Tunnel-kiln-based waste heat recycling system, tunnel-kiln-based waste heat power generating system and implementation method

Abstract

The invention discloses a tunnel-kiln-based waste heat recycling system, a tunnel-kiln-based waste heat power generating system and an implementation method and solves the problems that the tunnel kiln waste heat utilization efficiency and economical value are low and the like. The tunnel-kiln-based waste heat recycling system comprises steam gatherer (1), a softened water supply device (6) and a heat exchanging pipeline system (3), wherein the steam gatherer (1) is located at a cooling strip of a tunnel kiln and provided with a saturated steam outlet (2), the softened water supply device (6) supplies water for the steam gatherer (1) through a water feed pump (5), and the heat exchanging pipeline system (3) is communicated with the steam gatherer (1) and used for collecting waste heat of the tunnel kiln. A moisture separator (11) is disposed in the steam gatherer (1). Collected waste heat is applied to industries, such as power generation and heating, requiring steam, waste heat of the tunnel kiln is fully utilized, energy conservation and environmental protection are achieved, income of enterprises is increased, and production cost of enterprises is lowered.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction, and specifically relates to a waste heat recovery system based on a tunnel kiln, a waste heat power generation system and a realization method. Background technique [0002] Tunnel kiln is a modern thermal equipment for continuous firing, which is widely used in the firing production of ceramics and bricks. The structure of the tunnel kiln is a long linear tunnel with fixed walls and vaults or ceilings on both sides and the top. The kiln car runs on the track laid at the bottom. Tropical - high temperature zone - burning zone - cooling zone four parts. The high-temperature flue gas generated by combustion flows along the direction of the tunnel kiln to the kiln head under the action of the front flue or induced draft fan of the tunnel kiln, and at the same time gradually preheats the products entering the kiln. This section constitutes the preheating zone of the tun...

AI Technical Summary

Problems solved by technology

[0003] At present, the primary energy (coal) consumed by the tunnel kiln, in addition to the energy that must be consumed for heat dissipation of the kiln, product moisture evaporation, sintering, etc., about 70% of the energy is wasted with flue gas exhaust and product cooling loss

In the prior art, there are mainly two ways of utilizing the waste heat of the tunnel kiln: 1. Utilize the above-mentioned waste heat to dry the adobe. This method can only use about 20% of the waste heat, and the remaining waste heat has not been fully utilized. In addition, direct use of high-grade waste heat to dry bricks will easily lead to excessive heat in the drying kiln, and at the same time greatly reduce the use value of waste heat; 2. The heat below 900 ℃ is automatically cooled through the cooling section, and then used to heat hot water for workers Bathing, the defect of this method is that a large amount of high-grade waste heat is lost, which leads to the reduction of the economic index of waste heat reuse, the waste heat utilization efficiency is low, and it has not been fully utilized. At the same time, it also causes a lot of energy waste and heat source pollution.

[0004] Furthermore, the invention patent with the publication number "CN101545725": Tunnel kiln waste heat power generation process provides a technical solution for using tunnel kiln high-grade waste heat to generate electricity. However, the above-mentioned process must be installed in the preheating section and cooling zone of the tunnel kiln at the same time as the heat exchange device in order to effectively collect the waste heat of the tunnel kiln, which will inevitably affect the temperature of the tunnel kiln preheating section. Reduce the preheating effect of green bricks, so as to affect the quality of the whole brick products

For the technical solution disclosed above, when collecting the waste heat of the tunnel kiln, the general method is to install a heat exchange device on the upper part of the tunnel kiln, such as a heat exchange tube. The waste heat on both sides of the kiln is effectively collected, and the waste heat on the upper part of the tunnel kiln is much smaller than that on both sides of the tunnel kiln, which leads to the inability to make full use of the waste heat of the tunnel kiln

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