CN108128756B - Treatment control device and method for recovering sulfur from coke oven gas desulfurization waste liquid - Google Patents
Treatment control device and method for recovering sulfur from coke oven gas desulfurization waste liquid Download PDFInfo
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- CN108128756B CN108128756B CN201711434353.2A CN201711434353A CN108128756B CN 108128756 B CN108128756 B CN 108128756B CN 201711434353 A CN201711434353 A CN 201711434353A CN 108128756 B CN108128756 B CN 108128756B
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- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0404—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process
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Abstract
The invention discloses a device and a method for treating and controlling sulfur recovery from a coke oven gas desulfurization waste liquid, and belongs to the technical field of coke oven gas desulfurization. The device for treating and controlling the recovery of sulfur from the coke oven gas desulfurization waste liquid comprises: a centrifuge; the slurry tank is communicated with the centrifuge; the stirrer is arranged in the slurry tank; the slurry pump is communicated with the slurry tank; the at least two sulfur melting kettle mechanisms are communicated with the slurry pump, and a manual switching valve is arranged at the communication position of each sulfur melting kettle mechanism of the at least two sulfur melting kettle mechanisms and the slurry pump; the flow meter is arranged between the at least two sulfur melting kettle mechanisms and the slurry pump; the flow regulating valve is arranged between the flowmeter and the at least two sulfur melting kettle mechanisms; the programmable logic controller is connected with the centrifuge, the stirrer, the slurry pump, the at least two sulfur melting kettle mechanisms, the flow meter and the flow regulating valve. The device and the method for treating and controlling the sulfur recovery from the coke oven gas desulfurization waste liquid fully utilize the high desulfurization rate of the NNF method and reduce the equipment investment cost.
Description
Technical Field
The invention relates to the technical field of coke oven gas desulfurization, in particular to a device and a method for treating and controlling sulfur recovered from a coke oven gas desulfurization waste liquid.
Background
The air pollution is serious in China, the total emission amount of polluted waste gas is at a higher level, advanced design and manufacturing technologies are not mastered in China at present, and after treatment means are fallen, the emission standard requirement is low, and continuous learning and innovation are needed. In order to strictly control the pollution emission, a desulfurization section is set in a coking plant, coke oven gas is generated during the coking production of a coking enterprise, more than 95 percent of sulfur in the gas exists in the form of hydrogen sulfide, and the rest is organic sulfur. NNF is the abbreviation of English New NSEC Fumax, and is a closed system for continuously removing hydrogen sulfide and hydrogen fluoride from coke oven gas, oxidizing, burning and decomposing waste liquid generated in the process, and recovering valuable concentrated sulfuric acid. In particular, the wet oxidation method is a novel wet oxidation method which can maintain a high desulfurization efficiency without generating a waste liquid in an inexpensive apparatus by controlling the salt concentration in a desulfurization solution to a certain concentration so that a desulfurization facility can be manufactured from plain carbon steel. The NNF process uses a cheaper catalyst, does not supplement an alkali source from the outside, and achieves economical operation and high desulfurization rate. The NNF method for desulfurization is characterized in that: (1) the desulfurization and decyanation efficiency is high, the desulfurization rate is more than 99 percent, the decyanation rate is more than 98 percent, the highest level is reached in a wet oxidation method, and the burden of secondary desulfurization equipment is also reduced. (2) The device is miniaturized, and the desulfurization body comprises a desulfurizing tower and a regenerator column, and regenerator column's height only is about 1/4 of desulfurizing tower. (3) Only a catalyst is required except that no alkaline chemicals are required. However, in any case, the wet oxidation method generates salt as a byproduct, and thus it is necessary to discharge the desulfurization waste liquid to the outside without interruption. However, the equipment cost for burning the desulfurization waste liquid into the concentrated sulfuric acid in the NNF method in the prior art is high.
Disclosure of Invention
The invention provides a device and a method for treating and controlling sulfur recovered from a coke oven gas desulfurization waste liquid, which solve or partially solve the technical problem of high equipment cost in burning concentrated sulfuric acid from the desulfurization waste liquid in an NNF method in the prior art.
