INCINERATION PLANT FOR SOLID MATERIAL AND METHOD FOR REPLACING ITS NOZZLE INSERT

Abstract

An incineration plant for solid material, such as waste or biomass, includes a combustion material inlet through which the solid material is to be introduced, a combustion chamber into which the solid material is introduced and in which the solid material is combusted, whereby flue gases are produced, a combustion grate with which the solid material and combusted solid material can be conveyed through the combustion chamber, a primary air supply below the top of the combustion grate, and at least one nozzle arranged above the combustion grate with which a gaseous medium such as secondary air, tertiary air, and/or an oxygen poor carrier gas can be provided, the at least one nozzle having a gas inlet and a gas outlet.

Claims

1. An incineration plant for solid material, the incineration plant comprising: a combustion material inlet through which solid material can be introduced; a combustion chamber into which the solid material is introduced and in which the solid material is combusted; a combustion grate configured to convey the solid material and combusted solid material through the combustion chamber; a primary air supply below the top of the combustion grate; and at least one nozzle arranged above the combustion grate and configured to provide a gaseous medium, the at least one nozzle having a gas inlet embodied by a nozzle pipe and a gas outlet embodied by an outlet insert; wherein the outlet insert is at least partly inserted in the nozzle pipe and is connected to the nozzle pipe by a welded joint arranged on the outside of the nozzle pipe.

2. The incineration plant according to claim 1, wherein the welded joint is accessible from the combustion chamber.

3. The incineration plant according to claim 1, wherein the outlet insert has a flange which abuts against an end face of the nozzle pipe, and wherein the welded joint is provided between the flange and an outer circumference of the end face of the nozzle pipe.

4. The incineration plant according to claim 1, wherein the nozzle pipe is arranged in a wall delimiting the combustion chamber, wherein the nozzle pipe protrudes into the combustion chamber, and wherein the welded joint is arranged on a section of the nozzle pipe that extends into the combustion chamber.

5. The incineration plant according to claim 1, wherein the welded joint is embodied by at least one of a continuous welding seam, multiple welding beads, and multiple welding points.

6. The incineration plant according to claim 1, wherein the outlet insert comprises at least one of a multiple outlet part, a deflecting part, and a swirling part.

7. The incineration plant according to claim 1, further comprising: an empty pass downstream of the combustion chamber; a heat recovery steam generator downstream of the empty pass; a flue gas purification device downstream of the heat recovery steam generator.

8. A method for replacing a used outlet insert of a nozzle in an incineration plant, the method comprising: destroying a welded joint between the used outlet insert of the nozzle and a nozzle pipe, the welded joint arranged on the outside of the nozzle pipe; removing the used outlet insert from the nozzle pipe; inserting a new outlet insert into the nozzle pipe; and welding the new outlet insert to the nozzle pipe.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a side view of a part of an incineration plant.

[0025] FIG. 2 is a sectional view of a nozzle of the incineration plant having a nozzle pipe and an outlet insert.

DETAILED DESCRIPTION OF THE EMBODIMENT

[0026] The present disclosure and the technical background will now be explained with regard to the figures, which show an exemplary embodiment of the invention.

[0027] The incineration plant of the present disclosure comprises a combustion chamber 2 with a combustion material inlet 1, through which solid combustion material such as waste can be introduced in the combustion chamber 2. At the bottom of the combustion chamber 2, a combustion grate 3 is embodied, with which the solid material and combusted material (i.e., ashes) can be transported towards a slag outlet 4.

[0028] Primary air for the combustion of the solid material is supplied from below the combustion grate 3. The flue gases produced in the combustion chamber 2 are supplied into vertically extending empty passes 5. Downstream of the empty passes 5, a horizontally extending heat recovery steam generator 6 is arranged.

[0029] In the heat recovery steam generator 6, a superheater heat exchanger 7, an evaporator heat exchanger 8 and an economizer heat exchanger 9 are arranged, which are all connected to one common boiler drum 10.

[0030] In FIG. 2, a nozzle for providing a gaseous medium, such as secondary air, tertiary air, and/or an oxygen poor carrier gas into the combustion chamber 2 is depicted.

[0031] The combustion chamber 2 is delimited by a wall 15. The nozzle comprises a nozzle pipe 11 and an outlet insert 12. The nozzle pipe 11 is connected on the left side to a common supply of gaseous medium (not shown). The nozzle pipe 11 extends through the wall 15 into the combustion chamber 2.

[0032] The outlet insert 12 is inserted into the nozzle pipe 11, wherein the outlet insert 12 comprises a flange 13, which abuts against an end face of the nozzle pipe 11.

[0033] The outlet insert 12 is connected to the nozzle pipe 11 by a welded joint 13, which is arranged at an outer circumference of the nozzle pipe 11 and behind the flange 14.

[0034] The outlet insert 12 can be easily exchanged by destroying the welded joint 13, so that afterwards the outlet insert 12 can be removed from the nozzle pipe 11. After inserting a new outlet insert 12, the new outlet insert 12 can be connected to the nozzle pipe 11 by welding.

[0035] While the depicted embodiment of the outlet insert 12 only has a slightly smaller inner diameter than the inner diameter of the nozzle pipe 11, the outlet insert 12 may also have different elements (such as diverters, swirlers, or similar) in order to affect the flow properties of the provided gaseous medium.

[0036] The features, structures, effects and the like described in the foregoing embodiments are included in one embodiment of the present disclosure and are not necessarily limited to one embodiment. Moreover, the features, structures, effects and the like illustrated in each embodiment may be combined or modified by those skilled in the art for other embodiments to be carried out. Therefore, the combination and the modification of the present disclosure are interpreted to be included within the scope of the present disclosure as defined in the accompanying claims.