CN217584383U - Exhaust-heat boiler safety device suitable for fluctuation of sulfur content in flue gas - Google Patents
Exhaust-heat boiler safety device suitable for fluctuation of sulfur content in flue gas Download PDFInfo
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- CN217584383U CN217584383U CN202221358348.4U CN202221358348U CN217584383U CN 217584383 U CN217584383 U CN 217584383U CN 202221358348 U CN202221358348 U CN 202221358348U CN 217584383 U CN217584383 U CN 217584383U
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Abstract
The utility model discloses a waste heat boiler safety device suitable for fluctuation of sulfur content in flue gas, which comprises a waste heat boiler, wherein the waste heat boiler comprises a boiler barrel, a flue, and an overheater, an evaporator, a high-temperature economizer and a low-temperature economizer which are arranged in the flue, a heat conduction oil heat exchanger which is arranged between the high-temperature economizer and the low-temperature economizer is arranged in the flue, the outlet of the heat conduction oil heat exchanger is connected with an oil collecting cylinder through a pipeline, and the inlet of the heat conduction oil heat exchanger is connected with an oil distributing cylinder through a pipeline; the oil distribution cylinder is connected with a gas hot oil furnace through a pipeline, the gas hot oil furnace is connected with the oil collection cylinder through a pipeline, and a circulating oil pump is arranged on the pipeline; and a bypass electric valve group is arranged between an inlet pipeline and an outlet pipeline of the heat-conducting oil heat exchanger and is controlled to be opened and closed by a DCS (distributed control system) main station arranged outside the waste heat boiler. The utility model aims at providing a can avoid flue gas temperature to be less than sulphur dew point, prevent that exhaust-heat boiler afterbody from taking place the safety device who corrodes.
Description
Technical Field
The utility model relates to a waste heat utilization technology field especially relates to a waste heat boiler safety device suitable for flue gas sulfur content is undulant.
Background
At present, in industrial fields such as petrochemical industry, metallurgy, copper smelting, steel, carbon and other industry flue gases, the high-sulfur condition generally exists, and when waste heat recovery is carried out on sulfur-containing flue gas in various industries, the waste heat recovery method often meets the following conditions: (1) The high-sulfur flue gas parameters are reduced, such as the flue gas flow is reduced, and the flue gas temperature is reduced; (2) In the original industrial process, raw materials and fuels are changed, for example, the sulfur content of the raw materials and the fuels in the original product production industry is increased.
The area of the heat exchange surface of the waste heat boiler is a fixed value after the waste heat boiler is designed and manufactured according to rated waste gas parameters. If the condition of (1) occurs, when the waste heat smoke flows through the waste heat boiler, the smoke temperature is reduced in the tail heat exchange surface area, and when the smoke temperature is lower than the sulfur dew point, the tail heat exchange surface of the waste heat boiler is easy to corrode. If the situation of the above (2) occurs, even if the flue gas temperature and the flue gas flow rate are not changed, the sulfur dew point of the heat exchange surface at the tail of the waste heat boiler is also increased due to the increase of the sulfur content, that is, the heated surface at the tail of the waste heat boiler can be subjected to sulfur corrosion at the original flue gas temperature. Therefore, a safety protection device capable of preventing the temperature of the flue gas from being lower than the dew point of sulfur and preventing the tail heat exchange surface of the waste heat boiler from being corroded is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the above-mentioned prior art, aim at providing one kind and can avoid the flue gas temperature to be less than sulphur dew point, prevent that exhaust-heat boiler afterbody heat transfer surface from taking place the safety device who corrodes.
In order to achieve the purpose, the utility model is realized by the following technical proposal:
a waste heat boiler safety protection device suitable for fluctuation of sulfur content of flue gas comprises a waste heat boiler, wherein the waste heat boiler comprises a boiler barrel, a flue, and a superheater, an evaporator, a high-temperature economizer and a low-temperature economizer which are arranged in the flue from an inlet to an outlet, a heat conduction oil heat exchanger is arranged in the flue and is positioned between the high-temperature economizer and the low-temperature economizer, the outlet of the heat conduction oil heat exchanger is connected with an oil collecting cylinder through a pipeline, and the inlet of the heat conduction oil heat exchanger is connected with an oil distributing cylinder through a pipeline; the oil distribution cylinder is connected with a gas hot oil furnace through a pipeline, the gas hot oil furnace is connected with the oil collection cylinder through a pipeline, and a circulating oil pump is arranged on the pipeline; and a bypass electric valve group is arranged between an inlet pipeline and an outlet pipeline of the heat-conducting oil heat exchanger and is controlled to be opened and closed by a DCS (distributed control system) main station arranged outside the waste heat boiler.
