CN214038498U

CN214038498U - Online clean glass tubular ultra-low temperature discharges air heater

Info

Publication number: CN214038498U
Application number: CN202023074436.5U
Authority: CN
Inventors: 刘智泉
Original assignee: Daqing Huakai Petrochemical Design Engineering Co ltd
Current assignee: Daqing Huakai Petrochemical Design Engineering Co ltd
Priority date: 2020-12-19
Filing date: 2020-12-19
Publication date: 2021-08-24
Anticipated expiration: 2030-12-19

Abstract

An online cleaning glass tube type ultralow temperature exhaust air preheater is characterized in that modules are distributed from top to bottom; the high-temperature flue gas and the high-temperature air exchange heat at the steel plate heat exchange module section, the medium-temperature flue gas and the medium-temperature air exchange heat at the cast iron plate heat exchange module section, and the heat exchange at the low-temperature section is carried out at the glass tube type heat exchange module section. Two flue gas bypasses are arranged between the second steel plate heat exchange module and the glass tube type heat exchange module, and each flue gas bypass is provided with two flue gas sealing valves; the flue gas flows through the glass tube type heat exchange module for heat exchange and flows out of the flue gas outlet, and the generated condensate is discharged through the sewage draining outlet; during cleaning, the two sealing valves are opened, so that the flue gas does not flow through the glass tube type heat exchange module; under the condition of not shutting down the furnace, the outer wall of the flue gas side of the glass tube is regularly washed on line through the washing port, and the air preheater can be kept to stably run for a long time in an on-line washing mode. The air preheater has low cost, reduces the exhaust gas temperature to below 90 ℃, and resists the low-temperature dew point corrosion of the exhaust gas.

Description

Online clean glass tubular ultra-low temperature discharges air heater

Technical Field

The utility model belongs to the technical field of air heater, a online clean glass tubular air heater is related to.

Background

The heating furnace is a main energy consumption device of oil refining enterprises, and how to reduce the consumption of fuel and improve the thermal efficiency of the heating furnace is more and more important and more concerned by people. At present, an air preheater is mainly adopted to recover the heat of flue gas and preheat combustion air so as to improve the heat efficiency of the heating furnace. The lower the temperature drop of the exhaust gas of the heating furnace, the higher the thermal efficiency of the heating furnace, but when the temperature of the exhaust gas is further reduced to the corrosion temperature of a leak point, the corrosion of the leak point can be caused in the equipment, and the use safety and the service life of the equipment are reduced. When the temperature of the exhaust gas is reduced to 100 ℃ or lower, the heat exchange surface of the air preheater can be condensed with water, and dust in the exhaust gas can be adsorbed on the heat exchange surface, so that the heat exchange efficiency of the heat exchange surface is reduced. How to ensure the safe and stable running of the ultralow temperature air preheater in the full length period is a great problem in the industry.

SUMMERY OF THE UTILITY MODEL

The utility model provides an overcome above-mentioned problem, provide a but online cleaning glass tubular ultra-low temperature exhaust air preheater.

The technical scheme of the utility model:

an on-line cleaning glass tube air preheater comprising three large modules: the steel plate heat exchange module 1, the cast iron plate heat exchange module 2 and the glass tube type heat exchange module 3 are distributed from top to bottom; the high-temperature flue gas and the high-temperature air exchange heat at the steel plate heat exchange module section, although the steel plate heat exchange module is not resistant to low-temperature corrosion, the steel plate heat exchange module has the advantages of high heat transfer efficiency, reduced resistance, long service life and low manufacturing cost in a high-temperature area. The medium-temperature flue gas and the medium-temperature air exchange heat at the heat exchange module section of the cast iron plate, and the heat exchange module of the cast iron plate can bear certain dew point corrosion. The heat exchange of the low-temperature section is carried out at the glass tube type heat exchange module section, and the glass tube can completely resist acid dew point corrosion and has the advantage of easy washing. The exhaust gas temperature of the heating furnace can be reduced to below 90 ℃ by the method, and the heat efficiency of the heating furnace is greatly improved.

A flue gas bypass 5 is arranged between the cast iron plate heat exchange module 2 and the glass tube type heat exchange module 3, and a flue gas sealing valve 7 is arranged below the flue gas bypass 5; the bypass is provided with a bypass valve 6, and the direct exhaust flue is provided with a direct exhaust valve 8. In normal operation the sealing valve 6 is closed, the valve 7 is open and the valve 8 is open. The flue gas flows through the glass tube type heat exchange module 3 for heat exchange, flows out of a flue gas outlet and enters the induced draft fan through the direct exhaust flue; the resulting condensate is discharged through the drain 4. When the glass tube type heat exchange module 3 needs to be cleaned, the valve 6 is opened, the valve 7 is closed, and the valve 8 is closed, so that the smoke gas does not flow through the glass tube type heat exchange module 3; the flue gas directly enters a draught fan 10; under the condition of not stopping the furnace, the outer wall of the flue gas side of the glass tube is regularly washed on line through the washing ports 9, the washing ports 9 are arranged at the upper and lower ports of the glass tube type heat exchange module, and high-pressure water is adopted for alternately washing. The air preheater can keep long-term stable operation by an online cleaning mode.

