the second publicity of environmental impact assessment of boiler energy saving transformation project of nanguo south hodo holding co., ltd
1、brief description of construction project
project name: boiler energy saving transformation project
employer: nanguo south hodo holding co., ltd
construction nature: technical transformation project
construction site: south hodo industrial park, donggang town, xishan district
investment amount: 80 million yuan
construction content and scale: two 75t / h circulating fluidized bed boilers and their supporting environmental protection facilities will be built in the original plant area, and the original two 75t / h chain boilers and a total of 35t industrial small boilers in the surrounding steam pipeline coverage area will be eliminated. the project will not increase production capacity (not involve power capacity increase). after the transformation, the consumption of standard coal can be reduced to achieve the purpose of energy conservation, consumption reduction and emission reduction.
2、overview of the possible impact of the construction project on the environment and the countermeasures and measures to prevent or mitigate the adverse environmental impact
the waste gas discharged by the project is mainly so2, nox, smoke (powder) dust, etc. after taking desulfurization, denitration and dust removal measures such as sncr furnace denitration limestone spraying in the furnace pulse bag dust collector wet limestone desulfurization wet electrostatic dust removal, the emission concentration of each pollutant can be discharged at high altitude after meeting the requirements of corresponding emission limits. according to the prediction results, the hourly concentration, daily average value and annual average value of so2, nox and smoke (powder) dust discharged by the project can meet the requirements of class ii standard of ambient air quality standard (gb3095-2012) at each concerned point and in the evaluation area, and the ambient air quality level will not be changed.
the technical transformation project adopts the rainwater sewage diversion drainage system to collect the process wastewater of the whole plant. the wastewater of the proposed project includes regenerated acid-base wastewater, desulfurization wastewater, spray flushing water of coal handling system, boiler sewage and cooling tower sewage. after pretreatment, some of them are reused, and some of them are collected together with domestic sewage into wuxi houshu sewage treatment co., ltd, it has little impact on the surface water environment.
the following noise control measures are proposed for this phase of the project: in the selection of equipment, the equipment with low noise shall be selected from similar equipment. when signing the equipment supply technical agreement, the equipment noise limit shall be proposed to the manufacturer as an important factor in equipment assessment. the noise of main equipment and auxiliary equipment shall be controlled below 85db (a), otherwise corresponding noise reduction measures shall be taken. the steam turbine generator unit adopts raft foundation to separate it from the main power house. the manufacturer is required to be equipped with thermal insulation shell and lined with sound-absorbing plate to reduce noise and meet the specified standards. for the air compressor with large noise, a closed plant shall be set, a muffler shall be set at the inlet of the air compressor, and the wall material with good sound-absorbing performance shall be used on the inner wall of the air compressor. reduce the interference of air compressor room to the environment. the oxidation fan shall be equipped with a special sound insulation room, and the equipment noise shall not exceed 85db (a). silencers are installed at the inlet of forced draft fan and primary fan, and soft joints are installed at the inlet and outlet of all fans, which can effectively reduce noise. new glass wool is used as sound-absorbing material, and the noise at 1.2m away from the fan inlet is not greater than 90db (a); the coal crusher is arranged indoors, and a vibration isolation foundation is adopted between the coal crusher and the floor, which has an obvious effect on vibration and noise reduction. the boiler start-up and safety valve exhaust are arranged in the open air, with a height of more than 50m. small hole muffler is adopted to reduce exhaust noise. low noise air-conditioning equipment shall be selected, and noise elimination and sound transmission prevention measures shall be taken for inlet and exhaust systems. the air conditioning system in the central control room is equipped with silencing device to keep the end noise of the system not higher than 55db (a).
the ash and gypsum produced in the production process of the project mainly contain silica, calcium sulfate, alumina, iron oxide and other substances, which can be used to make cement, produce building materials, backfill, build roads, make bricks, etc. after the construction unit effectively collects them, they can be sold out for recycling by the manufacturer, and the domestic waste generated by employees' life can be cleaned and transported. the pollution prevention and control measures are feasible and can ensure the discharge of pollutants up to the standard. the above relevant solid waste treatment measures are feasible, and the key is to implement them to prevent secondary pollution. the solid waste of the project will not cause adverse impact on the surrounding environment after being treated in the above way.
effective anti-seepage measures are taken in the plant area, no waste water is discharged, and there is little impact on the groundwater environment.
3、key points of environmental impact assessment conclusions proposed in the environmental impact report
1. comply with industrial policies
according to the guiding catalogue for industrial structure adjustment (2011 version) (revised in 2013), the construction project complies with the industrial policy.
according to the guiding catalogue for structural adjustment of industry and information industry in jiangsu province (2012 version) (szbf [2013] no. 9) and its modified items (sjxy [2013] no. 183), the construction project complies with the industrial policy of jiangsu province.
2. compliance with development planning and environmental planning
the construction project is located in south hodo industrial park, donggang town, xishan district, wuxi city. the area is industrial land. there are no obvious environmental problems and convenient transportation in the project construction area, which meets the overall planning of the local government and the requirements of relevant environmental function zoning.
3. feasibility of pollutant discharge up to standard
strengthen pollution control and take effective treatment measures for the production process:
⑴ the waste gas discharged by the project is mainly so2, nox, smoke (powder) dust, etc. after taking desulfurization, denitration and dust removal measures such as sncr furnace denitration limestone spraying in the furnace pulse bag dust collector wet limestone desulfurization wet electric dust removal, the emission concentration of each pollutant can be discharged at high altitude after meeting the requirements of corresponding emission limits.
