A liquid level measuring device, a deslagging tank, a deslagging system and a pulverized coal gasification system

Abstract

The utility model discloses a kind of liquid level measuring device, deslag tank, deslag system and pulverized coal gasification system, it is related to measuring device technical field, comprising: pressure tapping pipe, liquid level meter and backflushing pipe;The first connecting port of pressure tapping pipe is used to be connected with the first pressure tapping of lower portion of the container to be measured, the positive end of liquid level meter is connected with the second connecting port of pressure tapping pipe second end, the negative end of liquid level meter is used to be connected with the second pressure tapping of upper portion of the container to be measured, the outlet of backflushing pipe is connected with the flushing port of pressure tapping pipe, flushing port is between first connecting port and second connecting port, backflushing pipe can provide impact medium to pressure tapping pipe inside by flushing port, to backflush the residue that is accumulated in first pressure tapping back into the container to be measured, avoid the problem that residue is blocked in first pressure tapping to cause the positive end of liquid level meter and the container to be measured connection not unobstructed, guarantee the accuracy of the pressure measured by first pressure tapping, and then improve the accuracy of the liquid level height data measured.

Description

Technical Field

[0001] This utility model relates to the field of measuring device technology, and in particular to a liquid level measuring device, a slag discharge tank, a slag discharge system, and a pulverized coal gasification system. Background Technology

[0002] In many industrial sectors such as metallurgy, chemical engineering, environmental protection, and energy (e.g., coal gasification), there is a widespread need for accurate measurement of liquid levels in various storage tanks, reactors, or separation tanks. Accurate liquid level measurement is crucial for process control, safe production, material balance calculations, and equipment protection. Differential pressure level gauges, due to their mature technology, simple structure, high reliability, and applicability to various operating conditions and pressure ranges, have become one of the most widely used liquid level measurement instruments.

[0003] However, this traditional measurement method has a significant and long-standing technical flaw when measuring liquid levels in media containing solid particles, easily precipitated substances, or easily crystallizing materials. For example, in coal gasification plants, liquid slag tanks, black water tanks, or similar containers containing mixtures of liquid and slag, solid slag in the medium will concentrate at the bottom of the container due to gravity. The precipitated slag will gradually accumulate at the pressure inlet, even clogging it. This prevents the high-pressure side of the differential pressure transmitter from accurately sensing the true liquid column pressure inside the tank, leading to inaccurate measurements and ultimately displaying a fixed, erroneous "false liquid level."

[0004] Therefore, there is an urgent need for a liquid level measuring device that can accurately measure the liquid level in a container. Utility Model Content

[0005] The purpose of this invention is to provide a liquid level measuring device, a slag discharge tank, a slag discharge system, and a pulverized coal gasification system to solve the problems existing in the prior art. By connecting a backflushing pipe in the middle of the pressure tapping pipe, the backflushing medium provided by the backflushing pipe can be used to flush away the accumulated slag, thus ensuring the accuracy of the measured liquid level value.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a liquid level measuring device, comprising: A pressure tapping tube, wherein the first connection port at the first end of the pressure tapping tube is used to connect to the first pressure tapping port at the bottom of the container to be tested; The liquid level gauge has its positive end connected to the second connection port at the second end of the pressure tapping tube, and its negative end connected to the second pressure tapping port at the top of the container to be measured. The system includes a backflush tube, the outlet of which is connected to the flushing port of the pressure tapping tube. The flushing port is located between the first connection port and the second connection port. The backflush tube can provide impact medium to the pressure tapping tube through the flushing port.

[0007] As one embodiment, the first connection port is used to connect to the discharge pipe of the container to be tested, and the first connection port is provided with a first shut-off valve.

[0008] As one embodiment, a booster pump is provided upstream of the backflush pipe, and the inlet of the backflush pipe is used to connect to a water source.

[0009] As one embodiment, the level gauge is a double-flange capillary level gauge, an electronic remote level gauge, or a hydrostatic double-flange level gauge.

[0010] This utility model also provides a slag discharge tank, comprising: The tank body has an inlet for connecting to a slag pool and an outlet for connecting to a slag dewatering tank. A first pressure tap is provided at the bottom of the tank body, and a second pressure tap is provided at the top of the tank body. The liquid level measuring device described above has the first connection port connected to the first pressure tapping port, and the negative terminal connected to the second pressure tapping port.

