CN209835635U - Claus air distribution control system based on sulfur recovery device - Google Patents
Claus air distribution control system based on sulfur recovery device Download PDFInfo
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- CN209835635U CN209835635U CN201920491803.XU CN201920491803U CN209835635U CN 209835635 U CN209835635 U CN 209835635U CN 201920491803 U CN201920491803 U CN 201920491803U CN 209835635 U CN209835635 U CN 209835635U
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Abstract
The utility model belongs to the technical field of Claus sulfur recovery process, and relates to a Claus air distribution control system based on a sulfur recovery device. The device comprises a combustion unit, a Claus reaction unit, a gas distribution unit, a pipeline and a valve, wherein the pipeline is communicated with the Claus reaction unit and the gas distribution unit according to process requirements; h is arranged on a pipeline between a first-stage converter and a second-stage converter of the Claus reaction unit2S/SO2And (4) detecting the instrument on line. The utility model discloses a Claus air distribution control system with H2S/SO2The on-line analyzer is arranged at the outlet of the Claus secondary reactor, and the outlet of the Claus primary reactor is changed, so that the lag time of detection feedback is reduced.
Description
Technical Field
The utility model belongs to the technical field of Claus sulfur recovery process, and relates to a Claus air distribution control system based on a sulfur recovery device.
Background
The existing acid gas sulfur recovery process mainly comprises a sulfur production combustion furnace, a two-stage Claus reactor and the like along the airflow direction. In sulfur-producing furnacesHigh-temperature thermal reaction occurs, one third of H in the feed gas2S is combusted into SO2Two thirds of H2S and SO formed2The Claus reaction is carried out, the mixed gas leaving the combustion chamber is cooled, then the liquid sulfur is separated, the gas enters two stages of Claus reactors in sequence to carry out Claus catalytic reaction, the recovery rate of the sulfur is further improved, and H in the acid gas is obtained2S is converted into sulfur for recovery. An instrument control system is utilized in the whole process, so that the device is ensured to keep stable and efficient operation. For example, an on-line acid gas analyzer is disposed in the acid gas line, and a second Claus reactor is followed by a H analyzer2S/SO2The proportion analyzer realizes the effective control of air distribution.
The overall reaction equation for the Claus sulfur production reaction can be expressed as follows:
2H2S+SO2＝S2+2H2o + Q (exothermic)
When reactant H in the Claus reactor2S、SO2The closer the concentration is to the equivalent reaction ratio, the higher the conversion of the reaction. Controlling the air distribution of the claus process is therefore key to increasing the conversion of the claus process.
The traditional Claus air distribution control system adopts a 'proportion + feedforward' double-loop mode, main air accounts for 80-90% of the total air supply quantity, keeps a certain proportion with acid air flow, and changes along with the fluctuation of the acid air flow, namely proportion control. The auxiliary air accounts for 10-20% of the total air distribution amount, and the auxiliary air is arranged at the outlet of the last-stage Claus reactor2S/SO2The on-line analyzer monitors the reaction result in real time, compares the detection result with a standard value, and then properly corrects the secondary wind, which is called feedforward control.
The proportional control mode mainly deals with the fluctuation of the acid gas flow, the main air tracks the change of the acid gas flow according to a certain proportion, and the adjustment range is large, belonging to a rough adjustment mode.
The feedforward control mode mainly deals with the change of the acid gas concentration, and an online detecting instrument arranged at the outlet of the Claus last-stage reactor monitors H in the product of the reactor2S andSO2the flow of the secondary air is accurately adjusted by a PID controller to ensure that the outlet H of the Claus process reactor is subjected to the change of the ratio2S and SO2The ratio of (a) approaches the ideal reaction ratio.
The proportional + feedforward control system has the characteristic of simple control loop, but because of H2S/SO2The on-line analyzer is installed at the outlet of the last-stage Claus reactor, and the obtained detection result always lags behind the real-time change of the acid gas. When the process gas composition data at the outlet of the Claus last reactor is from H2S/SO2After the on-line analyzer shows, since it takes a certain time for the acid gas to be mixed with air and burned and reacted through the claus reactor, it is actually indicated that the acid gas is ventilated before a certain time.
Meanwhile, feedforward control is actually a process of continuously comparing and correcting a target value and a measured value, and the process aggravates the time lag of a control system, so that the conventional proportional-feedforward control system cannot achieve higher yield of the claus reaction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior production device and the prior process, and provides a Claus air distribution control system based on a sulfur recovery device. The utility model discloses a process can be very big shorten lag time, improve the accuracy of air distribution to improve the conversion rate of Claus technology.
