CN211575070U - Vertical double pressure fire tube boiler - Google Patents
Vertical double pressure fire tube boiler Download PDFInfo
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- CN211575070U CN211575070U CN201922088654.5U CN201922088654U CN211575070U CN 211575070 U CN211575070 U CN 211575070U CN 201922088654 U CN201922088654 U CN 201922088654U CN 211575070 U CN211575070 U CN 211575070U
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Abstract
The utility model discloses a vertical two pressure firetube boilers, include: the flue gas inlet is formed in the inlet smoke box, and the flue gas outlet is formed in the outlet smoke box; a first ascending pipe and a first descending pipe are arranged between the fire-tube type medium-pressure evaporator and the medium-pressure steam drum, a second ascending pipe and a second descending pipe are arranged between the fire-tube type low-pressure evaporator and the low-pressure steam drum, a deoxidizing head is arranged on the low-pressure steam drum, an external water supply pipe is communicated with the deoxidizing head used for removing oxygen in water, a conveying pipe with a pump is arranged on the low-pressure steam drum, and the conveying pipe is communicated with the medium-pressure steam drum. The utility model has the advantages that: the low-pressure steam pocket is also used as a deaerating device of the whole boiler, so that the manufacturing cost of the boiler is reduced; the heat exchange effect is greatly improved, and the high-temperature flue gas can be effectively reduced to below 200 ℃; the water vapor of the whole boiler completely realizes natural circulation, and the use cost of the boiler is greatly reduced.
Description
Technical Field
The utility model relates to a firetube boiler technical field.
Background
The high-temperature flue gas in the iron-making blast furnace sequentially passes through the vaporization cooling and the cyclone separator, and the flue gas discharged by the cyclone separator has the characteristics of large flue gas quantity, high flue gas temperature which can reach over 1000 ℃. At present, flue gas discharged by a cyclone separator is subjected to flue gas cooling treatment by a medium-pressure boiler, but the traditional medium-pressure boiler cannot reduce the temperature of the flue gas to below 200 ℃, so that a large amount of flue gas heat loss is caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve is: the vertical natural circulation double-pressure fire tube boiler has a good heat exchange effect.
In order to solve the above problem, the utility model adopts the following technical scheme: the vertical double-pressure fire tube boiler comprises an inlet smoke box, a fire tube type medium-pressure evaporator, a transition smoke box, a fire tube type low-pressure evaporator and an outlet smoke box which are sequentially arranged from top to bottom, wherein the inlet smoke box is communicated with the upper end of a tube side of the fire tube type medium-pressure evaporator; a plurality of first ascending pipes and first descending pipes are arranged between the shell pass of the fire-tube type medium-pressure evaporator and the medium-pressure steam pocket, a plurality of second ascending pipes and second descending pipes are arranged between the shell pass of the fire-tube type low-pressure evaporator and the low-pressure steam pocket, a deoxidizing head is arranged on the low-pressure steam pocket, an external water supply pipe used for conveying demineralized water is communicated with the deoxidizing head used for removing oxygen in water, a conveying pipe with a pump is arranged on the low-pressure steam pocket, the conveying pipe with the pump is communicated with the medium-pressure steam pocket, and water with oxygen removed in the low-pressure steam pocket is conveyed into the medium-pressure steam pocket through the conveying pipe.
Further, in the vertical double-pressure fire tube boiler, the low-pressure steam drum is arranged above the fire tube type low-pressure evaporator, and the fall between the elevation of the low-pressure steam drum and the highest point of the fire tube type low-pressure evaporator is greater than 10 meters; the medium-pressure steam pocket is arranged above the fire tube type medium-pressure evaporator, and the fall between the elevation of the medium-pressure steam pocket and the highest point of the fire tube type medium-pressure evaporator is more than 10 meters.
Further, the vertical type dual pressure fire tube boiler comprises a first falling tube between the shell side of the fire tube type medium pressure evaporator and the medium pressure steam drum, and the first falling tube is structured as follows: and the first main downcomer is connected with a plurality of first branch downcomers, and the first branch downcomers are communicated with the shell side of the fire tube type medium pressure evaporator.
Further, in the vertical type double-pressure fire tube boiler, the steam output pipe on the medium-pressure steam pocket is connected with the steam output branch pipe, and the steam output branch pipe is communicated with the oxygen removal head.
Further, in the vertical type dual pressure fire tube boiler, an ash discharge port is formed at the bottom of the outlet smoke box.
