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OUR

TECHNOLOGY

Technology of Blue Carbon Production in SJ Low Temperature Dry Distillation Furnace

Brief introduction

SJ low temperature distillation furnace was designed and completed by China Coal Chemical Research Institute on basis of reheating vertical furnace in 1996. At present, more than 500 SJ low-temperature distillation furnaces have been designed and constructed in Yulin area of northern Shaanxi Province and Dongsheng area of Inner Mongolia. SJ-Yao low-temperature dry distillation furnaces are excellent ones for production of blue carbon at present. They have low investment, large output and good operation.

 

蘭炭的固定炭高、比電阻高、化學活性高;含灰分低、鋁低、硫低、磷低的特性,可代替冶金焦、無煙煤和木炭,在生產電石、金屬硅,鐵合金、硅鐵、鉻鐵、硅錳、碳化硅,化肥的產品中廣泛運用,比冶金焦效果好等優點。

Blue carbon has high fixed carbon, high specific resistance and high chemical activity. It has low ash content, low aluminum, low sulfur and low phosphorus. It can replace metallurgical coke, anthracite and charcoal.

 

It is widely used in the production of calcium carbide, metal silicon, ferroalloy, ferrosilicon, ferrochrome, silicomanganese, silicon carbide, and fertilizer products, and has better effects than metallurgical coke.








1. Auxiliary coal box; 2. Gas collecting umbrella; 3. Climbing ladder; 4. Flower wall; 5. Furnace body; 6. Small arch wall; 7. Coke discharging box; 8. Furnace bottom platform; 9. Pushing coke disc; 10. Scraper; 11. Water sealing box

  1. Production of blue carbon coal quality requirements:


Table 1

Note: Coking coal cannot be used, and the characteristics of cinder cannot be >4. The smaller the better.

2.

The coal quality of Shaanxi Shenmu blue coal production is as follows:

 

 Coal Mine Coal Quality Inspection Report Table 2

3. Process flow

1.2.1、 蘭炭的生產主要以方形豎爐的形式進行,其流程工藝包括:

The production of blue coal is mainly carried out in the form of square shaft furnace. Its process includes:

A、洗煤工段——原料庫房——煉焦豎爐——水洗塔——電捕焦油——煤氣風機——煤氣儲罐

A. Coal Washing Section - Raw Material Warehouse - Coking Shaft Furnace - Water Washing Tower - Electric Tar Catching - Gas Fan - Gas Storage Tank

B、煉焦豎爐——熄焦箱——推焦機——刮板機——烘干機——蘭炭成品庫房

B. Coking Shaft Furnace-Coke Quenching Box-Coke Pusher-Scraper-Dryer-Blue Carbon Product Warehouse

C、水洗塔和電捕焦油——渣池——油池——氨水池——泵房——熄焦箱和水洗塔循環

C. Washing Tower and Electric Tar Catching - Residue Pool - Oil Pool - Ammonia Pool - Pump House - Coke Quenching Box and Washing Tower Cycle

After secondary crushing of raw coal, the lump size is 20-80 mm, which is fed into the coal storage bin above the retort furnace through the coal conveyor belt. The coal miner adds the lump according to the treatment capacity of the dry distillation furnace, and the amount added is based on the principle of no loss of material on the top of the furnace. Raw coal gradually decreases in the dry distillation furnace, then passes through the drying section, the dry distillate section and the cooling section. Finally, it is pushed down to the quenching pool by a pusher. The blue carbon is sent to the dryer by a scraper machine for drying. After drying, the transdermal belt conveyor is sent to the screening machine to screen the finished products of the blue carbon.

