Built-in balancing container for water level of steam drum

Abstract

The utility model provides a built-in water level balancing container for a steam drum. The blow-down valve is installed at the bottom of the louvered heat dissipation type condenser, so that impurities can be smoothly discharged after the condenser runs for a long time, the situation that the condensation effect of the condenser is affected due to reduction of the steam amount in a tank body is avoided, meanwhile, no residual dead water is left in the condenser after a boiler is shut down can be guaranteed, and the situation that the service life of the condenser is affected due to the fact that the interior of the condenser is frozen in winter is avoided. The flow stabilizer is additionally arranged at the overflow hole of the balance tank, airflow impact of the cyclone separator is reduced, pressure stability of the positive pressure side is guaranteed, and steam drum water level measurement is accurate.

Description

Technical Field

[0001] The utility model relates to an internal-mounted balancing container for drum water level, which is a measuring device for the drum water level of a boiler and belongs to the supporting products of the boiler. Background Art

[0002] The existing internal-mounted balancing container for drum water level is composed of a steam-side sampling pipe 1, an outlet pipe 2, a water-side sampling pipe 3, a secondary instrument 4, a differential pressure transmitter 5, a drum 6, a balancing tank 7, a water-side sampler 8, an external water injection device 9, a louvered heat dissipation condenser 10, and a high-pressure stop valve 11. The louvered heat dissipation condenser 10 is connected to the drum 6 through the steam-side sampling pipe 1. One end of the louvered heat dissipation condenser 10 is connected to the external water injection device 9. The balancing tank 7 is installed inside the drum 6 and connected to the steam-side sampling pipe 1. When the boiler is in operation, the saturated steam in the upper part of the drum 6 enters the louvered heat dissipation condenser 10, releases the vaporization heat, condenses into saturated water, and flows back to the balancing tank 7. A welding outlet pipe 2 is arranged at the lower part of the balancing tank 7. The outlet pipe 2 passes through the inside of the water-side sampling pipe 3 of the drum 6 and is connected to the differential pressure transmitter 5 connected to the secondary instrument 4 at the same time as the water-side sampling pipe 3. The differential pressure transmitter 5 senses the pressure difference between the outlet pipe 2 and the water-side sampling pipe 3 and sends it to the secondary instrument 4 for temperature and pressure compensation calculation to obtain the water level value inside the drum 6. A water-side sampler 8 is installed on the water-side sampling pipe 3 inside the drum 6.

[0003] The external water injection device 9 can establish a positive pressure side measurement scale in the cold state and be isolated by the high-pressure stop valve 11 in the hot state; the louvered heat dissipation condenser 10 can accelerate the establishment of the positive pressure side measurement scale in the hot state; the water-side sampler 8 can play a buffering role, reduce the impact of the water flow in the drum, and reduce the entry of impurities into the water-side sampling pipe 3.

[0004] Its disadvantages are as follows: After the boiler runs for a long time, dust and rust impurities will gradually accumulate inside the louvered heat dissipation condenser tank body. Without a sewage outlet, the impurities cannot be discharged, resulting in a large amount of dirt accumulating inside the condenser tank body, reducing the amount of steam inside the tank body, affecting the condensation effect of the condenser, affecting the pressure transmission, and thus affecting the measurement result; there is no sewage outlet on the louvered heat dissipation condenser tank body. After the boiler stops running in winter, there will be some stagnant water inside the tank body that cannot be drained. In cold northern regions, the on-site temperature can reach below -20°C, causing the inside of the condenser to freeze. The toughness of the steel pipe will decrease, making it prone to cracks and brittle fractures, and also affecting its service life.

[0005] The position of the overflow hole at the front end of the balancing tank is easily affected by the airflow of the cyclone separator, causing pressure fluctuations in the positive pressure side pipeline and affecting the measurement result of the drum water level. Summary of the Invention

[0006] The purpose of the present utility model is to provide an internal equilibrium container for drum water level. A blowdown valve is installed at the bottom of the louvered heat dissipation condenser to ensure that impurities can be smoothly discharged after long-term operation of the condenser, avoiding the reduction of the steam volume inside the tank body, which will affect the condensation effect of the condenser. At the same time, it can ensure that there is no remaining stagnant water in the condenser after the boiler is shut down, avoiding internal icing of the condenser in winter and affecting its service life. A flow stabilizer is installed at the overflow hole of the equilibrium tank to reduce the airflow impact of the cyclone separator, ensure the stability of the positive pressure side pressure, and accurately measure the drum water level.

