Development and application of technology of coal combustion in the form of coal-water fuel

(CWF) in small-scale power engineering

Clusterof Energy-Efficient Technologies

Technology of coal combustion in the form of coal-water suspension (CWS) is developed together with

with Kutateladze Institute of Thermophysics SB RAS (Novosibirsk, Russia)

Description of technology

1.The technology of CWF making was developed. This technology includes coal grinding on the ball drum mill and cavitation treatment of obtained coal-water suspension, which provides fuel with the required physical and heat-engineering properties (humidity, viscosity, heat capacity, sedimentation stability); the equipment for its implementation was made. 2.The physical-mathematical model of flare-drip combustion of CWF in the vortex regime. 3.The original constructions of furnace chambers were developed on the basis of calculations by the model of CWF combustion. 4.The original efficient wear-resisting pneumatic sprayer was developed. The resource of its successful operation is more than 1000 hours.5.The cluster strategy of development of the distributed system of heat production on CWF at small industrial enterprises and in the system of housing and public utilities.

Reagent

Water

Boiler

Sprayer

Generator of cavitation

Generator of cavitation

Accumulator

Hopper

Classifier

Transporter BDM

The scheme of CWF preparation and combustion

The effect of technology application

Reduction in production cost of 1 Gcal:at conversion of boilers from heavy oil to CWF - more than twice;at conversion of boilers from fuel-bed firing to CWF - up to 35%;

improvement of ecological situation: it allows reduction in harmful emissions to the atmosphere by the factor of 1.5-3.5 (dust, nitrogen oxides, etc.) it allows the use of different coal wastes for production of coal-water fuel – sludge, cake, etc.

rapid return of investment costs:from 1 to 2.5 heating seasons (depends on the boiler power, the scheme used before, etc.)

Technology of CWF (60 % of coal) production is based on application of the ball mill and generator of cavitation with addition of plasticizer. Coal content is 55 – 65%, size of coal particles is 60 – 70 (up to120) µm.

Ball drum mill (BDM) Generator of cavitation

Combustion of CWF in the industrial boiler at the Plant of wall blocks, Matveevka village, Novosibirsk

Efficient wear-resisting pneumatic sprayer were made (operating resource of more than 1000 hours).

Pneumatic sprayer

Three pilot boiler installations with the power of 1.5; 3; 7 MW were made.

More than 3 years are in operation.

Coal, anthracite and coal sludge were combusted.

The approval of the boiler plant for reconstruction is available.

Modified boiler КЕ 10-13

Converted to joint combustion of coal and CWF made of the wastes of coal washing, boiler RN-38 with the power of 1.2 MW

In operation since 2010.

Joint combustion of CWF and coal in the furnace of RN-38 boiler.

Boiler КЕ 10-13 with the power of 7 MW is converted for CWF combustion in a municipal boiler room in the system of housing and public utilities

Operation characteristics of the furnace in the ACS system

Products of CWF combustion

CWF combustion in boiler furnace

1. RF patent No. 2346733. Generator of cavitation. 20.02.2009. 2. RF patent No. 2403095. Generator of cavitation. 10.11. 2010.

3. RF patent No. 2346756. Pneumatic spayer 20.02.2009. 4. RF patent No. 2390386. Pneumatic spayer. 27.05.2010.

5. RF patent No. 87700. Processing line for CWF production and combustion. 20.10.2009.

6. RF patent No. 88101. Installation for combustion of coal-water fuel. 27.10.2009.

7. RF patent No. 2389945. Furnace for combustion of liquid fuel. 20.05.2010. 8. RF patent No. 2389948. Installation for combustion of coal-water fuel.

20.05.2010. 9. RF patent No. 2460014. Installation for combustion of coal-water fuel. 27.08.

2012.

Patent protection of the project