Ammonia gas leakage self-protection device, self-protection control method and system

Abstract

The invention belongs to the technical field of ammonia gas leakage prevention, and particularly relates to an ammonia gas leakage self-protection device and a self-protection control method and system. Comprising an ammonia water blending unit, an ammonification room and a controller, wherein the ammonia water blending unit is arranged in the ammonification room; the ammonia water blending unit comprises a liquid ammonia storage tank, a demineralized water supply pipeline and an ammonia solution tank, the liquid ammonia storage tank is connected with the ammonia solution tank through an ammonia supply pipeline, the demineralized water supply pipeline is connected with the ammonia solution tank through a first quick-closing valve, and a second quick-closing valve is arranged between the liquid ammonia storage tank and the ammonia supply pipeline; a spraying device, an air interchanger and an ammonia concentration detector are arranged in the ammonia adding room, and the controller is configured to control opening and closing of the second quick-closing valve, the air interchanger and the spraying device according to the ammonia concentration detected by the ammonia concentration detector. According to the invention, automatic monitoring and self-starting of emergency measures during ammonia leakage can be realized, the monitoring and response speed of the emergency measures is improved, and the personal and equipment safety can be effectively ensured.

Description

Technical Field

[0001] This invention belongs to the field of ammonia leakage prevention technology, and particularly relates to an ammonia leakage self-protection device, self-protection control method, and system. Background Art

[0002] Boiler steam-water systems require increasing the pH value of feedwater to slow down metal corrosion. Currently, the industry uses ammonia as an alkalizing agent, which is added to the feedwater quantitatively via a metering pump. Considering economic costs, power plants use 100% pure liquid anhydrous ammonia as the ammonia source, which is a flammable and explosive hazardous chemical. The process system's ammonia source is introduced into a solution tank by connecting liquid ammonia cylinders through metal pipelines. The ammonia is then diluted and dissolved with demineralized water to prepare the required concentration of ammonia solution. Liquid ammonia cylinders are typically placed indoors for operation. Because ammonia gas is flammable and explosive, a nitrogen leak could lead to a very serious accident. Summary of the Invention

[0003] To address the aforementioned problems in the existing technology, this invention provides an ammonia leakage self-protection device, self-protection control method, and system, which can realize the monitoring of environmental ammonia concentration and the automatic activation of protective measures after an ammonia leak, ensuring personal safety during installation.

[0004] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0005] In a first aspect, this application provides an ammonia leakage self-protection device, including an ammonia water preparation unit, an ammonia addition room, and a controller, wherein the ammonia water preparation unit is arranged in the ammonia addition room;

[0006] The ammonia preparation unit includes a liquid ammonia storage tank, a demineralized water supply pipeline, and an ammonia solution tank. The liquid ammonia storage tank is connected to the ammonia solution tank through the ammonia supply pipeline. The demineralized water supply pipeline is connected to the ammonia solution tank through a first quick-closing valve. A second quick-closing valve is provided between the liquid ammonia storage tank and the ammonia supply pipeline.

[0007] The ammonia addition room is equipped with a spray device, a ventilation device, and an ammonia concentration detector. The ammonia concentration detector is used to detect the ammonia concentration in the ammonia addition room.

[0008] The controller is configured to control the opening and closing of the second fast-closing valve, the ventilation device, and the spray device based on the ammonia concentration detected by the ammonia concentration detector.

[0009] Optionally, the system also includes a display connected to the signal output of the controller, which is used to display ammonia concentration information.

[0010] Optionally, the water supply end of the spray device is equipped with a water pressure detector, which is used to detect whether the water supply end of the spray device can supply water normally. The water pressure detector is connected to the signal input end of the controller, and the display can display the water supply status of the water supply end of the spray device detected by the water pressure detector.

[0011] Optionally, a pressure sensor is installed on the liquid ammonia storage tank. The pressure sensor is used to detect the remaining ammonia in the liquid ammonia storage tank. The pressure sensor is connected to the signal input terminal of the controller, and the display can display the information on the remaining ammonia in the liquid ammonia storage tank detected by the pressure sensor.