焦爐煤氣從干餾爐頂部上升管和橋管進入煤氣集氣箱,在橋管設有噴淋口,用熱環池循環水將煤氣進行初冷,初冷后煤氣從塔頂進入文丘里塔,來自熱循環水從塔頂噴淋而下,煤氣與下降的熱循環水在文丘里管充分峰觸,大約80%的焦油被冷卻水帶入塔底,冷卻并除去大部分焦油的煤氣從文丘里塔底導出、進入旋流板塔。在旋流板塔內;來自冷水循環系統的冷循環水與煤氣逆流接觸,煤氣被繼續冷卻并除去其中所含焦油。

Coke oven gas enters the gas collecting tank from the riser and bridge pipe at the top of the dry distillation furnace. There is a sprinkler in the bridge pipe. The gas is first cooled by the circulating water of the hot ring pool. After the initial cooling, the gas enters the Venturi Tower from the top of the tower, and the hot circulating water sprays down from the top of the tower. The gas and the descending hot circulating water come into full contact in the Venturi pipe, about 80. % tar is brought to the bottom of the tower by cooling water, and the gas which cools and removes most of the tar is exported from the bottom of Venturi tower and enters the swirl plate tower. In the swirl plate column, the cold circulating water from the cold water circulating system countercurrent with the gas, and the gas is cooled continuously and the tar contained therein is removed.

 

After two-stage cooling and De-Tar treatment, the gas continues to descend, enters the electric tar trap to further remove the tar in the gas, and then enters the gas fan. Through the gas blower, part of the gas is sent to the dry distillation furnace, part to the blue carbon dryer, and the rest to the accident torch emptying, power generation or other purposes.

該工藝中各部分去除的焦油在各循環池內靜止分層后,通過焦油泵送入焦油儲罐。

The tar removed from each part of the process is statically stratified in each circulating pool and then pumped into the tar tank through the tar pump.


4. Brief introduction of each section:

1.3.1.備煤工段

4.1. Coal preparation section

備煤土段主要設施和設備:備煤場、裝載機、受煤地坑、輸送皮帶、篩煤樓、除塵設備、面煤倉、皮帶計量稱、料斗、可逆式皮帶、地磅。

Main facilities and equipment of preparation coal and soil section: equipment coal yard, loader, coal pit, conveyor belt, coal screen building, dust removal equipment, coal bunker, belt weighing, hopper, reversible belt, loadometer.

1.3.2.炭化工段:

4.2. Carbonization section:

炭化工段主要設施和設備包括:SJ-低溫干餾方爐、集氣陣傘、鋼結構爐頂蓋、輔助煤箱、上升管、橋管、煤氣水封箱、排焦箱、推焦機、刮板機、水封槽、回爐加熱設施、熄焦清水池、清水泵。

The main facilities and equipment in the carbonization section include SJ-low temperature dry distillation square furnace, gas collecting umbrella, steel structure furnace top cover, auxiliary coal box, riser, bridge pipe, gas water seal box, coke discharging box, coke pusher, scraper, water seal tank, return furnace heating facilities, coke quenching water tank and water pump.

Each single furnace is continuous production. The raw coal gradually decreases in the dry distillation furnace, and then passes through the drying section, the dry distillate section and the cooling section. After being cooled by a water-cooled jacket coke discharging box at the bottom of the furnace, the blue carbon formed by pyrolysis falls into the coke quenching pool through a coke pusher through the coke guide nozzle. The coke is quenched with clean water,

The coke-drawing disc and scraper immersed in the water seal are under the action of the transmission,the blue carbon is sent to the gas dryer for drying until the moisture content is 15-20%. The blue carbon is sent to the sieving machine by belt conveyor for sieving. The products of different grades are obtained and classified in the coke yard.

產生的焦爐煤氣通過集氣陣傘至干餾爐頂部上升管,經由橋管噴淋初步冷卻分離后進入煤氣集氣管,然后送至文丘里塔,煤氣流動動力來自流程中設置的煤氣風機的吸力。

The generated coke oven gas passes through the gas gathering umbrella to the top riser of the dry distillation furnace, is initially cooled and separated by the bridge pipe, enters the gas collecting pipe, and is sent to the Venturi Tower. The gas flow power comes from the suction of the gas fan set in the process.


