Intelligent air quality management method and system for ammonia plant

Abstract

The application provides an intelligent air quality management method and system for an ammonia production plant, which monitors the oxygen concentration and ammonia concentration in the ammonia production plant through a gas monitoring unit; compares the oxygen concentration and ammonia concentration with preset oxygen concentration safety threshold and ammonia concentration safety threshold through a control unit, generates and issues a control instruction according to the comparison result, so as to control the oxygen production unit and the ventilation circulating unit in the ammonia production plant to operate according to the corresponding load of the control instruction; and connects a lightweight breathing terminal with the oxygen output interface of the oxygen production unit, uses the lightweight breathing terminal to obtain oxygen, realizes the establishment and maintenance of a dynamic balance system for the oxygen and ammonia concentrations in the ammonia production plant within the preset safety threshold range, and provides a convenient, sustainable and non-dependent mobile gas cylinder continuous oxygen supply mode for the staff in the ammonia gas leakage emergency state.

Description

Technical Field

[0001] This application relates to the field of industrial safety and environmental control, specifically to an intelligent air quality management method and system for an ammonia production workshop. Background Technology

[0002] In the production and operation of ammonia production workshops (ammonia stations) in thermal power plants, ammonia, as a toxic and harmful gas, always carries the risk of leakage, and the stability of oxygen concentration within the workshop is directly related to the safety of the workers. Currently, ammonia production workshops mainly rely on ventilation and circulation systems to regulate oxygen and ammonia concentrations to maintain a reasonable level of oxygen and ammonia in the workshop air. However, this system has a significant drawback: when ammonia leaks from valves or sensors in the pipelines, the existing ventilation and circulation system can only perform preliminary ammonia concentration regulation and cannot meet the continuous oxygen supply requirements under equipment leakage conditions.

[0003] Currently, maintenance personnel must wear backpack positive pressure breathing apparatus containing oxygen cylinders for emergency repairs. However, this method has the following technical problems: the oxygen cylinders are bulky and inconvenient to carry, which severely limits the operational flexibility of maintenance personnel and affects the repair efficiency of complex leak points; the effective oxygen supply time is only 1-3 hours, requiring frequent interruptions of work to go out and change cylinders, resulting in delays in maintenance progress; at the same time, there is a risk of collision and leakage during the handling of oxygen cylinders, which further increases the safety hazards of the operation.

[0004] Furthermore, existing technologies lack a systematic design for the specific spatial layout and operational processes of ammonia production workshops, relying solely on a single ventilation system and failing to achieve coordinated control of environmental concentration and personnel life protection. In ammonia leakage scenarios, this fragmented system architecture makes it difficult to quickly control ammonia diffusion and also fails to provide stable and convenient oxygen supply support for maintenance personnel, ultimately affecting the safe and stable operation of the ammonia station and boiler denitrification system. Summary of the Invention

[0005] This application provides an intelligent air quality management method and system for an ammonia production workshop, which can effectively establish and maintain a dynamic balance between oxygen and ammonia concentrations within a safe threshold range in the ammonia production workshop. This provides a convenient, sustainable, and continuous oxygen supply method that does not rely on mobile gas cylinders, thereby improving the flexibility, continuity, and overall work efficiency of maintenance personnel.

[0006] In a first aspect, embodiments of this application provide an intelligent air quality management method for an ammonia production workshop, the intelligent air quality management method for the ammonia production workshop comprising: The oxygen and ammonia concentrations in the ammonia production workshop are monitored using a gas monitoring unit. The control unit compares the oxygen and ammonia concentrations with preset safe thresholds for oxygen and ammonia concentrations, generates and issues control commands based on the comparison results, and controls the oxygen production unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands. Oxygen is obtained by connecting the lightweight breathing terminal to the oxygen output interface of the oxygen generating unit.

[0007] In conjunction with the first aspect, in one implementation method: The oxygen concentration safety threshold includes an upper limit threshold and a lower limit threshold for oxygen concentration. The ammonia concentration safety threshold includes a daily ammonia inspection threshold, a daily ammonia warning threshold, and an ammonia leak alarm threshold, wherein the daily ammonia inspection threshold, the daily ammonia warning threshold, and the ammonia leak alarm threshold increase sequentially.