[0012] Optionally, the spray device is equipped with a spray atomizer, and the water supply end of the spray device is equipped with a Y-type filter.

[0013] Optionally, both the first and second quick-closing valves are electric ball valves.

[0014] Secondly, this application also provides a self-protection control method for the ammonia leakage self-protection device described in the first aspect, comprising:

[0015] The ammonia concentration in the ammonia addition room is collected in real time using an ammonia concentration detector;

[0016] In response to the first concentration setpoint being less than the second concentration setpoint, the ventilation device is turned on.

[0017] In response to the ammonia concentration in the ammonia addition room being ≥ the second concentration set value and lasting for ≥ the first set duration, the second quick-closing valve is closed, the spray device is turned on, and the ventilation device is turned on.

[0018] In response to the ammonia concentration in the ammonia addition room being less than the first concentration set value, the second quick-closing valve is opened, the spray device is closed, and the ventilation device is shut off.

[0019] Optionally, in response to the ammonia concentration in the ammonia addition room being ≥ a first concentration set value and remaining ≥ a second set value for an extended period without decreasing, the alarm will issue an alarm signal.

[0020] Thirdly, this application also provides a self-protection control system for an ammonia leakage self-protection device, comprising:

[0021] The information acquisition module is configured to: collect the ammonia concentration in the ammonia addition room in real time through an ammonia concentration detector;

[0022] The control module is configured as follows:

[0023] In response to the first concentration setpoint being less than the second concentration setpoint, the ventilation device is turned on.

[0024] In response to the ammonia concentration in the ammonia addition room being ≥ the second concentration set value and lasting for ≥ the first set duration, the second quick-closing valve is closed, the spray device is turned on, and the ventilation device is turned on.

[0025] In response to the ammonia concentration in the ammonia addition room being less than the first concentration set value, the second quick-closing valve is opened, the spray device is closed, and the ventilation device is shut off.

[0026] Fourthly, this application also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the self-protection control method for the ammonia leakage self-protection device described in the second aspect.

[0027] Compared with the prior art, this application has at least the following beneficial effects:

[0028] This invention automatically monitors ammonia concentration and automatically controls the liquid ammonia supply, ventilation device, and spray device of the liquid ammonia storage tank according to the concentration. It can realize automatic monitoring and automatic activation of emergency measures in the event of ammonia leakage, improve the monitoring and response speed of emergency measures, and effectively ensure the safety of personnel and equipment.

[0029] This invention allows for real-time monitoring of the water supply by installing a water pressure detector at the water supply end of the spray device, thus preventing the spray device from becoming unusable in the event of an ammonia leak and improving safety. Attached Figure Description

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 This is a schematic diagram of the ammonia preparation unit in the embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the self-protection control method of the ammonia leakage self-protection device in the embodiments of this application;

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Liquid ammonia storage tank; 11. Second quick-closing valve; 2. Demineralized water supply pipeline; 21. First quick-closing valve; 3. Ammonia solution tank; 4. Thermal system. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0036] Example 1

[0037] An ammonia leakage self-protection device includes an ammonia water preparation unit, an ammonia addition room, and a controller, wherein the ammonia water preparation unit is arranged in the ammonia addition room;

[0038] like Figure 1 As shown, the ammonia water preparation unit includes a liquid ammonia storage tank 1, a demineralized water supply pipeline 2, and an ammonia solution tank 3. The liquid ammonia storage tank 1 is connected to the ammonia solution tank 3 through the ammonia supply pipeline, and the demineralized water supply pipeline 2 is connected to the ammonia solution tank 3 through a first quick-closing valve 21. A second quick-closing valve 11 is installed between the liquid ammonia storage tank 1 and the ammonia supply pipeline. Liquid ammonia is supplied through the liquid ammonia storage tank 1, and demineralized water is supplied through the demineralized water supply pipeline 2. Then, the liquid ammonia and demineralized water are mixed in the ammonia solution tank 3 to prepare ammonia water, and then the ammonia water is supplied to the subsequent thermal system 4.

[0039] The ammonia addition room is equipped with a spray system, a ventilation system, and an ammonia concentration detector. The ammonia concentration detector is used to detect the ammonia concentration in the ammonia addition room.

