Nitric acid production device capable of reducing boiler water

Abstract

The utility model relates to the technical field of chemical production, in particular to a nitric acid production device capable of reducing boiler water. The utility model discloses a nitric acid production device capable of reducing boiler water, which comprises a deaerator and further comprises a water seal pipe arranged on the deaerator and used for maintaining micro-positive pressure in the deaerator; the recovery mechanism is connected with the overflow port of the water sealing pipe and the desalted water tank and is used for recovering the overflowed desalted water; and the control mechanism is arranged on the recovery pipe and is used for controlling the flow direction of the desalted water. According to the nitric acid production device capable of reducing boiler water, the recycling mechanism is arranged at the overflow port of the water sealing pipe, overflowing desalted water is recycled into the desalting water tank, the overflowing desalted water is recycled into the desalting water tank, effective recycling of water resources is achieved, wastewater discharge is reduced, the influence on the external environment is relieved, and the production efficiency is improved. The requirements of environmental protection policies are met.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical production, in particular to a nitric acid production device capable of reducing boiler water. BACKGROUND

[0002] With the continuous development of industrial technology, the production efficiency and environmental protection requirements of nitric acid production, as an important part of the chemical industry, are increasingly improved. In the production process of nitric acid, the deaerator is one of the key devices for ensuring the purity of water in the system and preventing oxygen from corroding the boiler pipeline.

[0003] The traditional deaerator usually adopts the method of low-pressure steam heat deaeration to remove the dissolved oxygen in the desalinated water, so as to maintain the stable operation of the boiler water supply system. However, in actual operation, the design and operation of the traditional deaerator face a series of challenges.

[0004] At present, in the design of the deaerator adopted by most nitric acid production enterprises, the water seal is used as a key component to maintain the micro-positive pressure state (0.02 MPa-0.05 MPa) in the deaerator, so as to ensure the deaeration effect and also play a safe pressure relief role when the pressure is too high or the water is full. However, due to the fact that the water supplement of the deaerator is added from the top, and the condensate water generated by the low-pressure steam condensation, the water seal pipeline is often in a high water level state, resulting in continuous water overflow from the overflow port.

[0005] Therefore, the continuous water overflow not only causes the waste of valuable desalinated water resources, but also increases the production cost of the enterprise; the overflow water is directly discharged into the environment, increasing the burden of sewage treatment and not meeting the requirements of the current environmental protection policy; and the too high water level may cause unstable pressure of the deaerator, affecting the safe operation of the equipment.

[0006] Therefore, the application provides a nitric acid production device capable of reducing boiler water. Practical new type content

[0007] In order to overcome the shortcomings of the prior art, the application provides a nitric acid production device capable of reducing boiler water, which recovers the overflow desalinated water into the desalinated water tank by arranging a recovery mechanism at the overflow port of the water seal pipe, realizes the effective recycling of water resources, reduces wastewater discharge, reduces the influence on the external environment, and meets the requirements of the environmental protection policy.

[0008] The technical scheme adopted by the application to solve the technical problems is:

[0009] The nitric acid production device capable of reducing boiler water comprises a deaerator and further comprises:

[0010] A water seal pipe is arranged on the deaerator and is used for maintaining the micro-positive pressure in the deaerator.

[0011] a recovery mechanism connected to the overflow port of the water seal pipe and the desalinated water tank for recovering the overflowed desalinated water;

[0012] a control mechanism arranged on the recovery mechanism for controlling the flow direction of the desalinated water.

[0013] In one or more of the technical solutions, the recovery mechanism comprises pipes with different diameters.

[0014] In one or more of the technical solutions, the recovery mechanism comprises a first recovery pipe and a second recovery pipe, wherein the diameter of the first recovery pipe is larger than that of the second recovery pipe; the first recovery pipe is connected to the overflow port of the water seal pipe, and the second recovery pipe is connected to the first recovery pipe and extends to the desalinated water tank.

[0015] In one or more of the technical solutions, the control mechanism comprises first and second control valves arranged at different positions of the first recovery pipe, respectively.