[0007] The present utility model is composed of a steam side sampling pipe 1, a lead-out pipe 2, a water side sampling pipe 3, a secondary instrument 4, a differential pressure transmitter 5, a drum 6, an equilibrium tank 7, a water side sampler 8, an external water injection device 9, a louvered heat dissipation condenser 10, a high-pressure stop valve 11, a condenser blowdown valve 12, and an equilibrium tank flow stabilizer 13. The present utility model is realized through the following technical solutions: The louvered heat dissipation condenser 10 is connected to the drum 6 through the steam side sampling pipe 1. One end of the louvered heat dissipation condenser 10 is connected to the external water injection device 9. The bottom of the louvered heat dissipation condenser 10 is connected to the condenser blowdown valve 12. The equilibrium tank 7 is installed inside the drum 6 and connected to the steam side sampling pipe 1. The equilibrium tank flow stabilizer 13 is installed at the overflow hole of the equilibrium tank 7. When the boiler is operating, the saturated steam in the upper part of the drum 6 enters the louvered heat dissipation condenser 10, releases the vaporization heat, condenses into saturated water, and flows back to the equilibrium tank 7. The lower part of the equilibrium tank 7 is welded with a lead-out pipe 2. The lead-out pipe 2 passes through the inside of the water side sampling pipe 3 of the drum 6 and is connected to the differential pressure transmitter 5 connected to the secondary instrument 4 together with the water side sampling pipe 3. The differential pressure transmitter 5 senses the pressure difference between the lead-out pipe 2 and the water side sampling pipe 3 and sends it to the secondary instrument 4 for temperature and pressure compensation calculation to obtain the water level value inside the drum 6. A water side sampler 8 is installed on the water side sampling pipe 3 inside the drum 6.

[0008] The external water injection device 9 can establish a positive pressure side measurement scale in the cold state and be isolated by the high-pressure stop valve 11 in the hot state; the louvered heat dissipation condenser 10 can accelerate the establishment of the positive pressure side measurement scale in the hot state; the water side sampler 8 can play a buffering role, reduce the impact of the water flow in the drum, and reduce the entry of impurities into the water side sampling pipe 3.

[0009] The condenser blowdown valve 12 ensures that impurities can be smoothly discharged after long-term operation of the louvered heat dissipation condenser 10, avoiding the reduction of the steam volume inside the tank body, which will affect the condensation effect of the condenser. At the same time, it can ensure that there is no remaining stagnant water in the condenser after the boiler is shut down, avoiding internal icing of the condenser in winter and affecting its service life.

[0010] The equilibrium tank flow stabilizer 13 is installed at the overflow hole of the equilibrium tank, reduces the airflow impact of the cyclone separator, ensures the stability of the positive pressure side pressure, and accurately measures the drum water level.

[0011] The beneficial effects of the present utility model:

[0012] A drain valve is installed at the bottom of the louvered heat dissipation condenser to ensure that impurities can be smoothly discharged after long-term operation of the condenser, avoiding a reduction in the amount of steam inside the tank, which will affect the condensation effect of the condenser. At the same time, it can ensure that there is no remaining stagnant water in the condenser after the furnace is stopped, avoiding internal icing of the condenser in winter and affecting its service life.

[0013] A flow stabilizer is installed at the overflow hole of the balance tank to reduce the airflow impact of the cyclone separator, ensure the stability of the positive pressure side pressure, and accurately measure the water level in the steam drum. Description of the Drawings

[0014] Figure 1 : Schematic structural diagram of the original steam drum water level with an internal equilibrium vessel.

[0015] In the figure: 1 steam side sampling pipe, 2 lead-out pipe, 3 water side sampling pipe, 4 secondary instrument, 5 differential pressure transmitter, 6 steam drum, 7 balance tank, 8 water side sampler, 9 external water injection device, 10 louvered heat dissipation condenser, 11 high-pressure stop valve.

