Device for measuring tar liquid level in tar and ammonia water separation tank

Abstract

The utility model relates to a device for measuring the liquid level of tar in a tar and ammonia water separation tank, which comprises a protective cylinder, a pressure detection element I, a pressure detection element II and a signal transmitter, the top end of the protective cylinder is fixedly connected to the top of the tar and ammonia water separation tank, and the bottom end of the protective cylinder is arranged at the lower part of a tar conical tank; the first pressure detection element is fixedly connected to the top of the protection cylinder, the second pressure detection element is fixedly connected to the bottom of the protection cylinder, the first pressure detection element and the second pressure detection element are connected with the PLC through the signal transmitter and connected with the signal transmitter through the silicone oil guide pipe, and the silicone oil guide pipe is arranged in the protection cylinder. The device has the advantages that the tar layer liquid level in the tar and ammonia water separating tank can be accurately measured in real time. The protective cylinder is used for protecting the silicone oil conduit, the silicone oil conduit is prevented from being damaged, the pressure detection element can be fixed, the service life of the detection device is prolonged, and long-term stable operation of the measuring instrument is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of interface measurement of a coking tar ammonia water separation tank, in particular to a device for measuring the tar liquid level in a tar ammonia water separation tank. Background Art

[0002] The tar-ammonia separation tank is an important equipment for separating tar and ammonia in the coke oven gas purification. The mixture of tar and ammonia from the coke oven gas collecting pipe enters the mechanized scraping tank to remove the tar residue larger than 3mm. The tar-ammonia mixture from the mechanized scraping tank enters the tar-ammonia separation tank for static separation using the density difference between ammonia and tar.

[0003] The tar-ammonia separation tank adopts a vertical structure, which consists of three parts: the upper tar-ammonia separation tank, the lower tar conical tank and the circulating ammonia tank on the outer layer of the tar conical tank. The ammonia separated from the upper part of the tar-ammonia separation tank flows through the full flow pipe through the liquid level regulator to the circulating ammonia tank at the lower part, and is then pumped out by the circulating ammonia pump and sent to the coke oven gas collecting pipe for spraying and cooling the raw coal gas. The tar separated from the tar-ammonia separation tank flows into the bottom of the inner conical tank, and is continuously pumped out from the lower pointed bottom by the tar intermediate pump and sent to the tar super centrifuge for further dehydration and slag removal. Since the tar-ammonia separation tank is a closed structure, the interface between tar and ammonia cannot be observed intuitively. At present, the tar level in the tar-ammonia separation tank is regularly measured by a cable based on the principle of potential difference, and the tar level cannot be accurately monitored in real time. Since the tar-ammonia water medium is extremely complex and highly corrosive, the cable insulation layer is frequently damaged and the damage cycle is extremely short. It often needs to be replaced, and the tar layer level measurement has always been a problem.

[0004] In the prior art, patent application number: CN201921952677.X discloses a device with tar-ammonia separation tank tar level control, which monitors the different temperatures of the upper ammonia and the middle tar to identify the position of the middle tar and obtain the approximate position of the interface. However, this device cannot obtain a more accurate tar layer level position. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a device for measuring the tar level in a tar-ammonia-water separation tank, so as to achieve accurate measurement of the tar layer level in the tar-ammonia-water separation tank, and the measuring instrument can operate stably for a long time.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A device for measuring the tar liquid level in a tar-ammonia separation tank comprises a protective tube, a first pressure detection element, a second pressure detection element and a signal transmitter. The top of the protective tube is fixedly connected to the top of the tar-ammonia separation tank, the bottom of the protective tube is arranged at the lower part of the tar conical tank, the first pressure detection element is fixedly connected to the top of the protective tube, the second pressure detection element is fixedly connected to the bottom of the protective tube, the first pressure detection element and the second pressure detection element are connected to a PLC controller via the signal transmitter, the first pressure detection element and the second pressure detection element are connected to the signal transmitter via a silicone oil conduit, and a silicone oil conduit is arranged in the protective tube.

[0008] The protection tube is vertically installed in the tar-ammonia separation tank.

