Blast furnace slag flushing bottom filter tank liquid level monitoring system based on double-filter-cylinder protection structure

Abstract

The utility model provides a blast furnace slag flushing bottom filter tank liquid level monitoring system based on a double-filter-cylinder protection structure, which comprises the double-filter-cylinder protection structure consisting of a left filter cylinder and a right filter cylinder which are symmetrically arranged, and the filter cylinders are vertically arranged at far corners of a bottom filter tank; the radar liquid level meter is fixedly mounted at the top of the filter cartridge; the upper cylinder body of the filter cylinder is of a full-sealed structure, starts from the top of the bottommost filter material layer of the bottom filter tank and extends to the top of the bottom filter tank, and a steam exhaust hole is formed in the top cylinder body of the upper cylinder body in a penetrating manner; the lower cylinder body of the filter cylinder is completely embedded in the bottommost filter material layer, the height of the lower cylinder body is the same as the laying thickness of the bottommost filter material layer, the bottom of the lower cylinder body is sealed, water permeable holes are uniformly formed in the side wall of the lower cylinder body from bottom to top, and the water permeable holes are communicated with the bottom filter tank. By means of the collaborative design of the double filter cartridges and the radar liquid level meter, liquid level monitoring with high anti-interference performance, high precision and high stability is achieved, and the real water level in the filter tank is accurately fed back.

Description

TECHNICAL FIELD

[0001] The utility model relates to ironmaking blast furnace water slag treatment system field, concretely relates to a kind of blast furnace slag flushing bottom filter tank liquid level monitoring system based on double filter cartridge protection structure. BACKGROUND

[0002] In ironmaking blast furnace water slag treatment system, bottom filter tank liquid level monitoring is crucial, directly influence slag water separation efficiency and system stability.In prior art, float ball liquid level meter is susceptible to solid slag particle interference, float ball is easily buried or mechanically damaged by water slag, cannot reflect actual water level inside filter layer;Open radar liquid level meter is installed on the outside of pool wall, is susceptible to collision of crane grab therein, and measurement value is interfered by bottom slag layer thickness of pool bottom, leading to misidentification of slag thickness as liquid level when there is no water;And pressure sensor is influenced by filter layer water permeation speed, water temperature fluctuation and backwash water pressure change, leading to data distortion, and sensor precision requirement is rigorous.

[0003] The liquid level monitoring mode of the above prior art is difficult to work stably under complex working conditions (such as slag layer covering, mechanical vibration, dynamic water pressure).Therefore, we propose a kind of blast furnace slag flushing bottom filter tank liquid level monitoring system based on double filter cartridge protection structure. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of blast furnace slag flushing bottom filter tank liquid level monitoring system based on double filter cartridge protection structure to solve the above technical problems existing in prior art.

[0005] To achieve the above object, the utility model adopts the following technical scheme: a kind of blast furnace slag flushing bottom filter tank liquid level monitoring system based on double filter cartridge protection structure, characterized by comprising:

[0006] Double filter cartridge protection structure is composed of left and right two symmetrical filter cartridges, the inside of filter cartridge is hollow, and filter cartridge is vertically installed at the far corner of bottom filter tank, and each filter cartridge is divided into upper cylinder body and lower cylinder body;

[0007] Radar liquid level meter is fixedly installed at the top of filter cartridge, and is used to measure liquid level in filter cartridge;

[0008] The upper cylinder body of filter cartridge is full-sealed structure, starts from the top of the bottommost filter material layer of bottom filter tank and extends to pool top, the top cylinder body of upper cylinder body is provided with steam exhaust hole, and the steam exhaust hole is communicated with atmosphere;

[0009] The lower cylinder body of filter cartridge is completely buried in the bottommost filter material layer, and its height is same with the laying thickness of bottommost filter material layer, the bottom of lower cylinder body is sealed, and water-permeable hole is uniformly arranged on the side wall from bottom to top, and the water-permeable hole is communicated with bottom filter tank.

[0010] Further, the steam exhaust holes are provided in plurality, and the plurality of steam exhaust holes are distributed along the cylinder circumference of the upper cylinder.

