A furnace denitrification and ammonia supply system

Abstract

The utility model relates to the technical field of denitration and ammonia supply, and in particular to a furnace denitration and ammonia supply system, which aims to solve the problem that the existing system can only match one furnace, and when multiple furnaces are used, the same number of denitration and ammonia supply systems need to be configured, which leads to many pipelines, large floor space, high investment and construction costs, and inconvenient management. The utility model includes a gas supply unit, a gas storage unit, and a gas separation unit; the inlet of the gas storage unit is connected to the outlet of the gas supply unit, the outlet of the gas storage unit is connected to the inlet of the gas separation unit, and the outlet of the gas separation unit is connected to the denitration nozzle; multiple gas separation units are arranged in parallel and correspond to the furnaces one by one. The utility model divides a gas supply unit into multiple gas sources corresponding to the number of furnaces by setting multiple gas separation units, avoids setting gas supply units equal to the number of furnaces, reduces pipeline settings, reduces floor space, investment and construction costs, and usage costs, and is conducive to centralized management of ammonia supply.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration and ammonia supply, in particular to a furnace denitration and ammonia supply system. Background Art

[0002] The furnace denitrification process is a treatment method widely used in metallurgy, glass and chemical industries to control the concentration of nitrogen oxides in flue gas. This process requires the use of a denitrification ammonia supply system to supply the ammonia used for denitrification to the nozzles set in the denitrification holes reserved in the furnace exhaust flue. Specifically, the denitrification nozzle extends into the exhaust flue, and ammonia and atomizing substances are used to atomize the ammonia to achieve the flue gas denitrification effect. The ammonia supply flow and pressure in this system are controlled by DCS and displayed on the display screen in the control room so that the staff can observe the material usage of each reaction device in the denitrification process in real time.

[0003] In the actual production process, each furnace flue gas denitrification ammonia supply system is an independent control system. If there are several furnaces in the factory, several denitrification ammonia supply systems will be established, resulting in many pipelines, large floor space, high investment and construction costs and unfavorable centralized management. Utility Model Content

[0004] The purpose of the utility model is to provide a furnace denitration and ammonia supply system to solve the problem that the existing system can only match one furnace, and when multiple furnaces are used, the same number of denitration and ammonia supply systems need to be configured, which leads to many pipelines, large floor space, high investment and construction costs and inconvenient management.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0006] A furnace denitration and ammonia supply system, comprising a gas supply unit, a gas storage unit and a gas separation unit;

[0007] The inlet of the gas storage unit is communicated with the outlet of the gas supply unit, the outlet of the gas storage unit is communicated with the inlet of the gas separation unit, and the outlet of the gas separation unit is communicated with the denitration nozzle;

[0008] A plurality of the gas separation units are arranged in parallel and correspond one to one with the furnaces.

[0009] Furthermore, the gas supply unit includes a gas supply switch valve and a gas supply pipeline;

[0010] One end of the gas supply pipeline is connected to the gas supply switch valve, and the other end is connected to the gas storage unit;

[0011] The gas supply pipeline comprises a gas supply main pipeline and a gas supply bypass pipeline which are arranged in parallel.

[0012] Further, the main gas supply line includes a first inspection stop valve, a gas supply regulating valve and a second inspection stop valve which are connected in sequence;

[0013] One end of the first inspection stop valve is connected to the gas supply switch valve, and the other end is connected to the gas supply regulating valve; one end of the second inspection stop valve is connected to the gas supply regulating valve, and the other end is connected to the gas storage unit.

[0014] Further, the gas supply bypass includes a first bypass stop valve and a gas supply pressure transmitter;

[0015] One end of the first bypass stop valve is connected to the gas supply switch valve, and the other end is connected to the gas storage unit;

[0016] The gas supply pressure transmitter is arranged between the first bypass stop valve and the gas supply switch valve, and is used to monitor the gas supply pressure.

[0017] Further, the gas storage unit includes a gas storage tank;

[0018] The inlet of the gas storage tank is communicated with the outlet of the gas supply unit, and the outlet is communicated with the gas distribution unit.

[0019] Furthermore, the gas storage unit also includes a gas storage pressure transmitter;

[0020] The gas storage pressure transmitter is arranged between the gas storage tank and the gas separation unit, and is used to monitor the outlet pressure of the gas storage tank.