[0011] As one embodiment, the discharge port of the tank is located at the bottom of the tank, the discharge port is equipped with a discharge pipe, and a connecting pipe is connected to the upper side of the discharge pipe. The opening of the connecting pipe away from the discharge pipe is the first pressure tapping port. A second shut-off valve is provided on the discharge pipe, and the second shut-off valve is located downstream of the connecting pipe.

[0012] As one embodiment, the liquid level measuring device is provided in two sets, and the two sets of liquid level measuring devices are respectively installed on two radially opposite sides of the tank.

[0013] This utility model also provides a slag discharge system, including: A slag pool, wherein the slag pool is used to contain furnace slag; The aforementioned slag discharge tank is connected to the discharge port of the slag pool; And a slag dewatering tank, the inlet of which is connected to the slag discharge tank.

[0014] As one embodiment, the above-mentioned liquid level measuring device is installed on the slag pool and / or the slag dewatering tank.

[0015] This utility model also provides a pulverized coal gasification system, including: a process water buffer tank and the above-mentioned slag discharge system, wherein the backflushing pipe is connected to the process water buffer tank.

[0016] The present invention achieves the following technical advantages over the prior art: In the liquid level measuring device disclosed in this utility model, the outlet of the backflush pipe is connected to the first pressure tap through the flushing port of the pressure tapping pipe. The backflush pipe can backflush the first pressure tap. During the backflush process, the medium output by the backflush pipe can backflush the slag accumulated in the first pressure tap back into the container to be measured, avoiding the problem of slag clogging the first pressure tap and causing poor connection between the positive end of the liquid level gauge and the container to be measured. This ensures the accuracy of the pressure measured by the first pressure tap and thus improves the accuracy of the measured liquid level height data. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the liquid level measuring device in an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of position A; Figure 3 This is a schematic diagram of the slag discharge system in an embodiment of this utility model.

[0019] The components are: 1. Pressure tapping pipe; 2. Container to be tested; 3. Positive end; 4. Negative end; 5. Backflush pipe; 6. First shut-off valve; 7. Tank body; 8. Slag pool; 9. Slag collection tank; 10. Discharge pipe; 11. Connecting pipe; 12. Level gauge. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] The purpose of this invention is to provide a liquid level measuring device, a slag discharge tank, a slag discharge system, and a pulverized coal gasification system to solve the problems existing in the prior art. The backflush pipe can ensure good communication between the positive end of the liquid level gauge and the pressure tap, thus ensuring the accuracy of the data measured by the liquid level gauge.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 Please refer to Figure 1 - Figure 3 This embodiment provides a liquid level measuring device, including: a pressure tapping tube 1, a liquid level gauge 12, and a backflushing tube 5; wherein, the opening at the first end of the pressure tapping tube 1 is a first connection port, and the opening at the second end of the pressure tapping tube 1 is a second connection port. The first connection port is used to connect to the first pressure tapping port at the bottom of the container to be measured 2. The positive end 3 of the liquid level gauge 12 is connected to the second connection port, and the negative end 4 of the liquid level gauge 12 is used to connect to the second pressure tapping port at the top of the container to be measured 2. A flushing port is provided on the side wall of the pressure tapping tube 1 between the first pressure tapping port and the second pressure tapping port. The outlet of the backflushing tube 5 is connected to the flushing port of the pressure tapping tube 1, and the backflushing tube 5 can provide an impact medium into the pressure tapping tube 1 through the flushing port.

[0024] In use, the positive end 3 of the level gauge 12 can measure the pressure at the bottom of the container 2 under test through the first pressure tap, and the negative end 4 of the level gauge 12 can measure the pressure at the top of the container 2 under test through the second pressure tap. The backflushing pipe 5 can introduce impact medium into the pressure tapping pipe 1 through the flushing port of the pressure tapping pipe 1. After entering the pressure tapping pipe 1, the impact medium flows into the container 2 under test through the first pressure tap. During this process, the impact medium can backflush the sludge accumulated in its flow path into the container 2 under test, ensuring the unobstructed flow of the first pressure tap, that is, ensuring the connection between the positive end 3 of the level gauge 12 and the container 2 under test. The smooth internal connection ensures that the pressure measured at the positive end 3 of the level gauge 12 accurately reflects the pressure at the bottom of the container 2 under test. The pressure difference between the bottom and top of the container 2 can be obtained by comparing the pressure measured at the positive end 3 and the negative end 4. The height of the liquid level in the container 2 can then be calculated using the formula H = ΔP / (ρ × g), where H is the height of the liquid level, ΔP is the pressure difference between the bottom and top of the container 2, ρ is the density of the liquid being measured, and g is the local gravitational acceleration. Depending on the liquid, the operator can adjust the value of ρ in the formula. It is understandable that the volume of the container 2 under test is large, and the influence of the medium entering the container 2 through the first pressure tap on the original liquid level and pressure is negligible.