The dry distillate furnace adopts internal heating type, and the temperature in the dry distillate furnace is controlled by adjusting the ratio of heating gas to air. Gas and air branches are equipped with flowmeters, pressure gauges and control valves. The air blower adopts two standby one work schemes, and the air volume of each furnace is regulated separately. The gas system is equipped with pressure, temperature and flow measurement and control instruments to monitor the gas system.

4.3. Purification Section

凈化工段主要設施和設備包括:文丘里塔、.旋流板塔、電捕焦油器、煤氣風機、空氣風機、循環水水泵:、焦油泵、清水循環池,熱循環水拖,冷循環水池、換熱器、玻璃鋼冷卻塔、焦油聚集槽,配電控制柜、儀表柜、測試壓力溫度流量儀表、循環水泵房、焦油泵房、配電儀表室。

The main facilities and equipment of the purification section include: Venturi Tower, Swirl Plate Tower, Electric Tar Collector, Gas Fan, Air Fan, Circulating Water Pump, Tar Pump, Clear Water Circulating Pool, Hot Circulating Water Tower, Cold Circulating Pool, Heat Exchanger, Glass Fiber Reinforced Plastic Cooling Tower, Tar Aggregation Pool, Distribution Control Cabinet, Instrument Cabinet, Test Pressure, Temperature flow meter, circulating water pump room, tar pump room, distribution instrument room.

4.4. Screening Coke Section

篩焦工段主要設施和設備

Main Facilities and Equipment of Coke Screening Section

皮帶機、緩沖倉、篩焦樓、振動篩、除塵器、卸焦皮帶、焦場、地磅、裝載機。

Belt conveyor, buffer bin, screen coke building, vibrating screen, dust collector, unloading belt, focal field, load meter, loader.

篩焦工段工序和特點:

Procedures and characteristics of coke screening section:

通過烘干機烘干后的蘭炭由出焦皮帶機輸送到緩沖倉。緩沖倉內可儲存3小時蘭炭生產量,緩沖倉下設置B800皮帶將蘭炭輸送到篩焦樓,篩焦樓設置振動篩,把蘭炭篩分成四種粒度等級,儲存在篩焦樓底4個儲倉,底倉設置B800出焦皮帶,分別把4個焦倉的料送到卸焦皮帶機上。卸焦皮帶機設置在焦場,高度13米,不同規格的蘭炭分別堆放,由裝載機裝車外售。全部皮帶機均設置皮帶走廊封閉運行。篩焦樓封閉運行設置除塵器。

The blue carbon dried by the dryer is conveyed to the buffer bin by the coke belt conveyor. The output of blue carbon can be stored for 3 hours in the buffer warehouse. B800 belt is installed under the buffer warehouse to convey the blue carbon to the sieve coke building. Vibrating screen is installed in the sieve coke building. The blue carbon sieve is divided into four particle sizes and stored in four warehouses at the bottom of the sieve coke building. B800 coke belt is installed at the bottom of the warehouse, and the materials of four coke warehouses are sent to the unloading belt machine respectively. The coke unloading belt conveyor is set in the coke field with a height of 13 meters. The different specifications of blue carbon are stacked separately and sold out by loaders. All belt conveyors are equipped with belt corridors for closed operation. A dust collector is installed in the closed operation of the sieve coke building.

4.5. Sewage Treatment Section

污水處理工段主要設施和設備包括:沉淀除油罐、氣浮除油槽,調節池、厭氧池、好氧池、混合吸附池、終沉池、污水泵、供熱和供水設施、配電設備

The main facilities and equipment of sewage treatment section include: sedimentation deoiling tank, air floatation deoiling tank, regulating tank, anaerobic tank, aerobic tank, mixed adsorption tank, final sedimentation tank, sewage pump, heating and water supply facilities, distribution equipment.

