A reference water column sampling stabilization device

Abstract

The present invention discloses a reference water column sampling stabilization device, which has a structure that a water trough is fixedly arranged on the periphery of a water bucket, a protective cover is embedded with the water bucket and the water trough, one side of the protective cover is fixedly connected to a steam side condensate guide pipe, and the other end of the steam side condensate guide pipe is fixedly connected to an external condensing tank; the other side of the external condensing tank is fixedly connected to a spare positive pressure sampling pipe, the other end of the spare positive pressure sampling pipe is connected to a positive pressure guide pipe, and the other end of the positive pressure guide pipe is detachably connected to a differential pressure transmitter; the bottom of the water bucket is fixedly connected to a connecting pipe, the other end of the connecting pipe is connected to the positive pressure guide pipe, the pipeline of the connecting pipe close to the water bucket is located in the steam drum, and the rest of the connecting pipe is located outside the steam drum, and a double-layer casing is sleeved on the connecting pipe outside the steam drum, the pipe wall of the double-layer casing is connected to a negative pressure guide pipe, and the negative pressure guide pipe is detachably connected to the differential pressure transmitter. The present invention can solve the difficulty of measuring the water column temperature and the difficulty of maintenance, and has a stable static pressure.

Description

Technical Field

[0001] The invention relates to the technical field of drum water level measurement, and in particular to a reference water column sampling stabilization device. Background Art

[0002] The drum water level is a very important monitoring parameter for medium and high pressure boilers and above. Controlling the normal water level in the drum within a certain allowable range is one of the necessary conditions to ensure the safe operation of the boiler and steam turbine.

[0003] At present, the commonly used methods for measuring drum water level are: mica two-color water level gauge, electric contact water level gauge and differential pressure water level gauge. Among them, the mica two-color water level gauge can display intuitively on the spot, the indication is reliable, and the industrial television technology is used to realize remote monitoring in the main control room; the electric contact water level gauge does not indicate continuously during measurement; the differential pressure water level gauge is the most commonly used and can also be used as the adjusted parameter of water level regulation.

[0004] The principle of the differential pressure water level gauge is to convert the drum water level into a differential pressure signal through a balance container, and use a differential pressure gauge to measure the size of the differential pressure, thereby obtaining the height of the water level. The differential pressure drum water level gauges currently used are usually single-chamber balance containers and double-chamber balance containers. The single-chamber balance container has been innovated and is divided into external types such as Figure 1 As shown and built-in Figure 2 The external type has a simple structure and is easy to install and maintain, but it is greatly affected by the external ambient temperature; the internal type has a complex structure, cumbersome installation, and difficult maintenance, but it is not affected by the external ambient temperature.

[0005] Therefore, it is very important to develop a reference water column sampling stabilization device that can solve the problems of difficult water column temperature measurement and maintenance and has a stable static pressure. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention proposes a reference water column sampling stabilization device, which can solve the problems of difficult water column temperature measurement and maintenance, and at the same time has a stable static pressure.

[0007] The technical solution of the present invention is achieved in this way:

[0008] A reference water column sampling stabilization device comprises a protective cover, a water trough, a water bucket, a steam-side condensate guide pipe, a connecting pipe, a double-layer sleeve, an external condensate tank, a spare positive pressure sampling pipe, a positive pressure guide pipe, a negative pressure guide pipe and a differential pressure transmitter; a water trough is fixedly arranged on the periphery of the water bucket, the protective cover is embedded with the water bucket and the water trough, one side of the protective cover is fixedly connected to the steam-side condensate guide pipe, and the other end of the steam-side condensate guide pipe is fixedly connected to the external condensate tank; the other side of the external condensate tank is fixedly connected to the spare positive pressure sampling pipe, the spare The other end of the positive pressure sampling tube is connected to the positive pressure guide tube, and the other end of the positive pressure guide tube is detachably connected to the differential pressure transmitter; the bottom of the water bucket is fixedly connected to a connecting tube, and the other end of the connecting tube is connected to the positive pressure guide tube, and the pipeline of the connecting tube close to the water bucket is located in the steam drum, and the rest of the connecting tube is located outside the steam drum. The connecting tube outside the steam drum is covered with a double-layer casing, one end of the double-layer casing is connected to the steam drum, and the other end of the double-layer casing is connected to the negative pressure guide tube, and the negative pressure guide tube is detachably connected to the differential pressure transmitter.