[0008] In conjunction with the first aspect, in one embodiment, the step of comparing the oxygen and ammonia concentrations with preset safe thresholds for oxygen and ammonia concentrations via a control unit, and generating and issuing control commands based on the comparison results to control the oxygen generation unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands, further includes: If the ammonia concentration is less than or equal to the ammonia daily inspection threshold during the calibrated daytime period, and less than or equal to the ammonia daily warning threshold during the calibrated nighttime period, and the oxygen concentration is between the upper limit threshold and the lower limit threshold of oxygen concentration, then a first control command is generated and issued to control the oxygen generation unit and the ventilation circulation unit to operate at a preset base load. If the oxygen concentration is less than the lower limit threshold of oxygen concentration, a second control command is generated and issued to control the oxygen generating unit to increase its operating load until the oxygen concentration is greater than or equal to the first recovery value. If the ammonia concentration is greater than the daily ammonia inspection threshold and less than or equal to the ammonia leak alarm threshold during the daytime period, greater than the daily ammonia warning threshold and less than or equal to the ammonia leak alarm threshold during the nighttime period, and / or the oxygen concentration is greater than the upper limit threshold of oxygen concentration, then a third control command is generated and issued to control the ventilation circulation unit to increase its operating load until the ammonia concentration is less than or equal to a preset second recovery value and the oxygen concentration is less than or equal to a preset third recovery value. Wherein, the first recovery value is greater than the lower limit threshold of oxygen concentration, the second recovery value is equal to the daily inspection threshold of ammonia, and the third recovery value is less than the upper limit threshold of oxygen concentration.

[0009] In conjunction with the first aspect, in one embodiment, the step of comparing the oxygen and ammonia concentrations with preset safe thresholds for oxygen and ammonia concentrations via a control unit, and generating and issuing control commands based on the comparison results to control the oxygen generation unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands, includes: If the ammonia concentration is greater than the ammonia leak alarm threshold, a fourth control command is generated and issued to control the oxygen generation unit and the ventilation circulation unit to operate at maximum load until the ammonia concentration is less than the ammonia daily warning threshold.

[0010] In conjunction with the first aspect, in one implementation, the method further includes: When the ammonia concentration exceeds the ammonia leak alarm threshold, the control unit activates the audible and visual alarm.

[0011] Secondly, embodiments of this application provide an intelligent air quality management system for an ammonia production workshop, which is used to perform the method described in any of the above. The system includes: a control unit, a gas monitoring unit electrically connected to the control unit, an oxygen production unit and a ventilation circulation unit, and a lightweight breathing terminal. The gas monitoring unit is used to collect the oxygen and ammonia concentrations in the ammonia production workshop. The control unit is used to compare the oxygen concentration and ammonia concentration with preset oxygen concentration safety thresholds and ammonia concentration safety thresholds, generate and issue control commands based on the comparison results, so as to control the oxygen production unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands; The oxygen generation unit also includes an oxygen output interface, which is configured to obtain oxygen using the lightweight breathing terminal when connected to it.

[0012] In conjunction with the second aspect, in one embodiment, the gas monitoring unit includes: At least one oxygen sensor for monitoring oxygen concentration and at least one ammonia sensor for monitoring ammonia concentration are provided in the pipeline area, pre-marked potential leak points and / or inspection path areas of the ammonia production workshop.

[0013] In conjunction with the second aspect, in one embodiment, the oxygen generating unit includes: An oxygen generator, an oxygen delivery pipeline connected to the oxygen outlet of the oxygen generator, and multiple oxygen output interfaces distributed on the oxygen delivery pipeline; The oxygen delivery pipelines are distributed along the walls of the ammonia production workshop at pre-marked potential leak points and / or inspection route areas.

[0014] In conjunction with the second aspect, in one embodiment, the lightweight breathing terminal includes: a positive pressure breathing shield, a breathing valve, and an oxygen inhalation tubing; The oxygen inhalation tubing includes a quick connector adapted to the oxygen output interface, and the positive pressure respirator is configured to be detachably connected to the oxygen output interface via the oxygen inhalation tubing.

[0015] In conjunction with the second aspect, in one embodiment, the ventilation circulation unit includes at least one industrial axial flow fan, which is located at the ventilation opening of the ammonia production workshop.

