Standby ejection steam source and nitrogen source system for full recovery of damping-down gas

Abstract

The utility model discloses a standby ejection steam source and nitrogen source system for full recovery of damping-down gas, which is characterized in that the gas inlet end of a gas inlet pipeline is connected with a clean gas pipe network, and a buffer tank is arranged at the gas outlet end of the gas inlet pipeline; the damping down ejector is connected with the air outlet end of the buffer tank; the air outlet end of the dry method treatment management device is connected with the air inlet end of the damping down ejector; the air outlet end of the steam pipeline is connected with the air inlet end of the damping-down ejector, and a plurality of diffusing ends are arranged on the steam pipeline; the gas outlet end of the nitrogen pipeline is connected with the gas inlet end of the damping-down ejector, and a plurality of diffusing ends are arranged on the nitrogen pipeline; the gas outlet end of the gas pipeline is connected with the gas inlet end of the damping-down ejector, and a plurality of diffusing ends are arranged on the gas pipeline. The parallel multi-source pipeline is connected with the damping-down ejector, the capability of adapting to various different components, performances and pressure grades is achieved, damping-down diffused gas is recycled as much as possible, meanwhile, the reliability of the damping-down process is guaranteed, and emission of carbon monoxide is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of coal gas recovery technology, and in particular relates to a backup ejector steam source and nitrogen source system for the complete recovery of coal gas during shutdown. Background Technology

[0002] During blast furnace smelting, the blast furnace shut-off gas is typically released directly into the atmosphere. This shut-off gas is a toxic, combustible mixture containing large amounts of CO, CO2, and dust, causing air pollution and wasting energy. During blast furnace maintenance and shut-off venting, a large amount of dust-laden gas is generated and directly emitted into the atmosphere, severely impacting the environment. While full blast shut-off gas recovery technology exists, it suffers from issues such as incomplete recovery at the end of the recovery process, unsuitable gas conditions, or process limitations preventing proper venting. Directly opening the venting valve would result in partial venting into the atmosphere. Therefore, the process design uses blast furnace gas as the main ejector gas. However, when the blast furnace gas quality is substandard, using blast furnace gas as the ejector gas is wasteful and can lead to excessive carbon monoxide emissions. Utility Model Content

[0003] The purpose of this invention is to provide a backup ejector steam source and nitrogen source system for the full recovery of idle coal gas, so as to solve the technical problems of insufficient recovery and excessive carbon monoxide.

[0004] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:

[0005] In some embodiments of this application, a backup ejector steam source and nitrogen source system for the complete recovery of idle gas are provided, including:

[0006] An air intake pipe is provided, wherein the air intake end of the air intake pipe is connected to the clean coal gas pipeline network, and a buffer tank is provided on the air outlet end.

[0007] A wind-retaining ejector, which is connected to the outlet of the buffer tank;

[0008] The dry treatment pipeline is connected to the air inlet of the dry treatment pipeline.

[0009] A steam pipeline, the outlet of which is connected to the inlet of the air ejector, and is provided with several venting ends.

[0010] A nitrogen pipeline, the outlet of which is connected to the inlet of the air ejector, and is provided with several venting ends.

[0011] A gas pipeline, the gas outlet of which is connected to the gas inlet of the ventilation ejector, and is provided with several venting ends.

[0012] In some embodiments of this application, the intake pipe has a combined structure, including:

[0013] The first pipeline has one end connected to the clean gas pipeline network via a manual gate valve and the other end connected to the buffer tank. It is equipped with a pneumatic butterfly valve and an electric blind flange, and a venting pipeline is provided between the pneumatic butterfly valve and the electric blind flange.

[0014] The second pipeline has one end connected to the pneumatic butterfly valve on the first pipeline, and the other end connected to the first pipeline through a pneumatic vent valve, and is connected to the nitrogen pipeline through a control valve.

[0015] A nitrogen purging valve is provided between the first pipeline and the second pipeline, and the nitrogen purging valve is respectively located on both sides of the electric blind flange.

[0016] In some embodiments of this application, the dry treatment pipeline has a combined structure, including:

[0017] A dry inlet manifold, wherein the air inlet end of the dry inlet manifold is connected to an external air source, and the air outlet end is provided with dry processing components arranged in parallel.

