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Equipment and method for rapidly evaluating fire coal contamination risk

A pollution and risky technology, applied in the field of pulverized coal boiler combustion, can solve the problems of low efficiency, slow test process, unable to meet the actual needs of production and research, and achieve the effect of avoiding escape loss and simple operation

Pending Publication Date: 2022-01-21
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current means of judging the contamination of coal combustion, such as coal ash composition detection, coal ash sintering characteristics detection, etc., are either due to the slow sample preparation and testing process, the efficiency is extremely low, or the alkali / alkaline earth metal Volatile escape, resulting in unreliable staining evaluation results
In short, the current methods are difficult to achieve high-efficiency and reliable detection of coal contamination in the furnace, and cannot meet the actual needs of production and research

Method used

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  • Equipment and method for rapidly evaluating fire coal contamination risk
  • Equipment and method for rapidly evaluating fire coal contamination risk
  • Equipment and method for rapidly evaluating fire coal contamination risk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0072] combine figure 1 and figure 2 To illustrate this embodiment, a device for quickly assessing the risk of coal-burning contamination includes a combustion ash system, a coal ash burning system, and a weighing balance; wherein the combustion ash system includes a gas distribution device 1, a pulverized coal feeding Machine 2, reaction tube 3, coal ash collector 5 and air pump 6; gas distribution device 1 is provided with a gas flow meter for regulating gas flow and component distribution ratio; reaction tube 3 is placed in heating furnace 4, and its temperature passes through the heating furnace The temperature controller 8 of 4 adjusts and controls; the coal ash collector 5 has a filter element 7 that traps coal ash particles in the flue gas; the inner diameter of the reaction tube 3 is 35-50 mm, and the length of the heating section is 350-950 mm; the coal ash is burned The system includes a high-temperature heating device 9, a crucible 13, a thermocouple 12, a crucibl...

Embodiment approach 2

[0079] combine figure 1 and figure 2 To illustrate this embodiment, the internal diameter of the reaction tube 3 is 45 mm, and the length of the heated section is 600 mm; the working temperature of the crucible 13 when burning coal ash is 1000 ° C; the resolution of the weighing balance is 0.1 mg; the reaction The material of the tube 3 is nickel-chromium alloy, and the outer wall surface is frosted and coated with a 0.1mm thick nano-silicon carbide infrared absorption coating to enhance heat exchange; the pore diameter of the filter element 7 is selected as 7 μm; the material of the crucible 13 is nickel chrome. Other implementation manners are the same as the specific implementation manner 1. This embodiment coordinates and optimizes the size of each device, which is conducive to the miniaturization of the equipment; the 0.1mm thick nano-silicon carbide infrared absorption coating can greatly enhance the temperature control response characteristics of the reaction tube, a...

Embodiment approach 3

[0081] Based on attached figure 1 and figure 2 A method for quickly assessing the risk of coal-burning contamination for equipment, implemented according to the following procedures:

[0082] Step 1: Burn the coal ash sample: use oxygen-containing gas as the transport medium, transport the pulverized coal sample into the experimental device at a uniform speed for airflow carrying combustion, and generate ash particles and flue gas; the ash particles and flue gas are pumped downstream The air pump 6 flows through the filter element 7 with a temperature of 120-200°C, and the ash particles are trapped; when the estimated amount of ash particles is greater than 3g, take out the ash sample in the filter element 7; sieve the ash sample in a dry environment , Grinding, and preparing ready-to-use ash samples whose particle sizes are all less than 90 μm;

[0083] Step 2: Ash sample burning preparation: weigh and record the empty weight of the crucible in dry state 13 m 1 , put 0.8-...

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Abstract

The invention discloses equipment and a method for rapidly evaluating a fire coal contamination risk. The equipment comprises a combustion ash-making system, a coal ash firing system and a weighing balance, wherein the combustion ash-making system comprises a gas distribution device, a pulverized coal feeder, a reaction tube, a coal ash collector and a sucking pump which are connected in sequence. The gas distribution device is provided with a gas flow meter for regulating and controlling gas flow and component proportion; the temperature of the reaction tube is adjusted and controlled by a temperature controller of the heating furnace; a filter element for intercepting coal ash particles in the flue gas is arranged in the coal ash collector. According to the method, high-temperature oxygen-enriched severe combustion of pulverized coal under the condition of carrying flow is utilized to simulate a real combustion environment to prepare coal ash escaping from low-alkali / alkaline-earth metal, the coal ash is reheated and burnt in a crucible, the contamination property of coal is judged through ash sample mass loss and sintering characteristics, high-efficiency evaluation of the contamination risk of fire coal is achieved, boiler slagging contamination can be better prevented and controlled, and safe and high-proportion combustion of high-alkali coal with good economical efficiency is promoted.

Description

technical field [0001] The invention belongs to the technical field of pulverized coal boiler combustion, and mainly relates to the detection and evaluation of the safety of the coal type used by the boiler, and in particular to a device and method for quickly evaluating the pollution risk of coal combustion. Background technique [0002] High-alkali coal reserves are large, and it is widely used as fuel for power plant boilers. However, the relative content of alkali / alkaline earth metals in high-alkali coal ash is high, and the alkali / alkaline earth metals are easily gasified in high-temperature combustion, and then condensed and adhered to the heating surface and ash particles to form a fouling layer, especially the high content Na and its compounds are closely related to the formation of the fouling layer; the fouling layer greatly endangers the safety of the boiler and the economy of power generation. Prevention and control of boiler contamination is the prerequisite f...

Claims

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Application Information

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IPC IPC(8): G01N33/22G01N15/02G01N5/04F27D19/00F27B17/02
CPCG01N33/222G01N5/04G01N15/0272F27B17/02F27D19/00F27D2019/0003
Inventor 郭洋洲张喜来孙军贾子秀姚伟王桂芳刘家利张森
Owner XIAN THERMAL POWER RES INST CO LTD
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