In order to solve the technical problem, the invention provides a device for treating and controlling the recovery of sulfur from the desulfurization waste liquid of coke oven gas, which comprises: a centrifuge; a slurry tank in communication with the centrifuge; the stirrer is arranged in the slurry tank; the slurry pump is communicated with the slurry tank; the sulfur melting kettle mechanisms are communicated with the slurry pump, and a stop valve is arranged at the communication position of each sulfur melting kettle mechanism in the sulfur melting kettle mechanisms and the slurry pump; the flowmeter is arranged between the at least two sulfur melting kettle mechanisms and the slurry pump; the flow regulating valve is arranged between the flowmeter and the at least two sulfur melting kettle mechanisms; the programmable logic controller is connected with the centrifuge, the stirrer, the slurry pump, the at least two sulfur melting kettle mechanisms, the flow meter and the flow regulating valve; the programmable logic controller sends start-stop signals to the centrifuge, the stirrer, the slurry pump and the at least two sulfur melting kettle mechanisms, receives alarm signals sent by the centrifuge, sends adjusting signals to the flow regulating valve according to the alarm signals, sends flow signals to the programmable logic controller, and sends control signals to the flow regulating valve.
Furthermore, a liquid level detector is arranged on the slurry tank and connected with the programmable logic controller, and the liquid level detector sends a liquid level signal to the programmable logic controller.
Further, the sulfur melting kettle mechanism comprises: the sulfur melting kettle is communicated with the slurry pump; the pressure regulating valve is communicated with the sulfur melting kettle; the pressure detector is communicated with the sulfur melting kettle; the temperature detector is communicated with the sulfur melting kettle; the steam conveying pipe is communicated with the sulfur melting kettle, and a temperature regulating valve is arranged on the steam conveying pipe; the medium dissolving tank is communicated with the sulfur melting kettle; the pressure regulating valve, the pressure detector, the temperature detector and the temperature regulating valve are connected with the programmable logic controller, the programmable logic controller receives a pressure signal sent by the pressure detector, sends an opening and closing signal to the pressure regulating valve according to the pressure signal, receives a temperature signal sent by the temperature detector, and sends a regulating signal to the temperature regulating valve according to the temperature signal.
Furthermore, the flow regulating valve comprises an upper regulator and a lower regulator, and the upper regulator and the lower regulator have cascade, automatic and manual working modes.
Based on the same inventive concept, the invention also provides a treatment control method for recovering sulfur from the coke oven gas desulfurization waste liquid, which comprises the following steps: the programmable logic controller sends a starting signal to a centrifuge, and the centrifuge separates slurry in the desulfurization waste liquid and stores the slurry in a slurry tank; when the liquid level in the slurry tank reaches a specified value, the programmable logic controller sends a starting signal to a stirrer, and the stirrer stirs the slurry in the slurry tank; the programmable logic controller sends a starting signal to a slurry pump, and the slurry pump conveys the slurry stirred in the slurry tank to one of the at least two sulfur melting kettle mechanisms through a flow meter and a flow regulating valve; the flow meter sends a flow signal to the programmable logic controller, calculates the amount of the slurry filled into the sulfur melting kettle mechanism according to the slurry flow, finishes charging when the slurry reaches 80 percent of the inner volume of the sulfur melting kettle mechanism, closes a stop valve of one sulfur melting kettle mechanism of the at least two sulfur melting kettle mechanisms, opens a stop valve of the other sulfur melting kettle mechanism of the at least two sulfur melting kettle mechanisms, and charges; and heating the sulfur melting kettle mechanism after the charging is finished, and discharging liquid sulfur after the heating of the sulfur melting kettle mechanism is finished.
Furthermore, an upper regulator and a lower regulator are arranged in the flow regulating valve, and the upper regulator and the lower regulator have cascade, automatic and manual working modes.
