Regeneration technology of V-Ti-based honeycomb SCR denitration catalyst, and apparatus thereof

A denitration catalyst and honeycomb technology are applied in the regeneration process of vanadium-titanium-based honeycomb selective catalytic reduction denitration catalyst and the field of regeneration devices, which can solve the problems of hidden dangers, secondary pollution, long treatment time, etc., and achieve the control of NOx, The effect of saving replacement costs and improving the effect

Inactive Publication Date: 2012-09-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent with the publication number CN 102266723A mainly provides a process of using an autoclave to expand the pores of the catalyst during the regeneration process, but the pore-enlarging agent used in this process, such as methanol, will cause secondary pollution, and the Realizing rapid pressure relief under certain conditions has potential safety hazards, and the process has problems such as long processing time

Method used

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  • Regeneration technology of V-Ti-based honeycomb SCR denitration catalyst, and apparatus thereof
  • Regeneration technology of V-Ti-based honeycomb SCR denitration catalyst, and apparatus thereof
  • Regeneration technology of V-Ti-based honeycomb SCR denitration catalyst, and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Adopt the deactivated vanadium-titanium-tungsten honeycomb Denitrification catalyst. The main components of the catalyst are vanadium, titanium and tungsten. The cross-sectional size of the catalyst is 150mm×150mm. Cut a piece of 40mm×40mm×40mm, and first spray it with pressurized sand filter water for 10 minutes. Then put it in a constant temperature water bath ultrasonic cleaner, at a cleaning frequency of 32kHz, 10kW / m 2 The sound intensity is 40°C for 8 minutes. The composition of the cleaning solution is HPMA (mass percentage concentration is 0.5‰). Spray with deionized water for 5 min after ultrasonic cleaning. Then put it into a solution containing 10g / L sulfuric acid and 0.4‰ oxalic acid for pickling, and bubbles are blown into the bottom of the pickling device. Then put it into a blast drying oven to dry for 20min. The dried catalyst is put into a solution containing 0.1 mol / L vanadyl sulfate and 0.15 mol / L ammonium metatungstate, the pH value of the solut...

Embodiment 2

[0037] Cut a piece of 40mm×40mm×40mm from the catalyst in Example 1, and first use pressurized sand to filter water and spray for 10 minutes. Then put it in a constant temperature water bath ultrasonic cleaner, at a cleaning frequency of 20kHz, 20kW / m 2 sound intensity, wash at 35°C for 10 minutes. The composition of the cleaning solution is HPMA (mass percentage concentration is 0.5‰). Spray with deionized water for 5 min after ultrasonic cleaning. Then put it into a solution containing 50g / L sulfuric acid and 0.4‰ oxalic acid for pickling, and bubbles are blown into the bottom of the pickling device. Then put it into a blast drying oven to dry for 20min. The dried catalyst is put into a solution containing 0.15 mol / L vanadyl sulfate and 0.2 mol / L ammonium metatungstate, the pH value of the solution is adjusted to 2 with sulfuric acid, and the solution is stirred for impregnation. The impregnated catalyst was dried in a blast drying oven for 20 minutes, then placed in a m...

Embodiment 3

[0043] A piece of 40mm×40mm×40mm was cut from the denitration catalyst in Example 1, and was first sprayed with pressurized sand for 5 minutes. Then put it in a constant temperature water bath ultrasonic cleaner, at a cleaning frequency of 18kHz, 20kW / m 2 sound intensity, wash at 40°C for 10 minutes. The composition of the cleaning solution is HPMA (mass percentage concentration is 0.5‰). Spray with deionized water for 5 minutes after cleaning. Then put it into a solution containing 25g / L sulfuric acid and 0.2‰ gallic acid for pickling, and bubbles are blown into the bottom of the pickling device. Then put it into the blast drying oven to dry for 20min. The dried catalyst is put into a solution containing 0.15 mol / L vanadyl sulfate and 0.2 mol / L ammonium metatungstate, the pH value of the solution is adjusted to 2.5 with sulfuric acid, and the solution is stirred for impregnation. The impregnated catalyst was dried in a blast drying oven for 20 minutes, then put into a muf...

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Abstract

The invention discloses a regeneration technology of a V-Ti-based honeycomb SCR denitration catalyst, and an apparatus thereof. A deactivated catalyst in the technology is regenerated through steps of pressurized water spraying, ultrasonic cleaning, secondary pressurized water spraying, air blow drying, active component supplement, secondary air blow drying, step calcining, and the like. Parameters of the regeneration technology, which comprise components of a cleaning solution, a pickling solution and an active supplement solution, are provided. By adopting the technology, the denitration activity of the deactivated catalyst is recovered, the structural strength of the catalyst is maintained, and the SO2 oxidation frequency is reduced. The apparatus used for realizing the technology comprises a pressurized water spraying pool, an ultrasonic cleaning pool, a secondary pressurized water spraying pool, a pickling pool, an air blow drying pool, an active component supplement pool, a secondary air blow drying pool, a calciner and the like which are sequentially arranged, and the device can realize the hoisting transport regeneration of a regeneration module, and has the characteristics of simplicity, convenient operation, and high efficiency.

Description

Technical field: [0001] The invention relates to the engineering technical field of power plant denitrification and catalyst regeneration, in particular to a process and a regeneration device for realizing the regeneration of a deactivated vanadium-titanium-based honeycomb selective catalytic reduction (SCR) denitrification catalyst. It is used to realize the regeneration and utilization of the denitration catalyst and save the cost of catalyst replacement. Background technique: [0002] my country is a country where coal is the main energy source, and the main source of electricity is the direct combustion of coal in thermal power plants. Pollutants emitted by power plants include respirable solid particles, carbon dioxide, sulfur dioxide and nitrogen oxides (NO x ), etc., thus bringing environmental problems such as the greenhouse effect, acid rain, and photochemical smog. Of which nitrogen oxides (NO x ) emissions reached 12.07 million tons in the first half of 2011. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92B01J23/30B01J35/04B01J38/48B01J38/52B01J38/60B01J38/62B01D53/90B01D53/56
Inventor 惠世恩王志鹏高青高振兴赵帅李文杰赵钦欣周屈兰谭厚章李娜
Owner XI AN JIAOTONG UNIV
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