[0018] A dry process outlet manifold, wherein the air inlet end of the dry process outlet manifold is connected to the air outlet end of the dry process treatment component;

[0019] The third pipeline has its inlet end connected to the outlet end of the dry method outlet main pipe. A gas analyzer is installed on the outlet end, and the outlet end of the gas analyzer is connected to the inlet end of the air-cooled launcher. An electric blind flange and a pneumatic butterfly valve are installed on the third pipeline, and a nitrogen pipeline is installed on the pneumatic butterfly valve. Venting ends are respectively provided on both sides of the electric blind flange on the third pipeline. The nitrogen pipeline is connected to the third pipeline through valves, and its purging ends are respectively located between the electric blind flange and the venting pipeline.

[0020] In some embodiments of this application, the dry processing component is a modular structure, including:

[0021] A dry inlet valve assembly, wherein the inlet end of the dry inlet valve assembly is connected to the dry inlet manifold;

[0022] The reused dry process chamber is connected to the air outlet of the dry process inlet valve assembly.

[0023] The dry process outlet valve assembly has its inlet end connected to the outlet end of the reused dry process housing, and its outlet end connected to the inlet end of the dry process outlet main pipe.

[0024] In some embodiments of this application, the steam pipeline has a combined structure, including:

[0025] The fourth pipeline has one end connected to a steam source and the other end connected to a venting ejector. It is equipped with a pneumatic ejector valve, an electric blind flange, and a pneumatic butterfly valve, and venting pipelines are provided on both sides of the electric blind flange.

[0026] The fifth pipeline has one end connected to the pneumatic butterfly valve of the fourth pipeline, and the other end connected to the nitrogen pipeline through a valve, and then connected to the pneumatic ejector valve through a valve.

[0027] In some embodiments of this application, the nitrogen pipeline has a combined structure, including:

[0028] The sixth pipeline has one end connected to a nitrogen source and the other end connected to a nitrogen tank, and is equipped with a first manual butterfly valve.

[0029] The seventh pipeline has one end connected to a nitrogen tank and the other end connected to a blower ejector. A check valve is installed on the seventh pipeline, and second manual butterfly valves are installed on both sides of the check valve. A venting pipeline is installed between the second manual butterfly valves and the check valve. An electric ball valve is also installed on the portion of the seventh pipeline away from the nitrogen tank. A pneumatic ejector valve is installed on one side of the electric ball valve, and a pneumatic butterfly valve is installed on the other side. A venting pipeline is installed between the electric ball valve and the pneumatic ejector valve and the pneumatic butterfly valve. Valves are connected to air supply lines on the pneumatic ejector valve and the pneumatic butterfly valve.

[0030] In some embodiments of this application, a safety valve is provided on the nitrogen tank.

[0031] In some embodiments of this application, the gas pipeline has a combined structure, including:

[0032] The eighth pipeline has one end connected to a gas source and the other end connected to a ventilation ejector.

[0033] The eighth pipeline is equipped with a blind flange, and a butterfly valve and a pneumatic ejector valve are respectively installed on both sides of the blind flange. A venting pipeline is also provided between the blind flange and the butterfly valve and the pneumatic ejector valve.

[0034] Compared with existing technologies, the advantages of this invention lie in its ability to adapt to various compositions, properties, and pressure levels by using parallel multi-source pipelines connected to the shutdown ejector. This ensures maximum recovery of shutdown vented gas while maintaining the reliability of the shutdown process and reducing carbon monoxide emissions. The overall system fully recovers shutdown blast furnace gas, effectively achieving in-furnace pressure reduction during shutdowns when the gas is substandard, while minimizing carbon monoxide emissions and ensuring the reliability of the shutdown system. This technology is more mature than existing technologies and avoids environmental pollution and shutdown delays caused by secondary emissions. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0036] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0037] Figure 2 This is a schematic diagram of the intake pipe structure provided in an embodiment of the present utility model;

[0038] Figure 3 A schematic diagram of the dry treatment pipeline structure provided in this embodiment of the utility model;

[0039] Figure 4 This is a schematic diagram of the third pipeline structure provided in an embodiment of the present utility model;

[0040] Figure 5 This is a schematic diagram of the steam pipeline structure provided in an embodiment of the present utility model;

[0041] Figure 6 This is a schematic diagram of the structure of a nitrogen pipeline provided in an embodiment of the present invention;

[0042] Figure 7 A schematic diagram of a gas pipeline structure provided for an embodiment of this utility model. Detailed Implementation

[0043] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0044] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0045] See appendix Figures 1-7 As shown, according to the embodiments of this application, it includes:

[0046] Air inlet pipe 1, the air inlet end of which is connected to the clean coal gas pipeline network, and the air outlet end is equipped with a buffer tank;

[0047] It should be noted that intake pipe 1 is a modular structure, including:

[0048] The first pipeline 101 has one end connected to the clean gas pipeline network via a manual gate valve and the other end connected to the buffer tank. It is equipped with a pneumatic butterfly valve and an electric blind flange, and a venting pipeline is provided between the pneumatic butterfly valve and the electric blind flange.