[0025] In other words, by setting up a backflush pipe 5 to flush the first pressure tap that is prone to sludge accumulation, this application ensures the smooth connection between the positive end 3 of the level gauge 12 and the inside of the container 2 to be measured, thereby ensuring the authenticity of the pressure value measured by the positive end 3 and achieving the technical effect of accurately measuring the liquid level height inside the container 2 to be measured.

[0026] In this embodiment, the level gauge 12 is a differential pressure level gauge 12.

[0027] In this embodiment, the second pressure tap is located at the top of the container 2 to be tested or at the same pressure as the top of the container 2 to avoid the liquid level being higher than the negative end 4 of the level gauge 12, which would cause the measured value to be inaccurate. Preferably, the first pressure tap is located at the bottom of the container 2 to be tested or at the same pressure as the bottom of the container 2 to ensure that the measured range can cover the entire area of ​​liquid in the tank 7 in the vertical direction.

[0028] In this embodiment, the first connection port is used to connect to the discharge pipe 10 of the container to be tested 2. The first connection port is equipped with a first shut-off valve 6. The discharge pipe 10 of the container to be tested 2 is located at the bottom of the effective volume space of the container to be tested 2. Connecting the first connection port to the discharge pipe 10 ensures that the first connection port and the bottom of the effective volume space inside the container to be tested 2 are at the same pressure, so as to ensure that the total liquid height in the entire tank 7 can be measured by the level gauge 12.

[0029] In this embodiment, the pressure tapping tube 1 is set vertically or horizontally.

[0030] In this embodiment, a booster pump is installed upstream of the backflush pipe 5. The inlet of the backflush pipe 5 is used to connect to a water source. The booster pump can provide sufficient pressure to the water to ensure that the sludge accumulated at the first pressure tap can be flushed clean.

[0031] Of course, the backflush medium can also be a gas or other liquid medium that does not affect the physicochemical properties of the original medium in the test container 2.

[0032] In this embodiment, the level gauge 12 is a double-flange capillary level gauge 12, an electronic remote level gauge 12, or a hydrostatic double-flange level gauge 12.

[0033] In this embodiment, the positive terminal 3 and the negative terminal 4 are connected by a wire or a communication connection.

[0034] Example 2 Please refer to Figure 1 - Figure 3 This embodiment provides a slag discharge tank, including: a tank body 7 and the above-mentioned liquid level measuring device. The inlet of the tank body 7 is used to connect to the slag pool 8, and the outlet of the tank body 7 is used to connect to the slag dewatering tank. A first pressure tap is provided at the lower part of the tank body 7, and a second pressure tap is provided at the upper part of the tank body 7. A first connection port is connected to the first pressure tap, and a negative end 4 is connected to the second pressure tap, thereby enabling accurate measurement of the liquid level height in the slag discharge tank.

[0035] In this embodiment, the discharge port of the tank 7 is located at the bottom of the tank 7, and a discharge pipe 10 is installed at the discharge port. The first pressure tap is opened on the upper side of the discharge pipe 10. This arrangement can utilize the influence of gravity on the slag to reduce the accumulation of slag at the first pressure tap.

[0036] In this embodiment, a connecting pipe 11 is provided on the upper side of the discharge pipe 10. The connecting pipe 11 is connected to the discharge pipe 10, and the opening of the connecting pipe 11 away from the discharge pipe 10 is the first pressure tap. Preferably, the connecting pipe 11 is set vertically. This method provides a certain upward movement space for the accumulated slag, reduces the tightness between the accumulated slag, and ensures that the backwash water can wash the accumulated slag clean.

[0037] In this embodiment, a second shut-off valve is provided on the discharge pipe 10. The second shut-off valve is located downstream of the connecting pipe 11. Closing the second shut-off valve can reduce or prevent the backflushing medium from directly entering the downstream equipment during the backflushing process.

[0038] In this embodiment, two sets of liquid level measuring devices are provided, and the two sets of liquid level measuring devices are respectively installed on two radially opposite sides of the tank 7. This arrangement allows for simultaneous measurement of the pressure inside the tank 7 from two locations to form a comparison, thereby improving the reliability of the measured data.