[0016] The intelligent air quality management method and system for an ammonia production workshop provided in this application embodiment monitors the oxygen and ammonia concentrations in the ammonia production workshop through a gas monitoring unit; the control unit compares the oxygen and ammonia concentrations with preset safe thresholds for oxygen and ammonia concentrations, and generates and issues control commands based on the comparison results to control the oxygen generation unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands; and oxygen is obtained by connecting a lightweight breathing terminal to the oxygen output interface of the oxygen generation unit. The beneficial effects of this solution include: Firstly, it achieves deep integration and intelligent linkage of the three previously isolated safety aspects: environmental monitoring, ventilation and dilution, and personnel oxygen supply, constructing an integrated closed loop of "monitoring-decision-execution-assistance." In the event of a leak, the system not only alarms but also proactively adjusts the environment and provides seamless respiratory protection for workers, achieving a qualitative leap from passive protection to proactive assurance.

[0017] Secondly, this method completely solves the fundamental pain point of mobile oxygen supply equipment: by adopting a fixed pipeline oxygen supply + lightweight breathing terminal mode, maintenance personnel are completely freed from the burden of heavy gas cylinders, allowing for flexible and free movement. Furthermore, the oxygen supply time is only limited by the main unit's oxygen production capacity, theoretically allowing for unlimited extension, eliminating work interruptions caused by gas cylinder replacements, and extending the time for a single continuous emergency repair operation several times over (for example, from less than 3 hours to more than 8 hours), greatly improving repair efficiency and production continuity.

[0018] Thirdly, it embodies intelligent collaborative control, innovatively proposing a dual-parameter threshold linkage control strategy for oxygen and ammonia gas tailored to the characteristics of ammonia production workshops. This strategy is not simply about switching equipment on and off, but rather an intelligent decision-making process that dynamically balances and prioritizes the most critical safety objectives. Especially in emergency mode, the parallel execution of full-load ventilation and full-load oxygen production demonstrates a collaborative control philosophy that places environmental safety and personnel safety on an equal and highest priority—something that cannot be achieved through simple system aggregation.

[0019] Fourthly, this method offers good economic efficiency and reliability. It employs a base load operation strategy, resulting in low power consumption and energy savings; the fixed pipeline system is easier to maintain and manage centrally than a large number of mobile gas cylinders, offering higher reliability; simultaneously, by reducing the concentration of ammonia in the environment, it also helps delay equipment corrosion, generating indirect economic benefits. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating an embodiment of the intelligent air quality management method for an ammonia production workshop according to this application. Figure 2 This is a schematic diagram illustrating the specific process of the intelligent air quality management method for the ammonia production workshop described in this application. Figure 3 This is a schematic diagram of the architecture of an embodiment of the intelligent air quality management system for the ammonia production workshop of this application; Figure 4 This is a schematic diagram of the hardware structure of the control unit involved in the embodiment of this application. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0023] In a first aspect, embodiments of this application provide an intelligent air quality management method for an ammonia production workshop.

[0024] In one embodiment, reference is made to Figure 1 and Figure 2 , Figure 1 This is a flowchart illustrating the first embodiment of the intelligent air quality management method for an ammonia production workshop according to this application. (Combined with...) Figure 1 As shown, the intelligent air quality management method in the ammonia production workshop includes: Step S101: Monitor the oxygen concentration and ammonia concentration in the ammonia production workshop through the gas monitoring unit.

[0025] Step S102: The control unit compares the oxygen concentration and ammonia concentration with the preset safe thresholds for oxygen concentration and ammonia concentration, generates and issues control commands based on the comparison results, and controls the oxygen production unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands.

[0026] Step S103: Obtain oxygen by connecting the lightweight breathing terminal to the oxygen output interface of the oxygen generating unit.

[0027] The intelligent air quality management method for the ammonia production workshop in this embodiment can be implemented as follows: Figure 3 The method for intelligent air quality management of the ammonia production workshop described in this application is implemented in the intelligent air quality management system of the ammonia production workshop shown below.

[0028] Combination Figure 3 As shown, this application provides an intelligent air quality management system for an ammonia production workshop. The system adopts a layered architecture, specifically including a sensing layer, a control layer, an execution layer, and a terminal layer. The sensing layer includes a gas monitoring unit, the control layer includes a control unit, the execution layer includes an oxygen generation unit and a ventilation circulation unit, and the terminal layer includes a lightweight breathing terminal. The gas monitoring unit, oxygen generation unit, and ventilation circulation unit are each electrically connected to the control unit.

[0029] Specifically, the sensing layer includes gas monitoring units, which are distributed throughout the ammonia production workshop in the form of a distributed sensor network. These gas monitoring units include oxygen sensors for monitoring oxygen concentration and ammonia sensors for monitoring ammonia concentration. The number and location of the oxygen and ammonia sensors can be configured according to the workshop equipment layout and monitoring requirements. For example, they can be installed in pipeline areas, pre-marked potential leak points, and / or inspection routes within the ammonia production workshop. Potential leak risk points include valves, flanges, and pump seals.

