A desulfurization wastewater evaporation tank liquid level device

Abstract

The utility model discloses a kind of desulfurization wastewater evaporation tank liquid level devices, combination type liquid level meter is arranged on evaporation tank body, combination type liquid level meter includes the first, second guide rod being arranged inside and outside evaporation tank body, liquid level scale is equipped on the second guide rod, annular first magnetic force float is sleeved on the first guide rod, second magnetic force float is sleeved on the second guide rod, first magnetic force float and second magnetic force float are magnetically adsorbed, cleaning generator is also sleeved on the first guide rod, cleaning generator is driven along the first guide rod under the driving of driving mechanism.Lift with liquid level along with the first magnetic property float in evaporation tank body, the second magnetic property float in evaporation tank body and the first magnetic property float are mutually attracted, the position where second magnetic property float stays is the actual height of liquid level in evaporation tank body.Cleaning generator removes salt crystallization, scale on the surface of first guide rod, ensure that first magnetic property float lifts without resistance, and second magnetic property float truly reacts liquid level height.

Description

Technical Field

[0001] This utility model belongs to the field of liquid level detection, specifically relating to a liquid level device for a desulfurization wastewater evaporator. Background Technology

[0002] Desulfurization wastewater, as the final stage of power plant wastewater treatment, has always been a key focus for enterprises and environmental protection departments. With the continuous improvement of environmental protection requirements, more and more enterprises are starting to use evaporation to treat desulfurization wastewater, as evaporation can effectively separate pollutants from desulfurization wastewater.

[0003] Common methods for measuring liquid level in existing evaporator tanks include: First, installing an ultrasonic level sensor at the top of the tank. However, in current desulfurization wastewater evaporation treatment, to reduce energy consumption and save costs, most methods employ negative pressure vacuum evaporation. While a large amount of water evaporates inside the tank, high-salt liquid also moves with the steam. The area above the liquid level in the evaporator tank is a mixture of steam, mist, and micro-droplets, which significantly affects the ultrasonic sensor's detection, rendering it inoperable. Second, installing a pressure sensor at the bottom of the tank to display the liquid level. However, after a period of operation, salt crystals and scale adhere to the surface of the pressure sensor, causing inaccurate readings. Summary of the Invention

[0004] To address the problem of inaccurate instrumentation and malfunction of liquid level measuring devices due to salt crystals and scale buildup, this utility model provides a liquid level device for desulfurization wastewater evaporation tanks.

[0005] The purpose of this utility model is achieved in the following manner: a liquid level device for a desulfurization wastewater evaporator, comprising an evaporator, a desulfurization wastewater inlet, a high-concentration wastewater outlet, a steam inlet, and a steam outlet, the steam outlet being connected to a vacuum pump; a combined liquid level gauge is installed on the evaporator, comprising a first guide rod installed inside the evaporator and a second guide rod installed outside the evaporator, the second guide rod having a liquid level scale; a first annular magnetic float is fitted on the first guide rod, and a second magnetic float is fitted on the second guide rod, the first and second magnetic floats being magnetically attracted to each other; a cleaning generator is also fitted on the first guide rod, the outer diameter of the cleaning generator being adapted to the inner diameter of the annular center of the first magnetic float; the cleaning generator is driven by a drive mechanism to rise and fall along the first guide rod.

[0006] The drive mechanism includes a motor-driven gear, a rack meshing with the gear, and a controller. The rack has teeth on the upper part and is smooth on the lower part, with a cleaning generator connected to the lower end. The controller controls the gear to rotate in the forward and reverse directions.

[0007] The second magnetic float is connected to the traction device, which includes a traction motor and a traction rope. The output shaft of the traction motor is connected to the winding drum. One end of the traction rope is connected to the second magnetic float, and the other end is wound on the winding drum.

[0008] The high-concentration wastewater discharge outlet is connected to a heat exchanger via a circulating water pump.

[0009] The upper and lower ends of the cleaning generator are tapered.

[0010] The cleaning generator has a built-in high-frequency vibrator.