[0009] Preferably, the protective cover is a cylindrical cover body with a closed upper end and an open lower end, and the lower end is buckled on the water trough and covers the water bucket at the same time; four ventilation holes are opened on the side wall of the protective cover higher than the water trough and the water bucket, and six semicircular holes are opened on the lower edge of the side of the protective cover to buckle at the bottom of the water trough to form a water hole; a hole is opened in the part of the side of the protective cover higher than the water trough and lower than the four ventilation holes to enter the condensate diversion pipe.

[0010] Preferably, the water bucket is a box structure, and the side wall of the water bucket is provided with a plurality of openings so that the height of the lower edge of the opening is consistent with the height of the upper edge of the water trough. At the same time, a partition is embedded in the water bucket, the upper edge of the partition is at the same horizontal height as the upper edge of the water trough, and a small hole is opened in the middle of the partition.

[0011] Preferably, the lower end of the water trough is located in the middle of the side wall of the water bucket.

[0012] Preferably, the steam-side condensate guide pipe is provided with a through hole, and the through hole is located inside the steam drum.

[0013] Preferably, a switch valve is provided on the steam-side condensate guide pipe and is located outside the steam drum and close to the external condensing tank.

[0014] Preferably, the included angle between the pipe section between the switch valve on the steam-side condensate guide pipe and the external condensing tank and the steam-side condensate guide pipe is an oblique angle, and the oblique angle is 155-165 degrees.

[0015] Preferably, the included angle between the switch valve on the steam-side condensate guide pipe and the pipe section between the external condensate tank and the side wall of the external condensate tank is an oblique angle, and the oblique angle is 70 degrees.

[0016] Preferably, a switch valve is installed on the upper part of the connection between the spare positive pressure sampling tube and the connecting pipe; the connecting pipe is also provided with a switch valve located outside the steam drum and on the side of the double-layer casing away from the steam drum; the negative pressure guide pipe is provided with a switch valve.

[0017] Preferably, the other end of the spare positive pressure sampling tube is connected to the positive pressure guide tube through a switch valve.

[0018] The present invention has the following beneficial effects: the reference water column sampling stabilization device of the present invention is a supporting component of a built-in balanced container water level gauge, and has the advantage that the water columns on the positive and negative pressure sides are always in the saturated water environment of the same container, thus solving the problem of difficult water column temperature measurement; at the same time, the reference water column is protected by the protective cover and the double-ring condensed water protection of the water accumulation tank, which, on the one hand, overcomes the factors such as shutdown and long shutdown time that cause the reference water column to be evaporated, and the next time the boiler is ignited, the water level measurement value has a large deviation, causing the water level automatic protection system to be unable to be put into operation; on the other hand, in normal operation, it reduces airflow interference, damps the condensed water from directly impacting the static pressure head water column, thereby obtaining a stable static pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of an external single-chamber balancing container in the prior art, in which 1 is a steam drum; 6 is a steam-side condensate guide pipe; 7 is an external condensate tank; 9 is a negative pressure guide pipe; 10 is a positive pressure guide pipe; and 11 is a differential pressure transmitter.

[0020] Figure 2 It is a schematic diagram of the structure of a built-in single-chamber balancing container in the prior art, in which 1 is a steam drum; 4 is a water bucket; 5 is a connecting pipe; 6 is a steam-side condensate guide pipe; 7 is an external condensate tank; 8 is a spare positive pressure sampling tube; 12 is a double-layer casing; 9 is a negative pressure guide pipe; 10 is a positive pressure guide pipe; 11 is a differential pressure transmitter.

