CN102303848B - Method for exchanging heat between high-temperature process gas and low-temperature process gas in acid production process - Google Patents
Method for exchanging heat between high-temperature process gas and low-temperature process gas in acid production process Download PDFInfo
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- CN102303848B CN102303848B CN2011100851113A CN201110085111A CN102303848B CN 102303848 B CN102303848 B CN 102303848B CN 2011100851113 A CN2011100851113 A CN 2011100851113A CN 201110085111 A CN201110085111 A CN 201110085111A CN 102303848 B CN102303848 B CN 102303848B
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Abstract
The invention relates to a method for exchanging heat between a high-temperature process gas and a low-temperature process gas in an acid production process. The method comprises the following steps: charging the high-temperature process gas from the top of a heat exchange device and allowing the high-temperature process gas to pass through an upper catalyst bed layer, an inter-bed cooler, a lower catalyst bed layer and a process gas cooler, wherein in the catalyst bed layer, the high-temperature process gas is converted and release heat; in the inter-bed cooler and the process cooler, the high-temperature process gas and the low-temperature process gas undergo twice heat exchange; and the low-temperature process gas undergoing heat exchange in the process cooler enters the inter-bed cooler from a process gas connecting pipe, undergoes another time of temperature rise by heat exchange with the high-temperature process gas in the inter-bed cooler and flows out from a low-temperature process outlet. The invention has the advantages that: the high-temperature process gas and heat released in a conversion reaction are recovered effectively; the lower-temperature process gas is heated fully; and the heat exchange method greatly simplifies a process, saves floor area and equipment investment, and reduces energy consumption compared with the conventional indirect heat exchange method which adopts finned tube exchanger fused salt or overheated vapor.
Description
Technical field
The present invention relates to the method for heat recuperation in the sulfuric acid apparatus convertor, be specifically related to the method that pyroprocess gas and chilling process gas directly carry out heat exchange in a kind of relieving haperacidity process.
Background technology
The method that existing sulfuric acid device for making reclaims heat is: pyroprocess gas and chilling process gas adopt the mode of indirect heat exchange, adopt finned tube heat exchanger, adopt fused salt or superheated vapour, process for cooling gas in the Tube Sheet of Heat Exchanger, after taking reaction heat away, remove the front Process Gas of thermal conversion.The subject matter that faces is the fintube cooler bulky, and finned tube quantity is many, and at the scene installation, and bend part welding difficulty cause weldquality can not be guaranteed, and affect the use of equipment.Also need the setting up procedure hot-air heater, fused salt or steam system are complicated.
Summary of the invention
The heat-exchange method that the purpose of this invention is to provide pyroprocess gas and chilling process gas in a kind of relieving haperacidity process, the method adopts the pyroprocess gas direct heating chilling process gas in the conversion reaction, carry out gas-gas direct heat exchange, simplified technique, take up an area and lack, reduced facility investment and calorific loss.
For achieving the above object, the present invention is achieved through the following technical solutions:
The heat-exchange method of pyroprocess gas and chilling process gas in a kind of relieving haperacidity process, the method utilization makes pyroprocess gas and chilling process gas carry out gas and gas direct heat exchange through the pyroprocess gas direct heating chilling process gas that beds transforms.
Pyroprocess gas successively enters water cooler between bed, next section beds, Process Gas water cooler from the preceding paragraph beds, in beds pyroprocess gas and catalyzer generation conversion reaction, emits heat; Pyroprocess gas and chilling process gas carry out twice heat exchange in water cooler and the Process Gas water cooler between bed, heating chilling process gas; Chilling process gas through the heat exchange of process Gas Cooler enters water cooler between bed through the Process Gas pipe connecting, after water cooler between bed heats up with the heat exchange of pyroprocess gas again, is flowed out by the outlet of chilling process gas.
Concrete steps are as follows:
1) device that adopts is tube structure, be followed successively by water cooler, next section convertor, Process Gas water cooler between the preceding paragraph convertor, bed from top to bottom, be provided with beds in the preceding paragraph convertor and next section convertor, water cooler is connected by the Process Gas pipe connecting with the Process Gas water cooler between bed; Water cooler and Process Gas water cooler middle part are provided with the inner tube structure that pyroprocess gas passes through between described bed; Space between inner core and the outside cylindrical shell is chilling process gas passage; The outer wall of Process Gas water cooler is provided with the import of chilling process gas, and the outer wall of water cooler is provided with the outlet of chilling process gas between bed;
2) pyroprocess gas is entered by the pyroprocess gas entrance at device top, in the preceding paragraph convertor, carry out conversion reaction with catalyzer, then enter water cooler between bed, the chilling process gas of pyroprocess gas and inner core outside carries out heat exchange in the water cooler inner core between bed; Then enter in next section convertor and again carry out conversion reaction with catalyzer, enter the Process Gas water cooler after the conversion reaction, the chilling process gas with the inner core outside in Process Gas water cooler inner core carries out heat exchange, is flowed out by the outlet of pyroprocess gas at last;
3) the chilling process gas through the heat exchange of process Gas Cooler enters water cooler between bed through the Process Gas pipe connecting, water cooler between bed again with the heat exchange of pyroprocess gas after, flowed out by chilling process gas outlet.