[0011] Compared to existing technologies, this invention features a first guide rod and a first magnetic float inside the evaporator, and a second guide rod and a second magnetic float outside the evaporator. The first magnetic float floats on the liquid surface and is attracted to the second magnetic float outside the tank by magnetic force. The second magnetic float moves up and down along the second guide rod together with the first magnetic float as the liquid level rises and falls. The second guide rod has a liquid level scale, and the position where the second magnetic float stops is the actual liquid level in the evaporator. This combined liquid level gauge is convenient for liquid level measurement. A cleaning generator is also installed on the second guide rod. Driven by a drive mechanism, the cleaning generator moves up and down along the first guide rod to remove salt crystals and scale from the surface of the first guide rod, ensuring that the first magnetic float moves up and down without resistance with the liquid level change on the first guide rod, and ensuring that the second magnetic float accurately reflects the liquid level in the evaporator. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] 1. Evaporator body, 2. Heat exchanger, 3. Circulating water pump, 4. Combined level gauge, 4-1. First magnetic float, 4-2. First guide rod, 4-3. Second guide rod, 4-4. Second magnetic float, 5. Cleaning generator, 5-1. Controller, 5-2. Gear, 5-3. Rack, 6. Vacuum pump, 7. Valve, 8. Traction device, 8-1. Traction rope. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0015] like Figure 1As shown, a liquid level device for a desulfurization wastewater evaporator includes an evaporator 1. The evaporator 1 is provided with a desulfurization wastewater inlet, a high-concentration wastewater outlet, a steam inlet, and a steam outlet. The steam outlet is connected to a vacuum pump 6. The desulfurization wastewater enters the evaporator 1 and then enters the heat exchanger 2 under the action of the circulating water pump 3, where it exchanges heat with the steam and is heated. Then it re-enters the evaporator 1. The steam outlet at the top of the evaporator 1 is connected to the vacuum pump 6. By evacuating the air through the vacuum pump 6, the inside of the evaporator 1 is kept under negative pressure, and a large amount of water vapor is removed from the liquid surface inside the evaporator and discharged from the steam outlet.

[0016] A combined level gauge 4 is installed on the evaporator tank 1. The combined level gauge 4 includes a first guide rod 4-2 installed inside the evaporator tank 1 and a second guide rod 4-3 installed outside the evaporator tank 1. The second guide rod 4-3 is provided with a level scale. A first magnetic float 4-1 with a density of less than 1 is sleeved on the first guide rod 4-2 so that it can float on the water surface. The first magnetic float 4-1 can move up and down along the first guide rod 4-2 with the change of liquid level. A second magnetic float 4-4 is sleeved on the second guide rod 4-3. The first magnetic float 4-1 and the second magnetic float 4-4 are magnetically attracted. Under the action of magnetism, the second magnetic float 4-4 moves up and down synchronously with the first magnetic float 4-1 inside the evaporator tank with the liquid level, maintaining the same horizontal height. The liquid level value inside the evaporator tank can be directly and accurately displayed on the scale of the second guide rod 4-3, so that the evaporation system is always in a high-efficiency and stable operating state.

[0017] As the desulfurization wastewater in evaporator 1 continues to evaporate, its salinity and turbidity increase. A portion of the concentrated liquid is periodically discharged by opening valve 7 at the high-concentration wastewater discharge port. During the continuous evaporation of the desulfurization wastewater, some salt and scale inevitably adhere to the surfaces of the first guide rod 4-2 and the first magnetic float 4-1 within the evaporator. To prevent the first magnetic float 4-1 from being unable to move flexibly with changes in liquid level due to adhesion of crystalline salt and scale to the surfaces of the first guide rod 4-2, a cleaning generator 5 is fitted onto the first guide rod 4-2. Driven by a drive mechanism, the cleaning generator 5 moves up and down along the first guide rod 4-2, removing the crystalline salt and scale from its surface. The outer diameter of the cleaning generator 5 is adapted to the inner diameter of the annular center of the first magnetic float 4-1, allowing it to pass through the annular center without affecting the height of the first magnetic float 4-1. Furthermore, the drive mechanism includes a motor-driven gear 5-2, a rack 5-3 meshing with the gear, and a controller 5-1. The rack 5-3 has teeth on its upper part and a smooth lower part, with the lower end connected to the cleaning generator 5. The controller 5-1 controls the forward and reverse rotation of the gear. The rack 5-3 passes through the top cover of the evaporator tank 1 and is well-sealed with the top cover of the evaporator tank 1. Furthermore, to facilitate the cleaning generator 5 passing through the annular center of the first magnetic float 4-1 to clean the entire first guide rod 4-2, both the upper and lower ends of the cleaning generator 5 are tapered.

