Flue gas waste heat boiler suitable for carbon fiber waste gas waste heat utilization

Abstract

The utility model relates to a flue gas waste heat boiler suitable for carbon fiber waste gas waste heat utilization, which is characterized in that the middle of each boiler tube box is fixedly welded with a steel frame, guide plates are arranged on two sides of the other boiler tube boxes, a boiler barrel is arranged at the top of the steel frame, and a plurality of evaporation areas and coal economizers are sequentially arranged in the boiler tube boxes. A flue inlet and an inlet expansion joint are sequentially arranged at the front end of the boiler tube box, flue gas sequentially flows through an evaporation area and a coal economizer, a flue gas outlet is formed in the tail end of the coal economizer and communicated with an induced draft fan, and the coal economizer is communicated with a water feeding pump and communicated with a boiler barrel through a coal economizer outlet pipeline. The boiler barrel is respectively communicated with the tube bundle of each evaporation area through a descending pipeline and an ascending pipeline, saturated water in the boiler barrel is fed into the tube bundle of each evaporation area through the descending pipeline, and a steam-water mixture heated by flue gas in the tube bundle of each evaporation area is fed into the boiler barrel through the ascending pipeline for circulation. Energy waste and environmental pollution are avoided, and natural circulation is adopted.

Description

Technical Field

[0001] The utility model relates to a flue gas waste heat boiler suitable for utilizing waste heat of carbon fiber waste gas. Background Art

[0002] In the carbon fiber process, the temperature of high and low carbon waste gases can reach about 900℃ after passing through the incinerator. The dust content is large and the tube bundles are easy to stick to ash. If these flue gases are discharged directly, it will not only waste energy but also pollute the environment. In addition, improper discharge will also pose a safety hazard. If this part of the high-temperature flue gas is recovered through a waste heat boiler, the flue gas temperature can be reduced to 200℃ and saturated steam at about 165℃ can be produced. The saturated steam at about 165℃ can be used for production steam in the factory or heating steam in winter. Utility Model Content

[0003] The utility model provides a flue gas waste heat boiler suitable for utilizing waste heat of carbon fiber exhaust gas, which reduces exhaust temperature, avoids energy waste and environmental pollution, adopts natural circulation, has reliable system operation, and is easy to operate and maintain.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas, characterized in that: the middle of the boiler pipe box is welded and fixed to the steel frame, guide plates are arranged on both sides of the remaining boiler pipe box, a boiler drum is arranged on the top of the steel frame, and a platform escalator is arranged on the steel frame;

[0006] Several evaporation zones and economizers are sequentially arranged in the boiler tube box, and a flue inlet and an inlet expansion joint are sequentially arranged at the front end of the boiler tube box for flue gas to enter, and the flue gas sequentially flows through the evaporation zone and the economizer for heat exchange, and the tail end of the economizer is a flue gas outlet, which is connected to the induced draft fan for flue gas to be discharged;

[0007] The economizer is connected to a feed water pump, and the economizer is connected to the boiler drum through an economizer outlet pipeline, so that the feed water heated to an undersaturated water temperature in the economizer is sent to the boiler drum, and the boiler drum is respectively connected to the tube bundle of each evaporation zone through a downcomer and an upcomer, and the saturated water in the boiler drum is sent to the tube bundle of each evaporation zone through the downcomer, and the steam-water mixture heated by flue gas in the tube bundle of the evaporation zone is sent to the boiler drum through the upcomer for circulation, and the saturated steam in the boiler drum is sent to the pipeline network for use in subsequent processes.

[0008] The flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas, wherein: the evaporation zone includes a first evaporation zone, a second evaporation zone, a third evaporation zone, a fourth evaporation zone and a fifth evaporation zone, and each of the evaporation zones and the economizer is respectively provided with a soot blower and a soot cleaning door for cleaning dust.

[0009] The flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas, wherein: expansion joints are respectively arranged at both ends of the boiler pipe box, and the boiler pipe box can expand freely from the middle to both ends.