[0016] In one or more of the technical solutions, a sealing element is arranged between the water seal pipe and the deaerator for preventing gas leakage.

[0017] In one or more of the technical solutions, a filter element is arranged at the end of the recovery mechanism for filtering the recovered desalinated water.

[0018] In one or more of the technical solutions, the overflow port of the water seal pipe is provided with a flow guide plate for guiding the overflowed water to flow into the recovery mechanism.

[0019] In one or more of the technical solutions, the desalinated water tank is provided with a liquid level sensor for monitoring the liquid level of the desalinated water.

[0020] In one or more of the technical solutions, the top of the deaerator is provided with a feed inlet for adding desalinated water into the deaerator body.

[0021] In one or more of the technical solutions, the discharge outlet of the desalinated water tank is connected to the feed inlet of the deaerator.

[0022] The beneficial effects of the present application are as follows:

[0023] The nitric acid production device disclosed in the present application, by arranging a recovery mechanism at the overflow port of the water seal pipe and connecting the recovery mechanism to the desalinated water tank, realizes effective recovery and utilization of water resources, reduces production cost, at the same time reduces the influence on the external environment, improves the overall safety and stability of the nitric acid production device, and has important significance for promoting the sustainable development of the nitric acid production industry. BRIEF DESCRIPTION OF DRAWINGS

[0024] The application will be further described below in conjunction with the drawings and embodiments.

[0025] Figure 1 is a structural schematic diagram of a nitric acid production device for reducing boiler water according to the application;

[0026] Figure 2 is an enlarged view of A in Figure 1 is an enlarged view of A in

[0027] Figure 3 is a schematic diagram of the material flow of a nitric acid production device for reducing boiler water according to the application in operation;

[0028] Wherein: 1, water seal pipe; 11, overflow port; 2, deaerator; 3, desalted water tank; 4, control mechanism; 41, first control valve; 42, second control valve; 5, recovery mechanism; 51, first recovery pipeline; 52, second recovery pipeline; 6, sealing element; 7, filtering element; 8, flow guide plate; 9, liquid level sensor. DETAILED DESCRIPTION

[0029] The concept, specific structure and technical effects of the application will be described below in conjunction with the embodiments and drawings to fully understand the purpose, features and effects of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all embodiments. Based on the embodiments of the application, other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application. In addition, all the coupling / connections involved in the patent do not mean that the components are directly connected, but that a better coupling structure can be formed by adding or reducing coupling accessories according to the specific implementation. The technical features in the creation of the application can be combined interactively without conflict.

[0030] As shown in Figures 1-2 A nitric acid production device for reducing boiler water, comprising a deaerator 2, further comprising:

[0031] A water seal pipe 1 is arranged on the deaerator 2 for maintaining a slight positive pressure in the deaerator 2.

[0032] A recovery mechanism 5 is connected to the overflow port 11 of the water seal pipe 1 and the desalted water tank 3 for recovering the overflowed desalted water.

[0033] A control mechanism 4 is arranged on the recovery mechanism 5 for controlling the flow direction of the desalted water.

[0034] Specifically, the deaerator is used to remove dissolved oxygen in the desalted water to prevent corrosion of oxygen on the boiler pipeline.

[0035] The water seal pipe is arranged on the deaerator and is used for maintaining micro-positive pressure (0.02 MPa-0.05 MPa) in the deaerator, ensuring the deaeration effect, and playing a role of safe pressure relief when overpressure or full water, and ensuring the safety of the equipment.

[0036] One end of the recovery mechanism is connected to the overflow port of the water seal pipe, and the other end of the recovery mechanism is connected to the desalted water tank, which is used for recovering the overflow desalted water, reducing the waste of water resources, reducing the production cost and reducing the influence on the external environment.

[0037] The control mechanism is arranged on the recovery mechanism and is used for controlling the flow direction of the desalted water, realizing accurate control of the recovery process and avoiding unnecessary waste of resources.

[0038] In one or more embodiments, the recovery mechanism includes pipes with different diameters.