[0049] The second pipeline 102 has one end connected to the pneumatic butterfly valve on the first pipeline 101, and the other end connected to the first pipeline 101 through a pneumatic vent valve, and is connected to the nitrogen pipeline through a control valve.

[0050] A nitrogen purging valve is provided between the first pipeline 101 and the second pipeline 102, and the nitrogen purging valve is respectively located on both sides of the electric blind plate.

[0051] Air ejector 2, which is connected to the air outlet of the buffer tank;

[0052] The dry treatment pipeline 3 is connected to the air inlet of the air ejector 2 at its outlet. It should be noted that the dry treatment pipeline 3 is a modular structure, comprising:

[0053] Dry inlet manifold 201, the air inlet end of which is connected to an external air source, and the air outlet end of which is provided with dry processing components 203 arranged in parallel.

[0054] Dry process outlet manifold 202, the air inlet of which is connected to the air outlet of dry process processing component 203;

[0055] The third pipeline 204 has its inlet end connected to the outlet end of the dry outlet main pipe 202. A gas analyzer is installed on its outlet end, and the outlet end of the gas analyzer is connected to the inlet end of the air-cooled launcher. An electric blind flange and a pneumatic butterfly valve are installed on it, and a nitrogen pipeline is installed on the pneumatic butterfly valve of the third pipeline 204. Venting ends are respectively provided on both sides of the electric blind flange of the third pipeline 204. The nitrogen pipeline is connected to the third pipeline 204 through valves, and its purging end is respectively located between the electric blind flange and the venting pipeline.

[0056] The dry processing component 203 is a modular structure, including:

[0057] Dry inlet valve assembly 2031, wherein the inlet end of the dry inlet valve assembly 2031 is connected to the dry inlet manifold 201;

[0058] The reused dry process chamber 2032 has its air inlet end connected to the air outlet end of the dry process inlet valve assembly 2031.

[0059] The dry process outlet valve assembly 2033 has its inlet end connected to the outlet end of the reused dry process housing 2032, and its outlet end connected to the inlet end of the dry process outlet manifold 202.

[0060] Steam pipe 4, the outlet of which is connected to the inlet of the air ejector 2, and is provided with several venting ends; it should be noted that steam pipe 4 is a modular structure, including:

[0061] The fourth pipeline 301 is connected at one end to a steam source and at the other end to a venting ejector 2. It is equipped with a pneumatic ejector valve, an electric blind flange and a pneumatic butterfly valve, and venting pipelines are provided on both sides of the electric blind flange.

[0062] The fifth pipeline 302 has one end connected to the pneumatic butterfly valve of the fourth pipeline 301, and the other end connected to the nitrogen pipeline through a valve, and is also connected to the pneumatic ejector valve through a valve.

[0063] Nitrogen pipeline 5, the outlet of which is connected to the inlet of the air ejector 2, and is provided with several venting ends; it should be noted that nitrogen pipeline 5 is a modular structure, including:

[0064] The sixth pipeline 401 is connected at one end to a nitrogen source and at the other end to a nitrogen tank 402 (which is equipped with a safety valve), and is equipped with a first manual butterfly valve.

[0065] The seventh pipeline 403 is connected at one end to the nitrogen tank 402 and at the other end to the air ejector 2. A check valve is installed on the pipeline, and second manual butterfly valves are installed on both sides of the check valve. A venting pipeline is provided between the second manual butterfly valves and the check valve. An electric ball valve is also installed on the portion of the seventh pipeline 403 away from the nitrogen tank 402. A pneumatic ejector valve is installed on one side of the electric ball valve, and a pneumatic butterfly valve is installed on the other side. A venting pipeline is provided between the electric ball valve and the pneumatic ejector valve and the pneumatic butterfly valve. A valve air pipeline is provided on each of the pneumatic ejector valve and the pneumatic butterfly valve.

[0066] Gas pipeline 6, the outlet of which is connected to the inlet of the ventilation ejector 2, and is provided with several venting ends. It should be noted that gas pipeline 6 is a modular structure, comprising:

[0067] The eighth pipeline 501 is connected at one end to a gas source and at the other end to a ventilation ejector 2.