[0021] Furthermore, the gas separation unit includes a gas separation switch valve and a gas separation pipeline;

[0022] One end of the gas separation switch valve is connected to the gas storage unit, and the other end is connected to the inlet of the gas separation pipeline, and the outlet of the gas separation pipeline is connected to the denitration nozzle;

[0023] The gas distribution pipeline includes a gas distribution main pipeline and a gas distribution bypass pipeline which are arranged in parallel.

[0024] Furthermore, the main gas distribution line includes a third inspection stop valve, a branch control valve, a branch flow meter and a fourth inspection stop valve which are connected in sequence;

[0025] One end of the third inspection stop valve is communicated with the outlet of the gas storage unit, and the other end is communicated with the branch regulating valve.

[0026] Furthermore, the gas separation bypass includes a second bypass stop valve, one end of the second bypass stop valve is connected to the gas separation switch valve, and the other end is connected to the denitrification nozzle.

[0027] Furthermore, the gas separation unit also includes a gas separation pressure transmitter;

[0028] The gas distribution pressure transmitter is arranged between the gas distribution pipeline and the denitrification nozzle, and is used to monitor the gas supply pressure.

[0029] Based on the above technical solutions, the technical effects that can be achieved by the utility model are:

[0030] The utility model provides a furnace denitration and ammonia supply system comprising a gas supply unit, a gas storage unit and a gas separation unit; the inlet of the gas storage unit is connected with the outlet of the gas supply unit, the outlet of the gas storage unit is connected with the inlet of the gas separation unit, and the outlet of the gas separation unit is connected with the denitration nozzle; a plurality of gas separation units are arranged in parallel and correspond one to one with the furnace.

[0031] The furnace denitration ammonia supply system provided by the utility model realizes the division of one gas supply unit into multiple gas sources corresponding to the number of furnaces by setting up multiple gas distribution units, avoiding the setting of gas supply units equal to the number of furnaces, reducing the pipeline setting, reducing the floor space, and reducing the investment and construction costs, which is conducive to the centralized management of ammonia supply and reducing the construction and use costs. At the same time, a gas storage unit is set between the gas supply unit and the gas distribution unit, which is conducive to stabilizing the ammonia supply pressure, ensuring that after one gas supply unit is divided into multiple gas distribution units, ammonia gas with stable pressure can be provided to the gas distribution unit, thereby ensuring the stability of the flue gas denitration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic structural diagram of a furnace denitrification and ammonia supply system provided in an embodiment of the utility model.

[0034] Icons: 10, gas supply unit; 20, gas storage unit; 30, gas distribution unit; 100, gas supply switch valve; 200, gas supply pipeline; 300, gas storage tank; 400, gas storage pressure transmitter; 500, gas distribution switch valve; 600, gas distribution pipeline; 700, gas distribution pressure transmitter; 210, gas supply main line; 220, gas supply bypass; 211, first maintenance stop valve; 212, gas supply regulating valve; 213, second maintenance stop valve; 221, first bypass stop valve; 222, gas supply pressure transmitter; 610, gas distribution main line; 620, gas distribution bypass; 611, third maintenance stop valve; 612, branch regulating valve; 613, branch flowmeter; 614, fourth maintenance stop valve; 621, second bypass stop valve. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] In the actual production process, each furnace flue gas denitrification ammonia supply system is an independent control system. If there are several furnaces in the factory, several denitrification ammonia supply systems will be established, resulting in many pipelines, large floor space, high investment and construction costs and unfavorable centralized management.

[0039] In view of this, the utility model provides a furnace denitrification ammonia supply system including an air supply unit 10, an air storage unit 20 and an air separation unit 30; the inlet of the air storage unit 20 is connected to the outlet of the air supply unit 10, the outlet of the air storage unit 20 is connected to the inlet of the air separation unit 30, and the outlet of the air separation unit 30 is connected to the denitrification nozzle; multiple air separation units 30 are arranged in parallel and correspond one to one to the furnace.

[0040] The furnace denitration ammonia supply system provided by the utility model realizes the division of a gas supply unit 10 into multiple gas sources corresponding to the number of furnaces by setting up multiple gas distribution units 30, avoiding the setting of gas supply units 10 equal to the number of furnaces, reducing the pipeline setting, reducing the floor space, and reducing the investment and construction costs, which is conducive to the centralized management of ammonia supply and reducing the construction and use costs. At the same time, the gas storage unit 20 is set between the gas supply unit 10 and the gas distribution unit 30, which is conducive to stabilizing the ammonia supply pressure, ensuring that after one gas supply unit 10 is divided into multiple gas distribution units 30, ammonia with stable pressure can be provided to the gas distribution unit 30, thereby ensuring the stability of the flue gas denitration effect.