Further, when the programmable logic controller is started, the flow regulating valve firstly enters a state A: the lower regulator is in a manual mode, the SP tracks PV, and MV is output by 0%; in the manual mode of the upper regulator, the SP tracks PV, the MV value is kept in the original state, the SP is a set value, the PV is a process value fed back by the instrument, and the MV is a valve position output value; after the programmable logic controller is started, if the slurry flow detection is normal, the centrifuge runs and no alarm is given, the flow regulating valve enters a state B: the lower regulator manual mode is characterized in that the SP tracks PV, the MV value is adjustable, the upper regulator manual mode is characterized in that the SP tracks PV, and the MV value is kept in the original state; after the flow regulating valve enters the state B, if the conditions of normal slurry flow detection, centrifuge operation and no alarm are kept, the flow regulating valve can be conditionally switched among the following states; if the lower level regulator is switched to the automatic mode, the flow regulating valve enters a state C: the lower regulator is in an automatic mode, the lower regulator SP tracks PV, MV values are kept in an original state, the upper regulator is in a manual mode, and the upper regulator SP tracks PV and MV; if the lower regulator is kept in the automatic mode, the flow regulating valve enters a state D: the lower regulator is in an automatic mode, the lower regulator is in PID control and outputs an MV value, and the upper regulator is in a manual mode, and the upper regulator SP tracks PV and MV. If the lower regulator is kept in an automatic regulation mode, the slurry tank liquid level detection is normal, the upper regulator selects the automatic mode, and the regulation system enters a state E when the upper regulator and the lower regulator are arranged in cascade: the lower regulator cascade mode, the lower regulator PID control, outputs MV value, the upper regulator automatic mode, the upper regulator SP tracks PV, MV value keeps original state; if the lower regulator is kept in the cascade regulation mode, the slurry tank liquid level detection is normal, and the upper regulator is kept in the automatic mode, the regulation system enters a state F: the lower regulator cascade mode, the lower regulator PID control and the upper regulator automatic mode output MV values, and the upper regulator PID control and the MV values are output to the lower SP value; when the flow regulating valve is in the E or F state, if the upper regulating meter and the lower regulating meter are disconnected in cascade connection or the liquid level detection of the slurry tank is abnormal, the flow regulating valve enters the D state; under any state of C, D, E, F, if the lower level regulator selects a manual mode, or slurry flow detection is abnormal or an operating centrifuge gives an alarm, the flow regulating valve enters a G state: the lower regulator manual mode, the SP tracking PV, the MV value keeping original state, the upper regulator manual mode, the SP tracking PV, the MV value keeping original state, and the flow regulating valve in the G state, if the lower regulator keeps the manual mode, the flow regulating valve enters the B state; when the slurry flow is detected abnormally or the centrifuge stops running or the centrifuge alarms, the flow regulating valve enters the A state from the C, D, E, F, G state, and when the flow regulating valve returns to the normal state, the flow regulating valve automatically enters the B state from the A state and can be conditionally switched at the C, D, E, F, G state.
Further, when the centrifuge sends an alarm signal to the programmable logic controller, the programmable logic controller sends an adjusting signal to the flow regulating valve, the flow regulating valve is in a G state, the output MV of the lower regulator gradually decreases from the current output to 0.5-1 time of the current output within a fixed time T, T is 6-20 seconds, and then the output MV is adjusted to be manually operated.
Further, when the slurry liquid level of the slurry tank is higher than the height of a stirrer blade after the centrifugal machine is started, the programmable logic controller sends a starting signal to the stirrer, and the stirrer is started; and in the working process of the stirrer, when the liquid level of the slurry tank is lower than the height of the stirrer blade or larger than the working range of the stirrer, the programmable logic controller sends a stop signal to the stirrer, the stirrer stops in linkage, and after 5 seconds of delay, the slurry pump stops in linkage.
Further, when the set charging amount of the sulfur melting kettle mechanism is reached, the charging is stopped, and the programmable logic controller sends a heating signal to the sulfur melting kettle mechanism; in the heating stage, the temperature in the sulfur melting kettle mechanism is controlled to be 140-150 ℃, and the heating process is about 5-8 hours; and simultaneously controlling the pressure in the sulfur melting kettle mechanism in the heating process, wherein when the sulfur melting kettle mechanism starts to heat, the pressure in the sulfur melting kettle mechanism is 430Kpa-470Kpa and is kept for 4-6 hours, and the pressure in the sulfur melting kettle mechanism is 150Kpa and is kept for 1-2 hours, so that the heating is finished.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the programmable logic controller sends a starting signal to the centrifuge, the centrifuge separates the slurry in the desulfurization waste liquid and stores the slurry in the slurry tank, when the liquid level in the slurry tank reaches a specified value, the programmable logic controller sends the starting signal to the stirrer, the stirrer stirs the slurry in the slurry tank, the programmable logic controller sends the starting signal to the slurry pump, the slurry pump conveys the slurry stirred in the slurry tank to one of the at least two sulfur melting kettle mechanisms through the flow meter and the flow regulating valve, the flow meter sends a flow signal to the programmable logic controller, the amount of the slurry filled into the sulfur melting kettle mechanisms is calculated according to the flow meter, when the volume of the slurry reaches 80 percent of the volume in the sulfur melting kettle mechanisms, the charging is completed, the stop valve of one of the at least two sulfur melting kettle mechanisms is closed, and the stop valve of the other sulfur melting kettle mechanism of the at least two sulfur melting kettle mechanisms is opened, the method comprises the steps of charging, heating the sulfur melting kettle mechanism after charging, discharging liquid sulfur after heating of the sulfur melting kettle mechanism is completed, treating recovered sulfur as desulfurization waste liquid, and reducing equipment investment cost while fully utilizing high desulfurization rate of an NNF method.