[0030] Preferably, the oxygen sensor is an electrochemical sensor with a range of 0-25% VOL and an accuracy of ±0.3% VOL; the ammonia sensor is an electrochemical sensor with a range of 0-100 mg / m³ and an accuracy of ±2 mg / m³. The sensor installation height can be set based on the height of the human breathing zone, for example, 1.5-1.8 meters. Both the oxygen and ammonia sensors have corrosion-resistant and explosion-proof characteristics (e.g., IP65 protection rating). All sensors transmit the real-time oxygen concentration data via an industrial bus (e.g., a 4-20mA current loop or Modbus RTU protocol). and ammonia concentration The data is uploaded to the control unit.

[0031] The core of the control unit can be a distributed control system (DCS), with an industrial-grade programmable logic controller (PLC) as the main control unit. The control unit pre-stores the control program and safety thresholds for oxygen and ammonia concentrations. The oxygen concentration safety thresholds include an upper limit for oxygen concentration. and oxygen concentration lower limit threshold The safe threshold for ammonia concentration includes the threshold for routine ammonia inspection. Ammonia daily warning threshold and ammonia leak alarm threshold The daily inspection threshold for ammonia gas The aforementioned daily warning threshold for ammonia The ammonia leak alarm threshold Increase sequentially.

[0032] Preferably, in this embodiment, the lower limit threshold for oxygen concentration is... The value is 19.5% VOL, the upper limit threshold for oxygen concentration. The value is 23.5% VOL, which is the daily inspection threshold for ammonia. The value is 15 mg / m³, which is the daily warning threshold for ammonia. The value is 20 mg / m³, which is the ammonia leak alarm threshold. The value is 30 mg / m³.

[0033] The control unit receives the oxygen concentration data sent by the gas monitoring unit. and ammonia concentration data The system analyzes and filters the data, then executes a control program to send control commands to the oxygen production and ventilation circulation units in the execution layer, thus achieving intelligent air quality management in the ammonia production workshop. A moving average filtering algorithm can be used to suppress transient interference.

[0034] The oxygen generation unit is installed within the ammonia production workshop in the form of a distributed, fixed oxygen supply network. Each oxygen generation unit includes one or more pressure swing adsorption (PSA) oxygen generators, oxygen delivery pipelines connected to the oxygen outlets of the generators, and multiple oxygen output ports distributed along the delivery pipelines. The delivery pipelines can be laid in a distributed manner along the walls or frames of the ammonia production workshop at pre-marked potential leak points and / or inspection routes.

[0035] Optionally, the oxygen concentrator can be selected with an oxygen production capacity ≥1 m³ / h and an oxygen purity ≥93%, meeting safe breathing requirements. The start / stop and load of the oxygen concentrator are controlled by a DCS (Distributed Control System), for example, it can be set to a base load of 0.3-0.5 m³ / h, a regular load of 0.5-0.8 m³ / h, and a maximum load of 1.0 m³ / h. The oxygen delivery pipeline is made of corrosion-resistant stainless steel, with 304 / 316L stainless steel as an option. The oxygen output interface uses quick-connect couplings such as G3 / 8 or G1 / 2, with sealing caps, and can be installed every 5-10 meters along the pipeline or near potential leak points, depending on maintenance needs.

[0036] The ventilation circulation unit consists of several industrial axial flow fans and their matching variable frequency drives (VFDs), installed at workshop ventilation openings or key locations. The fan speed is controlled by the DCS via the VFD, for example, with an adjustment range of 1000-3000 rpm.

[0037] The lightweight breathing apparatus includes a positive-pressure respirator, a breathing valve, and an oxygen delivery line. The positive-pressure respirator does not have a built-in gas cylinder. The oxygen delivery line can be a 3-5 meter flexible hose, with a quick-connect fitting at the end for the oxygen output port. The positive-pressure respirator is configured for a detachable connection between the oxygen delivery line and the oxygen output port. In an emergency, maintenance personnel wearing the positive-pressure respirator can quickly connect the hose fitting to the oxygen output port on a nearby wall and open the valve to obtain a stable pressure (e.g., 0.2-0.3 MPa) of oxygen for breathing.

