a heat exchange type preheating component 4, a diversion detection component 5, and a supplementary heating component 6 are sequentially arranged from bottom to top. A direct exhaust pipe 7 is connected in parallel on one side of the supplementary heating component 6, and a direct exhaust control valve 8 is provided on the direct exhaust pipe 7.

[0024] When the present utility model preheats ammonia gas, the ammonia gas enters the inside of the preheater 1 from the air inlet 2. First, it undergoes heat exchange and preheating through the heat exchange type preheating component 4. After being detected by the flow guiding and detecting component 5, if the temperature can meet the requirements, it directly enters the subsequent reaction furnace body through the direct discharge pipe 7 and the exhaust port 3. If the temperature does not meet the requirements, it can be heated and preheated through the supplementary heating component 6, and then enters the subsequent reaction furnace body through the exhaust port 3. In this way, the preheating effect of ammonia gas can be better controlled, and the nitriding efficiency is improved.

[0025] The heat exchange type preheating component 4 includes an upper closed partition 41 and a lower closed partition 42 arranged on the inner wall of the preheater 1. A waste heat gas flow chamber 43 is formed between the upper closed partition 41, the lower closed partition 42 and the inner wall of the preheater 1. A waste heat gas inlet 44 and a waste heat gas outlet 45 are provided on the side wall of the preheater 1 corresponding to the waste heat gas flow chamber 43. A number of ammonia gas flow channels 46 penetrating up and down are arranged between the upper closed partition 41 and the lower closed partition 42.

[0026] The ammonia gas flow channels 46 can distribute the ammonia gas in multiple channels to exchange heat with the waste heat gas flowing in the waste heat gas flow chamber 43, and the heat exchange effect is better.

[0027] A spiral 47 is provided in the ammonia gas flow channel 46. The spiral 47 can delay the flow time of the ammonia gas and conduct more sufficient heat exchange.

[0028] The flow guiding and detecting component 5 includes an eight-shaped flow guiding plate 51 fixed on the inner wall of the preheater 1. A main pipe 52 is provided at the top of the eight-shaped flow guiding plate 51, and a temperature monitor 53 is installed on the main pipe 52. The temperature monitor 53 can detect the temperature of the ammonia gas after heat exchange. If it meets the requirements, it enters the direct discharge pipe 7. If it does not meet the requirements, it enters the supplementary heating component 6.

[0029] The supplementary heating component 6 includes a supplementary heating flow guiding pipe 61 connected to the top of the flow guiding and detecting component 5. A supplementary heating control valve 62 is provided on the supplementary heating flow guiding pipe 61. The top of the supplementary heating flow guiding pipe 61 is connected to a heating cylinder 63. An outlet pipe 64 is provided at the top of the heating cylinder 63. A sleeve 65 is provided outside the heating cylinder 63, and a heating resistor 66 is provided inside the sleeve 65.

[0030] The ammonia gas can be secondarily heated in the heating cylinder 63 by using the heating resistor 66 to make its temperature reach the usage requirements.

[0031] A phase change medium is filled in the sleeve 65. After the phase change medium is heated to the phase change point, it will not continue to heat up. In this way, it can avoid overheating of the ammonia gas by the heating resistor 66 and maintain the temperature stability.

[0032] A plurality of horizontal baffles 67 are arranged alternately from bottom to top on the inner wall of the heating cylinder 63, thereby extending the circulation time of the ammonia gas and achieving more complete heating.

[0033] A closing plate 9 is provided at the upper end of the preheater 1 , and an exhaust cavity 10 is formed between the upper part of the closing plate 9 and the preheater 1 . The top of the outlet pipe 64 and the straight exhaust pipe 7 pass through the closing plate 9 and extend into the exhaust cavity 10 .

[0034] A horizontal diverter plate 11 is provided in the preheater 1 just above the air inlet 2 , so as to better distribute the incoming ammonia gas inside. The horizontal diverter plate 11 is located below the lower closed partition 42 .

[0035] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An ammonia preheating device for vanadium iron nitriding reaction, characterized in that: The invention comprises a preheater (1), wherein the preheater (1) is provided with an air inlet (2) at the bottom and an air outlet (3) at the top, wherein a heat exchange preheating component (4), a flow guide detection component (5), and a supplementary heating component (6) are sequentially arranged in the preheater (1) from bottom to top, wherein a direct discharge pipe (7) is connected in parallel to one side of the supplementary heating component (6), and a direct discharge control valve (8) is arranged on the direct discharge pipe (7).

2. The ammonia preheating device for vanadium iron nitriding reaction according to claim 1 is characterized in that: The heat exchange preheating assembly (4) comprises an upper closed baffle (41) and a lower closed baffle (42) arranged on the inner wall of the preheater (1); a waste heat gas circulation cavity (43) is formed between the upper closed baffle (41), the lower closed baffle (42) and the inner wall of the preheater (1); a waste heat gas inlet (44) and a waste heat gas outlet (45) are arranged on the side wall of the preheater (1) corresponding to the waste heat gas circulation cavity (43); and a plurality of ammonia gas circulation channels (46) penetrating from top to bottom are arranged between the upper closed baffle (41) and the lower closed baffle (42).

3. The ammonia preheating device for vanadium iron nitriding reaction according to claim 2 is characterized in that: A spiral (47) is provided in the ammonia flow channel (46).

4. The ammonia preheating device for vanadium iron nitriding reaction according to claim 3 is characterized in that: The flow guide detection assembly (5) comprises an eight-shaped flow guide plate (51) fixed on the inner wall of the preheater (1), a main pipeline (52) is arranged on the top of the eight-shaped flow guide plate (51), and a temperature monitoring meter (53) is installed on the main pipeline (52).

5. The ammonia preheating device for vanadium iron nitriding reaction according to claim 4, characterized in that: The supplementary heating component (6) comprises a supplementary heating flow guide pipe (61) connected to the top of the flow guide detection component (5), a supplementary heating control valve (62) is provided on the supplementary heating flow guide pipe (61), a heating tube (63) is connected to the top of the supplementary heating flow guide pipe (61), a lead-out pipe (64) is provided on the top of the heating tube (63), a sleeve (65) is provided outside the heating tube (63), and a heating resistor (66) is provided inside the sleeve (65).

6. The ammonia preheating device for vanadium iron nitriding reaction according to claim 5, characterized in that: The sleeve (65) is filled with a phase change medium.

7. The ammonia preheating device for vanadium iron nitriding reaction according to claim 6, characterized in that: A plurality of horizontal baffles (67) are arranged alternately from bottom to top on the inner wall of the heating cylinder (63).

8. The ammonia preheating device for vanadium iron nitriding reaction according to claim 7, characterized in that: A closing plate (9) is provided at the upper end of the preheater (1), and an exhaust cavity (10) is formed between the upper portion of the closing plate (9) and the preheater (1). The top of the outlet pipe (64) and the straight discharge pipe (7) pass through the closing plate (9) and extend into the exhaust cavity (10).

9. The ammonia preheating device for vanadium iron nitriding reaction according to claim 8, characterized in that: A horizontal flow divider plate (11) is provided in the preheater (1) just above the air inlet (2), and the horizontal flow divider plate (11) is located below the lower closed partition plate (42).

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