CN215678177U

CN215678177U - Neutron activation device for coal ash content online detection in chute

Info

Publication number: CN215678177U
Application number: CN202120419290.9U
Authority: CN
Inventors: 宋青锋; 龚亚林; 赵龙; 魏晓云; 李海柱; 黄铭鹏; 张伟
Original assignee: Dongfang Measurement & Control Technology Co ltd
Current assignee: Dongfang Measurement & Control Technology Co ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2022-01-28
Anticipated expiration: 2031-02-26

Abstract

The utility model relates to a neutron activation device for on-line detection of coal ash in a chute, which comprises a chute sampler and a sample conveying device, wherein materials are conveyed to an analyzer for analysis, the system comprises a set of crushing system, the granularity of the coal is crushed to meet the granularity requirement of the analysis of the analyzer, the crushed materials are shaped into a fixed shape through a set of material shaping device, the shaped coal enters the analyzer to carry out on-line detection of indexes such as ash content, sulfur content and the like, the analyzed materials flow into a main production system through a material abandoning device, the device solves the requirement that a coal separation plant needs to carry out rapid detection on the ash in the chute at present, and the whole device has the advantages of continuous measurement, reliable use and accurate detection result.

Description

Neutron activation device for coal ash content online detection in chute

Technical Field

The utility model relates to a device for detecting ash content in a chute in a coal preparation process link, in particular to an online ash content detection device.

Background

The ash content is an important production index in the coal separation process, and the optimization control of the coal separation production process needs to improve the recovery rate of clean coal and increase the profit of enterprises under the condition of ensuring the qualified product ash content, so that the ash content of the product coal is close to the target ash value as far as possible. In the process, the ash content of coal in each link of raw coal, clean coal, tail coal and the like needs to be measured.

The traditional ash content measuring method is characterized in that special sampling personnel collect samples of coal in each process link, the collected coal samples are prepared into analysis samples required by measurement in a sample preparation room, and then the ash content of the coal is finally obtained through weighing, firing and other links and is used for production guidance and production check.

In the production process of the coal preparation plant, the chute is a common material conveying tool, and the ash content of coal in the chute is directly related to the quality of a final product and the adjustment of production process parameters, so that the coal preparation plant can achieve the aim of controlling and optimizing production by quickly detecting the ash content of the coal in the chute. For example, in the heavy medium washing and selecting link of coal, after the heavy medium clean coal is subjected to sorting, medium removal and centrifugal dehydration, the heavy medium clean coal serving as a final clean coal product is firstly conveyed to a transfer belt entering a bin in a chute conveying mode, so that the chute is the starting end of the whole clean coal product, and the detection of ash content in the chute at the position has very high timeliness; on the other hand, after the coal at the chute position passes through links such as a mixing barrel, a cyclone, a medium removing sieve, a centrifugal machine and the like, the uniformity of the material and the representativeness of the sampling are both very guaranteed. And for other process links, such as a belt at the next stage of the chute, several clean coal products are often mixed together, and the detection of the clean coal products cannot achieve the purposes of detecting the ash content of a certain product and optimizing the production.

The online detection of the coal ash in the chute is a very practical and important requirement in the coal dressing optimization control, the online detection of the coal ash in the chute is well made, and the problems that the laboratory analysis result is lagged in the control process of the existing coal dressing process and the result is not strong in representativeness when the method is used for controlling the production process can be effectively solved.

Disclosure of Invention

The utility model aims to solve the technical problems that the coal in a chute cannot be continuously sampled manually, the ash content of a sample can be rapidly analyzed, and the detection result cannot guide the optimization control of a production process in real time.

In order to achieve the purpose, the utility model provides an on-line measuring device for ash content of coal in a chute, which comprises a chute sampling device, a sample conveying device, a crushing device, a shaping device and a set of neutron activation analysis unit, wherein the chute sampling device is arranged on the chute of a process field and can continuously or periodically collect representative coal samples to enter a material conveying device, the crushing device crushes the coal in the material conveying process, the crushed coal samples enter the material shaping device to finish shaping of the samples, the shaped materials enter the neutron activation analyzer to measure ash content of the coal samples, and the measured samples return to the process flow of the field through a material abandoning device.