[0009] It also includes flange 1 and flange 2. The bottom of the protection tube is fixedly connected with flange 1, the pressure detection element 2 is fixedly connected with flange 2, and flange 1 and flange 2 are fixedly connected by bolts.

[0010] The protective tube is a straight tube structure.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The device for measuring the tar level in the tar-ammonia-water separation tank is respectively equipped with pressure detection elements at the top of the tar-ammonia-water separation tank and the bottom of the tar conical tank. The pressure value detected by the pressure detection element is used to calculate the height of the tar layer, that is, the tar level value in the tar-ammonia-water separation tank is obtained, which can accurately and real-time measure the tar layer level in the tar-ammonia-water separation tank.

[0013] 2. The silicone oil conduit connecting the pressure detection element and the signal transmitter of the utility model is arranged in a protective tube. The protective tube is used to protect the silicone oil conduit to avoid damage to the silicone oil conduit. At the same time, the pressure detection element can be fixed, the service life of the detection device is increased, and the measuring instrument can be ensured to operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic diagram of the connection between the pressure detection element 2 and the protective tube.

[0016] Figure 3 It is an electrical schematic.

[0017] In the figure: 1-tar ammonia water inlet 2-ammonia water outlet 3-circulating ammonia water tank 4-ammonia water layer 5-full flow pipe 6-liquid level regulator 7-pressure detection element one 8-protection tube 9-signal transmitter 10-silicon oil conduit 11-pressure detection element two 12-tar layer 13-tank top space 14-tar discharge outlet 15-flange one 16-flange two. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0019] See Figure 1-Figure 3 , a device for measuring the tar liquid level in a tar-ammonia separation tank, comprising a protective tube 8, a pressure detection element 1 7, a pressure detection element 2 11, and a signal transmitter 9. The top of the protective tube 8 is fixedly connected to the top of the tar-ammonia separation tank, and the bottom of the protective tube 8 is arranged at the lower part of the tar conical tank. The pressure detection element 1 7 is fixedly connected to the top of the protective tube 8, and the pressure detection element 2 11 is fixedly connected to the bottom of the protective tube 8. The pressure detection element 1 7 and the pressure detection element 2 11 are connected to the PLC controller (the core component of the PLC control system) through the signal transmitter 9. The pressure detection element 1 7, the pressure detection element 2 11 and the signal transmitter 9 are connected through a silicone oil conduit 10. The silicone oil conduit 10 connected to the pressure detection element 1 7 is arranged in the protective tube 8. The silicone oil conduit 10 is filled with silicone oil. The pressure detection element 1 7, the pressure detection element 2 11, and the signal transmitter 9 are EJA118 double flange differential pressure transmitters.

[0020] The protective tube 8 is vertically installed in the tar-ammonia separation tank. The protective tube 8 is a straight tube structure and can be made of a stainless steel tube. The protective tube 8 is used to support and fix the pressure detection element 7. There is no need for the silicone oil conduit to bear the weight of the pressure detection element 7, so as to avoid damaging the pressure detection element 7, extend its service life, and ensure the accuracy of pressure detection.

[0021] The device for measuring the tar level in the tar-ammonia separation tank also includes flange 15 and flange 2 16. The bottom of the protective tube 8 is fixedly connected with flange 15. The pressure detection element 2 11 is fixedly connected with flange 2 16. Flange 15 and flange 2 16 are fixedly connected by bolts. Figure 2 Flange 216 can use a different diameter threaded flange.

[0022] Pressure detection element 1 7 and pressure detection element 2 11 are connected to signal transmitter 9. The output end of signal transmitter 9 is connected to the analog input module of PLC control system to output 4-20mA signal to PLC control system. The communication module of PLC control system is connected to HMI human-machine interaction screen to display parameters such as pressure value and calculated value, so as to facilitate production adjustment.

