Liquid level detection device of coke oven flue inspection well

Abstract

The invention relates to a liquid level detection device for a coke oven flue inspection well, which is characterized in that the top end of a stand column is vertically and fixedly connected with a top concrete foundation layer, and the bottom end of the stand column is vertically and fixedly connected with a bottom concrete foundation layer; the stand column is sequentially provided with a first liquid level switch, a second liquid level switch, a third liquid level switch and a fourth liquid level switch from top to bottom, the first liquid level switch is used for detecting the ultrahigh liquid level of the inspection well, the second liquid level switch is used for detecting the high liquid level of the inspection well, the third liquid level switch is used for detecting the low liquid level of the inspection well, and the fourth liquid level switch is used for detecting the ultralow liquid level of the inspection well. The drainage pump is connected with a drainage pipe. The pull rod type liquid level switch has the advantages that the pull rod type liquid level switch is fixed to the metal stand column through the metal fixing ring, and the problems that a flexible wire is aged and longitudinally deformed after being stretched for a long time and the liquid level switch moves when floating or drooping are solved; the included angle between the adjacent liquid level switches is alpha, so that the problem of physical collision of the adjacent liquid level switches in the vertical direction is prevented.

Description

Technical Field

[0001] The invention relates to a liquid level detection device for a coke oven flue inspection well. Background Art

[0002] Coke ovens use blast furnace gas or coke oven gas to heat coal by high-temperature dry distillation. After the gas is mixed with air and burned, a large amount of waste gas is generated. The waste gas is collected through the flues on both sides or one side of the coke oven. The collected waste gas is led to the chimney through the outdoor coke oven main flue and discharged into the atmosphere. Each coke oven has a corresponding coke oven main flue leading to the chimney. Each coke oven main flue is equipped with a flue inspection well. Figure 1 , the exhaust gas will be collected and discharged with water vapor condensed water. The water vapor condensed water generated by the flue gas in the main flue of the coke oven will flow into the bottom of the flue inspection well from the main flue of the coke oven through the flue drainage pipe. The existing flue inspection wells are inspected manually to manually remove the water in the inspection wells. Due to the lax or untimely manual inspection, the accumulated water often cannot be discharged in time, resulting in too much condensed water collected in the flue inspection wells. The liquid level rises to a certain height and exceeds the horizontal elevation of the connecting channel between the main flue of the coke oven and the flue inspection well. The water vapor condensed water generated by the flue gas in the main flue of the coke oven will not be discharged into the flue inspection well, and even the high liquid level water in the flue inspection well will flow back into the main flue of the coke oven, affecting the normal removal of the coke oven exhaust gas, and then affecting the normal working state of the coke oven, and even posing a threat to the coking production and the safety of the coke oven body. Summary of the invention

[0003] The purpose of the present invention is to provide a liquid level detection device for a coke oven flue inspection well, which does not require manual inspection or manual drainage of accumulated water, and the liquid level detection is stable and reliable.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A liquid level detection device for a coke oven flue inspection well, the inspection well comprising a top concrete foundation layer and a bottom concrete foundation layer, comprising a liquid level switch, a column, a drainage pump, and a control unit, the top end of the column is vertically fixedly connected to the top concrete foundation layer, the bottom end of the column is vertically fixedly connected to the bottom concrete foundation layer, the liquid level switch comprises liquid level switch 1 to liquid level switch 4, the column is provided with liquid level switch 1, liquid level switch 2, liquid level switch 3, and liquid level switch 4 from top to bottom, liquid level switch 1 is used to detect an ultra-high liquid level in the inspection well, liquid level switch 2 is used to detect a high liquid level in the inspection well, liquid level switch 3 is used to detect a low liquid level in the inspection well, and liquid level switch 4 is used to detect an ultra-low liquid level in the inspection well, the drainage pump is connected to a drainage pipe, and the liquid level switch and the drainage pump are connected to the control unit.

[0006] The liquid level switch comprises a fixing ring, a floating ball and a floating ball connecting rod. The fixing ring is fixedly connected to the column, one end of the floating ball connecting rod is hinged to the fixing ring, and the other end of the floating ball connecting rod is fixedly and sealedly connected to the floating ball.

[0007] The liquid level switch comprises a float ball, and the column is a metal column. The metal column is fixedly connected with a plurality of fixing rings from top to bottom, and each float ball is connected with a corresponding fixing ring.

[0008] The float is set away from the column.