[0038] In one embodiment, such as Figure 2 As shown, the intelligent air quality management process in the ammonia production workshop includes two modes. The first mode is the routine control mode, in which the system completes sensor calibration and pipeline airtightness checks after power-on. Afterwards, it enters 24 / 7 routine monitoring and control, which includes the following processes: If the ammonia concentration is less than or equal to the daily ammonia inspection threshold during the designated daytime period: During the designated nighttime period, the ammonia concentration is less than or equal to the daily ammonia warning threshold. And the oxygen concentration is between the upper and lower limits of the oxygen concentration threshold: This indicates that the air quality in the ammonia production workshop is currently stable, and the control unit generates and issues the first control command. After receiving the first control command, both the oxygen production unit and the ventilation circulation unit operate at the preset base load. At this time, the oxygen generator is under low load, and the fan is running at normal speed.

[0039] If the oxygen concentration is less than the lower limit threshold for oxygen concentration This indicates that the oxygen concentration in the ammonia production workshop is currently low and needs to be increased. The control unit then generates and issues a second control command to increase the operating load of the oxygen production unit, thereby increasing the oxygen production output until the oxygen concentration is greater than or equal to the first recovery value. The first recovery value is greater than the lower limit threshold for oxygen concentration, and is set to a value that is... VOL, therefore, under this operating condition, the oxygen generating unit is controlled to increase its operating load, thereby increasing the oxygen output of the oxygen generating unit until... VOL; If the ammonia concentration during the daytime period is greater than the daily ammonia inspection threshold but less than or equal to the ammonia leak alarm threshold: During nighttime hours, the ammonia concentration is greater than the daily ammonia warning threshold but less than or equal to the ammonia leak alarm threshold. Or the oxygen concentration is greater than the upper limit threshold for oxygen concentration: The control unit then generates and issues a third control command to increase the operating load of the ventilation circulation unit and enhance its ventilation intensity until the ammonia concentration is less than or equal to the second recovery value and the oxygen concentration is less than or equal to the third recovery value. The second recovery value is equal to the daily ammonia inspection threshold, and the third recovery value is less than the upper limit threshold for oxygen concentration, with a value of [value missing]. VOL, therefore, under this operating condition, the ventilation circulation unit is controlled to increase the operating load and enhance the ventilation intensity of the ventilation circulation unit until... mg / m³ and VOL.

[0040] The specific time intervals for daytime and nighttime periods can be defined according to requirements.

[0041] For clarity, the daily ammonia inspection threshold applies to daytime working hours when staff are present or frequently enter and exit the area, while the daily ammonia warning threshold applies to nighttime hours when staff are sparsely present or unattended. Because ammonia has an irritating odor and poses potential health hazards, even prolonged exposure at low concentrations can cause respiratory discomfort or other health risks. Therefore, during periods of high personnel activity, the system employs a lower daily ammonia inspection threshold to proactively protect the working environment and ensure the health and safety of personnel within the ammonia production workshop.

[0042] Specifically, during the daytime, when staff frequently enter and exit the ammonia production workshop, the system sets a lower daily ammonia inspection threshold. Once the ammonia concentration exceeds this threshold, the system automatically controls the ventilation circulation unit to increase its operating load for ventilation and purification, promptly reducing the ammonia concentration in the environment and ensuring a safe and clean working environment for personnel. At night, since there is minimal personnel activity on-site, the focus is primarily on equipment operational safety and system stability. Therefore, a relatively higher ammonia concentration level is permissible at night. A higher daily ammonia warning threshold is used, and the system only controls the ventilation circulation unit to increase its operating load when the ammonia concentration reaches this threshold.

[0043] Through the aforementioned dual-threshold dynamic adaptation mechanism, this solution can intelligently adjust the ammonia concentration control strategy according to the actual personnel activity situation. While ensuring the health and safety of personnel, it avoids frequent increases in equipment load due to excessively low thresholds during unattended periods, reduces unnecessary energy waste, thereby improving the overall system safety and achieving energy-saving goals.

[0044] It is worth noting that the goal of this conventional control mode is to automatically maintain the overall air quality of the workshop up to standard when no one is performing maintenance, and to provide a safe environment for inspection personnel who may enter, so that they can conduct safe inspections without the need for additional oxygen supply equipment.

[0045] The second mode is the emergency response mode. In this mode, if an ammonia leak occurs at a certain location, the DCS control system will immediately trigger an emergency response. If the ammonia concentration is greater than the ammonia leak alarm threshold: The control unit generates and issues a fourth control command to control the oxygen generation unit and the ventilation circulation unit to operate at maximum load, to make the ventilation circulation unit operate at the highest speed (e.g., 3000 rpm) to fully dilute the leaked ammonia, and to make the oxygen generation unit operate at full load (e.g., 1.0 m³ / h) to ensure sufficient oxygen supply until the ammonia concentration is less than the daily ammonia warning threshold.

