Detachable pipe bundle flue type heat collection equipment and method

Abstract

The invention relates to the technical field of afterheat utilization of waste heat exhaust gas, and discloses detachable pipe bundle flue type heat collection equipment. The detachable pipe bundle flue type heat collection equipment is formed by communicating an exhaust gas air flue (3) of a heat exchange pipe bundle assembly positioned in a framework assembly (2) with an exhaust gas outlet air flue (11) by an exhaust gas inlet air flue (1), wherein the heat exchange pipe bundle assembly at least comprises a plurality of detachable heat exchange pipe bundle units (12) which are connected in series along the flue direction. The detachable pipe bundle flue type heat collection equipment has the characteristics of compact and reasonable structure, convenience in repairing and replacement, reduction of equipment repairing cost and the like; the workload of on-site repairing is reduced, the downtime for equipment repairing is shortened, and the production cost is reduced; meanwhile, high product competitiveness can be created for the flue type heat collection equipment in the field of industrial afterheat recycling, and the detachable pipe bundle flue type heat collection equipment can be better applied and popularized in a low-temperature exhaust gas afterheat recycling system, and has a considerable prospect.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of waste heat and flue gas waste heat, in particular to a detachable tube-bundle flue-type heat collection device and method. Background technique [0002] In recent years, with the shortage of energy, environmental pollution and scientific and technological progress, the recovery and utilization of low-temperature waste heat and flue gas waste heat have been paid more and more attention at home and abroad, and new progress has been made. In the low-temperature industrial waste heat recovery system, a flue gas waste heat recovery system is generally installed on the low-temperature flue to recover the waste heat of the flue gas. As the core equipment in the flue gas waste heat recovery system, the flue-type heat collection equipment directly determines the waste heat that can be recovered and the investment-output ratio. Flue gas waste heat recovery is of great significance. It c...

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Problems solved by technology

[0003] Flue gas waste heat recovery equipment, especially medium and large flue gas waste heat boilers, mainly has the following defects: 1. The equipment is bulky and inconvenient to transport. It requires on-site welding and assembly, which requires a large workload and high installation costs; 2. The built-in tube bundles are tightly arranged. , the amount of soot in the low-temperature flue gas is large, and often contains highly corrosive sulfide media. If the equipment is operated for a long time, the soot scaling will adhere to the surface of the heat exchange tube and gather at the dead corner of the tube bundle support plate, etc., which is difficult to clean thoroughly. The scale layer will accumulate thicker and make the flue gas side resistance of the waste heat recovery equipment far exceed the design value, which greatly reduces the heat exchange efficiency of the equipment. Sulfur oxides, combined with water vapor, form sulfuric acid vapor (generally, the acid dew temperature of flue gas is 125~145°C)

When the temperature of the metal tube wall of the heat exchanger is lower than the condensation point of sulfuric acid vapor (called acid dew point), liquid sulfuric acid (called condensation) will be formed on its surface to cause acid dew corrosion and leakage on the heat exchange tube wall, causing the whole set The unit is scrapped and replaced, causing large economic losses to the enterprise

At present, the main methods to solve acid dew corrosion are: 1. Increase the temperature of the pipe wall of the flue gas waste heat recovery equipment, so that the exhaust gas temperature is higher than the dew point temperature of the flue gas, which causes a large amount of waste of heat energy that cannot be recovered and environmental pollution

2. Use corrosion-resistant materials, such as stainless steel pipes, glass enamel pipes, corrosion-resistant low-alloy pipes, etc., but due to the limitations of the price of these materials or conditions of use, the equipment cost is greatly increased

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