Novel liquid level measuring device for boiler drum

Abstract

The utility model belongs to the technical field of liquid level measuring devices, and particularly relates to a novel boiler drum liquid level measuring device which comprises a drum, a positive pressure side primary valve is fixedly installed on the lower portion of the right side of the drum, and a negative pressure side primary valve is fixedly installed on the upper portion of the right side of the drum. The right end of the positive pressure side primary valve is fixedly connected with a steam drum positive pressure side flange, the right end of the negative pressure side primary valve is fixedly connected with a steam drum negative pressure side flange, the right end of the steam drum positive pressure side flange is fixedly connected with a single-chamber container, and the single-chamber container is fixedly connected with the steam drum negative pressure side flange. According to the utility model, the single-chamber container is used as a pressure tapping element, freeze injury caused by a blind head is avoided, scale is not easy to block a pressure tapping port, and the pressure tapping device has sewage discharge capability and prevents the transmitter from being frozen after a boiler is stopped in winter. And besides sewage discharge is needed when the furnace is shut down in winter, daily maintenance and flange disassembly and assembly are not needed, heat tracing is avoided, and freeze injury is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level measuring devices, and particularly relates to a liquid level measuring device for a new type of boiler steam drum. Background Technique

[0002] The boiler type heat exchanger is an important part of heat exchange in production. It converts waste heat into steam for use, playing a role in energy conservation and consumption reduction. The boiler type heat exchanger is generally arranged according to the process flow line of the production device. On the device framework, the conventional double-chamber balanced container has problems such as inaccurate measurement caused by too high tracing temperature, large data fluctuations, icing at the differential pressure transmitter when the tracing temperature is low, and the positive and negative pressure tapping pipes being blind ends and being easily frozen at extremely low temperatures. Content of the Utility Model

[0003] The purpose of the utility model is to provide a liquid level measuring device for a new type of boiler steam drum, which solves the problems that the conventional double-chamber balanced container has inaccurate measurement caused by too high tracing temperature, large data fluctuations, icing at the differential pressure transmitter when the tracing temperature is low, and the positive and negative pressure tapping pipes being blind ends and being easily frozen at extremely low temperatures.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A liquid level measuring device for a new type of boiler steam drum, including a steam drum. A positive pressure side primary valve is fixedly installed at the lower right side of the steam drum, and a negative pressure side primary valve is fixedly installed at the upper right side of the steam drum. The right end of the positive pressure side primary valve is fixedly connected to a steam drum positive pressure side flange, and the right end of the negative pressure side primary valve is fixedly connected to a steam drum negative pressure side flange. The right end of the steam drum positive pressure side flange is fixedly connected to a single-chamber container, and the single-chamber container is fixedly connected to the steam drum negative pressure side flange.

[0005] Preferably, a drain valve is arranged at the lower end of the single-chamber container. By arranging the drain valve, the inside of the single-chamber container is convenient for sewage discharge.

[0006] Preferably, a transmitter positive pressure side mating flange is fixedly installed at the lower right side of the single-chamber container. By arranging the transmitter positive pressure side mating flange, it is used to maintain the water level inside the single-chamber container.

[0007] Preferably, a transmitter negative pressure side mating flange is fixedly installed at the upper right side of the single-chamber container. By arranging the transmitter negative pressure side mating flange, it is used to install a ball valve.

[0008] The beneficial effects of the utility model are as follows:

[0009] The utility model adopts a single-chamber container as a pressure-taking element, which will not cause freezing damage due to being a blind end, is not easy to cause scale blockage of the pressure-taking port, has the ability to discharge sewage, and can prevent the transmitter from being frozen after the boiler is shut down in winter. Except for the need to discharge sewage when the boiler is shut down in winter, no daily maintenance is required. The flange can be disassembled and assembled, and heat tracing is not required, so there is no freezing damage. Brief Description of the Drawings

[0010] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 For the utility model Figure 1 schematic diagram of the single-chamber container;

[0012] Figure 3 For the utility model Figure 2 top view;

[0013] Figure 4 For the utility model Figure 2 right view.