Furthermore, an adjusting oil pump is connected to a pipeline communicated with the gas hot oil furnace through a branch pipeline, the adjusting oil pump is connected with an oil storage device through a pipeline, the oil storage device comprises an oil storage tank, an oil injection pump and an expansion tank, and the oil storage tank is respectively communicated with the oil injection pump, the expansion tank and the adjusting oil pump through pipelines and forms pipeline circulation.
Further, a first temperature sensor is arranged between the high-temperature coal economizer and the heat conduction oil heat exchanger, a second temperature sensor is arranged between the heat conduction oil heat exchanger and the low-temperature coal economizer, and a third temperature sensor is arranged at an outlet of the flue.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a to arranging the improvement of exhaust-heat boiler afterbody economizer, can rise or when the exhaust-heat flue gas parameter reduces at exhaust-heat boiler flue gas sulfur content, through the temperature that improves the flue gas once more, make the flue gas temperature reach sulphur dew point, improve the anti sulphur corrosion capability of exhaust-heat boiler, ensure the operation of exhaust-heat boiler afterbody heating surface safety and stability.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Reference numerals:
1-a low-temperature economizer, 2-a high-temperature economizer, 3-an evaporator, 4-a superheater, 5-a drum, 6-a gas-fired hot oil furnace, 7-a branch oil cylinder, 8-a heat transfer oil exchanger, 9-an oil collecting cylinder, 10-a circulating oil pump, 11-a bypass electric valve set, 12-an oil storage tank, 13-a regulating oil pump, 14-an oil injection pump, 15-an expansion tank, 16-a DCS main station, 17-a flue, 18-a first temperature sensor, 19-a second temperature sensor, 20-a third temperature sensor, 171-a flue inlet and 172-a flue outlet.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, a waste heat boiler safety protection device suitable for fluctuation of sulfur content in flue gas comprises a waste heat boiler, wherein the waste heat boiler comprises a boiler barrel 5, a flue 17, and a superheater 4, an evaporator 3, a high-temperature economizer 2 and a low-temperature economizer 1 which are arranged in the flue 17 from an inlet to an outlet, a heat conduction oil heat exchanger 8 arranged between the high-temperature economizer 2 and the low-temperature economizer 1 is arranged in the flue 17, the outlet of the heat conduction oil heat exchanger 8 is connected with a collecting oil cylinder 9 through a pipeline, and the inlet of the heat conduction oil heat exchanger 8 is connected with a branch oil cylinder 7 through a pipeline; the branch oil cylinder 7 is connected with a gas hot oil furnace 6 through a pipeline, the gas hot oil furnace 6 is connected with an oil collecting cylinder 9 through a pipeline, and a circulating oil pump 10 is arranged on the pipeline; a bypass electric valve set 11 is arranged between an inlet pipeline and an outlet pipeline of the heat conducting oil heat exchanger 8, and the bypass electric valve set 11 is controlled to be opened and closed through a DCS (distributed control system) main station 16 arranged outside the waste heat boiler.
The pipeline of the circulating oil pump 10 communicated with the gas hot oil furnace 6 is connected with an adjusting oil pump 13 through a branch pipeline, the adjusting oil pump 13 is connected with an oil storage device through a pipeline, the oil storage device comprises an oil storage tank 12, an oil injection pump 14 and an expansion tank 15, and the oil storage tank 12 is respectively communicated with the oil injection pump 14, the expansion tank 15 and the adjusting oil pump 13 through pipelines to form pipeline circulation. The oil storage device is used for storing redundant heat conduction oil, and when the heat conduction oil in the gas hot oil furnace is insufficient, the adjusting oil pump 13 is started to pump out the heat conduction oil in the oil storage tank 12 to be supplemented into the gas hot oil furnace 6. The heat conducting oil in the oil storage tank 12 and the expansion tank 15 is provided with circulating power through the oil injection pump 14.
