July 8, 2016: Centre for Science and Environment (CSE) organized a roundtable inviting pollution control equipment manufacturers on Thursday to discuss various technology options available to meet the recently notified emission limiting standards for coal based power plants. The meeting was attended by 32 participants from 18 companies.
Discussions were focused to come up with a technology matrix for different vintages which is cost effective and reliable, also other additional measures essential to push timely compliance. The meeting had three sessions and the key discussions in the sessions were the following
Control of Particulate matter
Significant capacity of Indian coal fired plants were designed for emission control levels below 100mg/Nm3 [after 1996] and 50mg/Nm3 [after 2000], however deviation from design level of emissions remain significant.
ESP underperformance major reasons: 1) Boiler leakages; 2) Hopper level switches bypassed resulting in ash build up and deformation of ESP internals; 3) improper maintenance of rapping and seal air system 4) insulator cracks 5) Old controller systems
Key Up gradation Techniques: 1) adding fields/ESPs, increasing height of ESPs; 2) Flue gas conditioning; 3) Moving electrodes, changing electrodes; 4) Low – low temperature ESP systems, 5) High frequency Transformer-rectifier sets etc.
Control of Sulphur di Oxide
Debate whether pre-2003 plants must control SOx emissions and related techno-economics
Low cost reliable technology to meet 600 mg/Nm3 standard. Options recommended: - partial wet FGD, combined wet FGD, dry FGD
Sorbent injection not possible for immediate take up as there is no enough experience
Control of Oxides of Nitrogen
Control measures – burner modification, Selective non catalytic reduction (SNCR), Selective Catalytic Reduction (SCR)
Mechanism to be specified to ensure necessary approvals for supply of liquefied ammonia, catalyst waste disposal, etc.
Additional suggestions made include,
Minimum technical specification draft be prepared to avoid confusions and facilitate easy tendering process for coal power stations
Ensure policies are put in place to make available the raw materials
Request Ministry of Environment, Forests and Climate Change (MoEF&CC) to make available feasibility report of compliance for each power plant on public domain
Request various government authorities – MoEF&CC, Ministry of Power (MoP), Central Electricity Authority (CEA), Central Electricity Regulatory Authority (CERC) to co-ordinate for evolving financial schemes and tariff recovery mechanism
The meeting concluded with the follow-up action point,
Technology matrix paper be prepared as a measure to increase awareness among various stakeholders especially state thermal power stations
|Introduction by MHPS|
Overview by ISGEC
Overview by BHEL
|Skew Gas flow technology|
|Description of slides|
|ESP Performance Vs Design
by Hammon Research Cottrell
|Sulphur Di Oxide|
by Transparent Technologies
|Oxides of Nitrogen|
|Control of NOx - Technology Options
Overview by ISGEC