[0023] See Figure 1, the tar-ammonia mixture enters the ammonia separation tank, and the ammonia and tar are separated due to different densities. The ammonia enters the circulating ammonia tank 3 through the full flow pipe 5. The total height of the liquid level in the tar-ammonia separation tank is basically stable, and the total height = H + m, H is the distance from the ammonia liquid surface to the bottom of the protective cylinder 8, and m is the distance from the bottom of the protective cylinder 8 to the tar-ammonia separation tank. The density of ammonia is ρ1, and the height of the ammonia layer 4 = Hh, where h is the distance from the tar-ammonia interface to the bottom of the protective cylinder 8. As the height of the tar layer 12 (h + m) changes, the tar density is ρ2.

[0024] The pressure value detected by the pressure detection element 1 7 is P1, and the pressure value detected by the pressure detection element 2 11 is P2, and the pressure difference between the two is P=P1-P2.

[0025] The calculation formula of P is: P=h×ρ2+(Hh)×ρ1, among which, h=(PH×ρ1) / (ρ2-ρ1), H, ρ1, ρ2 are all constants, h and P are in a linear relationship, when the liquid level of the tar layer 12 changes, P1 and P1 change slightly and are detected by the pressure detection element 17 and the pressure detection element 2 11, h is the height of the tar layer 12 changes, m is a fixed height, according to the above calculation method, the height of the tar layer 12 (h+m) can be obtained, that is, the tar liquid level value is obtained.

[0026] A device for measuring the tar level in the tar-ammonia separation tank is installed on site, and the pressure values ​​detected by the pressure detection element 1 7 and the pressure detection element 2 11 are used. The density of ammonia water and tar is known, and the height of the tar layer 12 is calculated:

[0027] 1. Normally, the total height of the liquid level in the tar-ammonia separation tank = H + m = 8600 mm, where H = 4600 mm, m = 4000 mm. h fluctuates normally within the range of 0-2000 mm.

[0028] 2. The density of ammonia water is 1.01 g / cm³, and the density of tar is 1.18 g / cm³.

[0029] 3. The pressure of the top space 13 of the tar-ammonia separation tank is 0-500Pa (the pressure here is the detection value of the pressure detection element 11), and the length of the protection tube 8 is 6289mm.

[0030] 4. When the pressure P=4986Pa, h=(PH*ρ1) / (ρ2-ρ1)=(4986-4600*1.01) / (1.18-1.01)=2000mm.

[0031] The utility model installs pressure detection elements on the top of the tar-ammonia-water separation tank and the bottom of the tar conical tank respectively, and calculates the height value of the tar layer 12 using the pressure value detected by the pressure detection element, that is, the tar liquid level value in the tar-ammonia-water separation tank is obtained, so that the liquid level of the tar layer 12 in the tar-ammonia-water separation tank can be accurately and real-time measured.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Through the above specific implementations, those skilled in the art can easily implement the utility model. However, it should be understood that the utility model is not limited to the above specific implementations. On the basis of the disclosed implementations, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions.

Claims

1. A device for measuring the tar level in a tar-ammonia separation tank, characterized in that: It includes a protection tube, a pressure detection element 1, a pressure detection element 2, and a signal transmitter. The top of the protection tube is fixedly connected to the top of the tar-ammonia separation tank, the bottom of the protection tube is arranged at the lower part of the tar conical tank, the pressure detection element 1 is fixedly connected to the top of the protection tube, the pressure detection element 2 is fixedly connected to the bottom of the protection tube, the pressure detection element 1 and the pressure detection element 2 are connected to the PLC controller via the signal transmitter, the pressure detection element 1 and the pressure detection element 2 are connected to the signal transmitter via a silicone oil conduit, and a silicone oil conduit is arranged in the protection tube.

2. A device for measuring the tar level in a tar-ammonia separation tank according to claim 1, characterized in that: The protection tube is vertically installed in the tar-ammonia separation tank.

3. The device for measuring the tar level in a tar-ammonia separation tank according to claim 1, characterized in that: It also includes flange 1 and flange 2. The bottom of the protection tube is fixedly connected with flange 1, the pressure detection element 2 is fixedly connected with flange 2, and flange 1 and flange 2 are fixedly connected by bolts.

4. The device for measuring the tar level in a tar-ammonia separation tank according to claim 1, characterized in that: The protection tube is a straight tube structure.

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