DD259570A1 - METHOD AND DEVICE FOR AVOIDING ANTICIPATING IN A REACTOR OF A SMOKE-GAS SINKING SYSTEM - Google Patents

Abstract

The invention relates to a method and a device for preventing caking in reactors of the flue gas desulfurization. This is achieved according to the invention in that ash coarse constituents are fed to the flue gases and the flue gas / ash mixture is introduced tangentially into the reactor. The wall construction used has tangential air inlets with staggered baffles. In the conical lower part of a steering cylinder for discharging the coarse particles is arranged. Fig. 1

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a method and a device for preventing caking in reactors of the flue gas desulfurization.

Characteristic of the known state of the art

Are known a method and apparatus for flue gas desulfurization in a reactor, wherein before and / or in the inflow of the reactor, the incoming flue gas in a additive entraining and distributing main flow and divided in the flow direction and / or transverse to the flow direction divided partial flow and the main flow in in a known manner is cooled by the additive.

The partial flow channel is thereby concentrically incorporated into the reactor via a gap chamber and, like the diffuser arranged in the inflow region and forming an annular gap, serves to achieve a flow close to the wall.

This should prevent wall deposits and dew point undershoots.

Disadvantage:

- In the resulting near-wall flow no additives are included, whereby a large part of the flue gas is not desulfurized.

- Parallel to the wall, a large layer thickness of the near-wall flow is necessary over the entire wall, which is achieved only with large blowing energy (fan).

- The additives carried in the reactor are not reused.

- The method is energy-economically unreasonable.

Also known are a method and apparatus for flue gas desulfurization in a reactor, wherein a partial flow of the flue gas is forced through arranged in the walls of the reactor openings and distributed with the additives in front of the reactor inner wall as a uniform vortex. The reactor is designed as a double wall construction (WP B01 D / 294415 O, DD-PS).

The disadvantage is the reactor space reduction by the fluidized bed hot gases. The mechanical engineering effort is very large with relatively high investment costs.

If the pressure is insufficient, the holes may clog and erosion occurs in the presence of errosive components in the hot gases.

The reactor in double wall construction must be designed for an overpressure.

Object of the invention

The aim of the invention is to prevent the dew point corrosion in reactors of the flue gas desulfurization and to avoid caking of additive material.

Explanation of the essence of the invention

The object of the invention is to heat the reactor walls above the dew point temperature without introducing external heat.

This is inventively achieved in that the ash-coarse components are given to the flue gases and the flue gas-ash mixture is introduced tangentially into the reactor.

The wall construction used has tangential gas inlets with staggered baffles. In the conical lower part of a steering cylinder for discharging the large particles is arranged.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. Showing:

Fig. 1 - the flue gas tract with the sampling points for coarse particles and reactor Fig. 2- Section of the reactor with tangential air inlets

The steam boiler 1 with the coating 2, the ash funnel 3, the flue gas deflection chamber 4 and the ash chute 5 has the common ash hopper 6 with economizer 7 and air preheater 8 (FIG. 1).

The funnel ashtray 9 and the sand line 10 lead into the funnel 6. Between the reactor 11 and the funnel 6 there is an ash-sand hot gas line 12. One or more tangential inlets 14 are arranged in the upper part 13 on the reactor 11.

The reactor interior part has the steering plates 15, in the reactor funnel 16 there is a guide funnel 17 with steering cylinder 18. The funnel outlet consists of the ash and sand collector 19 and the dip tube 20 to which the reactor gas line 21 is connected. Ash 23, sand 24 and ash particles 25 are fed into the tangential inlets 14 with a hot gas flow 27. Due to the tangential injection, the sand and ash portion 28 is concentrated on the outer wall 29. The gradual arrangement of the baffles 15 a uniform distribution of the particles 28 is achieved with steering to the ash hopper 16.

The relatively large heat content of the sand and ash particles 28 causes once a warming of the reactor wall 30, a mechanical cleaning of the reactor wall 30 of caking and further heating of the Reaktorgasrandströmung 31st

The still relatively concentrated sand ash stream 32 enters the free space 33 between hopper wall 16 and hopper 17th

This sand ash stream 32 is directed by means of the steering cylinder 18 in the sand collector 19 so that the reactor gas flow 34 carries little ash sand. This is achieved in that the reactor gas line 21 opens inside the funnel 16 in the dip tube 20, wherein between the sand collector 19 and dip tube 20, a gap 35 and the steering cylinder 18 has a larger diameter than the dip tube 20.

Advantages of the invention

1. Safe ash and sand separation of the boiler

2. Use of the heat content of the sand and ash particles for reactor wall heating

3. Sand separation in front of the rear heating surfaces of the steam boiler

4. Keep the inner wall of the reactor clean

5. No additional drives required

Claims (6)

1. A method for preventing caking in a reactor of a flue gas desulphurisation plant, wherein the reactor wall is flowed by means of flue gases from the current steam boiler operation, characterized in that ash coarse components are abandoned to the flue gases and the flue gas-ash mixture is introduced tangentially into the reactor. 2. The method according to claim 1, characterized in that the coarse components are removed from the current steam boiler operation. 3. The method according to claim 1 and 2, characterized in that the coarse components are peeled off from the flue gas stream of the flue gas deflection chamber within the boiler. 4. The method according to claim 1 and 2, characterized in that the coarse components are removed from the funnels of the coarse cleaning stage of the electrostatic precipitator. 5. The method according to claim 1 and 2, characterized in that the coarse components are removed from the funnels of the flues. 6. A device for preventing caking in a reactor of a flue gas desulfurization plant, wherein the reactor has a double wall construction and a conical lower part with gutter and dip tube, characterized in that the double wall construction has tangential inlet with staggered baffles and is arranged in the conical lower part of a steering cylinder.