SU141968A1 - Apparatus for burning lignin in boilers - Google Patents

Description

BACKGROUND OF THE INVENTION Lignin combustion devices in steam boiler furnaces are known, which include a pipe dryer equipped with a fuel tank with a feeder, a fuel fan and front burners included in a circuit for burning lignin in a closed loop.

In contrast to the known, a device for burning lignin in the furnaces of steam boilers is proposed, in which, to stabilize the combustion and prevent flaking of the furnace, a cycotone separator is used to separate the concentrated lignin burned in the aforementioned burners from through the waste additional burner to the high temperature zone between the torches of the front burners.

The drawing shows a structural diagram of the proposed device.

At the enterprises of the hydrolysis industry, lignin is a waste product during the chemical processing of plant materials by the method of hydrolysis. Lignin should be used as FUEL. Devices for burning lignin with a moisture content of 65% and more require pre-drying.

The proposed device operates as follows. Lignin humidity of 65% and above enters the receiving bunker and then with the help of a belt conveyor into the fuel bunker /. From the fuel bunker, using a drum-scraper feeder 2, lignin enters the shaft 3 and further into the fuel fan 4. Due to the vacuum created by the fuel fan 4, through the window 5 and the gas duct b, the gas with a temperature of about 1000 ° enters mine In the shahg, lignin is dried on the outgoing parallel flow. Especially intensively, the drying process takes place in the casing of the fuel fan, due to partial crushing of the hydrolyzed small chips and part, as well as strong mixing of the lignin with flue gases.

No. 141968 -. 2 CyiuKa || pc | fS J i4 8l in the pipe on the ascending stream 7 to the cyclone. In the cyclone 8, the lignin is separated from the drying agent and moisture. Podsmybnyyyshuttan II humidity 35-40% of the cyclone is fed Dam: in ep 1 || have lv1ste with hot gases.

i Aerosol from the cyclone enters the furnace 9, through two slot burners (,, rz | ps 1nnye | from the front of the firebox P, using no-Tpy6oTrpoBtfa7 hot air)

The drying agent with entrainment of fine fractions of lignin from the cyclone is discharged into the furnace through conduit 12 through a slit burner / located on the furnace ceiling. Secondary hot air is supplied to the vent burner via conduit 14.

To combat the separation of coarse and unprepared lignin fractions, hot air is supplied to the slag funnel through two nozzles 15 at a speed of 30-40 m / src. The presence of this air jet and visor provides for the preparation and combustion of the separated lignin particles. In order to remove foreign objects that may be in the lignin (stones, pieces of metal, and other solid inclusions), a device is needed to sort the fuel before it is received in the fuel tank. The feeders are driven by adjustable electric motors. Fuel oil burners are installed for kindling the boiler.

The described device, in the form of a pilot plant made t; tested on one of the hydrolysis plants. As shown by preliminary observations, the steam test on the same boiler was increased from 3 tons / hour d-) 8 tons / hour. The firing process for humidity up to 62% is stable.

The proposal was approved by the State Scientific and Technical Conference of the Council of Ministers of the RSFSR and recommended for implementation.

Subject invention

A device for burning lignin in boilers of steam boilers, containing a pipe dryer equipped with a fuel hopper with a feeder, a fuel fan and front burners included in a circuit for burning lignin in a closed cycle, in order to stabilize the burning and prevent slagging of the furnace cyclone separator was used to separate the dried lignin burned in the aforementioned burners from the moisture of the fine suspension suspended through the secondary burner assembly and the zone of high temperatures between f Akeli front burners.

Typo on page 2 in line 2 printed below is a waste. national team should be read