Further, in the vertical type dual pressure fire tube boiler, the flue gas inlet is arranged at the top of the inlet smoke box, and the flue gas outlet is arranged at one side of the outlet smoke box.
Further, the vertical type double-pressure fire tube boiler is characterized in that a frame is arranged outside the whole boiler, and the whole boiler is supported on a cross beam of the frame.
The utility model has the advantages that: firstly, the low-pressure steam pocket with the oxygen removal head is used as the oxygen removal device of the whole boiler, so that the boiler does not need to be additionally provided with the oxygen removal device, the structure of the whole boiler is simplified, and the manufacturing cost of the boiler is effectively controlled. Secondly, an inlet smoke box, a fire tube type medium-pressure evaporator, a transition smoke box, a fire tube type low-pressure evaporator and an outlet smoke box of the boiler are arranged in a tower shape from top to bottom, the arrangement structure of the whole boiler is optimized, and the structure is reasonable; adopt fire tube formula middling pressure evaporimeter and fire tube formula low pressure evaporimeter to carry out heat recovery to high temperature flue gas, the flue gas is current in the tube side, and heat transfer effect and heat exchange efficiency obtain improving greatly to can fully absorb the heat in the high temperature flue gas, effectively reduce the exit temperature of high temperature flue gas to the temperature of settlement, below 200 ℃. And thirdly, the setting heights of the medium-pressure steam drum and the low-pressure steam drum enable the water vapor of the whole boiler to form natural circulation, and no power equipment is additionally arranged, so that the use cost of the whole boiler is effectively reduced, the pipeline structure is effectively simplified, and the whole boiler is more compact.
Drawings
Fig. 1 is a schematic view of the working principle of the vertical dual pressure fire tube boiler of the present invention.
Fig. 2 is a schematic view of the installation structure of the vertical dual pressure fire tube boiler of the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and preferred embodiments.
As shown in fig. 1 and 2, the vertical dual-pressure fire tube boiler comprises an inlet smoke box 1, a fire tube type medium-pressure evaporator 2, a transition smoke box 3, a fire tube type low-pressure evaporator 4 and an outlet smoke box 5 which are arranged in sequence from top to bottom. The upper end intercommunication of entry smoke box 1 and 2 tube sides of fire tube formula middling pressure evaporimeter, the lower extreme and the transition smoke box 3 intercommunication of 2 tube sides of fire tube formula middling pressure evaporimeter, the bottom of transition smoke box 3 is linked together with the upper end of 4 tube sides of fire tube formula low pressure evaporimeter, and the lower extreme and the export smoke box 5 of 4 tube sides of fire tube formula low pressure evaporimeter are linked together. The inlet smoke box 1 is provided with a smoke inlet 11, and the smoke inlet 11 is arranged at the top of the inlet smoke box 1 in the embodiment; the outlet smoke box 5 is provided with a smoke outlet 51, the smoke outlet 51 is arranged on one side of the outlet smoke box 5 in the embodiment, and the bottom of the outlet smoke box 5 is provided with an ash discharging port 52 for facilitating periodic ash discharging.
A plurality of first ascending pipes 61 and a plurality of first descending pipes 62 are arranged between the shell side of the fire-tube type medium-pressure evaporator 2 and the medium-pressure steam pocket 6, and a plurality of second ascending pipes 71 and a plurality of second descending pipes 72 are arranged between the shell side of the fire-tube type low-pressure evaporator 4 and the low-pressure steam pocket 7. In order to simplify the structure, the first downcomer 62 between the shell side of the fired-tube medium-pressure evaporator 2 and the medium-pressure drum 6 has a structure comprising: the first total downcomer 621 is connected with the medium-pressure steam drum 6, the first total downcomer 621 is connected with a plurality of first branch downcomers 622, the first branch downcomers 622 are communicated with the shell side of the fire-tube type medium-pressure evaporator 2, and the number of the first branch downcomers 622 is three. The first total downcomer 621 is adopted, so that the pipeline structure between the shell side of the fire tube type medium-pressure evaporator 2 and the medium-pressure steam drum 6 can be greatly simplified, and the first total downcomer 621 is communicated with the medium-pressure steam drum 6 through the three first branch downcomers 622, so that uniform water inlet in the medium-pressure steam drum 6 can be effectively ensured.