[0040] The controller is configured to control the opening and closing of the second fast-closing valve 11, the ventilation device and the spray device based on the ammonia concentration detected by the ammonia concentration detector.

[0041] This invention automatically monitors the ammonia concentration and automatically controls the liquid ammonia supply and the opening and closing of the ventilation and spray devices in the liquid ammonia storage tank 1 according to the concentration. It can realize automatic monitoring and automatic activation of emergency measures in the event of ammonia leakage, improve the monitoring and response speed of emergency measures, and effectively ensure the safety of personnel and equipment.

[0042] In this embodiment, a water pressure detector is installed at the water supply end of the spray device. The water pressure detector is used to detect whether the water supply end of the spray device can supply water normally. The water pressure detector is connected to the signal input end of the controller.

[0043] A pressure sensor is installed on the liquid ammonia storage tank 1. The pressure sensor is used to detect the remaining ammonia in the liquid ammonia storage tank 1. The pressure sensor is connected to the signal input terminal of the controller.

[0044] It also includes a display, which is connected to the signal output terminal of the controller. The display is used to show the ammonia concentration, the water supply status of the spray device detected by the water pressure detector, and the ammonia balance information in liquid ammonia storage tank 1 detected by the pressure sensor. The ammonia concentration allows for real-time monitoring of ammonia leakage in the ammonia addition room; the pressure sensor allows for real-time acquisition of the ammonia balance information in liquid ammonia storage tank 1, facilitating ammonia addition; and the monitoring of the water supply status of the spray device prevents the spray device from failing to provide water in case of emergency, thus improving safety.

[0045] In this embodiment, the spray device is equipped with a spray atomizer, and the water supply end of the spray device is equipped with a Y-type filter. The spray atomizer increases the contact area between the spray water and the leaked ammonia gas, thereby quickly absorbing the leaked ammonia gas. By setting up the Y-type filter to filter the incoming water, the spray atomizer is prevented from being clogged, thus improving the durability of the equipment.

[0046] In this embodiment, both the first quick-closing valve 21 and the second quick-closing valve 11 are electric ball valves. The flow of liquid ammonia and water can be quickly controlled by opening and closing the electric ball valves.

[0047] Example 2

[0048] This embodiment provides a self-protection control method for the ammonia leakage self-protection device described in Embodiment 1, such as... Figure 2 As shown, it includes:

[0049] The ammonia concentration in the ammonia addition room is collected in real time using an ammonia concentration detector;

[0050] In response to the first concentration setpoint being less than or equal to the ammonia concentration in the ammonia addition room and less than the second concentration setpoint, the ventilation device is activated; in this embodiment, the first concentration setpoint is 3 ppm and the second concentration setpoint is 20 ppm.

[0051] In response to the ammonia concentration in the ammonia addition room being ≥ the second concentration setting value and lasting for ≥ the first setting time (10s), the second quick-closing valve 11 is closed, the spray device is turned on, and the ventilation device is turned on.

[0052] In response to the ammonia concentration in the ammonia addition room being less than the first concentration set value, the second quick-closing valve 11 is opened, the spray device is closed, and the ventilation device is closed.

[0053] If the ammonia concentration in the ammonia addition room is greater than or equal to the first concentration set value, and the ammonia concentration in the ammonia addition room remains greater than or equal to the second set value for a duration of 10 seconds without decreasing, the alarm will issue an alarm signal.

[0054] Example 3

[0055] Based on the self-protection control method of the ammonia leakage self-protection device described in Example 2, this example provides a self-protection control system for the ammonia leakage self-protection device, including:

[0056] The information acquisition module is configured to: collect the ammonia concentration in the ammonia addition room in real time through an ammonia concentration detector;

[0057] The control module is configured as follows:

[0058] In response to the first concentration setpoint being less than the second concentration setpoint, the ventilation device is turned on.

[0059] In response to the ammonia concentration in the ammonia addition room being ≥ the second concentration set value and lasting for ≥ the first set duration, the second quick-closing valve 11 is closed, the spray device is turned on, and the ventilation device is turned on.