A first temperature sensor 18 is arranged between the high-temperature economizer 2 and the heat conduction oil heat exchanger 8, and the first temperature sensor 18 is used for measuring the temperature of flue gas at the inlet of the heat conduction oil heat exchanger 8; a second temperature sensor 19 is arranged between the heat-conducting oil heat exchanger 8 and the low-temperature economizer 1, and the second temperature sensor 19 is used for measuring the temperature of the flue gas at the outlet of the heat-conducting oil heat exchanger 8; a third temperature sensor 20 is arranged at the outlet of the flue 17, and the third temperature sensor 20 is used for measuring the smoke exhaust temperature of the flue outlet 172.
The principle of the waste heat boiler is as follows: after entering the waste heat boiler, the hot flue gas with certain temperature and certain waste heat exchanges heat with the heat exchange surface of the waste heat boiler, and the heat in the flue gas is transferred to the boiler for water supply through the heat exchange surface. Boiler feed water passes through the heat transfer surface, absorbs the heat in the flue gas, becomes high-temperature water, saturated steam, superheated steam from low temperature water gradually, and finally superheated steam of exhaust-heat boiler output is used for the electricity generation or provides industrial steam for the mill and uses. The heat exchange surfaces of the waste heat boiler are a low-temperature economizer 1, a high-temperature economizer 2, an evaporator 3 and a superheater 4, and the heat dissipation process of the flue gas sequentially passes through a flue inlet 171, the superheater 4, the evaporator 3, the high-temperature economizer 2 and the low-temperature economizer 1. After passing through the low-temperature economizer 1 and the high-temperature economizer 2, the boiler feed water is changed into high-temperature water or a steam-water mixture from low-temperature water, and the high-temperature water or the steam-water mixture is conveyed into the boiler barrel 5 from the outlet of the high-temperature economizer 2. If the steam-water mixture enters the drum 5, the steam-water mixture is subjected to steam-water separation in the large cavity of the drum 5 due to the large volume of the drum 5, the separated steam is gathered in the upper space in the drum 5, and the water is gathered in the lower space in the drum 5. The water in the lower space of the drum 5 is led out from the bottom of the drum 5, heated into saturated steam by the evaporator 3 and then returned into the drum 5. The steam collected in the upper space of the drum 5 is led out from the upper part of the drum 5 and is heated by the heater 4 to become superheated steam.
The utility model discloses a set up conduction oil heat exchanger 8 between high temperature economizer 2 and low temperature economizer 1, carry out the secondary heating to the flue gas after the heat dissipation in the flue 17, make the flue gas temperature reach sulphur dew point, improve exhaust-heat boiler anti sulphur corrosion ability, ensure exhaust-heat boiler afterbody heated surface safety and stability's operation. When the flue gas parameters are reduced, such as the temperature is reduced and is lower than the sulfur dew point, the heat conduction oil in the heat conduction oil heat exchanger 8 can increase the flue gas temperature to reach the sulfur dew point value. When the sulfur content in the flue gas is increased, namely the sulfur dew point is correspondingly increased, the heat conduction oil in the heat conduction oil heat exchanger 8 can increase the temperature of the flue gas again to reach the sulfur dew point value.
The utility model discloses a concrete control method as follows:
(1) For different main production processes, the sulfur content is different, the flue gas dew point is also different, and the safe flue outlet smoke exhaust temperature is determined according to the actual working condition. The temperature T1 measured by the first temperature sensor 18 is the inlet flue gas temperature of the heat transfer oil heat exchanger 8, the temperature T2 measured by the second temperature sensor 19 is the outlet flue gas temperature of the heat transfer oil heat exchanger 8, and the temperature T3 measured by the third temperature sensor 20 is the flue gas temperature at the flue outlet 172. For example, the highest sulfur content of the flue gas of a waste heat boiler of a carbon calcining furnace for aluminum can reach 6000mg/Nm 3 The calculated sulfur dew point temperature is about 140 ℃, the exhaust temperature of the waste heat boiler is usually set to be not lower than 180 ℃, and 180 ℃ is the safe exhaust temperature.