1.6.1、污水處理工段工序和特點

4.6. Procedures and Characteristics of Sewage Treatment Section

來自冷環池的氨水進入沉淀儲油罐,經沉淀分層后,將重油回收至焦油儲罐,氨水進入氣浮除油槽,分離出輕油后,氨水進入調節池,補充生活污水和部分清水。

Ammonia water from the cold ring tank enters the precipitation tank. After stratification, heavy oil is recovered to the tar tank. Ammonia water enters the floatation deoiling tank. After separation of light oil, ammonia water enters the regulating tank to supplement domestic sewage and clean water.

1.6.2、熱循環水系統

4.7. Thermal circulating water system

熱循環水系統主要提供文丘里塔的氨水循環。主要過程包括:來自熱循環池的循環氨水進入文丘里塔塔頂作為冷卻水,在塔內與煤氣進行熱量交換,夾帶著焦油的冷卻水從塔底流出,進入熱循環池,在熱環池內油水分離,焦油被定期打入焦油儲罐,循環水泵送入文丘里塔循環使用,當熱環池水量不足時,由冷環池內循環水泵入補充。

The thermal circulating water system mainly provides the ammonia water circulation of Venturita. The main processes include: the circulating ammonia water from the thermal circulating pool enters the top of the Venturi tower as cooling water, exchanges heat with gas in the tower, the cooling water with tar flows out from the bottom of the tower, enters the thermal circulating pool, separates oil from water in the thermal circulating pool, and the tar is regularly pumped into the tar storage tank, and the circulating water is pumped into the Venturi tower for circulation. When the hot ring pool water is insufficient, the circulating water in the cold ring pool is pumped in to supplement.

1.6.3、冷循環水系統

4.8. Cold circulating water system

在換熱器內被清水冷卻的循環水,從塔頂進入旋流板塔進行煤氣的二級冷卻,交換熱量后出塔的循環水溫度大約45-55c,從塔底排出,進入冷循環池進行油水分離,焦油送去焦油儲罐,循環水經換熱器換熱冷卻,剩余循環水一部分補充至熱循環池,一部分進入污水處理系統進行妙理,達標水補充吞熄焦池。冷循環池需定期補充清水。

The circulating water cooled by clean water in the heat exchanger enters the swirl plate tower from the top of the tower for secondary cooling of gas. After exchanging heat, the circulating water temperature of the outlet tower is about 45-55c. It discharges from the bottom of the tower and enters the cold circulating pool for oil-water separation. Tar is sent to the tar storage tank. The circulating water is cooled by heat exchanger and the remaining circulating water is one part. It is supplemented to the thermal cycle pool,other part of which enters the sewage treatment system for reasonable treatment, and the standard water is supplemented to the coke swallowing and extinguishing pool. Fresh water should be replenished regularly in the cold circulation pool.

1.6.4、換熱器清水循環系統

4.9. Clean Water Circulation System of Heat Exchanger

換熱器清水循環系統中換熱器采用列管式換熱器,主要作用是用清水冷卻冷環池循環水,操作時冷循環水走管程,清水走殼程。循環水在熱交換過程中放出熱量,溫度降低至45-50℃后進人旋流板塔進行煤氣的二級冷卻,而清水溫度也由30^40℃升高至35^45℃送至涼水塔進行冷卻后到清水循環池循環使用。

In the clear water circulation system of heat exchanger, the heat exchanger adopts tubular heat exchanger. Its main function is to cool the circulating water in the cold ring pool with clean water. The cold circulating water runs through the tube and clean water runs through the shell. The circulating water emits heat in the process of heat exchange. When the temperature drops to 45-50 C, it enters the swirl plate tower for secondary cooling of gas, and the temperature of clean water rises from 30 ^ 40 C to 35 ^ 45 C, which is sent to the cooling tower for cooling and then circulates to the circulating pool of clean water.

5. Requirements of raw materials for producing blue carbon in SJ low-temperature retort furnace:

煤的指標:

Coal indicators:

SJ low-temperature dry distillate furnace parameters for production of blue carbon products:

產品檢驗: 1-3

Product Inspection: Table 1-3




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