[0041] The following combination Figure 1 The structure and shape of the furnace denitration and ammonia supply system provided in this embodiment are described in detail:

[0042] In an optional scheme of this embodiment, the gas supply unit 10 includes a gas supply switch valve 100 and a gas supply pipeline 200, one end of the gas supply pipeline 200 is connected to the outlet of the gas supply switch valve 100, and the other end is connected to the gas storage unit 20; the inlet of the gas supply switch valve 100 is connected to the ammonia gas source for controlling the on and off of the ammonia gas source.

[0043] The gas supply pipeline 200 includes a gas supply main pipeline 210 and a gas supply bypass 220 arranged in parallel. The gas supply main pipeline 210 includes a first maintenance stop valve 211, a gas supply regulating valve 212 and a second maintenance stop valve 213 which are connected in sequence; one end of the first maintenance stop valve 211 is connected to the gas supply switch valve 100, and the other end is connected to the gas supply regulating valve 212; one end of the second maintenance stop valve 213 is connected to the gas supply regulating valve 212, and the other end is connected to the gas storage unit 20. The gas supply regulating valve 212 is used to control the pressure of its downstream pipeline to improve the regulation sensitivity of each pipeline of the gas distribution unit 30. When the gas supply regulating valve 212 is inspected, the first maintenance stop valve 211 and the second maintenance stop valve 213 are closed.

[0044] The gas supply bypass 220 includes a first bypass stop valve 221 and a gas supply pressure transmitter 222. One end of the first bypass stop valve 221 is connected to the gas supply switch valve 100, and the other end is connected to the gas storage unit 20. When the gas supply regulating valve 212 in the gas supply main line 210 fails, the first bypass stop valve 221 opens to connect the gas supply bypass 220. At this time, ammonia gas passes through the gas supply switch valve 100 and the first bypass stop valve 221 in sequence and then directly enters the gas storage unit 20; the gas supply pressure transmitter 222 is arranged between the first bypass stop valve 221 and the gas supply switch valve 100, and is used to monitor the gas supply pressure.

[0045] In the optional scheme of this embodiment, the gas storage unit 20 includes a gas tank 300 and a gas storage pressure transmitter 400. Specifically, the inlet of the gas tank 300 is connected to the outlet of the gas supply unit 10, and the outlet is connected to the gas separation unit 30, which is used to provide a gas source of ammonia with a stable pressure to each gas separation unit 30. That is, the inlet of the gas tank 300 is connected to the second maintenance stop valve 213 and the first bypass stop valve 221. The gas storage pressure transmitter 400 is arranged between the gas tank 300 and the gas separation unit 30, and is used to monitor the outlet pressure of the gas tank 300, so that the pressure regulation effect of the gas supply regulating valve 212 can be fed back in real time, so as to facilitate timely adjustment.

[0046] In the optional scheme of this embodiment, the gas separation unit 30 includes a gas separation switch valve 500, a gas separation pipeline 600 and a gas separation pressure transmitter 700. One end of the gas separation switch valve 500 is connected to the outlet of the gas storage tank 300, and the other end is connected to the inlet of the gas separation pipeline 600, which is used to control the connection and disconnection of the gas separation pipeline 600 and the gas storage tank 300 to control the supply of ammonia; the outlet of the gas separation pipeline 600 is connected to the denitration nozzle; the gas separation pressure transmitter 700 is arranged between the gas separation pipeline 600 and the denitration nozzle, and is used to monitor the gas supply pressure of the gas separation pipeline 600, so as to facilitate timely adjustment of the gas supply pressure.

[0047] Specifically, the gas distribution pipeline 600 includes a gas distribution main pipeline 610 and a gas distribution bypass 620 arranged in parallel. The gas distribution main pipeline 610 includes a third inspection stop valve 611, a branch control valve 612, a branch flow meter 613 and a fourth inspection stop valve 614 which are connected in sequence. One end of the third inspection stop valve 611 is connected to the outlet of the gas storage tank 300, and the other end is connected to the branch control valve 612. The gas storage pressure transmitter 400 is arranged between the gas storage tank 300 and the gas distribution switch valve 500; the inlet of the fourth inspection stop valve 614 is connected to the branch flow meter 613, and the outlet is connected to the denitrification nozzle.