[0046] Preferably, when the ammonia concentration exceeds the ammonia leak alarm threshold, the control unit activates the audible and visual alarm (e.g., sound intensity ≥ 85dB, red light flashing) to warn personnel to evacuate or notify maintenance personnel to perform maintenance.

[0047] For example, upon receiving an alarm, maintenance personnel don basic protective gear, such as protective clothing and goggles, and carry a cylinderless respirator to the vicinity of the leak area. They locate the nearest wall-mounted oxygen outlet, open the sealing cap, insert and tighten the quick-connect fitting of the oxygen hose on the respirator, and open the outlet valve. At this point, oxygen generated by the fully operational oxygen generator is directly delivered to the maintenance personnel's respirator through the fixed pipeline network.

[0048] With stable breathing guaranteed, maintenance personnel repaired the leak. During this process, the DCS control system operated the oxygen generation and ventilation circulation units at maximum load, continuously maintaining an emergency control mode of "forced ventilation + forced oxygen" to minimize the ammonia concentration in the leak area. Suppressed at the ammonia leak alarm threshold This ensures a stable oxygen supply pressure. This mode allows maintenance personnel to work continuously for extended periods (e.g., more than 8 hours) without being limited by cylinder capacity.

[0049] After the leak was repaired, maintenance personnel closed the oxygen interface valve, disconnected the hose, and evacuated. The DCS continued monitoring until the ammonia concentration... Gradually decreasing to the daily warning threshold for ammonia. After that, the system will automatically switch back to the normal control mode and resume low-power operation under normal inspection conditions.

[0050] In one specific embodiment, the intelligent air quality management method for an ammonia production workshop includes the following steps: Step S201: Real-time environmental data sensing and transmission. Through a distributed sensor network deployed within the ammonia production workshop, oxygen concentration data from multiple locations within the workshop is collected in real time. and ammonia concentration data The collected data is then transmitted to the control unit DCS.

[0051] Step S202: Intelligent decision-making and coordinated control based on dual thresholds. The DCS receives sensor data and compares it with preset safe thresholds for oxygen and ammonia concentrations. Based on the comparison results, it generates and sends coordinated control commands: Conventional control mode: when When the preset alarm threshold is not exceeded, the DCS will... Based on the comparison results with the preset oxygen concentration threshold range, the oxygen production load of the stationary oxygen generation system and the operating intensity of the ventilation circulation system are adjusted independently or in combination to maintain the oxygen concentration in the workshop within a safe range.

[0052] Leakage emergency control mode: When When the preset alarm threshold is exceeded, the DCS activates the emergency logic: synchronously controls the ventilation circulation system to increase its operating intensity to accelerate the dilution of ammonia, and controls the fixed oxygen production system to increase its operating intensity to ensure the oxygen supply, while triggering audible and visual alarms.

[0053] Specifically, the logic for generating coordinated control instructions includes: when Below the preset lower limit At that time, the oxygen production unit is controlled to increase the oxygen production load until... Recovered to the first recovery value; During the daytime Ammonia levels exceeding the daily inspection threshold However, it did not exceed the alarm threshold. At night Ammonia levels exceeding the daily warning threshold However, it did not exceed the alarm threshold. At that time, control the ventilation circulation system to increase its operating intensity until... Drop to the second recovery value; when Above the upper limit threshold for oxygen concentration At that time, control the ventilation circulation system to increase its operating intensity until... It dropped to the third recovery value; when Exceeding the ammonia leak alarm threshold At that time, the emergency control mode for leakage is activated.

[0054] Step S203: Distributed and convenient oxygen supply execution in emergency response mode. After the leak emergency control mode is activated, maintenance personnel arrive near the leak area and quickly connect the oxygen tubing of their cylinderless positive pressure breathing apparatus to a nearby fixed oxygen output interface supplied by a fixed oxygen generation system. This provides a continuous and stable supply of oxygen for breathing, allowing maintenance work to be carried out under this oxygen supply guarantee. During this period, the DCS continues to execute the leak emergency control logic of step S202.

[0055] Secondly, embodiments of this application also provide an intelligent air quality management system for an ammonia production workshop.