[0010] The flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas, wherein: the tube bundle in the evaporation zone adopts an upper supported lantern tube structure and can expand downward.

[0011] The flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas, wherein: the economizer adopts a top-suspended serpentine tube structure that can expand downward.

[0012] The flue gas waste heat boiler suitable for utilizing the waste heat of carbon fiber exhaust gas, wherein: a smoke barrier wall is arranged in the boiler pipe box to avoid the formation of a flue gas corridor and thus the decrease of the flue gas heat transfer effect.

[0013] Beneficial effects of the utility model:

[0014] 1. Reduce the exhaust temperature, avoiding energy waste and environmental pollution;

[0015] 2. Adopting natural circulation, the system runs reliably and is easy to operate and maintain.

[0016] 3. The tube bundle in the evaporation zone adopts an upper supported vertical lantern tube structure, and the economizer adopts a top suspended serpentine tube structure. The tube bundle and serpentine tube can expand freely downward.

[0017] 4. A fixed rotary soot blower is installed between each heating surface tube box. Regular soot blowing can effectively remove the accumulated soot on the heating surface.

[0018] 5. An internal insulation pipe box structure is set up inside to facilitate transportation and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas.

[0020] Figure 2 It is a top view of the structure of a flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas.

[0021] Figure 3 It is the AA cross-sectional structural diagram of the flue gas waste heat boiler suitable for utilizing the waste heat of carbon fiber exhaust gas.

[0022] Explanation of the reference numerals: 1-boiler drum; 2-first evaporation zone; 3-second evaporation zone; 4-third evaporation zone; 5-fourth evaporation zone; 6-fifth evaporation zone; 7-economizer; 8-down pipe; 9-steel frame; 10-platform escalator; 11-flue inlet; 12-inlet expansion joint; 13-soot blower; 14-economizer outlet pipe; 15-ascending pipe; 16-ash cleaning door. DETAILED DESCRIPTION

[0023] like Figures 1 to 3 A flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas is shown, which is characterized in that the middle of the boiler pipe box is welded and fixed to a steel frame 9, guide plates are arranged on both sides of the remaining boiler pipe box, a boiler drum 1 is arranged on the top of the steel frame 9, and a platform escalator 10 is arranged on the steel frame 9.

[0024] A smoke barrier 17 is arranged in the boiler tube box to avoid the formation of a smoke corridor which may lead to a decrease in the heat transfer effect of the smoke. A number of evaporation zones and economizers 7 are arranged in sequence in the boiler tube box. The evaporation zones include a first evaporation zone 2, a second evaporation zone 3, a third evaporation zone 4, a fourth evaporation zone 5 and a fifth evaporation zone 6. The tube bundles in the evaporation zones adopt an upper supported lantern tube structure which can expand downward. The economizer 7 adopts a top suspended serpentine tube structure which can expand downward. Soot blowing is respectively arranged on each of the evaporation zones and the economizer 7. The soot blower 13 and the cleaning door 16, the soot blower 13 blows soot regularly to effectively remove the accumulated ash on the heating surface, the cleaning door 16 facilitates the manual cleaning of the blown dust, the front end of the boiler pipe box is provided with a flue inlet 11 and an inlet expansion joint 12 in sequence for the flue gas to enter, the flue gas flows through the evaporation zone and the economizer 7 in sequence for heat exchange, expansion joints are provided at both ends of the boiler pipe box, the boiler pipe box can expand freely from the middle to both ends, the tail end of the economizer 7 is the flue gas outlet, and is connected to the induced draft fan for the flue gas to be discharged.

