Environmentally friendly treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds

Abstract

The utility model discloses an environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas during nitriding of steel molds, comprising a cooling chamber, a pressure stabilizing chamber, an ammonia removal chamber, a detection chamber and a controller, wherein the cooling chamber, the pressure stabilizing chamber, the ammonia removal chamber and the detection chamber are connected to each other in sequence; wherein the detection chamber is equipped with a nozzle and an emptying pipe, the nozzle is connected to a spray pipe, the spray pipe is equipped with a spray valve, the emptying pipe is equipped with an emptying valve and an ammonia detector; the ammonia detector, the spray valve and the emptying valve are respectively connected to the controller for communication. The utility model has the characteristics of being able to effectively remove ammonia generated by nitriding of steel molds and preventing environmental pollution caused by exhaust gas discharge.

Description

Technical Field

[0001] The utility model relates to ammonia removal equipment, in particular to an environmentally friendly treatment device for removing undecomposed high-temperature ammonia tail gas produced by nitriding of steel moulds. Background Art

[0002] Nitriding is a chemical heat treatment process that allows nitrogen atoms to penetrate into the surface of a workpiece at a certain temperature and in a certain medium. Products treated with nitriding have excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance. For example, the nitriding process of steel molds can improve the surface hardness and wear resistance of the mold.

[0003] However, the current nitriding process mainly uses a nitriding furnace, where ammonia is passed into the nitriding furnace. Under high temperature and lack of oxygen, ammonia is decomposed into nitrogen and hydrogen. Hydrogen is directly discharged, and nitrogen penetrates into the metal to be treated. The decomposition rate of ammonia is generally between 15% and 30%, and a large amount of unused ammonia is directly discharged. Ammonia is a colorless gas with a strong pungent odor, which is low-toxic and will pollute the environment. Utility Model Content

[0004] The utility model aims to provide an environmentally friendly treatment device for removing undecomposed high-temperature ammonia tail gas produced by nitriding of steel moulds in view of the defects of the prior art.

[0005] In order to achieve the above-mentioned purpose of the utility model, the following technical solutions are adopted:

[0006] An environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, comprising a cooling chamber, a pressure stabilizing chamber, an ammonia removal chamber, a detection chamber and a controller, wherein the cooling chamber, the pressure stabilizing chamber, the ammonia removal chamber and the detection chamber are adjacent to each other in sequence; wherein the detection chamber is equipped with a nozzle and an exhaust pipe, the nozzle is connected to a spray pipe, the spray pipe is equipped with a spray valve, the exhaust pipe is equipped with an exhaust valve and an ammonia detector; the ammonia detector, the spray valve and the exhaust valve are respectively connected to the controller for communication.

[0007] Furthermore, the utility model provides an environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, which also includes a circulating pump, a temperature sensor and a heat exchanger. One end of the heat exchanger is connected to the cooling chamber, and the other end is connected to one end of the circulating pump, and the other end of the circulating pump is connected to the cooling chamber; the temperature sensor is installed in the cooling chamber; the circulating pump and the temperature sensor are electrically connected to the controller respectively.

[0008] Furthermore, the utility model provides an environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, which also includes a flow meter, one end of which is connected to the heat exchanger, and the other end is connected to the circulation pump.

[0009] Furthermore, the utility model provides an environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, which also includes a first circulation pipe and a second circulation pipe. One end of the first circulation pipe is connected to the cooling chamber, and the other end is connected to the heat exchanger; one end of the second circulation pipe is connected to the heat exchanger, and the other end is connected to the circulation pump.

[0010] Furthermore, the utility model provides an environmentally friendly treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, which also includes a cooling coil and a first air duct. The cooling coil is installed in a cooling chamber, one end of which is connected to the tail gas pipe, and the other end is connected to one end of the first air duct. The other end of the first air duct is connected to the pressure stabilizing chamber.

[0011] Furthermore, the utility model provides an environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, which also includes a second air duct, and the pressure stabilizing chamber is connected to the ammonia removal chamber through the second air duct.

[0012] Furthermore, the utility model provides an environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, which also includes a control valve and a one-way valve, wherein the control valve and the one-way valve are installed in the second air duct.

[0013] Furthermore, the utility model provides an environmentally friendly treatment device for removing undecomposed high-temperature ammonia tail gas from nitridation of steel molds, and further includes a pressure sensor, which is installed in the pressure stabilizing chamber.

[0014] Furthermore, the utility model provides an environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, which also includes a third air duct, one end of which is connected to the ammonia removal chamber, and the other end is connected to the detection chamber.

[0015] Furthermore, the controller has a touch display screen.