The utility model discloses an adopt following technical scheme to realize:
a Claus air distribution control system based on a sulfur recovery device comprises a combustion unit, a Claus reaction unit, an air distribution unit, a pipeline and a valve, wherein the pipeline is communicated with the Claus reaction unit and the air distribution unit according to process requirements; the sulfur production combustion furnace is provided with an air inlet pipe and an acid gas inlet pipe, and the Claus unit comprises a primary condensation cooler, a heater, a primary converter, a secondary condensation cooler, a secondary converter, a tertiary condensation cooler and a tail gas liquid separation tank; the gas distribution unit comprises a sulfur production blower, a main air volume regulating valve and an auxiliary air volume regulating valve which are respectively positioned on a main air pipeline and an auxiliary air pipeline of the sulfur production blower, and a DCS control system, wherein the main air pipeline and the auxiliary air pipeline are converged and communicated with an air inlet pipe of the sulfur production combustion furnace;
flow detecting instruments are arranged on the main air pipeline and the auxiliary air pipeline, a PID controller controlled according to a set value is arranged on the main air volume adjusting valve, a flow detecting instrument for measuring acid gas flow is arranged on the acid gas inlet pipe, and signal output ends of the flow detecting instruments on the main air pipeline and the acid gas inlet pipe are electrically connected with signal input ends of the PID controller on the main air volume adjusting valve; the pipeline between the first-stage converter and the second-stage converter is provided with H2S/SO2On-line measuring instrument, H2S/SO2The flow detection instrument on the on-line detection instrument and the secondary air pipeline is connected to the signal input end of the DCS control system, and the flow controller arranged on the secondary air volume regulating valve is connected to the signal output end of the DCS control system.
Further, the acid gas inlet pipe comprises a clean acid gas inlet pipe and an ammonia-containing acid gas inlet pipe, and the pipeline communicated with the clean acid gas inlet pipe and the ammonia-containing acid gas inlet pipe is respectively provided with a detection instrument for measuring the flow of acid gas.
Further, said H2S/SO2The online detection instrument is arranged on an outlet pipeline of the secondary condensation cooler.
Further, the heater may employ a steam heater, an electric heater, an in-line heating furnace, a high-temperature blending valve, or the like.
The utility model has the advantages that:
the utility model discloses a Claus air distribution control system based on sulphur recovery unit, with H2S/SO2The on-line analyzer is arranged at the outlet of the Claus secondary reactor, and the outlet of the Claus primary reactor is changed, so that the lag time of detection feedback is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic view of a Claus air distribution control system based on a sulfur recovery unit according to example 1;
FIG. 2 is a schematic diagram of a conventional Claus air distribution control system provided in comparative example 1;
reference numbers in the figures: the system comprises a sulfur production combustion furnace 1, a sulfur production waste heat boiler 2, a first-stage condensation cooler 3, a heater 4, a first-stage converter 5, a process gas heat exchanger 6, a second-stage condensation cooler 7, a second-stage converter 8, a third-stage condensation cooler 9, a tail gas liquid separation tank 10, a sulfur production blower 11, a main air volume regulating valve 12, an auxiliary air volume regulating valve 13, an acid gas A inlet pipe and a tail gas B outlet pipe.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. The devices, materials, reagents and the like used in the following examples are commercially available unless otherwise specified. In the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The utility model discloses in, control system control H2S/SO2The online detection instrument and the air volume adjusting valve are common means in the prior art, and the PID controller is a conventional control system.
Example 1
As shown in figure 1, the Claus air distribution control system based on the sulfur recovery device of the embodiment comprises a combustion unit, a Claus reaction unit, an air distribution unit, a pipeline communicated with the above units according to the process requirements and a valve arranged on the pipeline, and is characterized in that,
the combustion unit comprises a sulfur production combustion furnace 1 and a sulfur production waste heat boiler 2 communicated with an air outlet pipe of the sulfur production combustion furnace; the sulfur production combustion furnace is provided with an air inlet pipe and an acid gas inlet pipe A;
the Claus unit comprises a primary condensation cooler 3, a heater 4, a primary converter 5, a secondary condensation cooler 7, a secondary converter 8, a tertiary condensation cooler 9 and a tail gas separating tank 10 which are sequentially communicated; the primary condensation cooler is communicated with a tail gas outlet pipe of the sulfur production waste heat boiler and is provided with a liquid sulfur outlet pipe; the secondary condensation cooler is provided with an air inlet pipe communicated with the air outlet pipe of the primary converter and an air outlet pipe communicated with the air inlet pipe of the secondary converter, the air inlet pipe and the air outlet pipe of the secondary condensation cooler are both partially arranged inside the process gas heat exchanger 6, and the process gas heat exchanger and the secondary condensation cooler are respectively provided with a liquid sulfur liquid outlet pipe; the third-stage condensation cooler is provided with a liquid sulfur liquid outlet pipe and a tail gas outlet pipe communicated with the tail gas liquid separating tank; the tail gas separating tank is provided with a liquid sulfur outlet pipe and a tail gas outlet pipe B communicated with the outside; liquid flow outlet pipes of all the devices are communicated with a sulfur sealing tank;
the air distribution unit comprises a sulfur production blower 11, a main air volume regulating valve 12 and an auxiliary air volume regulating valve 13 which are respectively positioned on two air outlet pipelines of the sulfur production blower, wherein the main air and the auxiliary air come from the sulfur production blower, the main air volume is large, the auxiliary air flow is small but accurate, the main air and the auxiliary air are converged and then enter a sulfur production combustion furnace, and the two air outlet pipelines of the sulfur production blower are converged and communicated with an air inlet pipe of the sulfur production combustion furnace.