[0018] In a further preferred embodiment, the cleaning generator 5 incorporates a built-in high-frequency vibrator (not shown in the figure). This high-frequency vibrator generates high-frequency mechanical vibration via an electric vibration motor. During this vibration, scale or salt deposits on the surface of the guide shaft 4-2 are stripped away, preventing the deposits from continuously increasing and hindering the free floating of the first magnetic float 4-1 with changes in liquid level. The drive cable of the high-frequency vibrator is integrated within the rack 5-3. Crystalline salts and scale on the surfaces of the first guide rod 4-2 and the first magnetic float 4-1 are stripped and detached under the action of high-frequency vibration.

[0019] When sudden changes in air pressure or other special circumstances cause drastic fluctuations in the water level within the evaporator, the first magnetic float 4-1 also fluctuates significantly with the liquid level. The second magnetic float 4-4 may fail to maintain proper magnetic attraction with the first magnetic float 4-1 and slide to the bottom of the second guide rod 4-3, resulting in an inaccurate liquid level display. In this case, the combined liquid level gauge 4 needs adjustment. The specific adjustment measure is to connect the second magnetic float 4-4 to a traction device 8. The traction device 8 includes a traction motor and a traction rope 8-1. The output shaft of the traction motor is connected to a winding drum, one end of the traction rope is connected to the second magnetic float 4-4, and the other end is wound around the winding drum. When the second magnetic float 4-4 slides to the bottom of the second guide rod 4-3, first, take targeted measures according to the specific situation to ensure that the liquid level in the evaporator is stable. Then, start the traction motor and pull the second magnetic float 4-4 upward through the traction rope 8-1. After reaching the top of the second guide rod 4-3, turn off the traction motor and separate the traction rope 8-1 from the second magnetic float 4-4. Under the action of gravity, the second magnetic float 4-4 moves downward along the second guide rod 3 / 4. When it reaches the magnetic influence range of the first magnetic float 4-1, the magnetic force will attract the second magnetic float 4-4 to the horizontal position of the first magnetic float 4-1. At this time, the liquid level device can automatically and accurately display the true liquid level in the evaporator again.

[0020] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A liquid level device for a desulfurization wastewater evaporator, comprising an evaporator (1), wherein the evaporator (1) is provided with a desulfurization wastewater inlet, a high-concentration wastewater outlet, a steam inlet, and a steam outlet, and the steam outlet is connected to a vacuum pump (6), characterized in that: A combined liquid level gauge (4) is installed on the evaporator tank (1). The combined liquid level gauge (4) includes a first guide rod (4-2) installed inside the evaporator tank (1) and a second guide rod (4-3) installed outside the evaporator tank (1). The second guide rod (4-3) is provided with a liquid level scale. A first magnetic float (4-1) is sleeved on the first guide rod (4-2), and a second magnetic float (4-4) is sleeved on the second guide rod (4-3). The first magnetic float (4-1) and the second magnetic float (4-4) are magnetically attracted. A cleaning generator (5) is also sleeved on the first guide rod (4-2). The outer diameter of the cleaning generator (5) is adapted to the inner diameter of the annular center of the first magnetic float (4-1). The cleaning generator (5) moves up and down along the first guide rod (4-2) under the drive of the drive mechanism.

2. The liquid level device for the desulfurization wastewater evaporator tank according to claim 1, characterized in that: The drive mechanism includes a motor-driven gear (5-2), a rack (5-3) meshing with the gear, and a controller (5-1). The rack (5-3) has teeth on the upper part and smooth on the lower part, and the lower end is connected to a cleaning generator (5). The controller (5-1) controls the gear to rotate in the forward and reverse directions.

3. The liquid level device for the desulfurization wastewater evaporator tank according to claim 1, characterized in that: The second magnetic float (4-4) is connected to the traction device (8), which includes a traction motor and a traction rope (8-1). The output shaft of the traction motor is connected to the winding drum. One end of the traction rope is connected to the second magnetic float (4-4), and the other end is wound on the winding drum.

4. The liquid level device for the desulfurization wastewater evaporator according to claim 1, characterized in that: The high-concentration wastewater discharge outlet is connected to the heat exchanger (2) via a circulating water pump (3).

5. The liquid level device for the desulfurization wastewater evaporator according to claim 1, characterized in that: The upper and lower ends of the cleaning generator (5) are tapered.

6. The liquid level device for the desulfurization wastewater evaporator according to claim 1 or 5, characterized in that: Cleaning generator (5) has a built-in high-frequency vibrator.

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