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A kind of SO2 ultra-low emission and slightly variable temperature energy-saving smoke elimination system

A SO2, smoke elimination technology, applied in gas treatment, dispersed particle separation, membrane technology and other directions, can solve the problems of obvious impact effect of flue gas flow blocking, not smooth air flow transition, and increased energy consumption of flue gas system, etc. The effect of reducing water vapor evaporation, reducing water evaporation and prolonging residence time

Active Publication Date: 2018-06-15
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional single-tower single-pH control can only find a relatively compromised control range between high and low pH, and cannot completely solve this contradiction
At present, the single-tower double-cycle desulfurization towers used in China use conical bottom collecting bowls and slurry deflectors. The impact effect of flue gas flow blocking is obvious, the air flow transition is not smooth enough, and the distribution uniformity is poor, resulting in large flue gas flow resistance and smoke The energy consumption of the wind system has increased significantly

Method used

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  • A kind of SO2 ultra-low emission and slightly variable temperature energy-saving smoke elimination system
  • A kind of SO2 ultra-low emission and slightly variable temperature energy-saving smoke elimination system
  • A kind of SO2 ultra-low emission and slightly variable temperature energy-saving smoke elimination system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The single-tower double-pH desulfurization system of the present invention: includes a high-pH spray device 2 and a low-pH spray device 3 arranged in the desulfurization tower 1, connecting pipelines, a high-pH slurry suspension oxidizer, a low-pH slurry suspension oxidizer, and a high-pH slurry suspension oxidizer. pH slurry tank 22 and low pH slurry tank 32 . The high pH slurry tank 22 and the low pH slurry tank 32 are separated and arranged at the bottom of the tower.

[0033] Both the high-pH spraying device 2 and the low-pH spraying device 3 are equipped with multi-layer spraying heads; the high-pH and low-pH slurry suspension oxidizers include agitators, oxidation spray guns, filter screens and containers.

[0034] The feature of the double pH desulfurization system is to wash the flue gas in different areas. The first stage arranged in the lower layer is a low pH washing area with a pH control range of 4-5.4; the second stage arranged in the upper layer is a high...

Embodiment 3

[0039] Such as figure 1 As shown, the double-pH spray desulfurization tower bi-directional rectification and liquid guide device of the present invention is arranged between the high and low pH spray devices in the desulfurization tower, including a wall flow drainage ring and a bowl-shaped liquid accumulation pan.

[0040] Such as figure 2 As shown, the wall flow drainage ring 4 is composed of an upper distribution arc ring 41, a lower distribution arc ring 41 and a vibrating liquid separation ring 44. The upper and lower distribution arc rings are equivalent in shape and arranged symmetrically with their backs facing away. The concave surface faces outward, and the two rings The outer edges are respectively installed on the inner wall of the desulfurization tower, and the outer edges of the two rings touch and connect, and the inner ring of the inner edge is connected to the vibrating liquid separation ring 44;

[0041] The bowl-shaped effusion tray 5 is arranged directly ...

test example 1

[0055] A certain flue gas volume of 50,000 m 3 / h desulfurization test device, the number of spray layers of the absorption tower is the same, and the test comparison of the following situations is carried out;

[0056] Scenario 1: empty tower, 3-layer spray, single pH control, two-stage demister;

[0057] Scenario 2: The dual-pH spray desulfurization tower bi-directional rectification liquid guide device in Example 2 is used to realize pH partitioning. The high-pH spray device is installed on the top of the device, and the low-pH spray device is installed on the bottom. Two layers, two-stage demisting A phase-change deep purifier is added between the desulfurization towers, a cooling flow equalizer is installed at the inlet of the desulfurization tower, and a micro-heating smoke eliminator is installed at the outlet.

[0058] Scenario 3: Using image 3 The existing single-tower double-circulation desulfurization tower shown is conical (conical tray is used, and the guide ri...

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Abstract

The invention develops and designs a micro-temperature-variation energy-saving and smoke-eliminating system with ultra-low SO2 emission. The micro-temperature-variation energy-saving and smoke-eliminating system is used in a desulfurization tower with a high pH spray device and a low pH spray device, and mainly comprises a temperature-reducing and flow-equalizing device, a phase-change deep purifier, a gently heating temperature-rising smoke eliminator, pumps and connecting pipelines, wherein the temperature-reducing and flow-equalizing device is arranged in an inlet flue in the desulfurization tower; the phase-change deep purifier is arranged between a primary demister and a secondary demister which are arranged above the high pH spray device; the gently heating temperature-rising smoke eliminator is arranged in an outlet flue in the desulfurization tower; a heat-transfer medium in the temperature-reducing and flow-equalizing device and a heat-transfer medium in the gently heating temperature-rising smoke eliminator flow through the circulating pumps and the connecting pipelines, so as to form a circulation loop; the circulation loop is connected to an open-type cold source through a control valve. The micro-temperature-variation energy-saving and smoke-eliminating system is mainly used for desulfurizing coal-fired flue gas efficiently and eliminating smoke plume of smoke subjected to desulfurization, so that the purposes of ultra-low SO2 emission and smoke plume elimination are realized.

Description

Technical field: [0001] The present invention provides a SO 2 An ultra-low emission micro-variable temperature energy-saving smoke elimination system belongs to the technical field of resource environment flue gas purification. Background technique: [0002] With the control of air pollutants in thermal power plants entering the ultra-low emission stage, the control requirements for the concentration of sulfur dioxide emissions in flue gas from thermal power plants have changed from the national standard GB13223-2011 to 200mg / m 3 down to 35mg / m 3 Below, that is, ultra-low emissions, some local standards even require measures to eliminate plumes. At present, the conventional limestone-gypsum desulfurization process used is controlled by single tower spraying and single pH value, and the desulfurization efficiency is generally 95%. And uneconomical operation, poor adaptability to working conditions and other issues. Regarding the elimination of smoke plume, the original ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/50B01D53/80B01D2258/0283
Inventor 许月阳薛建明管一明王宏亮陈书建戴伟伟付森林
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD