, 2026, the tender announcement for the ultra-low emission transformation project of the cement clinker production line of Jinni Company-the ultra-low emission transformation project of the new dry process cement plant was issued.
Construction scale: adopt the self-denitration process technology of high-temperature medium-dust SCR and pre-decomposition system, combine with SNCR denitration, build a new high-temperature medium-dust SCR denitration device (including high-temperature electrostatic precipitator, SCR reactor, ash removal system, ammonia delivery system and ash return system), and optimize the existing staged combustion system; The resistance of the preheater system is reduced, the efficiency is improved, and the dust concentration at the C1 outlet is reduced; the dedusting system at the kiln inlet is expanded, the filter area is increased, and the filter bag and bag cage at the kiln inlet and outlet are replaced; the high-efficiency and energy-saving fan is replaced, and other auxiliary systems are constructed.
Construction contents:
(1) Dust removal system: replace all the filter bags and bag cages of the bag-type dust collector at the kiln head; The transformation of the electric-bag composite dust remover at the kiln inlet follows the principle of saving the old, retaining the original bag area of the electric-bag composite dust remover, removing the internal components of the electric area, using the shell of the electric area, adding two new bag room dust removal areas, connecting with the original bag area to form an integrated bag type dust remover, increasing the overall dust removal and filtration area, and replacing all the filter bags in the original bag area.
(2) Denitration system: The high-temperature medium-dust SCR denitration technology is adopted, and a new high-temperature electrostatic precipitator and SCR reactor are built between the C1 outlet air duct of the preheater and the high-temperature fan. Ash removal device, ash return system, ammonia delivery system and electrical automation control system are built to optimize and transform the decomposition furnace, reduce the background concentration of nitrogen oxides in the decomposition furnace, optimize the existing SNCR denitrification system, realize automatic ammonia injection and precise denitrification, and cooperate with SCR denitrification system to reduce ammonia consumption. Desulfurizer spraying device shall be reserved in the kiln tail system.
(3) Resistance reduction and efficiency improvement of preheater: technical improvement of C1 and C2 stages of preheater is made to reduce the system resistance and improve the gas-solid separation efficiency of C1stage, so that the dust concentration at the outlet of C1stage is lower than 140g/Nm3.
(4) High-efficiency and energy-saving fan upgrading and transformation: replace the high-temperature fan with a high-efficiency and energy-saving fan, and use and transform the thin oil frequency converter and civil foundation according to the fan replacement scheme.
(5) Continuous online monitoring system for flue gas emission (CEMS): replace the existing online monitoring system (CEMS) correspondingly. The performance of CEMS shall meet the requirements of (HJ76-2017). The installation, commissioning and operation of continuous online monitoring system for flue gas emission at kiln head and kiln tail shall meet the requirements of Technical Specification for Continuous Monitoring of Flue Gas (SO2, NOx and Particulate Matter) of Stationary Pollution Sources (HJ75-2017), and set relevant parameters according to commissioning acceptance results and relevant management requirements; According to the technical requirements for data transmission of the automatic monitoring and control system for pollutants (HJ212-2025), the network and acceptance with the ecological environment department are completed, and the effective rate of data transmission is more than 95%; the continuous online monitoring system for flue gas emission at the kiln end (CEMS) "automatic monitoring of ammonia pollution factors" has the function of uploading to the provincial and municipal monitoring platforms, which meets the requirements of Requirements of Technical Specification for Automatic Monitoring of Ammonia in Waste Gas from Stationary Pollution Sources. After the transformation, it is necessary to ensure that the online monitoring data of kiln head and kiln tail are uploaded to the dynamic management and control platform of Gansu Eco-environmental Investigation Center in a timely and stable manner. The station building at the kiln head and tail is equipped with complete equipment and facilities (UPS power cabinet, tables and chairs, printer, etc.). The estimated investment of this
bidding project is 25.8575 million yuan.
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