Search

CN-121988156-A - Flue gas desulfurization system of thermal power plant and treatment method thereof

CN121988156ACN 121988156 ACN121988156 ACN 121988156ACN-121988156-A

Abstract

The invention discloses a flue gas desulfurization system of a thermal power plant, which comprises a desulfurization tower and an alkali liquor circulation tank, wherein a recovery disc, an adsorption mist removing box and a smoke exhaust pipe are arranged in the desulfurization tower from bottom to top, the smoke inlet pipe is connected between the recovery disc and the adsorption mist removing box, the recovery disc is connected to the alkali liquor circulation tank through a recovery pipe, the alkali liquor circulation tank is connected to the adsorption mist removing box through a liquid supply pipe, the liquid supply pipe stretches into the adsorption mist removing box, a plurality of layers of fins are arranged in the adsorption mist removing box, the fins are fixed on the liquid supply pipe, a plurality of atomizing spray heads are arranged on the liquid supply pipe, the atomizing spray heads are positioned on the outer sides of the fins, and an electric mist eliminator is arranged at the bottom of the smoke exhaust pipe. The invention can improve the defects of the prior art, combines spraying adsorption and demisting into a whole, simplifies the structure and improves the desulfurization demisting effect.

Inventors

  • MA SHUAI
  • ZHANG RUOYU

Assignees

  • 马帅

Dates

Publication Date
20260508
Application Date
20260319

Claims (8)

  1. 1. A flue gas desulfurization system of a thermal power plant comprises a desulfurization tower (1) and an alkali liquor circulation tank (2) and is characterized in that a recovery disc (3), an adsorption mist removing tank (4) and a smoke exhaust pipe (5) are arranged in the desulfurization tower (1) from bottom to top, a smoke inlet pipe (6) is connected between the recovery disc (3) and the adsorption mist removing tank (4), the recovery disc (3) is connected to the alkali liquor circulation tank (2) through a recovery pipe (7), the alkali liquor circulation tank (2) is connected to the adsorption mist removing tank (4) through a liquid supply pipe (8), the liquid supply pipe (8) stretches into the adsorption mist removing tank (4), a plurality of layers of fins (9) are arranged in the adsorption mist removing tank (4), the fins (9) are fixed on the liquid supply pipe (8), a plurality of atomizing spray heads (10) are arranged on the liquid supply pipe (8), the atomizing spray heads (10) are located on the outer sides of the fins (9), and an electric mist eliminator (11) is arranged at the bottom of the smoke exhaust pipe (5).
  2. 2. The flue gas desulfurization system of a thermal power plant according to claim 1, wherein a filter screen (12) is obliquely arranged in the alkali liquor circulation tank (2), a recovery pipe (7) is connected to one end, close to the position of the filter screen (12), above the filter screen (12, a precipitation discharge pipe (13) is connected to one end, close to the position of the filter screen (12), lower than the filter screen (12), and an alkali liquor replenishing pipe (14) and a cooling water circulation pipe (15) are arranged below the filter screen (12).
  3. 3. The flue gas desulfurization system of a thermal power plant according to claim 1, wherein the fins (9) comprise bases (16) fixed on the surfaces of the liquid supply pipes (8), guide vanes (17) are arranged on the upper portions of the bases (16), contact pieces (18) are arranged on the upper portions of the guide vanes (17), flue gas return pipes (19) are fixed on the bases (6), the flue gas return pipes (19) are connected with the flue gas discharge pipes (5), a pressurizing fan (20) is arranged on the flue gas discharge pipes (5), and a plurality of flue gas vent holes (21) are formed in positions, close to the fins (9), of the flue gas return pipes (19).
  4. 4. A flue gas desulfurization system of a thermal power plant according to claim 3 is characterized in that two flue gas vent holes (21) are formed between two adjacent fins (9), one flue gas vent hole (21) faces upwards, the other flue gas vent hole (21) faces downwards, a guide flow hole (22) is formed in a guide vane (17), a baffle plate (23) is arranged at the top of the guide flow hole (22), the width of the baffle plate (23) is equal to the diameter of the guide flow hole (22), and guide flow grooves (24) are respectively formed in two sides of the guide flow hole (22).
  5. 5. A flue gas desulfurization system of a thermal power plant according to claim 4, wherein the surfaces of the contact plates (18) are provided with wire mesh layers (25), the density of the wire mesh layers (25) is gradually reduced from two sides to the middle, and water baffles (26) with high middle and low two ends are arranged between the adjacent contact plates (18).
  6. 6. The flue gas desulfurization system of a thermal power plant according to claim 5, wherein the electric demister (11) comprises a bracket (27) fixed in the flue gas exhaust pipe (5), a rotating motor (28) is installed at the bottom of the bracket (27), a rotating shaft (29) is installed in the rotating motor (28), a plurality of annular liquid collecting plates (30) with different diameters are fixed on the rotating shaft (29), and a plurality of discharge electrodes (31) are inserted between the adjacent annular liquid collecting plates (30).
  7. 7. The flue gas desulfurization system of a thermal power plant according to claim 1, wherein the surface of the annular liquid collecting plate (30) is provided with arc-shaped vent holes (32).
  8. 8. A method for treating a flue gas desulfurization system of a thermal power plant according to any one of claims 1 to 7, comprising the steps of inputting flue gas to be treated into a desulfurization tower (1) from a flue gas inlet pipe (6), inputting alkaline solution into an adsorption demisting box (4) from an alkaline solution circulation tank (2) through a liquid supply pipe (8), enabling the flue gas to enter the adsorption demisting box (4) and then contact alkaline solution sprayed from an atomizing nozzle (10), absorbing acid gas in the flue gas by the alkaline solution, cooling the flue gas while passing through a fin (9), condensing water mist in the flue gas into water drops on the surface of the fin (9) to be separated from the flue gas, performing secondary demisting on the flue gas passing through the adsorption demisting box (4) by an electric demister (11) when entering the flue gas outlet pipe (5), and finally discharging the flue gas after absorbing the acid gas by the alkaline solution to a recovery disc (3), and refluxing the flue gas to the alkaline solution circulation tank (2) through the recovery pipe (7).