[0056] In one embodiment, reference is made to Figure 3 , Figure 3 This is a functional module diagram of an embodiment of the intelligent air quality management system for an ammonia production workshop according to this application. Figure 3 As shown, the intelligent air quality management system in the ammonia production workshop includes: The control unit, a gas monitoring unit, an oxygen generation unit, and a ventilation and circulation unit electrically connected to the control unit, and a lightweight breathing terminal; The gas monitoring unit is used to collect the oxygen and ammonia concentrations in the ammonia production workshop. The control unit is used to compare the oxygen concentration and ammonia concentration with preset oxygen concentration safety thresholds and ammonia concentration safety thresholds, generate and issue control commands based on the comparison results, so as to control the oxygen production unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands; The oxygen generation unit also includes an oxygen output interface, which is configured to obtain oxygen using the lightweight breathing terminal when connected to it.

[0057] Furthermore, in one embodiment, the gas monitoring unit includes: At least one oxygen sensor for monitoring oxygen concentration and at least one ammonia sensor for monitoring ammonia concentration are provided in the pipeline area, pre-marked potential leak points and / or inspection path areas of the ammonia production workshop.

[0058] Furthermore, in one embodiment, the oxygen generating unit includes: An oxygen generator, an oxygen delivery pipeline connected to the oxygen outlet of the oxygen generator, and multiple oxygen output interfaces distributed on the oxygen delivery pipeline; The oxygen delivery pipelines are distributed along the walls of the ammonia production workshop at pre-marked potential leak points and / or inspection route areas.

[0059] Furthermore, in one embodiment, the lightweight breathing terminal includes: a positive pressure breathing shield, a breathing valve, and an oxygen inhalation tubing; The oxygen inhalation tubing includes a quick connector adapted to the oxygen output interface, and the positive pressure respirator is configured to be detachably connected to the oxygen output interface via the oxygen inhalation tubing.

[0060] Furthermore, in one embodiment, the ventilation circulation unit includes at least one industrial axial flow fan, which is located at the ventilation opening of the ammonia production workshop.

[0061] The functions of each module in the intelligent air quality management system of the ammonia production workshop correspond to the steps in the embodiment of the intelligent air quality management method for the ammonia production workshop. Their functions and implementation processes will not be described in detail here.

[0062] The control unit provided in the embodiments of this application can be a distributed control system (DCS), a server, or other device with data processing capabilities.

[0063] Reference Figure 4 , Figure 4 This is a schematic diagram of the hardware structure of the control unit involved in the embodiments of this application. In the embodiments of this application, the control unit may include a processor, a memory, a communication interface, and a communication bus.

[0064] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0065] Communication interfaces include input / output (I / O) interfaces, physical interfaces, and logical interfaces used to interconnect devices within the control unit, as well as interfaces used to interconnect the control unit with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0066] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0067] The processor can be a general-purpose processor, which can call the intelligent air quality management program for the ammonia production workshop stored in the memory and execute the intelligent air quality management method for the ammonia production workshop provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the intelligent air quality management program for the ammonia production workshop is called can refer to the various embodiments of the intelligent air quality management method for the ammonia production workshop in this application, and will not be repeated here.

[0068] Those skilled in the art will understand that Figure 4 The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0069] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0070] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0071] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0072] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0073] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0074] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0075] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for intelligent air quality management in an ammonia production workshop, characterized in that, The intelligent air quality management method for the ammonia production workshop includes: The oxygen and ammonia concentrations in the ammonia production workshop are monitored using a gas monitoring unit. The control unit compares the oxygen and ammonia concentrations with preset safe thresholds for oxygen and ammonia concentrations, generates and issues control commands based on the comparison results, and controls the oxygen production unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands. Oxygen is obtained by connecting the lightweight breathing terminal to the oxygen output interface of the oxygen generating unit.

2. The intelligent air quality management method for an ammonia production workshop as described in claim 1, characterized in that: The oxygen concentration safety threshold includes an upper limit threshold and a lower limit threshold for oxygen concentration. The ammonia concentration safety threshold includes a daily ammonia inspection threshold, a daily ammonia warning threshold, and an ammonia leak alarm threshold, wherein the daily ammonia inspection threshold, the daily ammonia warning threshold, and the ammonia leak alarm threshold increase sequentially.