The low-pressure steam pocket 7 is provided with an oxygen removing head 8 for removing oxygen in water, and an external water supply pipe 9 for conveying demineralized water is communicated with the oxygen removing head 8. The low-pressure steam pocket 7 is provided with a delivery pipe 73 with a pump, the delivery pipe 73 with the pump is communicated with the medium-pressure steam pocket 6, and the steam water without oxygen in the low-pressure steam pocket 7 is delivered to the medium-pressure steam pocket 6 through the delivery pipe 73. The steam output pipe 63 on the medium-pressure steam pocket 6 is connected with a steam output branch pipe 631, and the steam output branch pipe 631 is communicated with the oxygen removing head 8. The water with oxygen removed in the low-pressure steam drum 6 is sent to the medium-pressure steam drum 6 again, so that the medium-pressure steam drum 6 and the whole boiler system do not need to be additionally provided with an oxygen removing device, and the manufacturing cost of the boiler is effectively saved. A part of the medium pressure steam exiting the medium pressure steam drum 6 is fed via the steam outlet branch 631 to the oxygen removal head 8 as steam for oxygen removal, so that the oxygen removal head 8 can effectively remove oxygen from the brine.
In order to realize the natural circulation of water vapor in the whole boiler, in the implementation, the low-pressure steam pocket 7 is arranged above the fire tube type low-pressure evaporator 4, and the fall between the elevation of the low-pressure steam pocket 7 and the highest point of the fire tube type low-pressure evaporator 4 is more than 10 meters; the medium-pressure steam pocket 6 is arranged above the fire tube type high-pressure evaporator 2, and the fall between the elevation of the medium-pressure steam pocket 6 and the highest point of the fire tube type medium-pressure evaporator 2 is more than 10 meters. In this embodiment, the entire boiler is supported on a beam 10, said beam 10 being fixed to a frame 20.
Flue gas flow: high-temperature flue gas enters the inlet smoke box 1 from the flue gas inlet 11, the high-temperature flue gas in the inlet smoke box 1 enters the tube pass of the fire tube type medium-pressure evaporator 2, the flue gas in the tube pass of the fire tube type medium-pressure evaporator 2 enters the transition smoke box 3, the flue gas in the transition smoke box 3 enters the tube pass of the fire tube type low-pressure evaporator 4 again, and the flue gas releasing heat is discharged to the subsequent washing through the flue gas outlet 51 of the outlet smoke box 5.
A water vapor flow: demineralized water enters the oxygen removal head 8 through the external water supply pipe 9, demineralized water with oxygen removed in the oxygen removal head 8 enters the low-pressure steam pocket 7, one part of water in the low-pressure steam pocket 7 is conveyed into the medium-pressure steam pocket 6 from the conveying pipe 73 under the action of a pump, the other part of water enters the shell pass of the fire-tube type low-pressure evaporator 4 through the second descending pipe 72, steam generated by heating in the shell pass of the fire-tube type low-pressure evaporator 4 enters the low-pressure steam pocket 7 through the second ascending pipe 71, and low-pressure steam generated by separation in the low-pressure steam pocket 7 is conveyed to a low-pressure steam pipe network. And the water vapor between the low-pressure steam pocket 7 and the shell pass of the fire tube type low-pressure evaporator 4 naturally circulates.
The water in the medium-pressure steam pocket 6 enters the shell pass of the fire-tube type medium-pressure evaporator 2 through the first total descending pipe 621 and the three first branch descending pipes 622 in sequence, steam generated by heating in the shell pass of the fire-tube type medium-pressure evaporator 2 enters the medium-pressure steam pocket 6 through the first ascending pipe 61, one part of medium-pressure steam generated by separation in the medium-pressure steam pocket 6 is conveyed to a medium-pressure steam pipe network, and the other part of medium-pressure steam generated by separation in the medium-pressure steam pocket 6 is conveyed to the oxygen removal head 8 to be used as oxygen removal steam. And the water vapor naturally circulates between the medium-pressure low-pressure heat exchanger 6 and the shell side of the fire tube type medium-pressure evaporator 2.
The utility model has the advantages that: firstly, the low-pressure steam pocket 7 with the oxygen removal head 8 is used as the oxygen removal device of the medium-pressure steam pocket 6 and the whole boiler system, and the oxygen removal device is not needed to be additionally arranged on the medium-pressure steam pocket 6 and the whole boiler system, so that the structure of the whole boiler is simplified, and the manufacturing cost of the boiler is effectively controlled. Secondly, adopt fire tube formula middling pressure evaporimeter 2 and fire tube formula low pressure evaporimeter 4 to carry out heat recovery to the high temperature flue gas, the flue gas is current in the tube side, and heat transfer effect and heat exchange efficiency obtain improving greatly. And thirdly, the arrangement heights of the medium-pressure steam drum 6 and the low-pressure steam drum 7 enable the water vapor of the whole boiler to be completely and naturally circulated, and no power equipment is additionally arranged, so that the use cost of the whole boiler is effectively reduced, the pipeline structure is effectively simplified, and the whole boiler is more compact.