The heat exchange element of water cooler and Process Gas water cooler adopts heat pipe between described bed, and heat pipe is obliquely installed, and heat pipe one end is positioned at inner core, and the other end is positioned at the inner core outside, and an end that is positioned at inner core is lower than an end of inner core outside.
Described heat pipe outside is provided with fin structure.
Compared with prior art, the invention has the beneficial effects as follows:
1) flow process is short, takes up an area to lack reduced investment.Power-equipment is few, and power consumption is few, and working cost is low, and operation is economical, is easy to attending device, and equipment is easy for installation, compact construction, and process system is simple.
2) employing participates in the chilling process gas heat exchange that pyroprocess gas is direct and conversion is front of conversion reaction, has greatly simplified device structure, has effectively utilized heat energy; Because pyroprocess gas is thermopositive reaction in conversion reaction, therefore, the heats of chilling process gas is better.
3) water cooler and Process Gas water cooler adopt hot pipe technique between the bed, adopt the flow direction control of cold fluid and hot fluid, can avoid the generation of dew point corrosion; Heat pipe outer setting fin, but enhanced heat exchange effect.
Description of drawings
Fig. 1 is the heat-exchange method synoptic diagram of pyroprocess gas and chilling process gas in the relieving haperacidity process of the present invention.
Fig. 2 is heat pipe structure figure.
Among the figure: water cooler 4-chilling process gas outlet 5-next section convertor (next section beds) 6-Process Gas water cooler 7-chilling process gas entrance 8-pyroprocess gas outlet 9-inner core 10-Process Gas pipe connecting 11-heat pipe 12-fin between 1-pyroprocess gas entrance 2-the preceding paragraph convertor (the preceding paragraph beds) 3-bed
Embodiment
The heat-exchange method of pyroprocess gas and chilling process gas in a kind of relieving haperacidity process, the method reclaims the reaction heat that the beds conversion reaction produces, the process gas before the direct heating conversion reaction.Utilize the pyroprocess gas direct heating chilling process gas that transforms through beds, make pyroprocess gas and chilling process gas carry out gas and gas direct heat exchange.
See Fig. 1, pyroprocess gas successively enters water cooler 3 between bed, next section beds 5, Process Gas water cooler 6 from the preceding paragraph beds 2, in the preceding paragraph beds 2 and next section beds 5 interior pyroprocess gas and catalyzer generation conversion reaction, emit heat; Pyroprocess gas and chilling process gas carry out twice heat exchange in water cooler 2 and the Process Gas water cooler 6 between bed, heating chilling process gas; Chilling process gas through 6 heat exchange of process Gas Cooler enters water cooler 3 between bed through Process Gas pipe connecting 10, after water cooler between bed 3 heats up with the heat exchange of pyroprocess gas again, is flowed out by chilling process gas outlet 4.Concrete steps are as follows:
1) device that adopts is tube structure, be followed successively by water cooler 3, next section convertor 5, Process Gas water cooler 6 between the preceding paragraph convertor 2, bed from top to bottom, be provided with beds in the preceding paragraph convertor 2 and next section convertor 5, water cooler 3 is connected by Process Gas pipe connecting 10 with Process Gas water cooler 6 between bed; Water cooler 3 is provided with inner core 9 structures that pyroprocess gas passes through with Process Gas water cooler 6 middle parts between described bed; Space between inner core 9 and the outside cylindrical shell is chilling process gas passage; The outer wall of Process Gas water cooler 6 is provided with chilling process gas import 7, and the outer wall of water cooler 3 is provided with chilling process gas outlet 4 between bed;
2) pyroprocess gas is entered by the pyroprocess gas entrance 1 at device top, in the preceding paragraph convertor 2, carry out conversion reaction with catalyzer, then enter water cooler 3 between bed, the chilling process gas of pyroprocess gas and inner core outside carries out heat exchange in water cooler 3 inner cores 9 between bed; Then enter in next section convertor 5 and again carry out conversion reaction with catalyzer, enter Process Gas water cooler 6 after the conversion reaction, the chilling process gas with the inner core outside in Process Gas water cooler 6 inner cores carries out heat exchange, is flowed out by pyroprocess gas outlet 8 at last;
3) the chilling process gas through 6 heat exchange of process Gas Cooler enters water cooler 3 between bed through Process Gas pipe connecting 10, water cooler between bed 3 again with the heat exchange of pyroprocess gas after, flowed out by chilling process gas outlet 4.