Drawings
FIG. 1 is a schematic structural diagram of a sulfur treatment control device for recovering desulfurization waste liquid of coke oven gas provided by an embodiment of the invention;
fig. 2 is a control schematic diagram of a flow rate regulating valve according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the device for treating and controlling the recovery of sulfur from the desulfurization waste liquid of coke oven gas provided by the embodiment of the invention comprises: centrifuge 1, thick liquid groove 2, mixer 3, thick liquid pump 4, at least two sulfur melting kettle mechanisms 5, flowmeter 6, flow control valve 7 and programmable logic controller.
The slurry tank 2 is communicated with the centrifuge 1.
The stirrer 3 is disposed in the slurry tank 2.
The slurry pump 4 communicates with the slurry tank 3.
At least two sulfur melting kettle mechanisms 5 are communicated with a slurry pump 4, and a stop valve is arranged at the communication position of each sulfur melting kettle mechanism of the at least two sulfur melting kettle mechanisms 5 and the slurry pump.
The flow meter 6 is arranged between the at least two sulfur melting kettle mechanisms 5 and the slurry pump 4.
The flow regulating valve 7 is arranged between the flow meter 6 and the at least two sulfur melting kettle mechanisms 5.
The programmable logic controller is connected with the centrifuge 1, the stirrer 3, the slurry pump 4, at least two sulfur melting kettle mechanisms 5, the flowmeter 6 and the flow regulating valve 7.
The programmable logic controller sends start-stop signals to the centrifuge 1, the stirrer 3, the slurry pump 4 and the at least two sulfur melting kettle mechanisms 5, receives alarm signals sent by the centrifuge 1, sends adjusting signals to the flow regulating valve 7 according to the alarm signals, sends flow signals to the programmable logic controller by the flowmeter 6, and sends control signals to the flow regulating valve 7 by the programmable logic controller.
In the embodiment of the application, the programmable logic controller sends a starting signal to the centrifuge 1, the centrifuge 1 separates the slurry in the desulfurization waste liquid and stores the slurry in the slurry tank 2, when the liquid level in the slurry tank 2 reaches a specified value, the programmable logic controller sends a starting signal to the stirrer 3, the stirrer 3 stirs the slurry in the slurry tank 2, the programmable logic controller sends a starting signal to the slurry pump 4, the slurry pump 4 conveys the slurry stirred in the slurry tank 2 to one of the at least two sulfur melting kettle mechanisms 5 through the flow meter 6 and the flow regulating valve 7, the flow meter 6 sends a flow signal to the programmable logic controller, the amount of the slurry loaded into the sulfur melting kettle mechanisms 5 is calculated according to the flow of the slurry, when the volume of the slurry reaches 80% of the volume in the sulfur melting kettle mechanisms 5, the charging is completed, the stop valve of one of the at least two sulfur melting kettle mechanisms 5 is closed, open the stop valve of another sulfur melting kettle mechanism of two at least sulfur melting kettle mechanisms 5, feed, the sulfur melting kettle mechanism of finishing of feeding heats, and after sulfur melting kettle mechanism heats up, discharge liquid sulfur, will retrieve the sulfur and handle as the desulfurization waste liquid, has reduced equipment investment cost when make full use of NNF method high desulfurization rate.
The structure of the slurry tank 2 will be described in detail.
And a liquid level detector 8 is arranged on the slurry tank 2, the liquid level detector 8 is connected with the programmable logic controller, and the liquid level detector 8 sends a liquid level signal to the programmable logic controller. The liquid level detector 8 is used for detecting the liquid level in the slurry tank 2, and when the centrifuge 1 is started and the slurry liquid level in the slurry tank 2 is higher than the blade height of the stirrer 3, the programmable logic controller sends a starting signal to the stirrer 3, so that the stirrer 3 is started; in the working process of the stirrer 3, when the liquid level of the slurry tank 2 is lower than the blade height of the stirrer 3 or is larger than the working range of the stirrer 3, the programmable logic controller sends a stop signal to the stirrer 3, the stirrer 3 stops in a linkage manner, and after 5 seconds of delay, the slurry pump 4 stops in a linkage manner.
The structure of the sulfur melter mechanism 5 will be described in detail.