[0016] The present invention has significant improvements over the prior art:

[0017] 1. The utility model can effectively absorb the tail gas treated by nitridation, purify the ammonia in the tail gas, and greatly reduce the concentration of ammonia, so that the concentration of ammonia meets the emission standards. That is, the tail gas is cooled in the cooling chamber and enters the pressure stabilizing chamber. The tail gas enters the pressure stabilizing chamber to play a buffering and pressure-reducing role, and then enters the ammonia removal chamber. The ammonia removal chamber absorbs and purifies the ammonia in the tail gas to achieve the purpose of removing ammonia. The remaining tail gas enters the detection chamber. The tail gas discharged from the detection chamber is monitored in real time by the ammonia detector. If the monitored ammonia concentration is lower than the threshold, it meets the emission standards; if the monitored ammonia concentration is greater than the threshold, the controller controls the discharge valve to close and the spray valve to open, and the nozzle sprays to the inspection chamber. When the ammonia concentration monitored by the ammonia detector is lower than the threshold, the controller controls the spray valve to close and the drain valve to open.

[0018] 2. The utility model can effectively reduce ammonia emissions, effectively reduce ammonia pollution to the environment, improve air quality, and protect the ecological environment.

[0019] 3. The utility model can avoid the accumulation of ammonia in the production environment, reduce safety risks such as explosion, and ensure the health and safety of workers.

[0020] 4. The ammonia removal chamber of the utility model adopts dilute hydrochloric acid solution to absorb ammonia to produce ammonium chloride, which can be used as nitrogen fertilizer to achieve ammonia recovery and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0022] Figure 1 This is a schematic diagram of the structure of an environmentally friendly treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to the utility model;

[0023] Names and serial numbers of components in the figure:

[0024] 1-first circulation pipe, 2-heat exchanger, 3-second circulation pipe, 4-flow meter, 5-circulation pump, 6-cooling chamber, 7-cooling coil, 8-tail gas pipe, 9-temperature sensor, 10-first air pipe, 11-pressure sensor, 12-pressure stabilizing chamber, 13-second air pipe, 14-control valve, 15-controller, 16-check valve, 17-ammonia removal chamber, 18-third air pipe, 19-ammonia detector, 20-drain pipe, 21-drain valve, 22-spray pipe, 23-spray valve, 24-spray head, 25-detection chamber. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution in the present application, the technical solution of the present utility model will be clearly and completely described below in conjunction with the drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present application.

[0026] Embodiment 1:

[0027] like Figure 1As shown, this embodiment is an environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, including a cooling chamber 6, a pressure stabilizing chamber 12, an ammonia removal chamber 17, a detection chamber 25 and a controller 15. The cooling chamber 6, the pressure stabilizing chamber 12, the ammonia removal chamber 17 and the detection chamber 25 are connected to each other in sequence. The detection chamber 25 is equipped with a nozzle 24 and an emptying pipe 20, the nozzle 24 is connected to the spray pipe 22, the spray pipe 22 is equipped with a spray valve 23, and the emptying pipe 20 is equipped with an emptying valve 21 and an ammonia detector 19. The ammonia detector 19, the spray valve 23 and the emptying valve 21 are respectively connected to the controller 15 for communication.

[0028] The cooling chamber 6 is connected to an exhaust pipe 8 for conveying the exhaust gas generated by the nitriding treatment of the steel mold. The exhaust gas passes through the cooling chamber 6 and is appropriately cooled.

[0029] An ammonia detector 19 is installed on the drain pipe 20. The ammonia detector 19 can monitor the ammonia concentration discharged through the drain pipe 20 in real time, and transmit the monitored ammonia concentration information to the controller. When the monitored ammonia concentration value is lower than the ammonia concentration threshold preset on the controller, the drain valve opens, and the gas in the detection room is discharged to the outside through the drain pipe. When the monitored ammonia concentration value is higher than the ammonia concentration threshold preset on the controller, the controller controls the drain valve to close, and the gas in the detection room stops being discharged to the outside. At this time, the controller can control the spray valve to open, and the spray liquid in the spray pipe 22 is sprayed into the inspection room through the nozzle, absorbing the ammonia in the inspection room and reducing the ammonia concentration in the inspection room. It should be noted that the spray liquid can be water.

[0030] The controller 15 has a touch screen. The touch screen can display information such as the ammonia concentration in the detection room monitored by the ammonia detector 19.

[0031] It should be noted that the pressure stabilizing chamber can buffer and reduce the pressure of the tail gas, and can reduce the impact of the tail gas on the ammonia removal chamber.

