DE202018005346U1 - Sludge incinerator - Google Patents

Abstract

Sewage sludge incineration plant with individual burners, characterized in that at least one individual burner (1) consists of a filling shaft (2) which is mounted above a grate (3) and at the level of the grate a combustion duct (4) horizontally from this into a heat exchanger (5) leads.

Description

Sewage sludge incineration belongs to the technical field of waste incineration plants.

Sewage sludge is incinerated in the state of the art in large plants with the addition of aggregates or used as fertilizer. Smaller and medium sludge incinerations are technically feasible. The technology of the plants corresponds to the state of the art of large plants. Fluidized bed combustion dominates the plant engineering, the multi-stage combustion shows advantages in Eimissions- and Ausbrandverhalten. A technology for the combustion of pellets from dried sewage sludge with boilers for municipal and private users could not be found. A combination of the combustion technology with the predrying and pelleting of sewage sludge also does not exist in the prior art.

An amendment to the Sewage Sludge Ordinance, which came into force on 03.10.2017, calls for a recovery of the phosphorus from sewage sludge and, at the same time, soil-based sewage sludge utilization should be significantly reduced.

All of the above-described aspects overwhelm the producers and mean a significantly increased effort for the treatment of sewage sludge and thus a large increase in costs for the operators of the plants.

This problem is solved with the features listed in the protection claim 1.

With this technology every single pellet ( 7 ) burned according to the rocket oven principle. The fuel supply takes place via newly developed single burner ( 1 ). The new overall burner ( 6 ) consists of a defined number of individual burners through which the sewage sludge pellets are supplied. The number of individual burners and their cascading can increase or change the boiler output. The sewage sludge pellets are fed via parallel channels. The parallel feed allows better cascading ( 1 ). For heating, the sewage sludge pellets are introduced in specially developed individual burners from above ( 2 ). After that, each individual pellet burns in its own individual burner. The combustion air should flow via the feed chute and / or externally via a blower ( 9 ). To intensify the heat exchange, rod-shaped, coiled steel inserts (turbulators) are integrated into the boiler. As a result, the heated air is more targeted and repeatedly led to the walls where the heat exchange takes place. The efficiency of the boiler is thereby also increased. After an ember bed has been set up, the sewage sludge pellets are introduced into the single burner. The briquette develops a flame at the lower end, gasifies and creates flue gases. The flue gases are burned. As a result, a good burnout and a high combustion quality can be achieved. For heating, the flue gases must be routed through channels and combustion channels. In this case, a flame path must be met by protection claim 6.

LIST OF REFERENCE NUMBERS

(1)

single burner

(2)

hopper

(3)

rust

(4)

combustion channel

(5)

heat exchangers

(6)

total burner

(7)

individual pellets

(8th)

Ash receptacle

(9)

fan

Claims (6)

Sewage sludge incineration plant with individual burners, characterized in that at least one individual burner (1) consists of a filling shaft (2) which is mounted above a grate (3) and at the level of the grate a combustion duct (4) horizontally from this into a heat exchanger (5) leads. Sewage sludge incineration plant Claim 1 , characterized in that the individual burners are arranged in a cascade and these form the total burner (6). Sewage sludge incineration plant according to one of the preceding claims, characterized in that the individual burners consist of a feed chute, which is at max. 10 mm exceeds the dimension of the individual pellets (7) in its internal dimensions. Sewage sludge incineration plant according to one of the preceding claims, characterized in that the ignition of the individual burner is located above the ash collecting container (8). Sewage sludge incineration plant according to one of the preceding claims, characterized in that the side of the single burner, in the amount of supply for the entire burner, a fan (9) or another air supply is located. Sewage sludge incineration plant according to one of the preceding claims, characterized in that the combustion channel has at least a length of 500 millimeters.

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