[0021] Figure 3 This is a structural schematic diagram of a reference water column sampling and stabilization device of the present invention, in which 1 is a steam drum; 2 is a water storage tank; 3 is a protective cover; 4 is a water bucket; 5 is a connecting pipe; 6 is a steam-side condensate guide pipe; 7 is an external condensation tank; 8 is a spare positive pressure sampling tube; 9 is a negative pressure guide pipe; 10 is a positive pressure guide pipe; 11 is a differential pressure transmitter; 12 is a double-layer casing; and 13 is a partition.

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the protective cover 3 of the present invention.

[0023] Figure 5It is a front view structural schematic diagram of the protective cover 3 of the present invention.

[0024] Figure 6 It is a schematic structural diagram of the water bucket 4, the water collection tank 2 and the protective cover 3 of the present invention being embedded in each other. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical scheme of the present invention is now described in detail below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0026] Example 1

[0027] like Figures 3 to 6 As shown, the reference water column sampling stabilization device of the present invention is a supporting product of a water level measuring device, comprising: a protective cover 3, a water storage tank 2, a water bucket 4, a steam side condensate guide pipe 6, a connecting pipe 5, a double-layer sleeve 12, an external condensation tank 7, a spare positive pressure sampling tube 8, a positive pressure guide pipe 10, a negative pressure guide pipe 9 and a differential pressure transmitter 11.

[0028] A water trough 2 is fixedly provided on the periphery of the water bucket 4, and the upper edge of the water bucket 4 is at the same horizontal height as the upper edge of the water trough 2, and the height of the water trough 2 is half of the height of the water bucket 4, that is, the lower end of the water trough 2 is located in the middle of the side wall of the water bucket 4; the protective cover 3 is embedded with the water bucket 4 and the water trough 2, and the protective cover 3 is a cylindrical cover body with a closed upper end and an open lower end, and the lower end is buckled on the water trough 2 and covers the water bucket 4 at the same time; four ventilation holes are opened on the side of the protective cover 3 which is higher than the water trough 2 and the side wall of the water bucket 4, and six semicircular holes are opened on the lower edge of the side of the protective cover 3 which are buckled at the bottom of the water trough 2 to form a water hole; a hole is opened in the part of the side of the protective cover 3 which is higher than the water trough 2 and lower than the four ventilation holes to enter the condensate guide pipe 6. The water hole in the protective cover 3 is lower than the water trough 2, and the air hole is higher than the water trough 2, so as to avoid uneven pressure inside and outside the water bucket 4, ensure that the condensed water flows smoothly into the water trough 2 and the water bucket 4, and finally fill the water bucket 4 and the water trough 2, and the excess condensed water overflows the water trough 2, forming a protective water ring with a stable height, while preventing water droplets or steam airflow from directly impacting the water bucket 4.

[0029] The water bucket 4 is a box structure, and the side wall of the water bucket 4 is provided with a plurality of openings (the present invention provides 4 openings), so that the height of the lower edge of the opening is consistent with the height of the upper edge of the water trough 2, and a partition 13 is embedded in the water bucket 4, the upper edge of the partition 13 is at the same horizontal height as the upper edge of the water trough 2, and a small hole is opened in the middle of the partition 13, which can not only ensure that the condensed water flows smoothly into the connecting pipe 5, but also control the evaporation amount. Due to the special structure of the protective cover 3, double protection is formed, so that the reference water column in the water bucket 4 is always at a stable height.