The acid gas inlet pipe is provided with a flow detection instrument for measuring acid gas flow, and the signal output ends of the flow detection instruments on the main air pipeline and the acid gas inlet pipe are electrically connected with the signal input end of the PID controller on the main air flow adjusting valve.
H2S/SO2The online detection instrument is specifically arranged on an outlet pipeline of the secondary condensation cooler, the outlet temperature of the secondary condensation cooler is proper, the sulfur fog in the process gas is less, and the online instrument sampling can be effectively protectedThe service life of the system. H2S/SO2The flow detection instrument on the on-line detection instrument and the secondary air pipeline is connected to the signal input end of the DCS control system, and the flow controller arranged on the secondary air volume regulating valve is connected to the signal output end of the DCS control system.
The acid gas inlet pipe comprises a clean acid gas inlet pipe and an ammonia-containing acid gas inlet pipe, and detection instruments for measuring acid gas flow are respectively arranged on pipelines communicated with the clean acid gas inlet pipe and the ammonia-containing acid gas inlet pipe.
With 10 ten thousand tons/year sulphur recovery unit design load operating mode, the utility model provides a control process based on sulphur recovery unit's claus air distribution control system contains following specific steps:
(1) calculating to obtain theoretical air distribution coefficient of the acid gas according to a chemical reaction equation based on the composition of the acid gas, and setting an initial main air volume regulating valve and an auxiliary air volume regulating valve according to the acid gas flow; mixing acid gas and main air in proportion, and then feeding the mixture into a sulfur production combustion furnace, wherein the acid gas generates a combustion reaction;
(2) high-temperature process gas discharged from the sulfur-making combustion furnace enters a sulfur-making waste heat boiler for cooling, and the cooled process gas enters a primary condensation cooler; condensing sulfur in the process gas into liquid sulfur in a primary condensing cooler, collecting and separating the liquid sulfur, then feeding the liquid sulfur into a sulfur sealing tank, heating the process gas by a heater, and feeding the process gas into a primary converter; h in the process gas under the action of the catalyst in the first converter2S and SO2Performing a Claus reaction to convert the sulfur into elemental sulfur, and allowing the high-temperature process gas discharged from the primary converter to enter a secondary condensation cooler through a process gas heat exchanger; in the process gas heat exchanger, the high-temperature process gas from the primary converter exchanges heat with the low-temperature process gas from the secondary condensing cooler, and the cooled high-temperature process gas enters the secondary condensing cooler; in a secondary condensation cooler, the process gas is further cooled, the sulfur in the process gas is condensed into liquid sulfur, the liquid sulfur is collected and separated and then enters a sulfur sealing tank, and the cooled process gas passes through H2S/SO2The online detection instrument enters the process gas heat exchanger to be heated and then enters the secondary converter;
(3)H2S/SO2on-line detecting instrument for detecting H in process gas2S and SO2Content of (D), DCS System Collection of H2S/SO2The data of the online detection instrument corrects the original set value of the auxiliary air in the step (1), and the auxiliary air quantity regulating valve is regulated according to the new set value of the auxiliary air;
(4) in the secondary converter, H remaining in the process gas2S and SO2Further carrying out catalytic conversion, further cooling the converted high-temperature process gas by a three-stage condensation cooler, allowing the converted high-temperature process gas to enter a tail gas liquid separation tank, and trapping and separating liquid sulfur condensed in the three-stage condensation cooler and the tail gas liquid separation tank, and allowing the liquid sulfur to enter a sulfur seal tank; and (4) enabling the sulfur production tail gas to enter a tail gas treatment part, and recovering liquid sulfur in the sulfur seal tank.