[0009] The columns include column one and column two, column one and column two are parallel to each other, one side of column one is fixedly connected with liquid level switch one and liquid level switch three, the other side of column two is fixedly connected with liquid level switch two and liquid level switch four, and the range of the angle α between adjacent liquid level switches is 180°≥α≥90°.

[0010] It also includes a main circuit, which is connected to a control unit. The control unit includes a CPU module. A liquid level switch and a drainage pump are connected to the CPU module through a port.

[0011] The control unit also includes a communication module 1 and a wireless communication module. The CPU module and the communication module 1 are connected through a communication port. The communication module 1 is connected to the wireless communication module through a port. The wireless communication module is wirelessly connected to the cloud server. The cloud server saves data information to the cloud management center through communication. The cloud management center is connected to the mobile device through communication.

[0012] The main circuit includes an overheating relay, a contactor, and a circuit breaker which are connected to the drainage pump in sequence. The digital input port of the CPU module is connected in series with the normally open auxiliary contacts of the overheating relay and the normally open auxiliary contacts of the contactor respectively. The digital output port of the CPU module is connected to the relay coil, and the normally open contacts of the relay are connected to the coil of the contactor.

[0013] The control unit is PLC.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The pull-rod type liquid level switch is fixed on the metal column with a metal fixing ring. The liquid level switch is easy to fix, repair and replace. The fixing ring is firmly fixed, which avoids the aging and longitudinal deformation of the soft wire due to long-term stretching and the displacement of the liquid level switch when it floats up or droops;

[0016] 2. Column 1 and column 2 are parallel to each other. One side of column 1 is fixedly connected with liquid level switch 1 and liquid level switch 3, and the other side of column 2 is fixedly connected with liquid level switch 2 and liquid level switch 4. The range of the angle α between adjacent liquid level switches is 180°≥α≥90°, so as to prevent the problem of physical collision between adjacent liquid level switches in the vertical direction. The structure is simple and easy to implement.

[0017] 3. The metal column is fixed on the cement foundation for maintenance, and does not deform longitudinally and transversely, thus avoiding the aging problem of the soft wires standing up and down;

[0018] 4. The CPU module and the communication module 1 are connected through the communication port, and the communication module 1 is connected to the wireless communication module through the port. The operator establishes a network connection with the wireless communication module through a mobile phone or PC, and can monitor the status data information of the liquid level switch and the drainage pump at any time, receive the data information sent by the cloud management center, and control the start and stop of drainage at any time, which is simple to maintain and saves time and effort;

[0019] 5. Operators can start and stop the drainage pump through the touch screen, which is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a bird's-eye view of the flue inspection well.

[0021] Figure 2 This is a schematic diagram of the liquid level in the flue inspection well in direction A.

[0022] Figure 3 It is a schematic diagram of liquid level detection of a soft-wire fixed soft-wire type liquid level switch.

[0023] Figure 4 This is a schematic diagram of liquid level detection of a column-fixed pull-rod type liquid level switch.

[0024] Figure 5 This is a schematic diagram of liquid level detection of a column-fixed soft-wire liquid level switch.

[0025] Figure 6 It is a schematic diagram of the principle of the liquid level detection device in the coke oven flue inspection well.

[0026] In the figure: 1-drain pump 2-drain pipe 3-flue drain pipe 4-pull rod type float liquid level switch four 5-pull rod type float liquid level switch three 6-pull rod type float liquid level switch two 7-pull rod type float liquid level switch one 8-float connecting rod 9-metal fixing seat; 10-column 11-soft wire type float liquid level switch four 12-soft wire type float liquid level switch three 13-soft wire type float liquid level switch two 14-soft wire type float liquid level switch one 15-soft wire 16-metal fixing column 17-upper and lower soft wires. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0028] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0029] [Example 1]