[0011] Further, the water permeable hole has a diameter of 10mm, and the total water permeable capacity of the water permeable hole is greater than the designed water permeable capacity of the bottom filter layer.

[0012] Further, the bottom of the filter cylinder is connected with the bottom of the bottom filter tank through a base.

[0013] After the above technical scheme is adopted, the following beneficial effects are obtained compared with the prior art: through the cooperative design of the double filter cylinders and the radar liquid level meter, high anti-interference, high precision and strong stability of liquid level monitoring are realized, the real water level inside the filter tank is accurately fed back, and a reliable solution for liquid level monitoring under complex working conditions is provided. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0015] Fig. 1 is a connection schematic diagram of the filter cylinder 1 and the bottom filter tank 3 in the present application;

[0016] Fig. 2 is a position distribution diagram of the two filter cylinders 1 in the bottom filter tank 3 in the present application.

[0017] Marked: 1, filter cylinder; 11, upper cylinder; 111, steam exhaust hole; 12, lower cylinder; 121, water permeable hole; 13, base; 2, radar liquid level meter; 3, bottom filter tank. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0019] In view of the problems in the prior art, the present application provides a blast furnace slag flushing bottom filter tank liquid level monitoring system based on a double filter cylinder protection structure, which will be described in detail in combination with the drawings.

[0020] Referring to Figs. 1-2The technical scheme adopted in the embodiment is shown as follows: a blast furnace slag flushing bottom filter pool liquid level monitoring system based on a double-filter-cylinder protection structure, comprising a double-filter-cylinder protection structure and a radar liquid level meter 2. The double-filter-cylinder protection structure is composed of two symmetrical filter cylinders 1 on the left and right. The filter cylinders 1 are hollow inside, and each filter cylinder 1 is vertically installed at a far corner of a bottom filter pool 3. Specifically, the bottom of the filter cylinder 1 is connected to the bottom of the bottom filter pool 3 through a base 13. Each filter cylinder 1 is composed of an upper cylinder body 11 and a lower cylinder body 12. The radar liquid level meter 2 is fixedly installed at the top of the filter cylinder 1 and used for measuring the liquid level in the filter cylinder 1.

[0021] The upper cylinder body 11 of the filter cylinder 1 is a full-sealing structure. The sealing starts from the top of the bottom layer of filter material in the bottom filter pool 3 (filter layer four) and extends to the top of the pool to avoid water slag and other impurities from penetrating into the cylinder. A plurality of steam exhaust holes 111 are provided through the top cylinder body 11. The steam exhaust holes 111 are distributed along the circumference of the upper cylinder body 11. This ensures that steam in the cylinder can escape naturally when the water temperature is high. At the same time, the steam exhaust holes 111 are in communication with the atmosphere, so that the liquid levels inside and outside the cylinder can be maintained consistent under the same air pressure. The radar liquid level meter 2 is fixedly installed at the top of the upper cylinder body 11.

[0022] The lower cylinder body 12 of the filter cylinder 1 is completely buried in the bottom layer of filter material (filter layer four). The height of the lower cylinder body 12 is the same as the laying thickness of the bottom layer of filter material. The bottom of the lower cylinder body 12 is sealed and has no opening. The side wall of the cylinder body is uniformly provided with DN10mm water-permeable holes 121 from bottom to top. The water-permeable holes 121 are in communication with the bottom filter pool 3. The total water permeation capacity of the water-permeable holes 121 should be slightly greater than the designed water permeation capacity of the bottom layer of filter material. Generally, the filter material of the bottom filter pool 3 is laid in four layers from bottom to top with goose eggs of different diameters. The diameters of the goose eggs decrease from bottom to top. The thickness of the goose eggs in the bottom layer of filter material is between 21mm and 30mm, and the laying thickness is about 800mm. When the diameter of the water-permeable hole 121 is 10mm, only filtered water can pass through. If the water permeation speed is insufficient, the diameter of the lower cylinder body 12 can be appropriately expanded.