See Fig. 1, Fig. 2, water cooler 3 adopts heat pipe with the heat exchange element of Process Gas water cooler 6 between bed, and heat pipe 11 is obliquely installed, and heat pipe one end is positioned at inner core 9, and the other end is positioned at the inner core outside, and an end that is positioned at inner core is lower than an end of inner core outside.Heat pipe 11 outsides are provided with fin 12 structures.
The present invention adopts the pyroprocess gas of participation conversion reaction and the chilling process gas direct heat exchange before the reaction, efficient recovery pyroprocess gas and conversion reaction liberated heat, fully heated chilling process gas, adopt this heat-exchange method, compare with traditional employing finned tube heat exchanger fused salt or the indirect heat exchange mode of superheated vapour, greatly simplify technique, saved occupation of land and facility investment, and reduced energy consumption.
Claims (2)
1. the heat-exchange method of pyroprocess gas and chilling process gas in the relieving haperacidity process, it is characterized in that, the method utilization makes pyroprocess gas and chilling process gas carry out gas and gas direct heat exchange through the pyroprocess gas direct heating chilling process gas that beds transforms; Pyroprocess gas successively enters water cooler between bed, next section beds, Process Gas water cooler from the preceding paragraph beds, in beds pyroprocess gas and catalyzer generation conversion reaction, emits heat; Pyroprocess gas and chilling process gas carry out twice heat exchange in water cooler and the Process Gas water cooler between bed, heating chilling process gas; Chilling process gas through the heat exchange of process Gas Cooler enters water cooler between bed through the Process Gas pipe connecting, after water cooler between bed heats up with the heat exchange of pyroprocess gas again, is flowed out by the outlet of chilling process gas; Concrete steps are as follows:
1) device that adopts is tube structure, be followed successively by water cooler, next section convertor, Process Gas water cooler between the preceding paragraph convertor, bed from top to bottom, be provided with beds in the preceding paragraph convertor and next section convertor, water cooler is connected by the Process Gas pipe connecting with the Process Gas water cooler between bed; Water cooler and Process Gas water cooler middle part are provided with the inner tube structure that pyroprocess gas passes through between described bed; Space between inner core and the outside cylindrical shell is chilling process gas passage; The outer wall of Process Gas water cooler is provided with the import of chilling process gas, and the outer wall of water cooler is provided with the outlet of chilling process gas between bed;
2) pyroprocess gas is entered by the pyroprocess gas entrance at device top, in the preceding paragraph convertor, carry out conversion reaction with catalyzer, then enter water cooler between bed, the chilling process gas of pyroprocess gas and inner core outside carries out heat exchange in the water cooler inner core between bed; Then enter in next section convertor and again carry out conversion reaction with catalyzer, enter the Process Gas water cooler after the conversion reaction, the chilling process gas with the inner core outside in Process Gas water cooler inner core carries out heat exchange, is flowed out by the outlet of pyroprocess gas at last;
3) the chilling process gas through the heat exchange of process Gas Cooler enters water cooler between bed through the Process Gas pipe connecting, water cooler between bed again with the heat exchange of pyroprocess gas after, flowed out by chilling process gas outlet.
2. the heat-exchange method of pyroprocess gas and chilling process gas in a kind of relieving haperacidity process according to claim 1, it is characterized in that, the heat exchange element of water cooler and Process Gas water cooler adopts heat pipe between described bed, heat pipe is obliquely installed, heat pipe one end is positioned at inner core, the other end is positioned at the inner core outside, and an end that is positioned at inner core is lower than an end of inner core outside; Described heat pipe outside is provided with fin structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100851113A CN102303848B (en) | 2011-04-02 | 2011-04-02 | Method for exchanging heat between high-temperature process gas and low-temperature process gas in acid production process |
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| CN2011100851113A CN102303848B (en) | 2011-04-02 | 2011-04-02 | Method for exchanging heat between high-temperature process gas and low-temperature process gas in acid production process |
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| CN102303848A CN102303848A (en) | 2012-01-04 |
| CN102303848B true CN102303848B (en) | 2013-04-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103043626A (en) * | 2012-10-31 | 2013-04-17 | 宜兴市化工成套设备有限公司 | Horizontal quasi isothermal converter |
| CN102910592B (en) * | 2012-10-31 | 2014-04-09 | 宜兴市化工成套设备有限公司 | Quasi-isothermal venturi converter for heat energy substitution |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2280087Y (en) * | 1996-12-20 | 1998-04-29 | 南京化工大学 | Reactor for conversion sulfur oxides by use of heat pipe heat-exchange |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2280087Y (en) * | 1996-12-20 | 1998-04-29 | 南京化工大学 | Reactor for conversion sulfur oxides by use of heat pipe heat-exchange |
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