[0030] In a coking plant, the floor of the main flue of the coke oven is 7 meters deep from the ground, and the floor of the flue inspection well is 9 meters deep from the ground. The water at the bottom of the flue inspection well is located below the elevation side of the main flue of the coke oven. The depth of the building structure for water accumulation in the flue inspection well is 2 meters. After the first renovation, the accumulated water is discharged by the flue drainage pump 1 according to the height of the accumulated water level in the flue inspection well. Figure 2 , Liquid level detection device for coke oven flue inspection well, see Figure 3 The liquid level in the flue inspection well is detected by a float liquid level switch, and the flue drainage pump 1 starts and stops drainage according to the detected liquid level. The inspection well includes a top concrete foundation layer and a bottom concrete foundation layer, including a liquid level switch, an upper and lower flexible wire 17, and a drainage pump 1. The top of the upper and lower flexible wire 17 is vertically fixedly connected to the top concrete foundation layer, and the bottom of the upper and lower flexible wire 17 is vertically fixedly connected to the bottom concrete foundation layer. The liquid level switch includes liquid level switch 1 to liquid level switch 4. The upper and lower flexible wire 17 is fixedly connected with liquid level switch 1 14, liquid level switch 2 13, and liquid level switch 1 from top to bottom. Three 12, liquid level switch four 11, liquid level switch one 14 is used to detect the ultra-high liquid level (HH) of the inspection well, liquid level switch two 13 is used to detect the high liquid level (H) of the inspection well, liquid level switch three 12 is used to detect the low liquid level (L) of the inspection well, liquid level switch four 11 is used to detect the ultra-low liquid level (LL) of the inspection well, the drainage pump 1 is connected to the drainage pipe 2; the liquid level switch adopts a soft wire float liquid level switch, the soft wire float liquid level switch liquid level switch includes a float, a silicone soft wire 15, and a fixed column, one end of the silicone soft wire 15 is connected to the soft wire, and the other end of the silicone soft wire 15 is fixedly and sealedly connected to the float.

[0031] During use, there are the following problems:

[0032] 1. When there is no water accumulation at the bottom of the flue inspection well, the four float level switches all sag due to gravity, and the magnetic switch contacts in the float are in a disconnected state; when the flue gas in the main flue of the coke oven produces condensed water that continues to increase and is introduced into the bottom of the flue inspection well, the accumulated water level collected in the flue inspection well begins to rise from the bottom plane. As the liquid level rises and reaches the ultra-low liquid level (LL), the float of the float level switch for ultra-low liquid level (LL) detection floats upward due to the rising liquid level, while the float level switch for low liquid level (L) detection is still in a normal state of gravity sag. After a period of use, it was found that: due to the aging and longitudinal deformation of the soft wire after long-term stretching, the lateral deflection is caused. The liquid level switch is connected to the vertical soft wire through a silicone soft connection, and the liquid level switch shifts when it floats or sags;

[0033] 2. When the liquid level continues to rise and exceeds the low liquid level (L) and the high liquid level (H), the three float level switches for ultra-low liquid level (LL) and low liquid level (L) and high liquid level (H) detection all float upward due to buoyancy, while the float level switch for ultra-high liquid level (HH) detection is still in a normal state and hangs down by gravity. Since the upper and lower distances between the high liquid level (H) and the ultra-high liquid level (HH) are small, the two float level switches are in opposite positions, and physical collision will occur in the vertical direction; when the water level in the flue inspection well continues to rise and exceeds the ultra-high liquid level (HH), the four float level switches all float upward;

[0034] 3. The liquid level in the flue inspection well begins to drop after drainage. As the liquid level drops to the high liquid level (H), the float liquid level switch for super-high liquid level (HH) detection sags due to gravity, while the float liquid level switch for high liquid level (H) detection still floats upward due to buoyancy; the upper and lower distances between the super-high liquid level (HH) and the high liquid level (H) are small, and the two float liquid level switches are in opposite positions, which will produce a physical collision in the vertical direction;

[0035] 4. When the liquid level in the flue inspection well continues to drop, below the high liquid level (H) and the low liquid level (L), and drops to the ultra-low liquid level (LL), the float liquid level switch for low liquid level (L) detection is in a normal state and hangs down by gravity, and the float liquid level switch for ultra-low liquid level (LL) detection floats upward due to buoyancy. Since the upper and lower distances between the low liquid level (L) liquid surface and the ultra-low liquid level (LL) liquid surface are small, the positions of the two float liquid level switches are in opposite directions, and a physical collision will occur in the vertical direction.

[0036] In view of the above problems, the coking plant made rectifications and replaced the soft wire 10 with a metal column 10. The metal column 10 is fixedly connected with multiple fixing rings from top to bottom. Each floating ball is connected to a corresponding fixing ring. The floating ball is set away from the column 10. Figure 4 .