[0039] In this embodiment, a slag collection tank 9 is provided between the slag pool 8 and the slag discharge tank.

[0040] Example 3 Please refer to Figure 1 - Figure 3 This embodiment provides a slag discharge system, including: a slag pool 8, the aforementioned slag discharge tank, and a slag dewatering tank. The slag pool 8 is used to contain slag, the slag discharge tank is connected to the outlet of the slag pool 8, and the inlet of the slag dewatering tank is connected to the slag discharge tank.

[0041] In this embodiment, the liquid level measuring device described above is installed on the slag pool 8 and / or slag dewatering tank. The positive end 3 of the liquid level gauge 12 in the liquid level measuring device is connected to the bottom of the slag pool 8 and / or slag dewatering tank, and the negative end 4 of the liquid level gauge 12 in the liquid level measuring device is connected to the top of the slag pool 8 and / or slag dewatering tank, thereby enabling accurate measurement of the liquid level in the slag pool 8 and / or slag dewatering tank.

[0042] Example 4 This embodiment provides a pulverized coal gasification system, including: a process water buffer tank and the above-mentioned slag discharge system. The backflushing pipe 5 is connected to the process water buffer tank. The backflushing pipe 5 adopts a local material method, directly drawing water from the process water buffer tank in the system for backflushing, which simplifies the equipment.

[0043] It is understandable that the pulverized coal gasification system also includes other existing structures that can achieve its basic functions; these are existing technologies and will not be elaborated upon here.

[0044] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid level measuring device, characterized in that, include: Pressure tapping tube (1), the first connection port at the first end of the pressure tapping tube (1) is used to connect to the first pressure tapping port at the bottom of the container to be tested (2); The liquid level gauge (12) has its positive end (3) connected to the second connection port of the second end of the pressure tapping tube (1), and its negative end (4) connected to the second pressure tapping port on the upper part of the container to be tested (2). And a backflush tube (5), the outlet of which is connected to the flushing port of the pressure tapping tube (1), the flushing port being located between the first connection port and the second connection port, the backflush tube (5) being able to provide impact medium to the pressure tapping tube (1) through the flushing port.

2. The liquid level measuring device according to claim 1, characterized in that, The first connection port is used to connect to the discharge pipe (10) of the container to be tested (2), and the first connection port is provided with a first shut-off valve (6).

3. The liquid level measuring device according to claim 1, characterized in that, A pressure pump is installed upstream of the backflush pipe (5), and the inlet of the backflush pipe (5) is used to connect to a water source.

4. The liquid level measuring device according to claim 1, characterized in that, The level gauge (12) is a double-flange capillary level gauge (12), an electronic remote level gauge (12), or a hydrostatic double-flange level gauge (12).

5. A slag discharge tank, characterized in that, include: Tank (7), the inlet of the tank (7) is used to connect with the slag pool (8), the outlet of the tank (7) is used to connect with the slag dewatering tank, the lower part of the tank (7) is provided with a first pressure tap, and the upper part of the tank (7) is provided with a second pressure tap. And the liquid level measuring device as described in any one of claims 1-4, wherein the first connection port is connected to the first pressure tapping port, and the negative end (4) is connected to the second pressure tapping port.

6. The slag discharge tank according to claim 5, characterized in that, The discharge port of the tank (7) is located at the bottom of the tank (7). The discharge port is equipped with a discharge pipe (10). A connecting pipe (11) is connected to the upper side of the discharge pipe (10). The opening of the connecting pipe (11) away from the discharge pipe (10) is the first pressure tapping port. A second shut-off valve is provided on the discharge pipe (10), and the second shut-off valve is located downstream of the connecting pipe (11).

7. The slag discharge tank according to claim 5, characterized in that, The liquid level measuring device is provided in two sets, and the two sets of liquid level measuring devices are respectively installed on the radially opposite sides of the tank (7).

8. A slag removal system, characterized in that, include: Slag pool (8), the slag pool (8) is used to contain slag; The slag discharge tank as described in any one of claims 5-7 is connected to the discharge port of the slag pool (8); And a slag dewatering tank, the inlet of which is connected to the slag discharge tank.

9. The slag discharge system according to claim 8, characterized in that, The liquid level measuring device described above is installed on the slag pool (8) and / or the slag dewatering tank.

10. A pulverized coal gasification system, characterized in that, include: The process water buffer tank and the slag discharge system as described in claim 9, wherein the backflushing pipe (5) is connected to the process water buffer tank.

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