[0023] Working principle: The core of the monitoring system is based on the double-filter-cylinder protection structure and the liquid level synchronization mechanism. The filter cylinder 1 is designed to be hollow. The lower cylinder body 12 is safely buried in the bottom layer of filter material in the bottom filter pool 3. The side wall of the cylinder body is uniformly provided with water-permeable holes 121 from bottom to top. The total water permeation capacity of the water-permeable holes 121 is slightly greater than the designed water permeation capacity of the filter material layer, which ensures that the water flow resistance is lower than that of the filter material layer, avoiding liquid level feedback lag. The lower cylinder body 12 is a full-sealing structure starting from the top of the bottom layer of filter material and extending to the top of the pool. Through the collaborative blocking of multiple layers of filter material and the sealing property of the cylinder body, water slag is effectively prevented from penetrating into the cylinder. At the same time, steam exhaust holes 111 are provided in the top side wall to balance the air pressure and discharge steam.

[0024] In the slag water separation process, the water body in the bottom filter tank 3 freely enters and exits the filter cylinder 1 through the water permeable hole 121, and because the air pressure inside and outside the cylinder is consistent, the liquid level is always synchronized, and the radar liquid level meter 2 can accurately reflect the actual water level in the tank by measuring the liquid level in the cylinder, and is not disturbed by the thickness of the surface slag layer. In the backwashing stage, because the bottom of the filter cylinder 1 is sealed and only relies on the water inlet of the side water permeable hole 121, the high-speed backwashing water flow has no direct effect on the cylinder liquid level, ensuring the stability of the measurement. Even if the water level of the bottom filter tank 3 is lower than the slag layer or the filter layer thickness, the liquid level in the cylinder can still reflect the residual water quantity in the filter layer.

[0025] The system adopts a left-right symmetrical double filter cylinder 1 layout, which is respectively installed in the far corner of the bottom filter tank 3 to avoid the mechanical operation area, and through double-point liquid level data average calculation, the situation that the water level feedback speed is slow due to the slow water filtration speed of the local filter layer can be eliminated, and the overall accuracy is significantly improved. Through actual application verification, the liquid level feedback of the system is stable and reliable under complex working conditions, which ensures the accuracy of the measurement.

[0026] In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] The above description is only used to illustrate the technical scheme of the present application, not to limit it, and other modifications or equivalent replacements of the technical scheme of the present application made by those skilled in the art should be covered in the scope of the claims of the present application.

Claims

1. A blast furnace slag flushing bottom filter tank liquid level monitoring system based on a dual-filter cartridge protection structure, characterized in that, include: The dual filter cartridge protection structure consists of two symmetrically arranged filter cartridges (1) on the left and right. The filter cartridges (1) are hollow inside and are vertically installed at the far corner of the bottom filter tank (3). Each filter cartridge (1) is divided into an upper cylinder (11) and a lower cylinder (12). A radar level gauge (2) is fixedly installed on the top of the filter cartridge (1) and is used to measure the liquid level inside the filter cartridge (1). The upper cylinder (11) of the filter cylinder (1) is a fully sealed structure, starting from the top of the bottom filter material layer of the bottom filter tank (3) and extending to the top of the tank. The top cylinder of the upper cylinder (11) is provided with a steam exhaust hole (111) that is connected to the atmosphere. The lower cylinder (12) of the filter cylinder (1) is completely buried in the bottom layer of filter material, and its height is the same as the thickness of the bottom layer of filter material. The bottom of the lower cylinder (12) is sealed, and its side wall is evenly provided with water permeable holes (121) from bottom to top. The water permeable holes (121) are connected to the bottom filter tank (3).

2. The blast furnace slag flushing bottom filter level monitoring system based on a dual-filter cartridge protection structure according to claim 1, characterized in that, Multiple steam vents (111) are provided, and the multiple steam vents (111) are distributed along the circumference of the upper cylinder (11).

3. The blast furnace slag flushing bottom filter level monitoring system based on a dual-filter cartridge protection structure according to claim 1, characterized in that, The permeable hole (121) has a diameter of 10 mm, and the total water permeability of the permeable hole (121) is greater than the designed water permeability of the bottom filter layer.

4. The blast furnace slag flushing bottom filter level monitoring system based on a dual-filter cartridge protection structure according to claim 1, characterized in that, The bottom of the filter cartridge (1) is connected to the bottom of the bottom filter tank (3) via a base (13).

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