[0037] Plan 1 is as follows:

[0038] A pull-rod liquid level switch 1 7 and a pull-rod liquid level switch 3 5 are fixedly connected to one side of the column 10, and a pull-rod liquid level switch 2 6 and a pull-rod liquid level switch 4 4 are fixedly connected to the other side of the column 10; the range of the fixed angle α of adjacent liquid level switches is: 180°≥α≥90°, that is, the ultra-high liquid level (HH) float liquid level switch and the high liquid level (H) float liquid level switch, as well as the low liquid level (L) float liquid level switch and the ultra-low liquid level (LL) float liquid level switch are respectively arranged and fixed on the column 10 with an angle α of 180°≥α≥90 in the top view; the liquid level switches all maintain the original liquid level detection function of the flue inspection well, solving the on-site Figure 3The liquid level detection method solves the problem of physical collision between adjacent liquid level switches in the vertical direction; the pull-rod float liquid level switch includes a metal fixing ring 9, a float, and a float connecting rod 8. The fixing ring 9 is fixedly connected to the column 10, one end of the float connecting rod 8 is hinged to the fixing ring 9, and the other end of the float connecting rod 8 is fixedly and sealedly connected to the float.

[0039] Working process: As the water accumulates at the bottom of the flue inspection well, the liquid level continues to rise. The float level switch stands upright due to the buoyancy as the liquid level rises, and the switch contacts in the float level switch are closed; when the water level drops, the float level switch sags downward due to gravity in the atmosphere, and the switch contacts in the float level switch change from a closed state to an open state. As the water level in the flue water collection well rises again, the float level switch stands upright again under the action of buoyancy, and the switch contacts in the float level switch will close again; the fixed horizontal elevation of the float level switch is determined by the alarm liquid level of the flue inspection well and the liquid level of the start-stop drainage pump 1.

[0040] Solution 2 is as follows:

[0041] See Figure 5 , the column includes a column 10, one side of the column 10 is fixedly connected with a soft wire liquid level switch 14 and a soft wire liquid level switch 3 13, and the other side of the column 10 is fixedly connected with a soft wire liquid level switch 2 12 and a soft wire liquid level switch 4 11; the range of the fixed angle α of adjacent liquid level switches is: 180°≥α≥90°, that is, the ultra-high liquid level (HH) float liquid level switch and the high liquid level (H) float liquid level switch, as well as the low liquid level (L) float liquid level switch and the ultra-low liquid level (LL) float liquid level switch, are respectively arranged and fixed on the column 10 with an angle α of 180°≥α≥90 in the top view; the liquid level switches all maintain the original liquid level detection function of the flue inspection well, solving the on-site Figure 3 The liquid level detection method has the problem of physical collision between adjacent liquid level switches in the vertical direction; the liquid level switch adopts a soft wire float liquid level switch, which includes a float 14, a silicone soft wire 15, and a metal fixed column 16. The metal fixed column 16 is fixedly connected to the column 10, one end of the silicone soft wire 15 is fixedly connected to the fixed column 16, and the other end of the silicone soft wire 15 is fixedly and sealedly connected to the float 14.

[0042] [Example 2]

[0043] In this embodiment, a liquid level detection device for a coke oven flue inspection well is the same as that in Embodiment 1, on the basis of which a main circuit and a PLC are added.

[0044] The PLC includes a CPU module, a communication module 1, a communication module 2, a communication module 3, a wireless communication module, and a touch screen. The CPU module, the communication module 1, the communication module 2, the communication module 3, and the touch screen are connected through a communication port. The communication module 1 is connected to the wireless communication module through a port, the communication module 2 is connected to the touch screen through a port, and the communication mode 3 is connected to the engineer station of the remote control center, so that the data of the PLC is transmitted to the remote control center for convenient centralized management. The wireless communication module is wirelessly connected to the cloud server, and the cloud server saves the data information to the cloud management center through communication. The cloud management center is connected to the mobile device through communication; the wireless communication module is any one of a 5G communication module, a 4G communication module, a Bluetooth module, a WiFi module, a GSM module, a CDMA module, a CDMA module, a WCDMA module, a TD-SCDMA module, a Zigbee module, and a LoRa module, or any combination of several of them. The operator establishes a network connection with the wireless communication module through a mobile phone or a PC to monitor the status data information of the liquid level switch and the drainage pump 1 in real time. The main circuit includes an overheating relay FR, a contactor KM, and a circuit breaker Q which are connected to the drainage pump 1 in sequence. The digital input port of the CPU module is connected in series with the normally open auxiliary contacts of the overheating relay FR and the normally open auxiliary contacts of the contactor KM, respectively. The digital output port of the CPU module is connected to the coil of the relay KA, and the normally open contact of the relay KA is connected to the coil of the contactor KM.