[0060] In response to the ammonia concentration in the ammonia addition room being less than the first concentration set value, the second quick-closing valve 11 is opened, the spray device is closed, and the ventilation device is shut off.

[0061] Example 4

[0062] This embodiment provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the self-protection control method for the ammonia leakage self-protection device described in Embodiment 2.

[0063] 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 will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A self-protection device for ammonia leakage, characterized in that, It includes an ammonia water preparation unit, an ammonia addition room, and a controller, wherein the ammonia water preparation unit is arranged in the ammonia addition room; The ammonia preparation unit includes a liquid ammonia storage tank, a demineralized water supply pipeline, and an ammonia solution tank. The liquid ammonia storage tank is connected to the ammonia solution tank through the ammonia supply pipeline. The demineralized water supply pipeline is connected to the ammonia solution tank through a first quick-closing valve. A second quick-closing valve is provided between the liquid ammonia storage tank and the ammonia supply pipeline. The ammonia addition room is equipped with a spray device, a ventilation device, and an ammonia concentration detector. The ammonia concentration detector is used to detect the ammonia concentration in the ammonia addition room. The controller is configured to control the opening and closing of the second fast-closing valve, the ventilation device, and the spray device based on the ammonia concentration detected by the ammonia concentration detector.

2. The ammonia leakage self-protection device according to claim 1, characterized in that, It also includes a display, which is connected to the signal output terminal of the controller and is used to display ammonia concentration information.

3. The ammonia leakage self-protection device according to claim 2, characterized in that, The water supply end of the spray device is equipped with a water pressure detector, which is used to detect whether the water supply end of the spray device can supply water normally. The water pressure detector is connected to the signal input end of the controller, and the display can display the water supply status of the water supply end of the spray device detected by the water pressure detector.

4. The ammonia leakage self-protection device according to claim 1, characterized in that, The liquid ammonia storage tank is equipped with a pressure sensor, which is used to detect the remaining ammonia in the liquid ammonia storage tank. The pressure sensor is connected to the signal input terminal of the controller, and the display can display the information on the remaining ammonia in the liquid ammonia storage tank detected by the pressure sensor.

5. The ammonia leakage self-protection device according to claim 1, characterized in that, The spraying device is equipped with a spray atomizer, and the water supply end of the spraying device is equipped with a Y-type filter.

6. The ammonia leakage self-protection device according to claim 1, characterized in that, Both the first and second quick-closing valves are electric ball valves.

7. A self-protection control method for an ammonia leakage self-protection device according to any one of claims 1-6, characterized in that, include: The ammonia concentration in the ammonia addition room is collected in real time using an ammonia concentration detector; In response to the first concentration setpoint being less than the second concentration setpoint, the ventilation device is turned on. In response to the ammonia concentration in the ammonia addition room being ≥ the second concentration set value and lasting for ≥ the first set duration, the second quick-closing valve is closed, the spray device is turned on, and the ventilation device is turned on. In response to the ammonia concentration in the ammonia addition room being less than the first concentration set value, the second quick-closing valve is opened, the spray device is closed, and the ventilation device is shut off.

8. The self-protection control method for the ammonia leakage self-protection device according to claim 7, characterized in that, When the ammonia concentration in the ammonia addition room is greater than or equal to the first concentration set value and remains greater than or equal to the second set value for an extended period without decreasing, the alarm will sound.

9. A self-protection control system for an ammonia leakage self-protection device, characterized in that, include: The information acquisition module is configured to: collect the ammonia concentration in the ammonia addition room in real time through an ammonia concentration detector; The control module is configured as follows: In response to the first concentration setpoint being less than the second concentration setpoint, the ventilation device is turned on. In response to the ammonia concentration in the ammonia addition room being ≥ the second concentration set value and lasting for ≥ the first set duration, the second quick-closing valve is closed, the spray device is turned on, and the ventilation device is turned on. In response to the ammonia concentration in the ammonia addition room being less than the first concentration set value, the second quick-closing valve is opened, the spray device is closed, and the ventilation device is shut off.

10. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instruction is executed by the processor, it implements the steps of the self-protection control method of the ammonia leakage self-protection device as described in any one of claims 7 to 8.

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