[0068] The eighth pipeline 501 is equipped with a blind plate, and a butterfly valve and a pneumatic ejector valve are respectively installed on both sides of the blind plate. A venting pipeline is also provided between the blind plate and the butterfly valve and the pneumatic ejector valve.

[0069] The core working principle of this idle gas full recovery backup ejector system is to achieve a dynamic balance between efficient gas recovery and safe emission through multi-source gas path coordinated control, dry purification treatment, and intelligent switching mechanisms. The specific workflow is as follows:

[0070] I. System Core Component Collaboration Mechanism

[0071] Intake line 1 and buffer pressure regulator

[0072] Clean coal gas enters the buffer tank through the first pipeline 101 (controlled by a pneumatic butterfly valve and an electric blind flange) to stabilize pressure fluctuations.

[0073] The second pipeline 102 serves as a bypass, allowing for rapid pressure relief via a pneumatic venting valve in emergencies, and the introduction of nitrogen for purging (nitrogen purging valves on both sides of the electric blind flange) to ensure safety during pipeline switching.

[0074] Dry processing and quality monitoring

[0075] The coal gas is purified by parallel reuse dry process housing 2032 (such as dust removal and desulfurization units), and the flow rate is controlled by the dry process inlet / outlet valve group.

[0076] The processed coal gas is analyzed in real time by a gas analyzer in the third pipeline 204. If the composition is qualified, it enters the ejector for recovery; if it is not qualified, it triggers bypass emission, and at the same time, nitrogen is injected into the pipeline to dilute the CO concentration and reduce emission pollution.

[0077] Multi-source ejector power protection

[0078] Steam line 4: High-pressure steam drives the ejector through a pneumatic ejector valve, providing auxiliary power when the gas pressure is insufficient.

[0079] Nitrogen line 5: Nitrogen tank 402 (with safety valve) stores inert gas. Backflow is prevented by a check valve. The electric ball valve and pneumatic butterfly valve are interlocked and controlled. It serves as both an ejector medium and a system purging explosion-proof device.

[0080] Gas pipeline 6: As the main gas source, it is linked with the pneumatic ejector valve through a butterfly valve and is used preferentially when the gas quality meets the standards.

[0081] II. Dynamic Operating Condition Response Strategies

[0082] Normal operating conditions (gas quality qualified)

[0083] When the intake pipe 1 is connected, the buffer tank outputs stable coal gas to the ejector.

[0084] The coal gas processed by the dry method is confirmed to be qualified by an analyzer and then directly participates in the recovery process.

[0085] Steam / nitrogen line 5 is in standby mode, with the vent closed.

[0086] Abnormal operating conditions (insufficient gas pressure or substandard gas composition)

[0087] The gas analyzer triggers a signal to close the electric blind flange of gas pipeline 6 and open the nitrogen purging valve to remove residual gas.

[0088] The ejector is switched to steam or nitrogen as a power source to maintain negative pressure in the system and prevent gas backflow.

[0089] Substandard coal gas is discharged through the vent end of dry treatment pipeline 3, while nitrogen is injected to dilute CO to a safe concentration.

[0090] Emergency ventilation shutdown (requires rapid pressure reduction)

[0091] The pneumatic vent valve of the second pipeline 102 is interlocked with nitrogen to open, quickly depressurize and purge the pipeline.

[0092] The electric ball valve of nitrogen pipeline 5 is fully opened, allowing a large flow of nitrogen to enter the ejector, accelerating the replacement of gas in the furnace and preventing CO accumulation.

[0093] III. Safety and Environmental Protection Design Highlights

[0094] Multiple redundancy release

[0095] Each pipeline is equipped with a venting end (such as both sides of the electric blind flange of the third pipeline 204), and the pressure is controlled by staged discharge to avoid single point failure.

[0096] All released gases are diluted with nitrogen or treated by dry methods to reduce the risk of direct CO emissions.

[0097] Inert gas protection net

[0098] Nitrogen purging valves cover all critical nodes (such as both sides of the blind flange of intake line 1 and dry treatment line 3) to ensure explosion-proof safety during maintenance or switching.

[0099] The nitrogen tank 402 and check valve are designed to prevent backflow of the medium and maintain the inert environment of the system.

[0100] Intelligent valve interlock

[0101] The pneumatic butterfly valve, electric blind flange and gas analyzer are linked to realize automatic gas source switching (e.g., when the gas is not qualified, the gas pipeline 6 is shut off and the backup gas source is activated).