[0048] The branch regulating valve 612 is used to regulate the ammonia flow rate of its downstream pipeline, and the branch flow meter 613 is used to measure the ammonia flow rate of the branch gas main pipeline 610. When the pressure value fed back by the branch gas pressure transmitter 700 or the flow data of the branch flow meter 613 exceeds the use requirement, the branch regulating valve 612 can be adjusted; when the branch regulating valve 612 and the branch flow meter 613 need to be repaired, the third inspection stop valve 611 and the fourth inspection stop valve 614 are closed.

[0049] The gas separation bypass 620 includes a second bypass stop valve 621, one end of the second bypass stop valve 621 is connected to the gas separation switch valve 500, and the other end is connected to the denitration nozzle. When the branch regulating valve 612 fails, the second bypass stop valve 621 opens to connect the gas separation bypass 620. At this time, ammonia passes through the gas separation switch valve 500 and the second bypass stop valve 621 in sequence to supply gas to the denitration nozzle.

[0050] In this embodiment, the gas supply switch valve 100 and the gas distribution switch valve 500 can be configured as pneumatic butterfly valves or electric butterfly valves to facilitate automatic control of the on and off of the gas source.

[0051] In this embodiment, the gas supply regulating valve 212 and the branch regulating valve 612 can be set as pneumatic regulating valves or electric regulating valves to automatically adjust the gas supply flow and pressure of the downstream pipeline.

[0052] The working process of the furnace denitration and ammonia supply system provided in this embodiment is as follows:

[0053] Ammonia enters the gas supply pipeline 200 from the gas source through the gas supply switch valve 100. The gas supply pipeline 200 is divided into two parallel branches: the gas supply main pipeline 210 and the gas supply bypass 220. Under normal circumstances, ammonia enters the gas storage tank 300 through the gas supply main pipeline 210. At this time, the DCS system controls the gas supply regulating valve 212 to adjust the ammonia gas pressure in real time to keep the pressure value at the set value. The pressure adjustment of the gas supply regulating valve 212 can make the inlet pressure of each gas distribution unit 30 variable, thereby increasing the adjustment margin of the branch regulating valve 612, avoiding the pressure adjustment demand exceeding the adjustment capacity of the branch regulating valve 612, and at the same time helping to improve the pressure adjustment accuracy.

[0054] When the gas supply regulating valve 212 fails, the first inspection stop valve 211 and the second inspection stop valve 213 are closed, the first bypass stop valve 221 is opened, and ammonia enters the gas storage tank 300 from the gas supply bypass 220. Here, the gas supply pressure transmitter 222 can provide the system with real-time gas supply pressure so that the subsequent branch regulating valve 612 can make timely adjustments to ensure pressure stability.

[0055] The gas storage tank 300 is used to ensure stable pressure and store a certain amount of ammonia to cope with the situation of gas source disconnection, thereby leaving reaction time for related operations and preventing smoke from being discharged without treatment.

[0056] After passing through the gas storage tank 300, the ammonia gas is divided into gas distribution units 30 equal to the number of kilns according to the number of kilns. Each gas distribution unit 30 is divided into two branches, namely, a gas distribution main line 610 and a gas distribution bypass 620 connected in parallel. Under normal circumstances, the ammonia gas enters the denitration nozzle through the gas distribution main line 610. At this time, the DCS system controls the opening of the branch regulating valve 612 so that the detection value of the branch flow meter 613 is equal to the system setting value, thereby ensuring the denitration effect.

[0057] When a fault occurs in the branch regulating valve 612, the third inspection stop valve 611 and the fourth inspection stop valve 614 are closed, and ammonia enters the denitrification nozzle through the gas distribution switch valve 500 and the second bypass stop valve 621 in turn. At this time, the detection value of the branch flow meter 613 can be made equal to the system setting by adjusting the opening of the gas supply regulating valve 212.