[0045] The pull-rod type liquid level switch of the present invention adopts a metal fixing ring to be fixed on a metal column. The liquid level switch is easy to fix, repair and replace. The fixing ring is firmly fixed, which avoids the problem of aging and longitudinal deformation of the soft wire due to long-term stretching and displacement of the liquid level switch when it floats or sags. The column 1 and the column 2 are parallel to each other. The liquid level switch 1 and the liquid level switch 3 are fixedly connected on one side of the column 1, and the liquid level switch 2 and the liquid level switch 4 are fixedly connected on the other side of the column 2. The range of the angle α of adjacent liquid level switches is 180°≥α≥90°, which prevents the problem of physical collision of adjacent liquid level switches in the vertical direction. The structure Simple and easy to implement; the metal column is fixed on the cement foundation for maintenance, and does not deform vertically and horizontally, avoiding the aging problem of the soft wires on the upper and lower parts; the CPU module and communication module 1 are connected through the communication port, and the communication module 1 is connected to the wireless communication module through the port. The operator establishes a network connection with the wireless communication module through a mobile phone or PC, and can monitor the status data information of the liquid level switch and the drainage pump at any time, receive the data information sent by the cloud management center, and control the start and stop of the drainage at any time. The maintenance is simple, saving time and effort; the operator can start and stop the drainage pump through the touch screen, which is simple and convenient to operate.

Claims

1. A liquid level detection device for a coke oven flue inspection well, the inspection well comprising a top concrete foundation layer and a bottom concrete foundation layer, characterized in that: It includes a liquid level switch, a column, a drainage pump, and a control unit. The top of the column is vertically fixedly connected to the top concrete foundation layer, and the bottom of the column is vertically fixedly connected to the bottom concrete foundation layer. The liquid level switch includes liquid level switch 1 to liquid level switch 4. The column is provided with liquid level switch 1, liquid level switch 2, liquid level switch 3, and liquid level switch 4 from top to bottom. Liquid level switch 1 is used to detect ultra-high liquid level in the inspection well, liquid level switch 2 is used to detect high liquid level in the inspection well, liquid level switch 3 is used to detect low liquid level in the inspection well, and liquid level switch 4 is used to detect ultra-low liquid level in the inspection well. The drainage pump is connected to the drainage pipe, and the liquid level switch and the drainage pump are connected to the control unit.

2. The liquid level detection device for a coke oven flue inspection well according to claim 1, characterized in that: The liquid level switch comprises a fixing seat, a float and a float connecting rod. The fixing seat is fixedly connected to the column, one end of the float connecting rod is hinged to the fixing seat, and the other end of the float connecting rod is fixedly and sealedly connected to the float.

3. The liquid level detection device for a coke oven flue inspection well according to claim 1, characterized in that: The liquid level switch comprises a float ball, and the column is a metal column. The metal column is fixedly connected with a plurality of fixing rings from top to bottom, and each float ball is connected with a corresponding fixing ring.

4. A liquid level detection device for a coke oven flue inspection well according to claim 2 or 3, characterized in that: The floating ball is arranged away from the column.

5. The liquid level detection device for a coke oven flue inspection well according to claim 1, characterized in that: The columns include column 1 and column 2, which are parallel to each other. One side of column 1 is fixedly connected with liquid level switch 1 and liquid level switch 3, and the other side of column 2 is fixedly connected with liquid level switch 2 and liquid level switch 4. The range of the angle α between adjacent liquid level switches is 180°≥α≥90°.

6. The liquid level detection device for a coke oven flue inspection well according to claim 1, characterized in that: It also includes a main circuit, which is connected to a control unit. The control unit includes a CPU module. The liquid level switch and the drainage pump are connected to the CPU module through a port.

7. The liquid level detection device for a coke oven flue inspection well according to claim 6, characterized in that: The control unit also includes a communication module 1 and a wireless communication module. The CPU module and the communication module 1 are connected through a communication port. The communication module 1 is connected to the wireless communication module through a port. The wireless communication module is wirelessly connected to a cloud server. The cloud server saves data information to a cloud management center through communication. The cloud management center is connected to a mobile device through communication.

8. The liquid level detection device for a coke oven flue inspection well according to claim 6, characterized in that: The main circuit includes an overheating relay, a contactor, and a circuit breaker connected to the drainage pump in sequence. The digital input port of the CPU module is connected in series with the normally open auxiliary contacts of the overheating relay and the normally open auxiliary contacts of the contactor respectively. The digital output port of the CPU module is connected to the relay coil, and the normally open contact of the relay is connected to the coil of the contactor.

9. The liquid level detection device for a coke oven flue inspection well according to claim 1, characterized in that: The control unit is a PLC.

Images