[0025] The economizer 7 is connected with the feed water pump, and the economizer 7 is connected with the boiler drum 1 through the economizer outlet pipeline 14, so that the feed water heated to the undersaturated water temperature in the economizer 7 is sent to the boiler drum 1, and the boiler drum 1 is respectively connected with the tube bundle of each evaporation zone through the downcomer 8 and the upcomer 15. The saturated water in the boiler drum 1 is sent to the tube bundle of each evaporation zone through the downcomer 8, and the steam-water mixture heated by the flue gas in the tube bundle of the evaporation zone is sent to the boiler drum 1 through the upcomer 15 for circulation, and the saturated steam in the boiler drum 1 is sent to the pipeline network for use in subsequent processes.

[0026] In the embodiment, the high-temperature flue gas enters the boiler tube box through the inlet expansion joint 12 and the flue inlet 11, and passes through the first evaporation zone 2, the second evaporation zone 3, the third evaporation zone 4, the fourth evaporation zone 5, the fifth evaporation zone 6 and the economizer 7 in sequence. The water supply pump is started to send water into the economizer 7. After being heated to the undersaturated water temperature, the water is sent into the boiler drum 1 through the economizer outlet pipeline 14. The saturated water in the boiler drum 1 is sent into the tube bundles of each evaporation zone through the downcomer 8 respectively. After heat exchange with the high-temperature flue gas flowing through, the steam-water mixture in the tube bundles of each evaporation zone flows back to the boiler drum 1 through the upcomer 15, and the saturated steam after primary separation and secondary separation is sent to the pipeline network.

[0027] The above description is only illustrative and not restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, but all will fall within the scope of protection of the present invention.

Claims

1. A flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas, characterized in that: The middle part of the boiler tube box is welded and fixed to the steel frame (9), and guide plates are arranged on both sides of the remaining boiler tube box. A boiler drum (1) is arranged on the top of the steel frame (9), and a platform ladder (10) is arranged on the steel frame (9); A plurality of evaporation zones and economizers (7) are sequentially arranged in the boiler tube box, a flue inlet (11) and an inlet expansion joint (12) are sequentially arranged at the front end of the boiler tube box for flue gas to enter, and the flue gas sequentially flows through the evaporation zones and the economizers (7) for heat exchange, and the tail end of the economizer (7) is a flue gas outlet and is connected to an induced draft fan for flue gas to be discharged; The economizer (7) is connected to a feed water pump. The economizer (7) is connected to the boiler drum (1) through an economizer outlet pipeline (14). The feed water heated to an undersaturated water temperature in the economizer (7) is sent to the boiler drum (1). The boiler drum (1) is respectively connected to the tube bundle of each evaporation zone through a downcomer (8) and an upcomer (15). The saturated water in the boiler drum (1) is sent to the tube bundle of each evaporation zone through the downcomer (8). The steam-water mixture heated by flue gas in the tube bundle of the evaporation zone is sent to the boiler drum (1) through the upcomer (15) for circulation. The saturated steam in the boiler drum (1) is sent to the pipeline network for use in subsequent processes.

2. A flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas as claimed in claim 1, characterized in that: The evaporation zone comprises a first evaporation zone (2), a second evaporation zone (3), a third evaporation zone (4), a fourth evaporation zone (5) and a fifth evaporation zone (6). A soot blower (13) and a soot cleaning door (16) are respectively provided on each of the evaporation zones and the economizer (7) for cleaning dust.

3. A flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas as claimed in claim 1, characterized in that: Expansion joints are respectively arranged at both ends of the boiler tube box, and the boiler tube box can expand freely from the middle to both ends.

4. A flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas as claimed in claim 1, characterized in that: The tube bundle in the evaporation zone adopts an upper-supported lantern tube structure and can expand downward.

5. A flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas as claimed in claim 1, characterized in that: The economizer (7) has a top-suspended serpentine tube structure that can expand downward.

6. A flue gas waste heat boiler suitable for utilizing waste heat from carbon fiber exhaust gas as claimed in claim 1, characterized in that: A smoke barrier wall (17) is arranged inside the boiler tube box to avoid the formation of a smoke corridor, thereby preventing the smoke heat transfer effect from being reduced.

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