The sulfur melting kettle mechanism 5 comprises: 5-1 parts of a sulfur melting kettle, 5-2 parts of a pressure regulating valve, 5-3 parts of a pressure detector, 5-4 parts of a temperature detector, 5-5 parts of a steam conveying pipe, 5-6 parts of a temperature regulating valve and 5-7 parts of a medium dissolving tank.
The sulfur melting kettle 5-1 is communicated with the slurry pump 4.
The pressure regulating valve 5-2 is communicated with the sulfur melting kettle 5-1.
The pressure detector 5-3 is communicated with the sulfur melting kettle 5-1.
The temperature detector 5-4 is communicated with the sulfur melting kettle 5-1.
The steam delivery pipe 5-5 is communicated with the sulfur melting kettle 5-1, and the steam delivery pipe 5-5 is provided with a temperature regulating valve 5-6.
The medium dissolving tank 5-7 is communicated with the sulfur melting kettle 5-1.
The pressure regulating valve 5-2, the pressure detector 5-3, the temperature detector 5-4 and the temperature regulating valve 5-6 are connected with the programmable logic controller, the programmable logic controller receives a pressure signal sent by the pressure detector 5-3, sends an opening and closing signal to the pressure regulating valve 5-2 according to the pressure signal, receives a temperature signal sent by the temperature detector 5-4, and sends a regulating signal to the temperature regulating valve 5-6 according to the temperature signal.
The structure of the flow rate adjustment valve 7 will be described in detail.
The flow regulating valve 7 comprises an upper regulator and a lower regulator, and the upper regulator and the lower regulator have cascade, automatic and manual working modes.
Based on the same inventive concept, the invention also provides a treatment control method for recovering sulfur from the coke oven gas desulfurization waste liquid, which comprises the following steps:
And step 2, when the liquid level in the slurry tank 2 reaches a specified value, the programmable logic controller sends a starting signal to the stirrer 3, and the stirrer 3 stirs the slurry in the slurry tank 2.
And 3, sending a starting signal to the slurry pump 4 by the programmable logic controller, and conveying the slurry stirred in the slurry tank 2 to one of the at least two sulfur melting kettle mechanisms 5 by the slurry pump 4 through the flow meter 6 and the flow regulating valve 7.
And 4, sending a flow signal to the programmable logic controller by the flowmeter 6, calculating the amount of the slurry filled into the sulfur melting kettle mechanisms 5 according to the flow of the slurry, completing the charging when the volume of the slurry reaches 80% of the volume of the sulfur melting kettle mechanisms 5, closing a stop valve of one sulfur melting kettle mechanism of the at least two sulfur melting kettle mechanisms 5, and opening a stop valve of the other sulfur melting kettle mechanism of the at least two sulfur melting kettle mechanisms 5 to charge.
And 5, heating the sulfur melting kettle mechanism 5 after charging, and discharging the liquid sulfur after the sulfur melting kettle mechanism 5 is heated.
Step 3 is described in detail.
An upper regulator and a lower regulator are arranged in the flow regulating valve 7, and the upper regulator and the lower regulator have cascade, automatic and manual working modes.
Referring to fig. 2, when the programmable logic controller is started, the flow regulating valve 7 first enters state a: the manual mode of the lower regulator is that the SP tracks PV and the MV outputs 0%; and in the manual mode of the upper regulator, the SP tracks the PV, the MV value is kept in the original state, the SP is a set value, the PV is a process value fed back by the instrument, and the MV is a valve position output value.
After the programmable logic controller is started, if the slurry flow detection is normal, the centrifuge runs and no alarm is given, the flow regulating valve 7 enters a state B: the manual mode of the lower regulator is that the SP tracks PV and the MV value is adjustable, the manual mode of the upper regulator is that the SP tracks PV and the MV value is kept in the original state.
After the flow regulating valve 7 enters the state B, if the conditions of normal slurry flow detection, centrifuge operation and no alarm are kept, the flow regulating valve 7 can be conditionally switched among the following states.
If the lower level regulator is switched to the automatic mode, the flow regulating valve 7 enters a state C: the automatic mode of the lower regulator, the PV tracking of the SP of the lower regulator, the original state of the MV value, the manual mode of the upper regulator, the PV tracking of the SP of the upper regulator and the MV tracking.
If the lower regulator remains in the automatic mode, the flow-regulating valve 7 enters the state D: the lower regulator is in an automatic mode, the lower regulator is in PID control and outputs MV values, and the upper regulator is in a manual mode, and the upper regulator SP tracks PV and MV.