Description

Flue gas desulfurization system of thermal power plant and treatment method thereof Technical Field The invention relates to the technical field of industrial flue gas treatment, in particular to a flue gas desulfurization system of a thermal power plant and a treatment method thereof. Background The flue gas discharged by the thermal power plant unit contains a large amount of acid gas mainly containing sulfur dioxide, and if the acid gas is directly discharged, serious pollution is caused to air, so that the flue gas of the thermal power plant needs to be subjected to strict desulfurization treatment before being discharged. For example, chinese patent 202510644818.5 discloses a typical desulfurizing tower structure. The prior desulfurizing tower structure can contain a large amount of weak alkaline water mist in the flue gas after adsorption desulfurization by using alkali liquor, so that the flue gas can be discharged after defogging. However, the existing desulfurizing towers are provided with demisting devices after spraying and adsorbing, so that the desulfurizing towers are complex in structure and large in size. Disclosure of Invention The invention aims to solve the technical problem of providing a flue gas desulfurization system of a thermal power plant and a treatment method thereof, which can solve the defects of the prior art, integrate spray adsorption and demisting, simplify the structure and improve the desulfurization and demisting effect. In order to solve the technical problems, the technical scheme adopted by the invention is as follows. A flue gas desulfurization system of a thermal power plant comprises a desulfurization tower and an alkali liquor circulation tank, wherein a recovery disc, an adsorption mist removing box and a smoke exhaust pipe are arranged in the desulfurization tower from bottom to top, the smoke inlet pipe is connected between the recovery disc and the adsorption mist removing box, the recovery disc is connected to the alkali liquor circulation tank through a recovery pipe, the alkali liquor circulation tank is connected to the adsorption mist removing box through a liquid supply pipe, the liquid supply pipe stretches into the adsorption mist removing box, a plurality of layers of fins are arranged in the adsorption mist removing box, the fins are fixed on the liquid supply pipe, a plurality of atomizing spray heads are arranged on the liquid supply pipe, the atomizing spray heads are located on the outer sides of the fins, and an electric mist remover is arranged at the bottom of the smoke exhaust pipe. Preferably, a filter screen is obliquely arranged in the alkali liquor circulation tank, the recovery pipe is connected to one end, close to the higher position of the filter screen, one end, close to the lower position of the filter screen, of the recovery pipe is connected to a precipitation discharge pipe, and an alkali liquor replenishing pipe and a cooling water circulation pipe are arranged below the filter screen. Preferably, the fin comprises a base fixed on the surface of the liquid supply pipe, a guide vane is arranged on the upper portion of the base, a contact sheet is arranged on the upper portion of the guide vane, a smoke return pipe is fixed on the base and connected with a smoke exhaust pipe, a pressurizing fan is arranged on the smoke exhaust pipe, and a plurality of smoke vent holes are formed in the position, close to the fin, of the smoke return pipe. Preferably, two flue gas vent holes are arranged between two adjacent fins, one flue gas vent hole faces upwards, the other flue gas vent hole faces downwards, a deflector is arranged on the deflector, a baffle plate is arranged at the top of the deflector, the width of the baffle plate is equal to the diameter of the deflector, and the two sides of the deflector are respectively provided with a deflector groove. Preferably, the surface of the contact piece is provided with a wire mesh layer, the density of the wire mesh layer is gradually reduced from two sides to the middle, and water baffles with high middle and low two ends are arranged between the adjacent contact pieces. Preferably, the electric demister comprises a bracket fixed in the smoke exhaust pipe, a rotating motor is installed at the bottom of the bracket, a rotating shaft is installed in the rotating motor, a plurality of annular liquid collecting plates with different diameters are fixed on the rotating shaft, and a plurality of discharge electrodes are inserted between the adjacent annular liquid collecting plates. Preferably, the surface of the annular liquid collecting plate is provided with arc-shaped vent holes. The treatment method of the flue gas desulfurization system of the thermal power plant comprises the following steps that flue gas to be treated is input into a desulfurization tower from a flue gas inlet pipe, alkali liquor is input into an adsorption demisting box from an alkali liquor circulation tank through a li