Fact sheet on Renewable Energy
Fact sheet on the Kiln Technology and Brick Industry in Bangladesh
General Fact sheet :
The Brick Industry 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) |
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Current Kiln Technology
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Fixed Chimney Kiln Ashulia (Near Dhaka City) |
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A cleaner Technology is available in Bangladesh
With Positive impacts including;
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Brick Kilns emission at Ashulia (Near Dhaka City)
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Feature of the New Technology :
Energy efficient:
Environmentally friendly
Eliminates use of wood and biomass |
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Foundation work of HHK |
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Stronger and better quality bricks
Lower production costs
Improved Work Conditions
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Side View of nearly completed HHK
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Year round employment
Technical Aspects
Financial Aspect
Cost of production per brick Tk 1.35 - 1.60
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Arched tunnel of HHK
Construction of Coal Chutes of HHK |
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Project Fact Sheet
Thematic Area
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
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 |
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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:
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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:
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.
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![]() Side View of nearly completed HHK
Arched tunnel of HHK
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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:
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![]() Demo HHK
Construction process |
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| 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. |
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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
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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:
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Arch Construction
Kiln top |
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Key Financial Indicators
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The following major assumptions influence the profitability of the kiln:
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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
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