If the lower regulator is kept in the automatic regulating mode, the slurry tank liquid level detection is normal, the upper regulator selects the automatic mode, and the regulating system enters the state E when the upper regulator and the lower regulator are arranged in cascade: the lower regulator cascade mode, the lower regulator PID control, the output MV value, the upper regulator automatic mode, the upper regulator SP tracking PV, the MV value keeping the original state.
If the lower regulator is kept in the cascade regulation mode, the slurry tank liquid level detection is normal, and the upper regulator is kept in the automatic mode, the regulation system enters a state F: the lower regulator cascade mode, the lower regulator PID control, the output MV value, the upper regulator automatic mode, the upper regulator PID control, the MV output to the lower SP value.
And when the flow regulating valve 7 is in the state of E or F, if the upper regulating meter and the lower regulating meter are disconnected in cascade or the liquid level detection of the slurry tank is abnormal, the flow regulating valve 7 enters the state of D.
In any state of C, D, E, F, if the lower level regulator selects the manual mode, or the slurry flow detection is abnormal or the running centrifuge gives an alarm, the flow regulating valve 7 enters the state G: the lower regulator manual mode, the SP tracking PV, the MV value keeping original state, the upper regulator manual mode, the upper regulator SP tracking PV, the MV value keeping original state, the flow regulating valve 7 in the G state if the lower regulator is kept in the manual mode, the flow regulating valve 7 enters the B state.
When the slurry flow is detected abnormally or the centrifuge stops running or the centrifuge gives an alarm, the flow regulating valve 7 enters the state A from the state C, D, E, F, G, and when the slurry flow is recovered to be normal, the flow regulating valve 7 automatically enters the state B from the state A and can be conditionally switched in the state C, D, E, F, G.
When the centrifuge 1 sends an alarm signal to the programmable logic controller, the programmable logic controller sends an adjusting signal to the flow regulating valve 7, the flow regulating valve 7 is in a G state, the output MV of the lower regulator is gradually reduced from the current output to 0.5-1 time of the current output within a fixed time T, T is 6-20 seconds, and then the output MV is adjusted to be manually operated.
When the centrifuge 1 is started and the slurry liquid level of the slurry tank 2 is higher than the blade height of the stirrer 3, the programmable logic controller sends a starting signal to the stirrer 3, and the stirrer 3 is started.
In the working process of the stirrer 3, when the liquid level of the slurry tank 2 is lower than the blade height of the stirrer 3 or is larger than the working range of the stirrer 3, the programmable logic controller sends a stop signal to the stirrer 3, the stirrer 3 stops in a linkage manner, and the slurry pump 4 stops in a linkage manner after 5 seconds of delay.
Step 4 is described in detail.
When the set charging amount of the sulfur melting kettle mechanism 5 is reached, the charging is stopped, and the programmable logic controller sends a heating signal to the sulfur melting kettle mechanism 5.
In the heating stage, the temperature in the sulfur melting kettle mechanism 5 is controlled to be 140-150 ℃, and the heating process is about 5-8 hours.
And simultaneously controlling the pressure in the sulfur melting kettle mechanism 5 in the heating process, wherein when the sulfur melting kettle mechanism 5 starts to heat, the pressure in the sulfur melting kettle mechanism 5 is 430Kpa-470Kpa and is kept for 4-6 hours, and the pressure in the sulfur melting kettle mechanism 5 is 150Kpa and is kept for 1-2 hours, so that the heating is finished.
In order to more clearly describe the embodiments of the present invention, the following description is made in terms of the method of using the embodiments of the present invention.
First, the required control hardware, software, ethernet, etc. are installed and configured.
(1) Installing a computer operating system and control software: the computer adopts a Siemens industrial personal computer and a Microsoft Windows 764 bit operating system, and the control software adopts programming software of Siemens PCS 78.1 SP1 version.
(2) Installing PLC hardware control equipment: the example adopts Siemens PLC control equipment of S7400H series which is adapted to the programming software of Siemens PCS 78.1 SP1 version.
(3) Setting a PLC module and a communication network: and (3) setting channels and parameters for PLC hardware, and detecting communication network connection by adopting a TCP communication mode for communication.
(4) Configuration programming software: and writing and testing a control program according to the control content.
(5) Configuration system process flow picture: the functions of controlling the field device, displaying the state and the like are realized.
(6) Signal proofreading: and after the field equipment is installed, verifying the field equipment through programming software to finish the signal loop test.
Then, carrying out automatic system programming on a desulfurization waste liquid recovery sulfur treatment system of a desulfurization system, and programming input and output signals of the system, wherein the specific implementation contents are as follows:
and programming software of Siemens PCS 78.1 SP1 version is used for realizing basic control functions of all equipment, realizing start-stop and regulation control of the equipment and completing function test.