[0039] Specifically, the recovery mechanism includes a first recovery pipe 51 and a second recovery pipe 52, wherein the diameter of the first recovery pipe 51 is greater than the diameter of the second recovery pipe 52; the first recovery pipe 51 is connected to the overflow port 11 of the water seal pipe 1, and the second recovery pipe 52 is connected to the first recovery pipe 51 and extends to the desalted water tank 3.

[0040] More specifically, the first recovery pipe has a large diameter and is mainly used for processing large flow. When the water level in the deaerator is high, the overflow flow is large, and the large-diameter pipe can ensure smooth water flow, reduce water pressure loss, and avoid pipe blockage.

[0041] The second recovery pipe has a small diameter and is mainly used for processing small flow. When the water level in the deaerator is low, the overflow flow is small, and the small-diameter pipe can more accurately control the water flow and reduce unnecessary hydraulic loss.

[0042] In one or more embodiments, the control mechanism 4 includes a first control valve 41 and a second control valve 42, which are arranged at different positions of the first recovery pipe 51.

[0043] Specifically, by arranging the first control valve and the second control valve on the first recovery pipe, the opening and closing degree of the valve can be adjusted according to actual needs, and the direction and flow of the water flow can be flexibly controlled. For example, when a large amount of overflow water needs to be quickly recovered, the valve of the large-diameter pipe can be opened; when small flow needs to be finely controlled, the valve of the large-diameter pipe can be closed and only the small-diameter pipe is used. For example, the diameter of the first recovery pipe is DN100, and the diameter of the second recovery pipe is DN50. The first control valve and the second control valve are both PN16 stainless steel valves, the first control valve is installed at the inlet of the first recovery pipe, and the second control valve is installed at the connection between the first recovery pipe and the second recovery pipe.

[0044] Moreover, the control mechanism can adapt to different working conditions by matching pipes of different diameters. During production, the water level and overflow of the deaerator may change, and by matching pipes of different diameters and valves, these changes can be better handled to ensure stable operation of the system.

[0045] In one or more embodiments, a sealing member 6 is provided between the water seal pipe 1 and the deaerator 2 to prevent gas leakage. The sealing member can be a rubber sealing ring.

[0046] In one or more embodiments, the end of the recovery mechanism is provided with a filter 7 for filtering the recovered desalinated water.

[0047] Specifically, the filter is provided at the end of the recovery pipe to filter the recovered desalinated water, preventing impurities from entering the desalinated water tank and maintaining the purity of the water.

[0048] More specifically, a stainless steel filter screen is provided at the end of the second recovery pipe to filter the recovered desalinated water. Pipes of different diameters can better distribute water flow to ensure the filtering effect of the filter. Large-diameter pipes can handle larger flow rates, while small-diameter pipes can more finely control the filtering process to ensure filtering effectiveness.

[0049] In one or more embodiments, the overflow port 11 of the water seal pipe 1 is provided with a flow guide plate 8 for guiding the overflow water into the recovery mechanism.

[0050] Specifically, the flow guide plate is inclined at an angle of 30°-45° and is provided at the overflow port of the water seal pipe to guide the overflow water into the recovery mechanism, improving recovery efficiency.

[0051] In one or more embodiments, the desalinated water tank 3 is provided with a liquid level sensor 9 for monitoring the liquid level of the desalinated water. Specifically, the liquid level sensor is used to monitor the liquid level of the desalinated water to ensure that the amount of water in the desalinated water tank is within a safe range, preventing excess or deficiency.

[0052] In one or more embodiments, the top of the deaerator 2 is provided with a feed inlet for adding desalinated water to the main body of the deaerator 2. The discharge outlet of the desalinated water tank 3 is connected to the feed inlet of the deaerator 2.

[0053] It can be understood that the deaerator is a common chemical equipment, and its structure is as follows: the deaerator is provided with a feed inlet, a discharge outlet, a heating coil, and a spraying device.

[0054] Feed inlet: located at the top of the shell, used for adding desalinated water.

[0055] Discharge outlet: located at the bottom of the shell, used for discharging treated desalinated water.

[0056] Heating coil: Located inside the shell, used to heat the desalted water to remove dissolved oxygen.