[0014] In the figure: 1. steam drum; 2. positive pressure side primary valve; 3. negative pressure side primary valve; 4. steam drum positive pressure side flange; 5. steam drum negative pressure side flange; 6. single-chamber container; 7. sewage discharge valve; 8. transmitter positive pressure side mating flange; 9. transmitter negative pressure side mating flange. Detailed Embodiment

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0016] Please refer to Figures 1-4, A liquid level measuring device for a new type of boiler drum, including a drum 1. A positive pressure side primary valve 2 is fixedly installed at the lower right of the drum 1, and a negative pressure side primary valve 3 is fixedly installed at the upper right of the drum 1. The right end of the positive pressure side primary valve 2 is fixedly connected to a drum positive pressure side flange 4, and the right end of the negative pressure side primary valve 3 is fixedly connected to a drum negative pressure side flange 5. The right end of the drum positive pressure side flange 4 is fixedly connected to a single chamber container 6, and the single chamber container 6 is fixedly connected to the drum negative pressure side flange 5. A drain valve 7 is provided at the lower end of the single chamber container 6. By providing the drain valve 7, it is convenient to drain sewage in the single chamber container 6. A transmitter positive pressure side mating flange 8 is fixedly installed at the lower right of the single chamber container 6. By providing the transmitter positive pressure side mating flange 8, it is used to maintain the water level in the single chamber container 6. A transmitter negative pressure side mating flange 9 is fixedly installed at the upper right of the single chamber container 6. By providing the transmitter negative pressure side mating flange 9, it is used to install a ball valve.

[0017] The specific implementation process of the present utility model is as follows: The single chamber container 6 is cylindrical, with a diameter of 80 cm and a height slightly greater than the distance between the positive pressure side primary valve 2 and the negative pressure side primary valve 3 installed on the drum 1. On one side, the drum positive pressure side flange 4 and the drum negative pressure side flange 5 are installed and connected to the positive and negative pressure ports of the drum 1. On the other side, the transmitter positive pressure side mating flange 8 and the transmitter negative pressure side mating flange 9 are installed at the same height and connected to a double flange differential pressure transmitter. The upper side is sealed, and the lower side is installed with a ball valve for sewage discharge. According to the principle of communicating vessels, the water level will be consistent with the water level in the drum 1. At the same time, the steam in the drum 1 can automatically condense into water after entering the single chamber container 6, forming the flow of water, ensuring that the temperature of the single chamber container 6 is in a relatively high and stable state. With the change of the outdoor temperature, the temperature of the single chamber container 6 changes from 95 degrees Celsius to 85 degrees Celsius, and the density of water changes little, so the measurement is accurate;

[0018] The double flange differential pressure transmitter measures the liquid level in the container by using the pressure difference generated by the self - gravity of the liquid. The low - pressure side above measures the steam pressure, while the high - pressure side below measures the pressure generated by the liquid level in the container plus the steam pressure. The pressure difference between the high - and low - pressure sides is the pressure generated by the liquid level;

[0019] The positive and negative pressure tapping flanges of the double flange differential pressure transmitter are not on the same horizontal plane. Since the silicone oil inside the capillary will generate a pressure difference, this pressure difference value is removed as the static pressure difference value. It is necessary to zero the meter head when the single chamber container 6 is empty;

[0020] Let △P be the differential pressure signal received by the transmitter, P0 be the internal pressure of the container, P + be the pressure on the positive pressure side of the transmitter, P - be the pressure on the negative pressure side of the transmitter; ρ be the density of the liquid in the container; g be the acceleration due to gravity; h be the height of the liquid level; h1 be the height difference between the positive and negative pressures.

[0021] Then there is:

[0022] P + = P0 + ρgh

[0023] P - = P0

[0024] ΔP = P + - P - = ρgh

[0025] When the liquid level is 0, the differential pressure ΔP measured by the differential pressure transmitter is 0, and the output current is 4 mA. When the liquid level is h1, the differential pressure ΔP measured by the differential pressure transmitter is ρgh1, and the output current is 20 mA.

[0026] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid level measuring device for a new type of boiler drum, comprising a boiler drum (1), characterized in that: A positive pressure side primary valve (2) is fixedly installed at the lower right of the steam drum (1), a negative pressure side primary valve (3) is fixedly installed at the upper right of the steam drum (1), the right end of the positive pressure side primary valve (2) is fixedly connected to a steam drum positive pressure side flange (4), the right end of the negative pressure side primary valve (3) is fixedly connected to a steam drum negative pressure side flange (5), the right end of the steam drum positive pressure side flange (4) is fixedly connected to a single-chamber container (6), and the single-chamber container (6) is fixedly connected to the steam drum negative pressure side flange (5).

2. The liquid level measuring device for a novel boiler drum according to claim 1, characterized in that: A blowdown valve (7) is arranged at the lower end of the single-chamber container (6).

3. The liquid level measuring device for a novel boiler steam drum according to claim 1, wherein: A transmitter positive pressure side mating flange (8) is fixedly installed at the lower right of the single-chamber container (6).

4. A liquid level measuring device for a novel boiler steam drum according to claim 1, characterized in that: A transmitter negative pressure side mating flange (9) is fixedly installed at the upper right of the single-chamber container (6).

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