Then, automatic system programming and configuration are carried out on the starting and running conditions of the automatic control method, and the specific implementation contents are as follows:
writing a logic judgment program, judging whether related equipment and instruments are normal, and respectively entering different regulation modes for processing. The sulfur melting kettle circulates in four stages according to the distribution degree. And controlling the sulfur melting kettle according to a heating curve when heating. The monitoring and control content of the flow picture is configured.
Finally, the sulfur recovered by the NNF method is treated as the desulfurization waste liquid.
The programmable logic controller sends a starting signal to the centrifuge 1, and the centrifuge 1 separates slurry in the desulfurization waste liquid generated by the NNF method and stores the slurry in the slurry tank 2.
When the liquid level in the slurry tank 2 reaches a specified value, the programmable logic controller sends a starting signal to the stirrer 3, the stirrer 3 stirs the slurry in the slurry tank 2, and when the centrifuge 1 is started and the slurry liquid level in the slurry tank 2 is higher than the blade height of the stirrer 3, the programmable logic controller sends a starting signal to the stirrer 3, and the stirrer 3 is started; in the working process of the stirrer 3, when the liquid level of the slurry tank 2 is lower than the blade height of the stirrer 3 or is larger than the working range of the stirrer 3, the programmable logic controller sends a stop signal to the stirrer 3, the stirrer 3 stops in a linkage manner, and the slurry pump 4 stops in a linkage manner after 5 seconds of delay.
The programmable logic controller sends a starting signal to the slurry pump 4, and the slurry pump 4 conveys the slurry stirred in the slurry tank 2 to one of the at least two sulfur melting kettle mechanisms 5 through the flowmeter 6 and the flow regulating valve 7.
The regulation mode of the flow regulating valve 7 is set.
When the programmable logic controller is started, the flow regulating valve 7 firstly enters a state A: the manual mode of the lower regulator is that the SP tracks PV and the MV outputs 0%; the upper regulator manual mode, SP tracking PV, the MV value remains in the original state (SP represents the set value of the flow rate for the lower regulator and the set value of the liquid level for the upper regulator, and similarly, PV represents the actually detected flow rate value (detected value of the flow meter) for the lower regulator and the actually detected liquid level value (detected value of the liquid level meter) for the upper regulator).
After the programmable logic controller is started, if the instrument control device is normal, the slurry flow is detected normally, the centrifuge runs and no alarm is given, the flow regulating valve 7 enters a state B: the manual mode of the lower regulator is that the SP tracks PV and the MV value is adjustable, the manual mode of the upper regulator is that the SP tracks PV and the MV value is kept in the original state.
After the flow regulating valve 7 enters the state B, if the instrument control device is kept normal, the slurry flow is detected normally, and the centrifuge runs without an alarm, the flow regulating valve 7 can be switched conditionally between the following states.
If the lower level regulator is switched to the automatic mode, the flow regulating valve 7 enters a state C: the lower regulator is in an automatic mode, the lower regulator SP tracks PV, and the MV value is kept in an original state. And the upper regulator adopts a manual mode, and the upper regulator SP tracks PV and MV.
If the lower regulator remains in the automatic mode, the flow-regulating valve 7 enters the state D: the lower regulator is in an automatic mode, and the lower regulator is controlled by PID and outputs an MV value. And the upper regulator adopts a manual mode, and the upper regulator SP tracks PV and MV.
If the lower regulator is kept in the automatic regulating mode, the slurry tank liquid level detection is normal, the upper regulator selects the automatic mode, and the flow regulating valve 7 enters the state E when the upper regulator and the lower regulator are arranged and cascaded: and the lower regulator is in a cascade mode, and the lower regulator is controlled by PID and outputs an MV value. And the upper regulator is in an automatic mode, the upper regulator SP tracks PV, and the MV value is kept in an original state.
If the lower regulator is kept in the cascade regulation mode, the slurry tank liquid level detection is normal, and the upper regulator is kept in the automatic mode, the regulation system enters a state F: and the lower regulator is in a cascade mode, and the lower regulator is controlled by PID and outputs an MV value. The upper regulator is in an automatic mode, the upper regulator is controlled by PID, and MV is output to a lower SP value.
And when the flow regulating valve 7 is in the E state or the F state, if the upper regulating meter and the lower regulating meter are disconnected in cascade connection or the liquid level detection of the slurry tank is abnormal, the flow regulating valve 7 enters the D state.