(2) When the temperature T2 of the flue gas at the outlet of the heat transfer oil heat exchanger 8 is lower than 180 ℃, that is, the temperature between the high-temperature economizer 2 and the low-temperature economizer 1 is lower than 180 ℃, the heat transfer oil heat exchanger 8 starts to operate.
(3) According to the numerical difference between the exhaust gas temperature T3 and the outlet gas temperature T2 of the heat-conducting oil heat exchanger 8, the opening degree of the bypass electric valve set 11 is calculated through the DCS main station 16, so that the flow of heat-conducting oil entering the heat-conducting oil heat exchanger 8 is adjusted, the temperature of the gas is increased to be higher than the dew point of sulfur, and the excessive loss of heat-conducting oil is avoided. The bypass electric valve set 11 is installed between the inlet pipeline and the outlet pipeline of the heat-conducting oil heat exchanger 8 through a bypass pipeline, and the inlet pipeline and the outlet pipeline are communicated, so that a bypass pipeline of heat-conducting oil is formed.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides a waste heat boiler safety device suitable for flue gas sulfur content is undulant, includes waste heat boiler, waste heat boiler includes drum (5), flue (17) to and by overheater (4), evaporimeter (3), high temperature economizer (2) and low temperature economizer (1) that the entry set up to the export in flue (17), its characterized in that: a heat conduction oil heat exchanger (8) positioned between the high-temperature economizer (2) and the low-temperature economizer (1) is arranged in the flue (17), the outlet of the heat conduction oil heat exchanger (8) is connected with an oil collecting cylinder (9) through a pipeline, and the inlet of the heat conduction oil heat exchanger (8) is connected with a branch oil cylinder (7) through a pipeline; the oil distribution cylinder (7) is connected with a gas hot oil furnace (6) through a pipeline, the gas hot oil furnace (6) is connected with the oil collection cylinder (9) through a pipeline, and a circulating oil pump (10) is arranged on the pipeline; a bypass electric valve set (11) is arranged between an inlet pipeline and an outlet pipeline of the heat-conducting oil heat exchanger (8), and the bypass electric valve set (11) is controlled to be opened and closed through a DCS (distributed control system) main station (16) arranged outside the waste heat boiler.
2. The waste heat boiler safety device suitable for the fluctuation of the sulfur content in the flue gas of claim 1, wherein: the gas hot oil furnace is characterized in that an adjusting oil pump (13) is connected to a pipeline communicated with the gas hot oil furnace (6) through a branch pipeline, the adjusting oil pump (13) is connected with an oil storage device through a pipeline, the oil storage device comprises an oil storage tank (12), an oil injection pump (14) and an expansion tank (15), and the oil storage tank (12) is respectively communicated with the oil injection pump (14), the expansion tank (15) and the adjusting oil pump (13) through pipelines and constitutes pipeline circulation.
3. The waste heat boiler safety device suitable for the fluctuation of the sulfur content in the flue gas of claim 1, wherein: a first temperature sensor (18) is arranged between the high-temperature economizer (2) and the heat conduction oil heat exchanger (8), a second temperature sensor (19) is arranged between the heat conduction oil heat exchanger (8) and the low-temperature economizer (1), and a third temperature sensor (20) is arranged at an outlet of the flue (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221358348.4U CN217584383U (en) | 2022-05-26 | 2022-05-26 | Exhaust-heat boiler safety device suitable for fluctuation of sulfur content in flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221358348.4U CN217584383U (en) | 2022-05-26 | 2022-05-26 | Exhaust-heat boiler safety device suitable for fluctuation of sulfur content in flue gas |
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| Publication Number | Publication Date |
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| CN217584383U true CN217584383U (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221358348.4U Active CN217584383U (en) | 2022-05-26 | 2022-05-26 | Exhaust-heat boiler safety device suitable for fluctuation of sulfur content in flue gas |
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| CN (1) | CN217584383U (en) |
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2022
- 2022-05-26 CN CN202221358348.4U patent/CN217584383U/en active Active
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