Claims (7)
1. Vertical two pressure firetube boilers which characterized in that: the device comprises an inlet smoke box, a fire tube type medium-pressure evaporator, a transition smoke box, a fire tube type low-pressure evaporator and an outlet smoke box which are sequentially arranged from top to bottom, wherein the inlet smoke box is communicated with the upper end of a tube pass of the fire tube type medium-pressure evaporator, the lower end of the tube pass of the fire tube type medium-pressure evaporator is communicated with the transition smoke box, the bottom of the transition smoke box is communicated with the upper end of the tube pass of the fire tube type low-pressure evaporator, the lower end of the tube pass of the fire tube type low-pressure evaporator is communicated with the outlet smoke box, a smoke inlet is formed in the inlet smoke box, and a smoke outlet; a plurality of first ascending pipes and first descending pipes are arranged between the shell pass of the fire-tube type medium-pressure evaporator and the medium-pressure steam pocket, a plurality of second ascending pipes and second descending pipes are arranged between the shell pass of the fire-tube type low-pressure evaporator and the low-pressure steam pocket, a deoxidizing head is arranged on the low-pressure steam pocket, an external water supply pipe used for conveying demineralized water is communicated with the deoxidizing head used for removing oxygen in water, a conveying pipe with a pump is arranged on the low-pressure steam pocket, the conveying pipe with the pump is communicated with the medium-pressure steam pocket, and water with oxygen removed in the low-pressure steam pocket is conveyed into the medium-pressure steam pocket through the conveying pipe.
2. A vertical dual pressure fire tube boiler according to claim 1, characterized in that: the low-pressure steam pocket is arranged above the fire tube type low-pressure evaporator, and the fall between the elevation of the low-pressure steam pocket and the highest point of the fire tube type low-pressure evaporator is more than 10 meters; the medium-pressure steam pocket is arranged above the fire tube type medium-pressure evaporator, and the fall between the elevation of the medium-pressure steam pocket and the highest point of the fire tube type medium-pressure evaporator is more than 10 meters.
3. A vertical dual pressure fire tube boiler according to claim 1 or 2, characterized in that: the structure of the first descending pipe between the shell side of the fire-pipe type medium-pressure evaporator and the medium-pressure steam drum comprises: and the first main downcomer is connected with a plurality of first branch downcomers, and the first branch downcomers are communicated with the shell side of the fire tube type medium pressure evaporator.
4. A vertical dual pressure fire tube boiler according to claim 1 or 2, characterized in that: the steam output pipe on the medium-pressure steam pocket is connected with a steam output branch pipe, and the steam output branch pipe is communicated with the deoxygenation head.
5. A vertical dual pressure fire tube boiler according to claim 1 or 2, characterized in that: the bottom of the outlet smoke box is provided with an ash discharge port.
6. A vertical dual pressure fire tube boiler according to claim 1 or 2, characterized in that: the flue gas inlet is arranged at the top of the inlet smoke box, and the flue gas outlet is arranged on one side of the outlet smoke box.
7. A vertical dual pressure fire tube boiler according to claim 1 or 2, characterized in that: the whole boiler is externally provided with a frame, and the whole boiler is supported on a cross beam of the frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922088654.5U CN211575070U (en) | 2019-11-28 | 2019-11-28 | Vertical double pressure fire tube boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922088654.5U CN211575070U (en) | 2019-11-28 | 2019-11-28 | Vertical double pressure fire tube boiler |
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| CN211575070U true CN211575070U (en) | 2020-09-25 |
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| CN201922088654.5U Active CN211575070U (en) | 2019-11-28 | 2019-11-28 | Vertical double pressure fire tube boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925725A (en) * | 2019-11-28 | 2020-03-27 | 苏州海陆重工股份有限公司 | Vertical double pressure fire tube boiler |
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- 2019-11-28 CN CN201922088654.5U patent/CN211575070U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925725A (en) * | 2019-11-28 | 2020-03-27 | 苏州海陆重工股份有限公司 | Vertical double pressure fire tube boiler |
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