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Fact sheet on Renewable Energy

 

Fact sheet on the Kiln Technology and Brick Industry in Bangladesh

 

General Fact sheet :

 

 

 

The Brick Industry in Bangladesh :
  • There are over 4000 brickfields in Bangladesh

  • Total annual production is about 12 billion

  • The Industry is growing more than 5% annually

  • Production is seasonal five to six dry months per year a Informally organized

  • Low labor productivity

  • Contributes to land degradation and depletion of water resources                                                                  

 

 

 

 

 

 

 

 

Brick Kilns at Ashulia (Near Dhaka City)

Current Kiln Technology
  • Fixed chimney kiln - outdated technology a High energy usage

  • Highly polluting a direct cause of respiratory and health problems

  • The 4,000 plus fixed chimney kilns form the largest stationary source of GHG emissions in Bangladesh which is around 3.0 million tonnes of CO2 annually

 

 

 

 

 

 

 

Fixed Chimney Kiln Ashulia (Near Dhaka City)

A cleaner Technology is available in Bangladesh

 

  • Energy efficient

  • Environmentally friendly

  • Produces better and stronger bricks

 

With Positive impacts including;

 

 

  • Lowered production cost

  • Creating stability in the workforce a Improved labor productivity

  • Conservation of natural resources

  • Feature of  the New Technology

 

 

 

 

 

 

 

Brick Kilns emission at Ashulia (Near Dhaka City)

 

Feature of the New Technology :

 

 

Energy efficient:

 

  • Reduces use of fuel

  • Kiln insulated to reduce heat losses

  • Aerodynamic and controlled air flow in kiln

  • Uses waste heat for drying green bricks

 

 

Environmentally friendly

 

  • Reduces visible and invisible air pollutants

  • Reduces land degradation by using river and lower quality clay a Lowers water usage

  •  Lowers GHG emissions

  • Eliminates use of wood and biomass

 

 

 

 

 

 

 

 

Foundation work of HHK

Stronger and better quality bricks

  • Higher strength and denser bricks

  • Uniform shape, size and consistency

 

Lower production costs

  • Lower coal usage leads to lower production cost

  • Mechanization improves labor productivity and production economies

 

 

Improved Work Conditions

 

  • Mechanization improves work conditions

  • Reduces hard manual labor

 

 

 

 

 

 

 

 

Side View of nearly completed HHK

 

Year round employment

  • Stabilizes families

  • Improves living conditions

  •  Contributes to gender equity

Technical Aspects

 

  • Kiln is 160' long, 50' wide and 13' high a 18 doors and no chimney

  • Built on 4-5 acres of land

  • Total number of workers required· 88

  • Annual brick production - 15 million

 

Financial Aspect

 

  • Cost of 1 Hybrid Hoffman Kiln Tk 3.4 million

  • Total investment of scheme about Tk 37.4 million including land a Payback period 2-3 years

  •  Internal Rate of Return (IRR) around 30%

  • Cost of production per brick Tk 1.35 - 1.60

 

 

 

 

 

 

 

 

Arched tunnel of HHK

 

 

 

 

 

 

 

 

Construction of Coal Chutes of HHK

Project Fact Sheet

 

Thematic Area

 

  • Energy conservation and energy efficiency

  • Innovative technology applications

  • National and global environmental benefits

  • Technical capacity development

  • Policy and legislation

  • Financing mechanisms and private sector involvement a

  • Livelihood and health

 

 

 

Project data

 

Name : Improving Kiln Efficiency in Brick Making Industry PDF B Phase

 

  • Implementing organization: UNDP/UNOPS

  • Location: Dhaka, Bangladesh

  • GEF contribution: US $ 384000

  • UNDP Contribution: US $ 27,840

  • Stakeholder Contribution: US $ 797, 700

  • Start Date: 2005

 

Fixed Chumney Klins

The Demo of HHK

Background

 

 

Bricks form the backbone of the aggregate requirement in Bangladesh. Traditionally, brick making is a small-scale businesses mostly located in peri-urban areas. In Bangladesh, there are over 4,000 brick-making enterprises producing over 12 billion bricks annually. Annual growth rate of the construction sector in Bangladesh has ranged from 8.1% to 8.9% in the last decade and this is expected to continue into the foreseeable future.

 

Brick production, however, is one of the most environmentally damaging activities in the industrial sector. It is one of the largest sources of greenhouse gas emissions in Bangladesh estimated to be in the order of 3.0 million tonnes of CO2 annually. Outmoded, inefficient and poorly constructed kilns and the use of substandard fuels such as high sulphur coal, tires and wood energy in the kilns have all contributed to these high levels of kiln emissions. The kilns utilize a technology that is centuries old. Unless interventions that will induce change are implemented, greenhouse gas (GHG) emissions will continue to grow unabated accompanied with deteriorating air quality. Besides the air pollution, brick making industries contributes to 2 other serious environmental concerns: land degradation and deforestation.