[0057] Spray device: Located at the top of the shell, used to evenly distribute the incoming desalted water.

[0058] Deaeration tower plate: Multi-layer, used to increase the gas-liquid contact area and improve the deoxygenation effect.

[0059] Material: The shell and internal components are usually made of stainless steel (such as 304 or 316L) to prevent corrosion.

[0060] As shown in Figure 3 , the working process of the nitric acid production device is as follows:

[0061] Start-up phase: The deaerator starts working, and desalted water is added to the deaerator through the top inlet. Low-pressure steam enters the deaerator to remove dissolved oxygen in the desalted water through heating, ensuring the purity of the water.

[0062] Deoxygenation process: The desalted water in the deaerator is heated by the low-pressure steam, and the dissolved oxygen escapes. The water seal pipe maintains a slight positive pressure (0.02-0.05 MPa) in the deaerator, ensuring the deoxygenation effect and preventing external air from entering.

[0063] Overflow recovery: Excess water in the deaerator is discharged through the overflow port of the water seal pipe, and the deflector guides the overflow water into the first recovery pipeline. The valve on the first recovery pipeline adjusts the opening and closing according to the needs, controlling the flow direction of the desalted water. After filtering through the filter on the second recovery pipeline, the overflow water returns to the desalted water tank.

[0064] Liquid level monitoring: The liquid level sensor in the desalted water tank monitors the liquid level of the desalted water in real time, ensuring that the liquid level is within a safe range. If the liquid level is too high or too low, adjust the water inflow of the inlet to maintain the normal working state of the desalted water tank.

[0065] Recycling: The recovered desalted water enters the deaerator again through the inlet, realizing the recycling of water resources, reducing production costs, and reducing the impact on the external environment.

[0066] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without deviating from the spirit of the present application, and these equivalent modifications or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A device for reducing the production of nitric acid in boiler water, comprising a deaerator (2), characterised in that, Also included are: a water seal pipe (1) arranged on the deaerator (2) for maintaining a slight positive pressure in the deaerator (2); a recovery mechanism (5) connecting the overflow port (11) of the water seal pipe (1) and the desalted water tank (3) for recovering the overflowed desalted water; a control mechanism (4) arranged on the recovery mechanism (5) for controlling the flow direction of the desalted water.

2. The nitric acid production apparatus according to claim 1, characterized by The recovery mechanism (5) includes pipes with different diameters.

3. The nitric acid production apparatus according to claim 2, characterized in that, The recovery mechanism (5) includes a first recovery pipe (51) and a second recovery pipe (52), wherein the diameter of the first recovery pipe (51) is larger than that of the second recovery pipe (52); the first recovery pipe (51) is connected to the overflow port (11) of the water seal pipe (1), and the second recovery pipe (52) is connected to the first recovery pipe (51) and extends to the desalted water tank (3).

4. The nitric acid production apparatus according to claim 3, characterized in that, The control mechanism (4) includes first and second control valves (41 and 42) arranged at different positions of the first recovery pipe (51), respectively.

5. The nitric acid production apparatus according to claim 1, characterized by A sealing element (6) is arranged between the water seal pipe (1) and the deaerator (2) to prevent gas leakage.

6. The nitric acid production apparatus according to claim 1, wherein The end of the recovery mechanism (5) is provided with a filter element (7) for filtering the recovered desalted water.

7. The nitric acid production apparatus according to claim 1, wherein The overflow port (11) of the water seal pipe (1) is provided with a flow guide plate (8) for guiding the overflowed water to flow into the recovery mechanism (5).

8. The nitric acid production apparatus according to claim 1, characterized by The desalted water tank (3) is provided with a liquid level sensor (9) for monitoring the liquid level of the desalted water.

9. The nitric acid production apparatus according to claim 1, characterized by The top of the deaerator (2) is provided with a feed inlet for adding desalted water into the main body of the deaerator (2).

10. The nitric acid production apparatus according to claim 9, characterized in that, The discharge port of the desalted water tank (3) is connected to the feed inlet of the deaerator (2).

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