The chute sampling device is directly installed on a chute pipeline on site, representative coal samples in a chute can be intercepted, and the sampling frequency and the sampling amount of the chute sampler can be adjusted according to the sample demand of the sub-analyzer.

The sample conveying device conveys collected samples to the activation analysis unit, and the sample conveying device is one or a combination of a chute, a belt and a bucket elevator according to the space condition of an installation site. The sample conveying system is designed to be closed, and materials can enter the activation analysis unit without loss. The sample conveying device is provided with a material flow alarm device in the sample transferring link of each level, and the alarm device gives an alarm when the material circulation is in a problem, so that the sampling and conveying system is timely closed, and the material blockage of the system is avoided.

The crushing device crushes the maximum particle size of a coal sample to be less than 20mm, the crushing device can be located at the front part, the middle part or the tail part of the sample conveying device according to the space condition on site, a material limiter is arranged at the front end of the crushing device, the feeding quantity entering a crushing system is controlled, the problem that the crushing system is blocked due to the fact that a large number of materials enter the crushing system in a short time is avoided, a material flow alarm device is installed at a feeding port of the crushing system, and when the crushing system is blocked, an alarm can be given in time to stop the operation of upstream equipment.

The material shaping device is positioned in front of the neutron activation analyzer and shapes the crushed material into an analysis sample with a rectangular cross section and a fixed thickness, and the shaping device can control the thickness of the material entering the analyzer by adjusting the height of the limiting plate.

The neutron activation analyzer comprises a material shaping device, a neutron activation analyzer and an observation channel, wherein the material shaping device is arranged in the neutron activation analyzer, the observation channel is arranged between the material shaping device and the neutron activation analyzer, the width of the observation channel is the same as that of the shaping device, and the state and the motion condition of a material can be observed through the observation channel.

The neutron activation analyzer can detect ash content of materials in the measuring channel in real time, and the width of the neutron activation channel is the same as the width of the material shaping device channel and the width of the observing channel.

The utility model has the advantages that the ash content in the chute can be continuously detected on line, the collection and pretreatment of samples can be automatically completed, no human factor participates in the whole analysis process, and the method has the characteristics of safety, reliability, accuracy and high efficiency, can effectively solve the influence of the particle size, thickness and distribution change of field materials on the detection result, solves the problems of high labor intensity, long process flow, potential safety hazard and poor result representativeness of the traditional manual mode on ash detection workers in the chute, is suitable for being applied to occasions with higher requirements on timeliness, representativeness and accuracy of the ash detection result in the coal dressing process control process, and can also be applied to occasions with the ash result participating in the automatic coal dressing control.

Drawings

FIG. 1 is a schematic structural diagram of a neutron activation device for on-line detection of coal ash in a chute provided by an embodiment of the utility model;

in the figure: 1. the device comprises an activation analyzer, 2 an observation channel, 3 a sample shaping device, 4 a crushing device, 5 a sample conveying belt, 6 a sample conveying chute, 7 a chute sampler, 8 a production chute and 9 a waste chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; there may be communication between the interiors of the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, an embodiment of the present invention provides a neutron activation device for online detection of coal ash in a chute, which includes a chute sampler (7), a sample conveying chute (6), a sample conveying belt (5), a crushing device (4), a sample shaping device (3), an observation channel (2), a neutron activation analyzer (1), and a waste chute (9), wherein the chute sampler (7) is installed on a chute of an on-site production process, and can continuously or periodically collect coal samples in the production chute, and the amount of collected samples can be controlled by adjusting a sampling period. The chute sampler (7) is connected with the sample conveying chute (6). Coal samples collected by a chute sampler (7) fall onto a conveying belt (5) through a sample conveying chute (6), the samples fall into a crushing device (4) through the sample conveying belt (5), the crushed coal samples enter a sample shaping device (3), the shaped materials enter an activation analyzer (1) through an observation channel (2), the activation analyzer measures the ash content of the materials in real time, and the analyzed materials return to the field production process through a waste chute (9).

Further, install the putty switch in sample transport chute (6), breaker (4), abandon material chute (9), when the putty switch takes place to report to the police, equipment before the putty position in time closes, prevents that the putty aggravates or damages equipment.