[0102] Pneumatic piping for valves (such as the seventh piping 403) ensures that pneumatic components can still be forced to operate in the event of a failure, thereby improving system reliability.

[0103] IV. Breakthroughs Compared to Existing Technologies

[0104] Multi-source adaptability

[0105] By using parallel injection of steam, nitrogen, and purified coal gas, the system can adapt to gas sources with different pressures and compositions, thus solving the problem of low recovery efficiency caused by a single gas source in traditional systems.

[0106] Closed-loop recycling and emission control

[0107] Dry treatment combined with a gas analyzer forms a quality feedback closed loop, enabling precise control of "recovery upon passing and treatment upon exceeding standards," thus avoiding indiscriminate emissions from traditional open-loop systems.

[0108] The fault-tolerant design utilizes existing dry-process chambers 2032 arranged in parallel, so that the remaining chambers can still operate when one chamber fails; the nitrogen tank 402 and the steam pipeline 4 serve as backups for each other, ensuring that the ejector power is not interrupted and reducing the delay of ventilation shutdown.

[0109] Assuming an emergency shutdown of the blast furnace: the system detects a sudden drop in gas pressure, and the gas analyzer shows excessive CO concentration. It automatically shuts off gas pipeline 6, initiates nitrogen purging, and simultaneously opens the steam ejector valve to maintain negative pressure in the ejector. The excessive gas is discharged through dry treatment pipeline 3, with nitrogen simultaneously injected to dilute it to environmental standards before release. Once the furnace pressure stabilizes, it switches to nitrogen ejection to replace the remaining gas, with no direct CO emissions throughout the process. This system, through dynamic coordination and intelligent control, achieves the triple goals of safety, environmental protection, and high efficiency, significantly outperforming traditional single-source passive emission schemes.

[0110] The technical effects achieved by the above technical solution in the embodiments of this application are as follows:

[0111] By configuring the idle air ejector 2 with the capability to adapt to several gas energy media with different compositions, performance and pressure levels, the recovered furnace gas is fully recovered through process relay. When the gas is unqualified, it is gradually switched to nitrogen ejector and steam ejector to maintain sufficient vacuum extraction capacity, and the emission will not cause excessive carbon monoxide emissions.

[0112] By redesigning the ejector, it can accommodate several different gas sources with varying compositions, performance, and pressure levels. During normal blast furnace shutdowns, for gas of acceptable quality, coal gas is used as the ejector source for full recovery. When the gas from the furnace top is unacceptable, nitrogen is used for ejection. This portion, lacking recovery capabilities, can be directly vented through the venting system. When the blast furnace air supply cannot be completely cut off due to blast furnace process limitations, resulting in high furnace top pressure that cannot be vented, and when nitrogen pressure drop is significant due to ejection time, affecting process capacity, steam is switched as the ejector source to ensure the continuous blast furnace shutdown extraction capacity of the shutdown system, maintaining shutdown conditions until conditions allow for the activation of the blast furnace shutdown venting system.

[0113] This system is integrated with a full recovery system for blast furnace gas during shutdowns, ensuring full recovery of blast furnace gas. When the gas is substandard, it effectively reduces pressure during shutdowns while minimizing carbon monoxide emissions, guaranteeing the reliability of the shutdown system. Compared to existing technologies, this system is more mature and avoids environmental pollution and shutdown delays caused by secondary emissions.

[0114] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0115] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0116] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0117] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0118] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A standby ejection steam source and nitrogen source system for a blow-off gas total recovery system, characterized in that, The application relates to a combined type dry process device for a coal gasifier, which comprises the following parts: an air inlet pipeline, the air inlet end of which is connected with a clean coal gas pipeline network, and a buffer tank is arranged at the air outlet end of the pipeline; a wind-off ejector, which is connected with the air outlet end of the buffer tank; a dry process pipeline, the air outlet end of which is connected with the air inlet end of the wind-off ejector; a steam pipeline, the air outlet end of which is connected with the air inlet end of the wind-off ejector, and a plurality of diffusion ends are arranged on the pipeline; a nitrogen pipeline, the air outlet end of which is connected with the air inlet end of the wind-off ejector, and a plurality of diffusion ends are arranged on the pipeline; a coal gas pipeline, the air outlet end of which is connected with the air inlet end of the wind-off ejector, and a plurality of diffusion ends are arranged on the pipeline.

