The catalytic filter was fabricated by supporting selective catalytic reduction (SCR) catalyst on the low-density ceramic (LDC) for the removal of dust and nitrogen oxides (NO_x) in the flue gases at relative low temperature. MnO_x–ZrO₂/TiO₂ catalyst was selected as SCR catalyst. The NO_x and dust removal efficiency, filter resistance, regeneration performance and anti-sulfur performance were investigated. The result showed that the NO_x removal efficiency at 180°C reached 98.4% (1 m/min filtration velocity) for 6 wt% MnO_x–ZrO₂/TiO₂ catalytic filter with Mn/Zr molar ratio of 2. Furthermore, MnO_x–ZrO₂/TiO₂ catalytic filter performed good anti-sulfur performance. In the presence of 10 vol% water vapor and 100 ppm SO₂ at 180 °C, the NO_x removal efficiency for MnO_x–ZrO₂/TiO₂ catalytic filter could retain up to 83.2% and it could recover to 91.8% when the water vapor and SO₂ were cut off. MnO_x–ZrO₂/TiO₂ catalytic filter showed the high dust removal efficiency of 99.99% and the low filter resistance of less than 200 Pa. The filter resistance of MnO_x–ZrO₂ /TiO₂ catalytic filter could maintain 235.7 Pa after 200 times pulse blowback. The result illustrated that MnO_x–ZrO₂/TiO₂ catalytic filter showed good regeneration performance.

Mn-Co-based catalysts were loaded to ceramic filters element by impregnation for the coprocessing of dust and nitrogen oxide (NO_x) in flue gas. The influence of the Mn/Co ratio and loading on the catalytic performance was investigated. The Mn-Co-based catalytic ceramic filter with a Mn/Co molar ratio of 2/1 can achieve 99% NO conversion by selective catalytic reduction of NO_x with NH₃ (NH₃-SCR) in the temperature range of 100−180 °C, but its resistance to H₂O was relatively poor. The filter element was modified by PTFE to improve the H₂O resistance. After modification, the catalytic ceramic filter showed superior resistance to H₂O and SO₂ at low temperatures (100–180 °C) and satisfactory self-cleaning performance.

The Fe-Mn based catalyst was loaded on porous ceramic filter with impregnation method to prepare a catalytic ceramic filter which integrates the denitration and dust removal at low temperature. The effect of the Fe/Mn ratio and doping Sm on the catalytic performance of Fe-Mn based catalyst were studied. In the temperature range of 120 °C–220 °C, the Fe₂Mn₁Sm_0.2O_x catalytic filter exhibited over 90% NO removal efficiency. When 100 ppm SO₂ and 7vol.% H₂O in the flue gas, the NO removal efficiency still maintained above 89% at 200 °C. These results proved that the Fe₂Mn₁Sm_0.2O_x catalytic filter has excellent catalytic performance and excellent H₂O and SO₂ resistance at low temperature. In addition, the dust collection efficiency reached 99.99%. The NH₃-TPD, H₂-TPR and XPS confirmed that the Fe₂Mn₁O_x catalysts doped with Sm have stronger surface acid, more surface absorbed oxygen and more oxygen vacancy, which lead to higher NH₃-SCR activity and better SO₂ and H₂O resistance.

V2O5-WO3-TiO2 catalytic filter was prepared for particle separation and denitration. TiO2 was supported on mullite fiber filtration ceramic (FFC) by homogeneous precipitation method and V2O5-WO3 denitration catalyst was loaded on TiO2/FFC by impregnation method using the solution of V and W precursors. The BET surface area of TiO2/FFC measured by N2 adsorption was increased with TiO2 loading. The results indicated that the surface modification by anatase TiO2 improved the BET surface area of filters. The optimal mass ratio of V2O5 to WO3 with 1:1 and catalyst loading of 7.5 wt% were determined. The performance tests for V2O5-WO3-TiO2 catalytic filters showed that NO conversion was more than 80% and filter resistance at the filtration velocity of 1m/min was 415 Pa. Moreover, the effects of filtration velocity and SO2 or H2O poisoning on NO conversion were investigated. Catalytic filters still showed approximately 80% NO conversion even if the filtration velocity reached 1.5m/min. NO conversion decreased to 68% in the presence of 300 ppm of SO2 and 10 vol% H2O at 280°C, but it could be recovered to 85% after the removal of SO2 and H2O.

The calculation of water-hammer pressure phenomenon of single-phase liquid is already more mature for a pipeline of uniform characteristics, but less research has addressed the calculation of slurry water hammer pressure in complex pipelines with slurry flows carrying solid particles. In this paper, based on the developments of slurry pipelines at home and abroad, the fundamental principle and method of numerical simulation of transient processes are presented, and several boundary conditions are given. Through the numerical simulation and analysis of transient processes of a practical engineering of long-distance slurry transportation pipeline system, effective protection measures and operating suggestions are presented. A model for calculating the water impact of solid and fluid phases is established based on a practical engineering of long-distance slurry pipeline transportation system. After performing a numerical simulation of the transient process, analyzing and comparing the results, effective protection measures and operating advice are recommended, which has guiding significance to the design and operating management of practical engineering of longdistance slurry pipeline transportation system.