CN201397311Y

CN201397311Y - Coal ash contamination characteristic test device

Info

Publication number: CN201397311Y
Application number: CN 200920033144
Authority: CN
Inventors: 刘家利; 薛宁; 何红光; 姚伟; 王月明; 王桂芳; 蒙毅; 杨忠灿; 相大光
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2009-05-14
Filing date: 2009-05-14
Publication date: 2010-02-03
Anticipated expiration: 2019-05-14

Abstract

The utility model provides a coal ash contamination characteristic test device, which comprises a coal feeder 1. The coal feeder 1 is communicated with a burner through an air conduit. The coal feeder1 is also communicated with an air preheater 4 through a primary air conduit 3. The air preheater is communicated with a blower 5 and a deduster 6 through air conduits. The air preheater is also communicated with a secondary air conduit 7 and a burner 2. The upper end of the burner 2 is communicated with a radiation superheater 8, a primary superheater 9, a secondary superheater 10, a tertiary superheater 11, the air preheater 4 and the deduster 6 through air conduits. A tap hole is arranged at the end of the air conduit at the lower end of the burner 2. When in work, the medium in the radiation superheater 8, the primary superheater 9, the secondary superheater 10, the tertiary superheater 11 and the air preheater 4 absorbs the energy of the flue gas after coal dust is burned. The contamination degree of the coal ash to heating surfaces can be reflected by the temperature change of the medium. Therefore, the device can judge the contamination degree of the coal simply and accurately.

Description

A kind of coal ash contamination characteristic test device

Technical field

The utility model relates to a kind of test unit, particularly a kind of coal ash contamination characteristic test device.

Background technology

Contamination in various degree all can appear in the pulverized coal firing boiler heating surface, the problem that the cleaning heating surface owing to stain to lead and will descend cause its heat-transfer capability to 30～60%, caused that steam temperature is undesired in the general stove after one hour, exhaust gas temperature increase, boiler efficiency reduction etc. influence the unit economical operation.Stain and cause when serious local flue to stop up, wearing and tearing booster (forming the flue gas corridor causes) and corrosion booster security incidents such as (NaO content height cause the alkaline metal corrosion in the ash) occur.2002, thus the winding power plant of state China then occurs causing the major accident of boiler extinguishment because of the back-end surfaces ash that collapses.In addition, the contamination of heating surface not only is related to the safety and economic operation of boiler, also is related to the long-pending ratio of radiation of burner hearth heating surface and convection heating surface and the appropriate design and the arrangement of soot blower.U.S. CE company stains degree (DIRTY) with burner hearth and determines the contamination system of heating power in calculating, the contamination degree by light be 0-100% to serious value.According to CE company experience, the contamination degree of Shenmu County's coal that the Wujing Power Plant uses is 100%, and last pot then burns test findings according to examination and elects 80% as, serious slagging scorification and contamination problem do not occur after the № of Wujing Power Plant 11, № 12 stoves put into operation.So the contamination characteristic of research coal reduces the collecting ash tendency and is one of emphasis problem that the large-sized boiler safe combustion faced always.

The contamination of heating surface not only is related to the dross of heating surface, also is related to the long-pending ratio of radiation of burner hearth heating surface and convection heating surface and the arrangement of soot blower.Therefore, the contamination performance of determining coal sample is necessary.At present, the main experimental formula that relies on is differentiated in the contamination of coal, do not designed special test unit as yet coal sample is tested in the contamination situation of boiler zones of different.

Summary of the invention

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, and a kind of test unit that the coal ash contamination characteristic is carried out actual test is provided, and has directly perceived and characteristics accurately and reliably.

In order to achieve the above object, the technical solution of the utility model is: a kind of coal ash contamination characteristic test device, comprise feeder 1, the coal spout of feeder 1 is by the primary wind and powder potpourri spout connection of airduct and burner 2, the coal spout of feeder 1 also is connected with a wind outlet of air preheater 4 by an airduct 3, the inlet of air preheater 4 respectively with the outlet of pressure fan 5, the inlet of fly-ash separator 6 is communicated with by airduct, the secondary air outlet of air preheater 4 also is connected by the overfire air port of secondary air channel 7 with burner 2, the upper end exhanst gas outlet of burner 2 by airduct successively with the gateway of radiation superheater 8, the gateway of primary superheater 9, the gateway of two-stage superheater 10, the gateway of three 11, the outlet of air preheater 4 is connected, and the airduct end of burner 2 lower ends is slag notches 12.

Because the utility model is provided with radiation superheater 8, so can simulate the radiation heating-surface in boiler screen district, because the utility model is provided with primary superheater 9, two-stage superheater 10, three 11, so can simulate the convection heating surface of boiler horizontal gas pass, coal ash then reflects by medium temperature situation of change in the heating surface the contamination situation of heating surface, so the utility model can be judged the contamination situation of coal directly perceived, easy, exactly.

Description of drawings

Accompanying drawing is an one-piece construction synoptic diagram of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

With reference to accompanying drawing, a kind of coal ash contamination characteristic test device, comprise feeder 1, the coal spout of feeder 1 is by the primary wind and powder potpourri spout connection of airduct and burner 2, the coal spout of feeder 1 also is connected with a wind outlet of air preheater 4 by an airduct 3, the inlet of air preheater 4 respectively with the outlet of pressure fan 5, the inlet of fly-ash separator 6 is communicated with by airduct, the secondary air outlet of air preheater 4 also is connected by the overfire air port of secondary air channel 7 with burner 2, the gas fume after burning radiation superheater 8 in the burner hearth of flowing through successively, primary superheater 9, two-stage superheater 10, three 11, air preheater 4, the end of burner hearth 13 lower ends is slag notches 12.The pressurized air of radiation superheater 8, primary superheater 9, two-stage superheater 10, three 11 inside is controlled separately by the valve on the female pipe of pressurized air.

Principle of work of the present utility model is: pressure fan 5 is sent into airduct 3 one time after wind is sent into air preheater 4 heating, feeder 1 is sent into burner 2 with a certain amount of coal dust by the wind in the airduct 3, coal dust is in burner hearth 13 internal combustion, pressure fan 5 is sent into burner hearth through the air that air preheater 4 is heated into uniform temperature by secondary air channel 7 with wind simultaneously, big slag behind the coal dust firing is got rid of by burner hearth 13 lower end slag notches 12, flue gas behind the coal dust firing radiation superheater 8 of flowing through, primary superheater 9, two-stage superheater 10, three 11 is after air preheater 4 arrives fly-ash separator 6 emptyings.Air dielectric in radiation superheater 8, primary superheater 9, two-stage superheater 10, three 11 and the air preheater 4 absorbs gas energy, thereby medium temperature is raise, and before not staiing coal ash, heat absorption capacity is good, and it is more that whole medium absorbs heat; After the contamination layer occurring, it is less that medium absorbs heat, and contamination is serious more, and medium absorption heat is few more in the stove; Therefore measure and stain the situation of change that heating surface interior medium in front and back absorbs heat, can reflect the contamination situation of coal ash heating surface.

Claims

1, a kind of coal ash contamination characteristic test device, comprise feeder (1), it is characterized in that, the coal spout of feeder (1) is by the primary wind and powder potpourri spout connection of airduct and burner (2), the coal spout of feeder (1) also is connected with a wind outlet of air preheater (4) by an airduct (3), the inlet of air preheater (4) is communicated with by airduct with the outlet of pressure fan (5), the inlet of fly-ash separator (6) respectively, and the secondary air outlet of air preheater (4) also is connected by the overfire air port of secondary air channel (7) with burner (2).