 

Environmentally-friendly brick making technologies are available in other countries, most notably in China that combine fuel injection brick making techniques with energy efficient kilns to produce high quality, lower cost bricks. The bricks themselves can also be molded to produce "hollow" bricks that lower resource use and serve as good insulating material because of "air traps" in the perforations. The energy efficiency of the kilns and the fuel injection techniques will result in significantly reduced local and global emissions.

 

With the availability of such technologies, a GEF /UNDP project was initiated to develop a project to remove barriers to the dissemination of energy efficient technologies in brick making on an industry-wide basis. The "Hybrid Hoffmann Kiln" was chosen as a "lead" technology since it is the most efficient available; a number of other technologies are available that may serve intermediate objectives.

 

 

The scope of the PDF-B phase included promotion of energy efficient kiln technology to transform the brick production market. The transformation is manifested in the shift to energy efficient kilns in the brick manufacturing industry in Bangladesh. The main drivers of the market transformation to energy efficient kilns are the:

 

  • Demand from brick manufacturers for the mitigating technology since it will lead to significant reduction in production costs and improvement in product quality;

  • Pressure from civil society and government to reduce smokestack emissions; and

  • Benefits for consumers from lower production costs and better quality bricks.

 

Project Overview

 

The project is a technology transfer project that facilitates barrier removal towards adoption of energy efficient kilns. Key barriers that have contributed to the current state of the industry and its inability to bring about changes, particularly in the way energy is utilized in brick making operations includes:

 

  • Lack of supporting regulations, fiscal incentives and standards to encourage more energy-efficient practices and technologies. a Little or no governmental activity to assist the brick industry to undertake comprehensive programs to transform the industry and make it less polluting and more profitable.

  • Lack of knowledge and access to energy efficient technologies that can lower production costs. Comprehensive technology dissemination programs that demonstrate the potential economic benefits of energy-efficient technologies have yet to be carried out;

  • Lack of access to liquidity to finance modernization of brick making operations. Financial institutions consider small scale family type operations as high-risk due to the seasonal, itinerant nature of their operations and lack of collateral;

  • Lack of capacity in terms of technical and business skills at the enterprise level to manage the necessary changes that could result in more efficient production and less pollution;

  • Limited experience of commercial lending institutions with SMEs and in particular, brick SMEs. They lack interaction with and understanding of the brick industry.

 

The PDF-B phase is the first phase of the project, which has resulted in the development of a 5-year full-scale technical assistance project for improving kiln efficiency in brick making industries and technical support to the first demonstration Hybrid Hoffman Kiln (HHK) in Bangladesh involving private sector and financing institutions. Structurally, the HHK is built like the Hoffman but combines a number of refinements to reduce heat escape and waste heat recovery for drying green bricks into a tunnel enabling year round production. The fuel, granulated coal, is fed into the firing zone in the kiln through stoke holes on the roof. Usually about 5,000 to 6,000 units are fired at one time, in line stacks of around 1,000. The firing time for each line stack is about half an hour.

 

The full-scale project is expected to create an enabling environment to up-scaling the adoption of energy efficient Hybrid Hoffman Kilns through private financing. The project will provide the technical assistance in terms of capacity building, technology transfer, monitoring and evaluation. The scope of this project does not include financing any energy efficient kilns from GEF project fund.

 

Side View of nearly completed HHK

 

 

 

 

 

 

 

Arched tunnel of HHK

 

Technical and Financial Fact Sheet

 

Environment :

 

In aggregate starved Bangladesh, fired clay bricks form a significant portion of the materials used in the construction industry. They are the major "building-blocks" in all infrastructure, building, road and highway projects. As such, the environmental impacts from brick manufacturing in Bangladesh are significant:

 

  • Brick making is considered to be the largest contributor to GHGs emissions in Bangladesh in the order of 3.0 million tones of CO2 emissions annually;

 

  • Brick making significantly contributes to local air pollution including emission of harmful gases such as Sulphur Oxides (SOx), Nitrogen Oxides (NOx), Carbon Monoxide (CO) and Suspended Particulate Matter (SPM) and PM10; and

 

  • The mining of clay degrades the productivity of valuable agricultural lands. Total farmland in Bangladesh is about 14 million hectares that is being depleted by about 80,000 hectares every year, a 0.05 percent depletion rate;

 

  • The illegal use of wood as fuel for brick making activities contributes to deforestation.

Demo HHK

Construction process

The environmental impacts will only exacerbate itself as urban populations expand and create a growing demand for bricks. The cumulative emissions effect is responsible for the increasing smog most noticeable around urban centers of Bangladesh including Dhaka City, which is adversely affecting the health of the adjacent urban population.

