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High-temperature smoke heat exchanger for urea pyrolytic process

A high-temperature flue gas and heat exchanger technology, which is applied in the field of high-temperature heat exchangers, can solve the problems of easy fouling and damage of heat exchangers, and achieve the effects of reasonable load-bearing distribution, avoiding cracking, and ensuring stable connection.

Inactive Publication Date: 2014-05-07
昆山市三维换热器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a high-temperature flue gas heat exchanger for urea pyrolysis process, which solves the problem that the heat exchanger is easy to accumulate dust and easy to be damaged in the prior art

Method used

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  • High-temperature smoke heat exchanger for urea pyrolytic process
  • High-temperature smoke heat exchanger for urea pyrolytic process
  • High-temperature smoke heat exchanger for urea pyrolytic process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one: see figure 1 and figure 2 As shown, a high-temperature flue gas heat exchanger used in the urea pyrolysis process adopts a shell-and-tube heat exchange structure, including a shell 1, a heat exchange tube bundle 2 set in the shell 1, and a heat exchange tube bundle 2 set in the shell 1. The upper shell-side inlet 11 and the shell-side outlet 12, the heat exchange tube bundle 2 are vertically arranged, and the upper and lower ends of the shell 1 are connected with the heat exchange tube bundle 2, and an upper tube box 3 and a lower tube box 4 are arranged. A heat insulation structure 5 is arranged on the tube sheet 31 , and the upper ends of each heat exchange tube pass through the heat insulation structure 5 and communicate with the upper tube box 3 . The inner side of the upper tube box 3 and the inner side of the upper head 32 are provided with an insulating layer. The inlet and outlet of the shell side are located on the same side of the shell 1, t...

Embodiment 2

[0036] Embodiment 2: A urea pyrolysis ammonia production device for denitrification, including a flue gas running pipeline, an air running pipeline, a urea pyrolysis chamber, and a heat exchanger. The high-temperature flue gas in the flue gas running pipeline Exchange heat with the air in the air running pipeline at the heat exchanger, and the heated air enters the urea pyrolysis chamber as a heat source for urea pyrolysis, wherein the heat exchanger adopts the high-temperature flue gas heat exchanger of Embodiment 1 , the flue gas running pipeline is connected to the tube side of the high-temperature flue gas heat exchanger, and the air running pipeline is connected to the shell side of the high-temperature flue gas heat exchanger.

[0037] According to the needs, install fans, air ducts, and air flow regulating doors in the air running pipeline; set flue gas flow regulating doors, flue gas pipes, and induced draft fans in the flue gas running pipeline; set urea spray guns in ...

Embodiment 3

[0038] Embodiment 3: A high-temperature flue gas heat exchanger for urea pyrolysis process adopts a shell-and-tube heat exchange structure, including a shell, a heat exchange tube bundle set in the shell, and a shell side set on the shell The inlet and outlet, the heat exchange tube bundles are arranged vertically, the upper and lower tube boxes are connected with the heat exchange tube bundles at the upper and lower ends of the shell, and the upper tube box and the lower tube box are arranged. It passes through the heat insulation structure and communicates with the upper pipe box. The inner side of the upper tube box and the inner side of the upper head are provided with an insulating layer.

[0039] In this embodiment, the shell-side inlet and the shell-side outlet are located on both sides of the shell, and two sets of baffles are arranged on the heat exchange tube bundle, the shell-side inlet is located under the lower baffle, and the shell-side outlet is located at the u...

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Abstract

The invention discloses a high-temperature smoke heat exchanger for a urea pyrolytic process. The high-temperature smoke heat exchanger adopts a tube-shell heat exchanging structure and comprises a shell, a heat exchanging tube bundle which is arranged in the shell and a shell-side inlet-outlet which is arranged on the shell, and the high-temperature smoke heat exchanger is characterized in that the heat exchanging tube bundle is arranged in the vertical manner, the upper end and the lower end of the shell are communicated with the heat exchanging tube bundle and provided with an upper tube header and a lower tube header, an upper tube plate is provided with a heat insulation structure, and the upper end of each heat exchanging tube penetrates the heat insulation structure to be communicated with the upper tube header. The high-temperature heat exchanger adopts the vertical-type structure, and the upper tube plate is provided with the heat insulation layer, so that the impact of the high temperature on the upper tube plate can be reduced, and the high-temperature smoke heat exchanger can be used for the heat exchanging of the high-temperature smoke.

Description

technical field [0001] The invention relates to a high-temperature heat exchanger, in particular to a heat exchanger using high-temperature flue gas used in a urea pyrolysis process. Background technique [0002] Nitrogen oxides in flue gas are one of the main air pollutants. In order to remove nitrogen oxides in the flue gas, the usual method is to use ammonia water as a reducing agent at a temperature of 350-600 degrees. Under the action of a catalyst, the nitrogen oxides in the flue gas undergo a reduction reaction to produce nitrogen and water. Among them, the reducing agent ammonia water is usually prepared by urea pyrolysis process. The conventional urea pyrolysis process uses natural gas, flue gas after fuel oil or electric energy to heat air to pyrolyze urea, which consumes a lot of energy and runs at high cost. [0003] In order to use the heat in the flue gas and reduce energy consumption, the Chinese utility model patent CN202609955U discloses a urea pyrolysis a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D7/00C01C1/08
Inventor 顾安生唐亮陆华洪立新
Owner 昆山市三维换热器有限公司
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