3. The intelligent air quality management method for an ammonia production workshop as described in claim 2, characterized in that, The method of comparing the oxygen and ammonia concentrations with preset safe thresholds for oxygen and ammonia concentrations via a control unit, generating and issuing control commands based on the comparison results, to control the oxygen generation unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands, further includes: If the ammonia concentration is less than or equal to the ammonia daily inspection threshold during the calibrated daytime period, and less than or equal to the ammonia daily warning threshold during the calibrated nighttime period, and the oxygen concentration is between the upper limit threshold and the lower limit threshold of oxygen concentration, then a first control command is generated and issued to control the oxygen generation unit and the ventilation circulation unit to operate at a preset base load. If the oxygen concentration is less than the lower limit threshold of oxygen concentration, a second control command is generated and issued to control the oxygen generating unit to increase its operating load until the oxygen concentration is greater than or equal to the first recovery value. If the ammonia concentration is greater than the daily ammonia inspection threshold and less than or equal to the ammonia leak alarm threshold during the daytime period, greater than the daily ammonia warning threshold and less than or equal to the ammonia leak alarm threshold during the nighttime period, and / or the oxygen concentration is greater than the upper limit threshold of oxygen concentration, then a third control command is generated and issued to control the ventilation circulation unit to increase its operating load until the ammonia concentration is less than or equal to a preset second recovery value and the oxygen concentration is less than or equal to a preset third recovery value. Wherein, the first recovery value is greater than the lower limit threshold of oxygen concentration, the second recovery value is equal to the daily inspection threshold of ammonia, and the third recovery value is less than the upper limit threshold of oxygen concentration.

4. The intelligent air quality management method for an ammonia production workshop as described in any one of claims 2 or 3, characterized in that, The process involves comparing the oxygen and ammonia concentrations with preset safe thresholds for oxygen and ammonia concentrations via a control unit, generating and issuing control commands based on the comparison results, and controlling the oxygen generation unit and ventilation circulation unit within the ammonia production workshop to operate according to the load corresponding to the control commands. This includes: If the ammonia concentration is greater than the ammonia leak alarm threshold, a fourth control command is generated and issued to control the oxygen generation unit and the ventilation circulation unit to operate at maximum load until the ammonia concentration is less than the ammonia daily warning threshold.

5. The intelligent air quality management method for an ammonia production workshop as described in claim 4, characterized in that, The method also includes: When the ammonia concentration exceeds the ammonia leak alarm threshold, the control unit activates the audible and visual alarm.

6. An intelligent air quality management system for an ammonia production workshop, characterized in that, For performing the method as described in any one of claims 1 to 5, the system comprises: a control unit, a gas monitoring unit electrically connected to the control unit, an oxygen generation unit and a ventilation and circulation unit, and a lightweight breathing terminal; The gas monitoring unit is used to collect the oxygen and ammonia concentrations in the ammonia production workshop. The control unit is used to compare the oxygen concentration and ammonia concentration with preset oxygen concentration safety thresholds and ammonia concentration safety thresholds, generate and issue control commands based on the comparison results, so as to control the oxygen production unit and ventilation circulation unit in the ammonia production workshop to operate according to the load corresponding to the control commands; The oxygen generation unit also includes an oxygen output interface, which is configured to obtain oxygen using the lightweight breathing terminal when connected to it.

7. The intelligent air quality management system for an ammonia production workshop as described in claim 6, characterized in that, The gas monitoring unit includes: At least one oxygen sensor for monitoring oxygen concentration and at least one ammonia sensor for monitoring ammonia concentration are provided in the pipeline area, pre-marked potential leak points and / or inspection path areas of the ammonia production workshop.

8. The intelligent air quality management system for an ammonia production workshop as described in claim 6, characterized in that, The oxygen generation unit includes: An oxygen generator, an oxygen delivery pipeline connected to the oxygen outlet of the oxygen generator, and multiple oxygen output interfaces distributed on the oxygen delivery pipeline; The oxygen delivery pipelines are distributed along the walls of the ammonia production workshop at pre-marked potential leak points and / or inspection route areas.

9. The intelligent air quality management system for an ammonia production workshop as described in claim 6, characterized in that, The lightweight breathing terminal includes: a positive pressure breathing shield, a breathing valve, and an oxygen inhalation tubing; The oxygen inhalation tubing includes a quick connector adapted to the oxygen output interface, and the positive pressure respirator is configured to be detachably connected to the oxygen output interface via the oxygen inhalation tubing.

10. The intelligent air quality management system for an ammonia production workshop as described in claim 6, characterized in that, The ventilation circulation unit includes at least one industrial axial flow fan, which is installed at the ventilation opening of the ammonia production workshop.

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