[0030] One side of the protective cover 3 is fixedly connected to the steam-side condensate water guide pipe 6, and the other end of the steam-side condensate water guide pipe 6 is fixedly connected to the external condensate tank 7. The condensate generated by the external condensate tank 7 is introduced into the water storage tank 2 and the water bucket 4 through the steam-side condensate water guide pipe 6. A through hole is provided on the steam-side condensate water guide pipe 6, and the through hole is located inside the steam drum 1. A switch valve is provided on the steam-side condensate water guide pipe 6 and is located outside the steam drum 1 near the external condensate tank 7. The pipe section between the switch valve on the steam-side condensate water guide pipe 6 and the external condensate tank 7 The included angle with the steam side condensate guide pipe 6 is an oblique angle, the oblique angle is 155-165 degrees, and the best is 160 degrees. The included angle between the switch valve on the steam side condensate guide pipe 6 and the pipe section of the external condensate tank 7 and the side wall of the external condensate tank 7 is an oblique angle, and the oblique angle is 70 degrees. When the condensed water generated by the external condensate tank 7 flows into the water trough 2 and the water bucket 4 through the condensed water guide pipe 6, and finally fills the water bucket 4 and the water trough 2, the excess condensed water overflows the water trough 2, forming a protective water ring with a stable height, while preventing water droplets or steam airflow from directly impacting the water bucket 4.

[0031] The other side of the external condensation tank 7 is fixedly connected to a spare positive pressure sampling tube 8, the other end of which is connected to a positive pressure guide tube 10 through a switch valve, and the other end of which is detachably connected to a differential pressure transmitter 11; the bottom of the water bucket 4 is fixedly connected to a connecting tube 5, the other end of which is connected to the positive pressure guide tube 10, the connection point is located below the switch valve of the spare positive pressure sampling tube 8, and the connecting tube 5 is close to the pipeline position of the water bucket 4. In the steam drum 1, the rest of the connecting pipe 5 is located outside the steam drum 1, and the connecting pipe 5 outside the steam drum 1 is sleeved with a double-layer casing 12, and the double-layer casing 12 is connected to the steam drum 1. The connecting pipe 5 is also provided with a switch valve located outside the steam drum 1 and on the side of the double-layer casing 12 away from the steam drum 1; the pipe wall of the double-layer casing 12 is connected to the negative pressure guide pipe 9, and the negative pressure guide pipe 9 is provided with a switch valve, and the negative pressure guide pipe 9 is detachably connected to the differential pressure transmitter 11.

[0032] The connecting pipe 5, double-layer sleeve 12, negative pressure guide pipe 9 and positive pressure guide pipe 10 transmit the static pressure of the water column to the differential pressure transmitter 11. When the steam flows through the external condenser 7, condensed water is formed through the cold and heat exchange, and flows into the water tank 2 and the water bucket 4 through the steam side condensed water guide pipe 6. When the water tank 2 and the water bucket 4 are filled, the water higher than the water tank 2 automatically flows out, thereby forming a stable static pressure water column.

[0033] Working process:

[0034] like Figure 3As shown, a is saturated steam, b is condensed water generated by the external condenser 7, and c is steam formed by free evaporation of condensed water. During the operation of the drum, saturated steam a continuously flows into the external condenser 7, and condensed water is continuously generated through heat exchange and injected into the external condenser 7. When the condensed water is higher than the condensed water guide pipe 6, the condensed water b flows into the water trough 2 and the water bucket 4, and finally fills the water trough 2 and the water bucket 4, and the excess condensed water overflows the water trough 2. Since the steam inside the drum is always in a flowing state, the condensed water b in the water bucket 4 will evaporate freely c. At the same time, the condensed water b in the water bucket 4 is wrapped by the protective cover 3 and the steam flow rate is controlled, so that the flow rate of free evaporation c of the condensed water b in the water bucket 4 is less than the flow rate of condensed water b formed by the saturated steam a, thereby forming a stable protective water ring.

[0035] The above embodiments provide a detailed introduction to the products and methods of the present invention. Specific examples are used herein to illustrate the main steps and implementation methods of the present invention. The above embodiments are only to help understand the methods and core principles of the present invention. For those skilled in the art, according to the core principles of the present invention, various conditions and parameters may be changed as needed in specific implementations. In summary, this specification should not be construed as limiting the present invention.