[0032] In order to facilitate the acquisition of the air pressure in the pressure stabilizing chamber, a pressure sensor 11 is additionally installed. The pressure sensor 11 is installed in the pressure stabilizing chamber 12. The pressure sensor monitors the air pressure in the pressure stabilizing chamber in real time, and transmits the monitored data information to the controller, and the controller then displays the received data information through the touch display screen.

[0033] like Figure 1 As shown, a connection structure between the ammonia removal chamber and the detection chamber: the ammonia removal chamber and the detection chamber are connected through the third air duct 18. Specifically, one end of the third air duct 18 is connected to the ammonia removal chamber 17, and the other end is connected to the detection chamber 25.

[0034] In some embodiments, a cold water circulation structure of the cooling chamber is provided, and a circulation pump 5, a temperature sensor 9 and a heat exchanger 2 are additionally installed. One end of the heat exchanger 2 is connected to the cooling chamber 6, and the other end is connected to one end of the circulation pump 5, and the other end of the circulation pump 5 is connected to the cooling chamber 6. The temperature sensor 9 is installed in the cooling chamber 6 to monitor the cold water temperature of the cooling chamber. The circulation pump 5 and the temperature sensor 9 are electrically connected to the controller.

[0035] The temperature sensor 9 monitors the cold water temperature in the cooling chamber and transmits the monitored cold water temperature data information to the controller. The controller then displays the corresponding temperature data information through the touch display screen.

[0036] The controller 15 can control the working condition of the circulating pump. The touch display screen is provided with buttons for controlling the circulating pump, and can be provided with a start button and a stop button.

[0037] In some embodiments, in order to facilitate monitoring of the flow rate of the circulation pump, a flow meter 4 is additionally installed. One end of the flow meter 4 is connected to the heat exchanger 2, and the other end is connected to the circulation pump 5.

[0038] The flow meter 4 is electrically connected to the controller 15, and transmits the monitored flow to the controller, which then displays the corresponding flow data information through a touch screen.

[0039] In some embodiments, a pipeline connection structure is provided, and a first circulation pipe 1 and a second circulation pipe 3 are additionally installed. One end of the first circulation pipe 1 is connected to the cooling chamber 6, and the other end is connected to the heat exchanger 2. One end of the second circulation pipe 3 is connected to the heat exchanger 2, and the other end is connected to the circulation pump 5.

[0040] The circulation pump 5 and the cooling chamber 6 are also connected via the second circulation pipe 3 .

[0041] The circulation pump provides a power source for the flow of cold water. Working mode: When the circulation pump is started, the circulation pump extracts cold water in the cooling chamber 6 through the second circulation pipe 3, the heat exchanger 2 and the first circulation pipe 1, and sends the cold water into the cooling chamber 6 through the second circulation pipe 3, forming a closed circulation flow.

[0042] The heat exchanger 2 can adjust the temperature of the cold water in the cooling chamber, which is beneficial for the cold water in the cooling chamber to be kept within a set temperature range, and is beneficial for the cooling chamber to cool the exhaust gas entering therein.

[0043] In some embodiments, a heat exchange structure between the exhaust gas and the cold water in the cooling chamber is provided, and a cooling coil 7 and a first air duct 10 are additionally installed. The cooling coil 7 is installed in the cooling chamber 6, one end of which is connected to the exhaust pipe 8, and the other end is connected to one end of the first air duct 10, and the other end of the first air duct 10 is connected to the pressure stabilizing chamber 12.

[0044] The cooling coil 7 is placed in the cooling chamber 6, which can prolong the time for the exhaust gas to flow through the cooling chamber, thereby prolonging the time for the exhaust gas to exchange heat with the cold water in the cooling chamber, effectively reducing the exhaust gas temperature.

[0045] In some embodiments, a connection structure between the stabilizing chamber and the ammonia removal chamber is provided, wherein a second air duct 13 is additionally installed. The stabilizing chamber 12 is connected to the ammonia removal chamber 17 via the second air duct 13 .

[0046] like Figure 1 As shown, the second air guide pipe 13 is inserted below the liquid level in the ammonia removal chamber. The solution contained in the ammonia removal chamber 17 is diluted hydrochloric acid.

[0047] In some embodiments, a control valve 14 and a one-way valve 16 are additionally installed. The control valve 14 and the one-way valve 16 are installed on the second air duct 13 .

[0048] The control valve 14 can control the opening and closing of the second air duct 13. When the control valve is in an open state, the tail gas in the pressure stabilization chamber enters the ammonia removal chamber through the second air duct. When the control valve is in a closed state, the second air duct stops conveying tail gas to the ammonia removal chamber.

[0049] The one-way valve 16 plays a role in preventing back suction. When the air pressure in the pressure stabilizing chamber is lower than the air pressure in the ammonia removal chamber, the dilute hydrochloric acid in the ammonia removal chamber will be pressed into the second air duct 13, and the one-way valve will prevent the dilute hydrochloric acid from continuing to flow along the second air duct.