[0058] It should be noted that both the gas supply regulating valve 212 and the branch regulating valve 612 can adjust the gas supply pressure and flow rate by adjusting the opening, and the two can cooperate with each other to improve the pressure and flow rate regulation capabilities. Among them, the gas supply regulating valve 212 is mainly used to regulate the pressure, and the branch regulating valve 612 is mainly used to regulate the flow rate. At the same time, the two can back up each other. When one of them has a problem, the other can adjust the pressure and flow rate, so that the system can maintain stable operation for a period of time, provide sufficient time for maintenance and replacement, and ensure the normal operation of flue gas treatment.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A furnace denitrification and ammonia supply system, characterized in that: It comprises an air supply unit (10), an air storage unit (20) and an air distribution unit (30); The inlet of the gas storage unit (20) is communicated with the outlet of the gas supply unit (10), the outlet of the gas storage unit (20) is communicated with the inlet of the gas separation unit (30), and the outlet of the gas separation unit (30) is communicated with the denitration nozzle; The plurality of gas separation units (30) are arranged in parallel and correspond one to one with the furnaces.

2. The furnace denitration and ammonia supply system according to claim 1, characterized in that: The gas supply unit (10) comprises a gas supply switch valve (100) and a gas supply pipeline (200); One end of the gas supply pipeline (200) is in communication with the gas supply switch valve (100), and the other end is in communication with the gas storage unit (20); The gas supply pipeline (200) comprises a gas supply main pipeline (210) and a gas supply bypass pipeline (220) which are arranged in parallel.

3. The furnace denitration and ammonia supply system according to claim 2, characterized in that: The main gas supply line (210) comprises a first maintenance stop valve (211), a gas supply regulating valve (212) and a second maintenance stop valve (213) which are connected in sequence; One end of the first inspection stop valve (211) is connected to the gas supply switch valve (100), and the other end is connected to the gas supply regulating valve (212); one end of the second inspection stop valve (213) is connected to the gas supply regulating valve (212), and the other end is connected to the gas storage unit (20).

4. The furnace denitration and ammonia supply system according to claim 3, characterized in that: The gas supply bypass (220) comprises a first bypass stop valve (221) and a gas supply pressure transmitter (222); One end of the first bypass stop valve (221) is in communication with the gas supply switch valve (100), and the other end is in communication with the gas storage unit (20); The gas supply pressure transmitter (222) is arranged between the first bypass stop valve (221) and the gas supply switch valve (100) and is used to monitor the gas supply pressure.

5. The furnace denitration and ammonia supply system according to claim 1, characterized in that: The gas storage unit (20) comprises a gas storage tank (300); The inlet of the gas storage tank (300) is in communication with the outlet of the gas supply unit (10), and the outlet is in communication with the gas separation unit (30).

6. The furnace denitration and ammonia supply system according to claim 5, characterized in that: The gas storage unit (20) further comprises a gas storage pressure transmitter (400); The gas storage pressure transmitter (400) is arranged between the gas storage tank (300) and the gas separation unit (30) and is used to monitor the outlet pressure of the gas storage tank (300).

7. The furnace denitration and ammonia supply system according to claim 6, characterized in that: The gas separation unit (30) comprises a gas separation switch valve (500) and a gas separation pipeline (600); One end of the gas separation switch valve (500) is in communication with the gas storage unit (20), and the other end is in communication with the inlet of the gas separation pipeline (600); the outlet of the gas separation pipeline (600) is in communication with the denitration nozzle; The gas distribution pipeline (600) comprises a gas distribution main pipeline (610) and a gas distribution bypass pipeline (620) which are arranged in parallel.

8. The furnace denitration and ammonia supply system according to claim 7, characterized in that: The main gas distribution line (610) comprises a third inspection stop valve (611), a branch regulating valve (612), a branch flow meter (613) and a fourth inspection stop valve (614) which are connected in sequence; One end of the third inspection stop valve (611) is in communication with the outlet of the gas storage unit (20), and the other end is in communication with the branch regulating valve (612).

9. The furnace denitration and ammonia supply system according to claim 8, characterized in that: The gas separation bypass (620) comprises a second bypass stop valve (621), one end of the second bypass stop valve (621) is connected to the gas separation switch valve (500), and the other end of the second bypass stop valve (621) is connected to the denitration nozzle.

10. The furnace denitration and ammonia supply system according to claim 9, characterized in that: The gas separation unit (30) further includes a gas separation pressure transmitter (700); The gas distribution pressure transmitter (700) is arranged between the gas distribution pipeline (600) and the denitration nozzle, and is used to monitor the gas supply pressure.

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