⑵ the wastewater of the proposed project includes recycled acid-base wastewater, desulfurization wastewater, spray flushing water of coal handling system, boiler sewage and cooling tower sewage. after pretreatment, some of them are reused, and some of them are collected with domestic sewage for treatment in wuxi houshu sewage treatment co., ltd., which has little impact on the surface water environment. according to the operation experience of each power plant, the wastewater control measures of the project are effective and feasible.
(3) the noise during the operation of the proposed project mainly comes from the noise of various production machinery, equipment and utilities. the main prevention measures are: give priority to low-noise equipment in process design; during the project layout, the equipment with concentrated noise sources shall be arranged in the center of the plant; noise reduction measures such as sound insulation, noise elimination and shock absorption are taken for main noise equipment, vibration isolation and noise elimination measures are taken for pump motors, silencers and fans, steel concrete vibration isolation foundation is adopted for power equipment, and flexible joints (ports) for slow motion and vibration reduction are taken for pipeline and valve interfaces; the green belt shall be set in the enclosure of the plant, and the measures of combining trees, shrubs and grass shall be taken to further play a certain role in sound insulation and noise attenuation. the noise emitted after the completion of the project has a certain impact on the acoustic environment around each measuring point, and the acoustic environment function will not be reduced after superposition with the background value.
⑷ all kinds of solid wastes generated in the production process of the project shall be safely disposed of by the corresponding units, and the general industrial solid wastes shall be collected and sold for recycling by the manufacturer, and the domestic garbage generated by employees shall be cleaned and transported.
the pollution prevention and control measures are feasible and can ensure the discharge of pollutants up to the standard.
through the above analysis, it can be seen that the prevention and control measures adopted by the construction project are technically and economically feasible and can stably discharge various pollutants up to the standard.
4. conformity between regional environmental quality and environmental function after the project is put into operation
after the completion of the project, the waste gas will be discharged up to the standard after treatment, which will not change the regional ambient air and meet the requirements of class ii standard in the ambient air quality standard. the wastewater is taken over from wuxi houshu sewage treatment co., ltd. for advanced treatment and discharged into xibei canal after reaching the standard, which has little impact on the surrounding water environment. vibration reduction, sound insulation and other measures are taken for the main noise equipment of the construction project. the noise impact value at the site boundary will not change the functional requirements of the acoustic environment in the area where the construction project is located, resulting in less pollution impact on the external environment; the solid wastes generated by the project are effectively disposed and will not produce secondary pollution. after the completion of the project, it will have little impact on the surrounding environment and will not cause the decline of regional environmental quality.
5. conclusion
"boiler energy saving transformation project of south hodo" complies with relevant industrial policies, local development planning and land use planning. the pollution prevention and control measures taken are technically and economically feasible, and all kinds of pollution sources can achieve up to standard emission after treatment; after the completion of the project, the heating capacity and thermal efficiency of the unit will be significantly improved compared with the current situation, but the coal consumption and air pollution emission will be reduced. the construction of the project will reduce the emission of atmospheric environmental pollutants in the region and have a positive environmental effect. on the premise of taking corresponding risk prevention measures and emergency plans, the environmental risk is acceptable. from the perspective of environmental impact, the project construction is feasible.
4. the way and time limit for the public to consult the simplified version of the environmental impact report, and the way and time limit for the public to obtain supplementary information from the construction unit or its entrusted environmental impact assessment agency when the public deems it necessary;
in order to enable the public to understand the environmental impact information of the project construction in detail, the simplified environmental impact report is provided. the public can ask the construction unit or the environmental assessment unit for supplementary information. the query date is within 10 working days from the date of information release.
v. scope and main matters of soliciting public opinions
scope of soliciting public opinions: surrounding residents and related groups located in the evaluation area.
main matters for soliciting public opinions:
(1) whether they are satisfied with the environmental conditions around the project and the main environmental problems;
(2) what impact the construction of the project will have on the environment and whether such impact is within an acceptable range;
(3) suggestions on environmental protection of the project;
(4) from the perspective of environmental protection, what is your attitude towards the project? please briefly explain the reasons;
(5) other suggestions and requirements.
6、 specific forms of soliciting public opinions
the public may submit written opinions or telephone consultation to the construction unit or environmental impact assessment unit by letter, fax, e-mail or other convenient means. the environmental impact assessment agency undertaking the assessment will truly record the public's opinions and suggestions in the environmental impact report of the project, and reflect the public's valuable opinions and suggestions to the construction unit and relevant departments of the project.
(1) name and contact information of the construction unit of the construction project
construction unit: nanguo south hodo holding co., ltd
tel: 0510-66868754
email： hddc2016@163.com
address: south hodo industrial park, donggang town, xishan district, wuxi
contact person: onshore engineering
(2) name and contact information of the environmental impact assessment organization undertaking the assessment
eia unit: nanjing guohuan technology co., ltd
tel: 025-86773175
email： renlei918@163.com
contact person: ren gong
address: building 2, no. 11 huayuan road, nanjing
[note]: please provide detailed contact information as far as possible while expressing opinions.
7、 starting and ending time of public comments
time for this consultation: 10 working days from the date of announcement.