And the auxiliary air regulating valve rapidly regulates the flow of the auxiliary air to the right position according to the new set value, and the regulating time is about 28.82 s.
Comparative example 1
As shown in FIG. 2, comparative example 1 is different from example 1 in that H in the gas distribution unit in the system2S/SO2The on-line detection instrument is arranged at the air outlet of the tail gas liquid separation tank. The time consumed by the whole Claus process for the process gas flow after the combustion of the sulfur production furnace is calculated according to the design load working condition of the 10 ten thousand tons/year sulfur recovery device is shown in the following table 1:
TABLE 1 comparative example 1 time consuming schedule for the entire Claus process
When the on-line measuring instrument is arranged at the outlet of the Claus process final-stage reactor, the time for unit volume of acid gas to obtain a reaction result from the beginning of entering the Claus process to the end of the reaction is up to 57.02s, namely, the period of each optimized adjustment is 57.02s, which is obviously higher than the adjustment time in the example 1.
Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.
Claims (4)
1. A Claus air distribution control system based on a sulfur recovery device comprises a combustion unit, a Claus reaction unit, an air distribution unit, a pipeline and a valve, wherein the pipeline is communicated with the above units according to process requirements, the valve is arranged on the pipeline, and the combustion unit comprises a sulfur production combustion furnace (1) and a sulfur production waste heat boiler (2) which is communicated with an air outlet pipe of the sulfur production combustion furnace (1); the sulfur production combustion furnace (1) is provided with an air inlet pipe and an acid gas inlet pipe (A), the Claus unit comprises a first-stage condensation cooler (3), a heater (4), a first-stage converter (5), a second-stage condensation cooler (7), a second-stage converter (8), a third-stage condensation cooler (9) and a tail gas separating tank (10),
the system is characterized in that the air distribution unit comprises a sulfur production blower (11), a main air volume regulating valve (12) and an auxiliary air volume regulating valve (13) which are respectively positioned on a main air pipeline and an auxiliary air pipeline of the sulfur production blower (11), and a DCS control system, wherein the main air pipeline and the auxiliary air pipeline are converged and communicated with an air inlet pipe of the sulfur production combustion furnace (1);
flow detecting instruments are arranged on the main air pipeline and the auxiliary air pipeline, a PID controller which is controlled according to a set value is arranged on the main air volume adjusting valve (12), a flow detecting instrument for measuring acid gas flow is arranged on the acid gas inlet pipe (A), and the signal output ends of the flow detecting instruments on the main air pipeline and the acid gas inlet pipe (A) are electrically connected with the signal input end of the PID controller on the main air volume adjusting valve (12); h is arranged on the pipeline between the first-stage converter (5) and the second-stage converter (8)2S/SO2On-line measuring instrument, H2S/SO2The flow detection instrument on the on-line detection instrument and the secondary air pipeline is connected to the signal input end of the DCS control system, and the flow controller arranged on the secondary air volume adjusting valve (13) is connected to the signal output end of the DCS control system.
2. The claus air distribution control system based on sulfur recovery unit of claim 1, wherein the acid gas inlet pipe (a) comprises a clean acid gas inlet pipe and an ammonia-containing acid gas inlet pipe, and the clean acid gas inlet pipe and the ammonia-containing acid gas inlet pipe are respectively provided with a detecting instrument for measuring the flow of acid gas.
3. The sulfur recovery unit-based Claus air distribution control system of claim 1 wherein the H2S/SO2The online detection instrument is arranged on an outlet pipeline of the secondary condensation cooler (7).
4. The claus air distribution control system based on sulfur recovery unit of claim 1 wherein the heater (4) employs steam heater, electric heater, on-line furnace, high temperature blending valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920491803.XU CN209835635U (en) | 2019-04-12 | 2019-04-12 | Claus air distribution control system based on sulfur recovery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920491803.XU CN209835635U (en) | 2019-04-12 | 2019-04-12 | Claus air distribution control system based on sulfur recovery device |
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| CN209835635U true CN209835635U (en) | 2019-12-24 |
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| CN201920491803.XU Active CN209835635U (en) | 2019-04-12 | 2019-04-12 | Claus air distribution control system based on sulfur recovery device |
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Address after: 255434 No. 22, middle refinery Road, Linzi District, Shandong, Zibo Patentee after: Shandong Sanwei Chemical Group Co.,Ltd. Address before: 255434 No. 22, middle refinery Road, Linzi District, Shandong, Zibo Patentee before: SHANDONG SUNWAY PETROCHEMICAL ENGINEERING Co.,Ltd. |
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