Furthermore, the middle part of the sample conveying belt (5) is provided with a material limiting device, and when the belt drives materials to move forwards, the material limiting device controls the throughput of the materials in unit time, so that the blockage of the crushing device caused by the fact that a large amount of materials fall into the crushing device in a short time is avoided. In the embodiment, a speed measuring sensor is arranged on a driven wheel of the sample conveying belt (5), and when the belt conveyor has faults of material blockage, slipping and the like, an alarm signal can be given in time.

Further, the material enters a crushing device (4) through a sample conveying belt (5), and the crushing device crushes the maximum particle size of the material to be below 20mm so as to ensure that the measuring structure is not influenced by the change of the particle size distribution.

Further, the broken material gets into shaping device (3), and shaping device upper portion is the trapezoidal body, and the below is the structure of cuboid, and the material passes through shaping device after, arranges the material shape into the rectangle that height and width are fixed.

Further, the shaped materials enter the analyzer (1) through the observation channel (2), the width of the observation channel is the same as that of a discharge port of the shaping device, and the height of the observation channel is higher than that of the shaped materials. The upper surface of the observation channel is provided with an observation door capable of being opened and closed, and the continuity, granularity and other conditions of the materials can be observed through the observation door.

Furthermore, the width of the analysis channel of the analyzer (1) is the same as the width of the shaping channel, and the height of the channel is the same as the height of the shaping device. The materials are enabled to sequentially pass through the shaping device, the observation channel and the analysis channel of the analyzer through the same conveying belt.

Further, the material that the analysis appearance analysis was accomplished, at the discharge gate position, relies on gravity to fall to abandon material chute (9) naturally, falls into on-the-spot clean coal through abandoning the material chute and transports the belt.

Claims

1. A neutron activation device for on-line detection of coal ash in a chute comprises:

the chute sampling device is positioned on a conveying chute on site and is used for collecting representative coal samples;

the sample conveying device is used for conveying the sample collected by the chute sampling device to the analyzer;

the sample crushing device is used for crushing the collected sample and eliminating the influence of the particle size change of the material on the measurement result;

the shaping device is used for shaping the crushed material into a fixed measurement shape and eliminating the influence of the material shape on a measurement result;

the neutron activation coal quality analyzer adopts an instantaneous gamma neutron activation analysis technology and is used for carrying out online detection on ash content of coal;

and the analyzed material returns to the production process through the material abandoning device.

2. The neutron activation device for the on-line detection of the ash content in the coal in the chute according to claim 1, characterized in that one or more groups of chute sampling devices are adopted, and the amount of the material collected by the chute sampling devices per hour is 2000Kg-8000 Kg.

3. The neutron activation device for the on-line detection of the ash content of the coal in the chute according to claim 1, wherein all the materials collected by the chute sampling device enter the neutron activation coal analyzer for analysis, and the width of a feeding port of the analyzer is consistent with the width of a discharging port of the shaping device.

4. The neutron activation device for the on-line detection of coal ash in the chute as claimed in claim 1, wherein the sample conveying device and the material abandoning device are one or a combination of several of a belt conveyor, a bucket elevator, a screw feeder and a chute.

5. The neutron activation device for the on-line detection of the ash content in the coal in the chute according to claim 1, wherein the crusher is any one of a hammer crusher, a roll crusher and a jaw crusher, the crusher is positioned at any one of the head part, the tail part or the middle position of the conveying device, and the maximum grain size of the discharged material of the crusher is less than or equal to 20 mm.

6. The neutron activation device for on-line detection of coal ash in the chute as claimed in claim 1, wherein the material shaping device shapes the cross section of the material entering the analyzer into a rectangular shape, the height direction of the material shaping device can be adjusted, and the height of the cross section of the material can be adjusted according to the detection requirement of the neutron activation analyzer.

7. The neutron activation device for the on-line detection of the ash content of coal in the chute according to claim 1, wherein a section of observation channel is arranged between the neutron activation coal quality analyzer and the shaping device, an upper cover of the observation channel can be opened, the circulation condition and the particle size condition of the material can be checked through the observation channel, the width of the observation channel is consistent with that of the shaping device, and the observation channel is made of high-density polyethylene material.