[0016] Figure 2 : Schematic structural diagram of the present utility model.

[0017] In the figure: 1 steam side sampling pipe, 2 lead-out pipe, 3 water side sampling pipe, 4 secondary instrument, 5 differential pressure transmitter, 6 steam drum, 7 balance tank, 8 water side sampler, 9 external water injection device, 10 louvered heat dissipation condenser, 11 high-pressure stop valve, 12 condenser drain valve, 13 balance tank flow stabilizer. Detailed Embodiment

[0018] Such as Figure 2As shown in the figure, the steam drum 6 is connected to the louvered heat dissipation condenser 10 through the steam side sampling pipe 1. The bottom of the louvered heat dissipation condenser 10 is connected to the blowdown valve 12. The saturated steam enters the louvered heat dissipation condenser 10 through the steam side sampling pipe 1, releases the vaporization heat and condenses into saturated water. Until the water level in the louvered heat dissipation condenser 10 reaches the horizontal level of the lower edge of the inner diameter of the steam side sampling pipe 1, the excess condensed water then flows back to the balance tank 7 through the steam side sampling pipe 1. A balance tank stabilizer 13 is installed at the overflow hole of the balance tank 7. A lead-out pipe 2 is welded at the lower part of the balance tank 7. The lead-out pipe 2 passes through the inside of the water side sampling pipe 3 of the steam drum 6 and is connected to the differential pressure transmitter 5. In this way, the water in the lead-out pipe 2 and the balance tank 7 forms a positive pressure sensed by the differential pressure transmitter 5, and this positive pressure is used as a positive pressure side measurement scale; the water side sampling pipe 3 of the steam drum 6 is also connected to the differential pressure transmitter 5, so that a negative pressure sensed by the differential pressure transmitter 5 is formed; after the differential pressure transmitter 5 senses the positive pressure and the negative pressure, it outputs a differential pressure signal, which is then connected to the secondary instrument 4. After the temperature and pressure compensation calculation inside the secondary instrument 4, the water level in the steam drum can be obtained. An external water injection device 9 is installed at one end of the louvered heat dissipation condenser 10, which can establish a positive pressure side measurement scale before the steam drum 6 is filled with water, and the external water injection device 9 is isolated by the high-pressure stop valve 11 during the hot state. The advantage of the louvered heat dissipation condenser 10 is that it can accelerate the condensation speed of the saturated steam and ensure the rapid establishment of the positive pressure side measurement scale. A water side sampler 8 is installed on the water side sampling pipe 3 inside the steam drum 6, which can prevent the water flow impact inside the steam drum 6, and the impurities inside the steam drum 6 are not easy to enter the inside of the water side sampling pipe 3, ensuring the normal pressure transmission of the entire measurement system.

Claims

1. A drum water level internal balance container, comprising a steam side sampling tube (1), an outlet tube (2), a water side sampling tube (3), a secondary instrument (4), a differential pressure transmitter (5), a drum (6), a balance tank (7), a water side sampler (8), an external water injection device (9), a shutter type heat dissipation condenser (10), a high pressure stop valve (11), a condenser drain valve (12), and a balance tank flow stabilizer (13), wherein the characteristics are: The louvered heat dissipation type condenser (10) is connected to the steam drum (6) through a steam side sampling tube (1), one end of the louvered heat dissipation type condenser (10) is connected to an external water injection device (9), the bottom of the louvered heat dissipation type condenser (10) is connected to a condenser drain valve (12), a balance tank (7) is installed inside the steam drum (6) and connected to the steam side sampling tube (1), a balance tank flow stabilizer (13) is installed at the overflow hole of the balance tank (7), and when the boiler is running, the steam drum (6) The saturated steam in the upper part of the inner part enters the louvered heat dissipation condenser (10), releases the heat of vaporization, condenses into saturated water, and flows back to the balance tank (7). The lower part of the balance tank (7) is welded with an outlet pipe (2), which passes through the inside of the water side sampling pipe (3) of the drum (6) and is connected to the differential pressure transmitter (5) connected to the secondary instrument (4) at the same time as the water side sampling pipe (3). A water side sampler (8) is installed on the water side sampling pipe (3) inside the drum (6).

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