Energy

 

There are over 4,000 energy inefficient kilns in Bangladesh, each kiln consuming an average of 240 tons of coal to produce one million bricks. Almost all the coal being used is a low-grade coal imported from the Indian State of Meghalaya. This type of coal has a calorific value of 4,000 kcal/kg producing 25.8 tonnes of carbon, which is equivalent to 94.4 tonnes of CO2 per T J (IPCC default value for bituminous coal). Each kiln therefore produces 760 tonnes of CO2 per year. Total annual C02 emissions from the 4,000 kilns is, therefore, over 3.0 million tonnes.

 

Derivation of the CO2 emissions per kiln is shown on the following table.

 

  

CO2 emissions calculation per FCK

 

Caloric value of  coal

4000 kcal/kg

Coal consumption per 100000 bricks

20 to 24 Tonnes

Brick weight

3.5 kg

Specific for fuel consumption  

4.0E – 6TJ/brick

Carbon emission factor for fuel

25.4 tC/TJ

Carbon to CO2 conservation factor

3.66

Energy Efficient and Environmentally-Friendly Technology

 

A Hybrid Hoffman Kiln (HHK) is available in Bangladesh as an alternative to improving energy efficiency in the brick making. It has the following advantages:

 

  • Highly energy efficient: HHK technology uses 10 to 12 tonnes of coal with an energy savings of 50% when compared to the old technologies;

  • Compact Kiln: one HHK replaces 7.5 old kilns and only requires 25 to

  • 30% of the land required for one old kiln;

  • Operation: Easy to operate with low maintenance;

  • Construction costs: Slightly higher than old kilns;

  • Weather Proof: HHKs can be operated year-round. Unlike the old kilns in use, the HHK have roofs, which affords protection from rain especially during the monsoon. The old kilns can only operated for 5 to 6 months annually;

  • Suitable for internal fuel bricks: HHKs are highly suitable for use where fuel is added internally into the brick. In several parts of the country, agriculture residue like rice husk or fuels like coal dust can be mixed with clay before moulding. The HHK in Bangladesh will use pulverized coal to be mixed with the clays prior to baking in the kiln. This allows the use of lower-grade fuel, reduces production costs, and almost eliminates air pollution from kiln operations.

  • Modularity in construction and flexibility in production are important attributes of the technologies

  • Economic viability: Although the initial capital costs required to construct either of the kilns are greater than the traditional kilns, the operating profitability of the kilns are significantly greater due to increased production rates and lower energy usage;

  • Aesthetics and Structural strength of bricks: The bricks are uniform in size and are properly cooked. This gives the brick better aesthetics and structural strength.

 

Arch Construction

Kiln top

Key Financial Indicators

 

  • ·        Total cost of one Hybrid Hoffman Kiln is in the order of Tk 37.4 million. This includes: Cost of the actual kiln at Tk 3.4 million;

  • ·        Cost of mechanized back process at Tk 27.2 million (includes a mechanical extrusion system and dry tunnel); 1:1 An expected service life of over 20 years;

  • ·        Project finance can typically be a 35% share of promoter's equity (Tk 13.1 million) and a bank loan of 65% of fixed investment (Tk 24.3 million);

  • ·        The HHK production costs per brick ranges from Tk 1.35 to Tk 1.60 in comparison to Tk 2.10 for bricks produced with the old kilns;

  • ·        The payback period ranges from 2 to 3 years.

The following major assumptions influence the profitability of the kiln:

 

  • ·        Brick sales price: The brick price varies from year to year, district to district and even throughout the season.

  • ·        Production period: We set the production period at 12 months a year to meet the output of the plant of 15,000,000 bricks annually.

  • ·        These production costs are calculated at a price basis of 2006. Special cost factors such as metal parts and coal are subject to external price changes in a global market and should be considered accordingly.

  • ·        Labor costs are also due to changes. Future increases in salaries might be possible.

   

 

 

 

Construction Photographs of Kiln 

 

 

Foundation Work

 

 

 

 

Underground hot air exhaust replacing chimney

 

 

High accuracy construction

 

 

Precise arch work for Kiln doors

 

 Form work for main arch

 

Arched tunnel       

 

 

Aerodynamic arched tunnel

 

 

Earth finned kiln roof

waterproof kiln roof

 

Near completed HHK

 

 

 

Rammed clay insulation   

 

Archwork with coal chutes

 

 

 

Kiln near completion

 

 

 

Main arch construction   

 

 

Circular arch work closely supervised by Chinese engineer

 

 

 

 

Project Fact Sheet : Improving Kiln Efficiency in Brick Making Industries in Bangladesh(PDF) B Phase

Project Fact Sheet

Technical Fact Sheet

Brick Terminal Report April 07

(29 Mar 07) Overview of the Hybrid Hoffman Kiln

(29 Mar 07) Current Status of Brick Making Industries in Bangladesh

 

 

 

 

                                     

 

 

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Last Updated:  09 February, 2010