[0050] According to the above embodiments, the working mode of the utility model is as follows:

[0051] The tail gas generated by the nitriding treatment is transported to the cooling coil 7 of the cooling chamber 6 through the tail gas pipe 8. The tail gas flows through the cooling coil 7 and exchanges heat with the cold water in the cooling chamber to cool the tail gas. The tail gas is then guided into the pressure stabilizing chamber 12 through the first air duct 10. The pressure stabilizing chamber 12 can buffer and reduce the pressure of the tail gas entering therein. Then, the tail gas is introduced into the dilute hydrochloric acid solution of the ammonia removal chamber through the second air duct 13. The ammonia is absorbed by the dilute hydrochloric acid to purify the ammonia in the tail gas. The purified tail gas is introduced into the detection chamber 25 through the third air duct 18. The ammonia detector monitors the ammonia concentration entering the detection chamber in real time. When the monitored ammonia concentration is lower than the threshold value, the controller 15 controls the drain valve 21 to open, and the exhaust gas in the detection room can be discharged to the outside through the drain pipe 20; when the monitored ammonia concentration is greater than the threshold value, the controller 15 controls the drain valve 21 to close and the spray valve 22 to open, and the water in the spray pipe 22 is sprayed into the detection room 25 through the nozzle 24, and the ammonia is neutralized by the water to reduce the ammonia concentration in the detection room. Until the ammonia concentration monitored by the ammonia detector is lower than the threshold value, the controller 15 controls the drain valve 21 to open, and the exhaust gas in the detection room can be discharged to the outside through the drain pipe 20.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds, characterized by: It comprises a cooling chamber (6), a pressure stabilizing chamber (12), an ammonia removal chamber (17), a detection chamber (25) and a controller (15), wherein the cooling chamber (6), the pressure stabilizing chamber (12), the ammonia removal chamber (17) and the detection chamber (25) are adjacent to each other in sequence and are connected to each other; The detection chamber (25) is equipped with a nozzle (24) and an exhaust pipe (20), the nozzle (24) is connected to a spray pipe (22), the spray pipe (22) is equipped with a spray valve (23), and the exhaust pipe (20) is equipped with an exhaust valve (21) and an ammonia detector (19); The ammonia detector (19), the spray valve (23), and the drain valve (21) are all respectively connected to the controller (15) for communication.

2. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to claim 1 is characterized by: It also includes a circulation pump (5), a temperature sensor (9) and a heat exchanger (2); one end of the heat exchanger (2) is connected to the cooling chamber (6), and the other end is connected to one end of the circulation pump (5); the other end of the circulation pump (5) is connected to the cooling chamber (6); the temperature sensor (9) is installed in the cooling chamber (6); the circulation pump (5) and the temperature sensor (9) are electrically connected to the controller respectively.

3. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to claim 2 is characterized by: It also comprises a flow meter (4), one end of which is connected to the heat exchanger (2), and the other end of which is connected to the circulation pump (5).

4. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to claim 1 is characterized by: It also comprises a first circulation pipe (1) and a second circulation pipe (3), wherein one end of the first circulation pipe (1) is connected to the cooling chamber (6), and the other end is connected to the heat exchanger (2); one end of the second circulation pipe (3) is connected to the heat exchanger (2), and the other end is connected to the circulation pump (5).

5. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to claim 1 is characterized by: It also includes a cooling coil (7) and a first air duct (10); the cooling coil (7) is installed in the cooling chamber (6), one end of which is connected to the tail gas pipe (8), and the other end of which is connected to one end of the first air duct (10); the other end of the first air duct (10) is connected to the pressure stabilization chamber (12).

6. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to claim 1 is characterized by: It also includes a second air duct (13), and the pressure stabilization chamber (12) is connected to the ammonia removal chamber (17) through the second air duct (13).

7. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to claim 6 is characterized by: It also comprises a control valve (14) and a one-way valve (16), wherein the control valve (14) and the one-way valve (16) are installed on the second air guide pipe (13).

8. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to claim 1 is characterized by: It also includes a pressure sensor (11), wherein the pressure sensor (11) is installed in the pressure stabilization chamber (12).

9. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to claim 1 is characterized by: It also includes a third air guide tube (18), one end of which is connected to the ammonia removal chamber (17), and the other end of which is connected to the detection chamber (25).

10. The environmental protection treatment device for removing undecomposed high-temperature ammonia tail gas from nitriding of steel molds according to any one of claims 1 to 9, characterized in that: The controller (15) is provided with a touch display screen.

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