Claims

1. A reference water column sampling stabilization device, It is characterized in that The invention comprises a protective cover (3), a water trough (2), a water bucket (4), a steam-side condensate guide pipe (6), a connecting pipe (5), a double-layer sleeve (12), an external condensate tank (7), a spare positive pressure sampling pipe (8), a positive pressure guide pipe (10), a negative pressure guide pipe (9) and a differential pressure transmitter (11); the water trough (2) is fixedly arranged on the periphery of the water bucket (4); the protective cover (3) and the water bucket (4) and the water trough (2) are mutually embedded; one side of the protective cover (3) is fixedly connected to the steam-side condensate guide pipe (6), and the other end of the steam-side condensate guide pipe (6) is fixedly connected to the external condensate tank (7); the other side of the external condensate tank (7) is fixedly connected to the spare positive pressure sampling pipe (8), and the spare positive pressure sampling pipe (8) The other end of the water bucket (4) is connected to a positive pressure guide pipe (10), and the other end of the positive pressure guide pipe (10) is detachably connected to a differential pressure transmitter (11); the bottom of the water bucket (4) is fixedly connected to a connecting pipe (5), and the other end of the connecting pipe (5) is connected to the positive pressure guide pipe (10), the pipeline of the connecting pipe (5) close to the water bucket (4) is located in the steam drum (1), and the remaining part of the connecting pipe (5) is located outside the steam drum (1), and the connecting pipe (5) outside the steam drum (1) is sleeved with a double-layer casing (12), one end of the double-layer casing (12) is connected to the steam drum (1), and the other end of the double-layer casing (12) is connected to the negative pressure guide pipe (9), and the negative pressure guide pipe (9) is detachably connected to the differential pressure transmitter (11); The protective cover (3) is a cylindrical cover body, the upper end of which is closed and the lower end is open, and the lower end is buckled on the water trough (2) and covers the top of the water bucket (4); four ventilation holes are provided on the side wall of the protective cover (3) which is higher than the water trough (2) and the water bucket (4), and six semicircular holes are provided on the lower edge of the side of the protective cover (3) to buckle on the bottom of the water trough (2) to form a water hole; a hole is provided on the side of the protective cover (3) which is higher than the water trough (2) and lower than the four ventilation holes to insert the steam side condensate guide pipe (6); the water bucket (4) is a box structure, and the side wall of the water bucket (4) is provided with a plurality of openings so that the height of the lower edge of the opening is consistent with the height of the upper edge of the water trough (2), and a partition (13) is embedded in the water bucket (4), the upper edge of the partition (13) is at the same horizontal height as the upper edge of the water trough (2), and a small hole is provided in the middle of the partition (13).

2. The reference water column sampling stabilization device according to claim 1, Features: The lower end of the water collection trough (2) is located in the middle of the side wall of the water bucket (4).

3. The reference water column sampling stabilization device according to claim 2, Features: The steam-side condensate guide pipe (6) is provided with a through hole, and the through hole is located inside the steam drum.

4. The reference water column sampling stabilization device according to claim 1, Features: The steam-side condensate guide pipe (6) is provided with an on-off valve, which is located outside the steam drum (1) and close to the external condensation tank (7).

5. The reference water column sampling stabilization device according to claim 1, Features: The included angle between the pipe section between the switch valve on the steam-side condensate guide pipe (6) and the external condensation tank (7) and the steam-side condensate guide pipe (6) is an oblique angle, and the oblique angle is 155 to 165 degrees.

6. The reference water column sampling stabilization device according to claim 1, Features: The included angle between the switch valve on the steam-side condensate guide pipe (6) and the pipe section between the external condensate tank (7) and the side wall of the external condensate tank (7) is an oblique angle, and the oblique angle is 70 degrees.

7. The reference water column sampling stabilization device according to claim 1, Features: An on-off valve is installed at the upper part of the connection between the standby positive pressure sampling tube (8) and the connecting tube (5); an on-off valve is also provided on the connecting tube (5), and the on-off valve is located outside the steam drum (1) and on the side of the double-layer casing (12) away from the steam drum (1); and an on-off valve is provided on the negative pressure guide tube (9).

8. The reference water column sampling stabilization device according to claim 1, Features: The other end of the standby positive pressure sampling tube (8) is connected to the positive pressure flow guide tube (10) via a switch valve.

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