2. The stand-by ejection steam and nitrogen source system with full exhaust gas recovery according to claim 1, characterized in that The air inlet pipeline is of a combined type, and comprises: a first pipeline, one end of which is connected with the clean coal gas pipeline network through a manual gate valve, the other end of which is connected with the buffer tank, a pneumatic butterfly valve and an electric blind plate are arranged on the first pipeline, and a diffusion pipeline is arranged between the pneumatic butterfly valve and the electric blind plate; a second pipeline, one end of which is connected with the pneumatic butterfly valve on the first pipeline, the other end of which is connected with the first pipeline through a pneumatic diffusion valve, and the second pipeline is connected with a nitrogen pipeline through a control valve. A nitrogen blowing valve is arranged between the first pipeline and the second pipeline, and the nitrogen blowing valve is arranged on the two sides of the electric blind plate respectively.

3. The stand-by ejection steam and nitrogen source system with full exhaust gas recovery according to claim 1, characterized in that, The dry process pipeline is of a combined type, and comprises: a dry process inlet header, the air inlet end of which is connected with an external air source, and dry process components are arranged in parallel at the air outlet end of the dry process inlet header; a dry process outlet header, the air inlet end of which is connected with the air outlet end of the dry process components respectively; a third pipeline, the air inlet end of which is connected with the air outlet end of the dry process outlet header, a gas analyzer is arranged at the air outlet end of the third pipeline, the air inlet end of the wind-off ejector is connected with the air outlet end of the gas analyzer, an electric blind plate and a pneumatic butterfly valve are arranged on the third pipeline, a nitrogen pipeline is arranged on the pneumatic butterfly valve of the third pipeline, diffusion ends are arranged on the two sides of the electric blind plate on the third pipeline respectively, and the blowing ends of the nitrogen pipeline are arranged between the electric blind plate and the diffusion pipeline.

4. The stand-by ejection steam and nitrogen source system with full exhaust gas recovery according to claim 3, characterized in that The dry process components are of a combined type, and comprise: a dry process inlet valve group, the air inlet end of which is connected with the dry process inlet header; a dry process box, the air inlet end of which is connected with the air outlet end of the dry process inlet valve group; a dry process outlet valve group, the air inlet end of which is connected with the air outlet end of the dry process box, and the air outlet end of the dry process outlet valve group is connected with the air inlet end of the dry process outlet header.

5. The stand-by ejection steam and nitrogen gas source system with full exhaust gas recovery according to claim 1, characterized in that, The steam pipeline is of a combined type, and comprises: a fourth pipeline, one end of which is connected with a steam source, the other end of which is connected with the wind-off ejector, a pneumatic ejector valve, an electric blind plate and a pneumatic butterfly valve are arranged on the fourth pipeline, and diffusion pipelines are arranged on the two sides of the electric blind plate; a fifth pipeline, one end of which is connected with the pneumatic butterfly valve of the fourth pipeline, the other end of which is connected with the nitrogen pipeline through a valve, and the fifth pipeline is connected with the pneumatic ejector valve through a valve.

6. The stand-by ejection steam and nitrogen gas source system with full exhaust gas recovery according to claim 1, characterized in that, The nitrogen pipeline is of a combined type, and comprises: The sixth pipeline has one end connected with the nitrogen source and the other end connected with the nitrogen tank, and is provided with a first manual butterfly valve; The seventh pipeline has one end connected with the nitrogen tank and the other end connected with the wind-off ejector, is provided with a check valve, and is provided with a second manual butterfly valve on both sides of the check valve and a diffusion pipeline between the second manual butterfly valve and the check valve. The part of the seventh pipeline far from the nitrogen tank is further provided with an electric ball valve, a pneumatic ejector valve on one side of the electric ball valve and a pneumatic butterfly valve on the other side. The electric ball valve is provided with a diffusion pipeline between the electric ball valve and the pneumatic ejector valve and the pneumatic butterfly valve. The pneumatic ejector valve and the pneumatic butterfly valve are respectively provided with a valve gas pipeline.

7. The stand-by ejection steam and nitrogen source system with full exhaust gas recovery according to claim 6, characterized in that The nitrogen tank is provided with a safety valve.

8. The stand-by ejection steam and nitrogen gas source system with full exhaust gas recovery according to claim 1, characterized in that, The coal gas pipeline has a combined structure and comprises: The eighth pipeline has one end connected with the coal gas source and the other end connected with the wind-off ejector. The eighth pipeline is provided with a blind plate, a butterfly valve and a pneumatic ejector valve on both sides of the blind plate, and is further provided with a diffusion pipeline between the blind plate and the butterfly valve and the pneumatic ejector valve.

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