The utility model discloses there are two kinds of structural style, before first form directly causes the draught fan for the flue gas bypass, second kind form causes glass tubular heat exchange module bottom for the flue gas bypass. The two forms can adapt to the use of various complex smoke states.

The air preheater is low in manufacturing cost, can reduce the exhaust gas temperature to 80-90 ℃, is resistant to low-temperature dew point corrosion of the exhaust gas, and can realize online cleaning.

Drawings

Fig. 1 is a front view of a first configuration of the present invention.

Fig. 2 is a side view of a first embodiment of the invention.

Fig. 3 is a front view of a second structure of the present invention.

Fig. 4 is a side view of a second embodiment of the invention.

In the figure: 1, a steel plate heat exchange module; 2, a cast iron plate heat exchange module; 3, a glass tube type heat exchange module; 4, a sewage outlet; 5, flue gas bypass; 6 a bypass valve; 7, a flue gas sealing valve; 8, a direct discharge valve; 9 a flushing port; 10 induced draft fan; 11 hot flue gas inlet; 12 a hot air outlet; 13 a cold air inlet; 14 cold flue gas outlet.

Detailed Description

The following is further explained with reference to the technical solutions and the accompanying drawings.

As shown in fig. 1 and 2, the online cleaning glass tube type air preheater mainly comprises a steel plate heat exchange module 1, a cast iron plate heat exchange module 2, a glass tube type heat exchange module 3, a sewage discharge pipe 4, a flue gas bypass 5, a bypass valve 6, a flue gas sealing valve 7, a direct vent valve 8 and a flushing port 9. The high-temperature flue gas and the high-temperature air exchange heat at the steel plate heat exchange module section, although the steel plate heat exchange module is not resistant to low-temperature corrosion, the steel plate heat exchange module has the advantages of high heat transfer efficiency, reduced resistance, long service life and low manufacturing cost in a high-temperature area. The medium-temperature flue gas and the medium-temperature air exchange heat in the cast iron plate heat exchange module, the cast iron plate heat exchange module can bear certain dew point corrosion, and the manufacturing cost is slightly higher than that of the plate heat exchange module. The heat exchange of the low-temperature section is carried out at the glass tube type heat exchange module section, and the glass tube can completely resist acid dew point corrosion and has the advantage of easy washing. The smoke exhaust temperature of the heating furnace can be reduced to below 90 ℃ by the method. The heat efficiency of the heating furnace is greatly improved.

A flue gas bypass is arranged between a cast iron plate heat exchange module and a glass tube type heat exchange module in an air preheater, and a flue gas sealing valve is arranged on the bypass. When the system normally operates, the bypass sealing valve closes the flue gas to flow through the glass tube type heat exchange module for heat exchange, the flue gas flows out of the direct exhaust flue and enters the induced draft fan, and the generated condensate is discharged through the sewage outlet. When the glass tube type heat exchange module needs to be cleaned, the valve on the bypass can be opened, so that the smoke gas does not flow through the glass heat exchanger. At the moment, the outer wall of the glass tube on the smoke side can be regularly washed through the washing port under the condition of not stopping the furnace. The air preheater can keep long-term stable operation by an online cleaning mode.

Claims

1. The utility model provides an online clean glass tubular ultra-low temperature discharges air heater which characterized in that, this air heater includes three big modules: the steel plate heat exchange module (1), the cast iron plate heat exchange module (2) and the glass tube type heat exchange module (3) are distributed from top to bottom; the high-temperature flue gas and the high-temperature air exchange heat at the steel plate heat exchange module section; the medium-temperature flue gas and the medium-temperature air exchange heat at a cast iron plate heat exchange module section; the heat exchange of the low-temperature section is carried out at the glass tube type heat exchange module section;

a flue gas bypass (5) is arranged between the cast iron plate heat exchange module (2) and the glass tube type heat exchange module (3), and a flue gas sealing valve (7) is arranged below the flue gas bypass (5); a bypass valve (6) is arranged on the flue gas bypass (5), and a direct vent valve (8) is arranged on the direct vent flue;

the upper and lower openings of the glass tube type heat exchange module (3) are provided with washing openings (9).

2. An on-line cleaning glass tube ultra-low temperature discharge air preheater as claimed in claim 1, wherein the flue gas bypass (5) leads directly to the induced draft fan (10).

3. An on-line cleaning glass tube ultra-low temperature discharge air preheater as claimed in claim 1, wherein the flue gas bypass (5) is introduced to the bottom of the glass tube heat exchange module (3).