In any state of C, D, E, F, if the lower level regulator selects the manual mode, or the slurry flow detection is abnormal or the running centrifuge gives an alarm, the flow regulating valve 7 enters the state G: the manual mode of the lower regulator, SP track PV, MV value keeps the original state, the manual mode of the upper regulator, SP track PV, MV value keeps the original state. The flow rate adjustment valve 7 in the G state if the lower level regulator is kept in the manual mode, the flow rate adjustment valve 7 enters the B state.
When the instrument control device is abnormal or the slurry flow detection is abnormal or the centrifuge stops running or the centrifuge gives an alarm, the flow regulating valve 7 enters the state A from the state C, D, E, F, G. When the flow regulating valve 7 returns to normal from the abnormal state, the flow regulating valve 7 automatically enters the state B from the state a, and can be conditionally switched at the state C, D, E, F, G.
When the centrifuge 1 sends an alarm signal to the programmable logic controller, the programmable logic controller sends an adjusting signal to the flow regulating valve 7, the flow regulating valve 7 is in a G state, the output MV of the lower regulator is gradually reduced from the current output to 0.5-1 time of the current output within a fixed time T, T is 6-20 seconds, and then the output MV is adjusted to be manually operated.
When the flow of the desulfurization waste liquid at the inlet of the centrifuge 1 fluctuates, the rotating speed of the centrifuge 1 also changes, so that the flow of the slurry entering the slurry tank 2 also fluctuates. To ensure that the slurry tank 2 level is stable, this fluctuation is taken into account as a feed forward in the programmable logic controller. When the centrifuge 1 is started and the liquid level of the slurry tank 2 is more than 0.5 m (the liquid level of the slurry is higher than the blade height of the stirrer 3), the stirrer 3 of the slurry tank 2 is automatically started; in the working process of the stirrer 3, when the liquid level of the slurry tank 2 is less than 0.4 meter (lower than the height of blades of the stirrer 3) or more than 1.8 meters (larger than the working range of the stirrer 3), the stirrer of the slurry tank 2 is in linkage stop, and after 5 seconds of delay, the slurry pump 4 is in linkage stop. When the liquid level of the slurry tank 2 is less than 0.4 m, the slurry pump 4 is stopped in a linkage manner in order to prevent the inlet of the slurry pump 4 from cutting off.
The flow meter 6 sends a flow signal to the programmable logic controller, calculates the amount of the slurry filled into the sulfur melting kettle mechanism 5 according to the flow of the slurry, finishes charging when the slurry reaches 80% of the internal volume of the sulfur melting kettle mechanism 5, closes the stop valve of one sulfur melting kettle mechanism of at least two sulfur melting kettle mechanisms 5, opens the stop valve of the other sulfur melting kettle mechanism of at least two sulfur melting kettle mechanisms 5, and charges.
The stop valve can be a manual stop valve and operated manually on site, and can also be an electromagnetic valve, is connected with the programmable logic controller, receives an opening and closing signal sent by the programmable logic controller and is opened and closed.
In order to improve the production capacity, two intermittent sulfur melting kettles 5-1 are arranged, and the working state of each sulfur melting kettle 5-1 is divided into four states of charging, heating, discharging and waiting. The two sulfur melting tanks cannot be charged simultaneously, but can be heated or discharged simultaneously. While one sulfur melting pot 5-1 is in a charged state, the other sulfur melting pot 5-1 is in a heated or discharged or waiting state.
The programmable logic controller calculates the charging amount in the sulfur melting kettle 5-1 in real time according to the flow rate of the slurry, automatically stops charging when the set charging amount is reached, and automatically shifts to a heating stage. The sulfur melting kettle mechanism 5 after the charging is heated, and in the heating stage, the programmable logic controller receives a temperature signal sent by the temperature detector 5-4 and sends an adjusting signal to the temperature adjusting valve 5-6 according to the temperature signal, so that the temperature in the sulfur melting kettle 5-1 is controlled to be about 140 ℃ to 150 ℃, and the heating process lasts for about 5-8 hours. In the heating process, the programmable logic controller receives a pressure signal sent by the pressure detector 5-3, sends an opening and closing signal to the pressure regulating valve 5-2 according to the pressure signal, controls the pressure in the sulfur melting kettle 5-1 through the pressure regulating valve 5-2, when the sulfur melting kettle 5-1 starts to heat, the pressure regulating valve 5-2 regulates the pressure in the kettle to be 450Kpa (the pressure is adjustable between 430Kpa and 470 Kpa), keeps for 4-6 hours (the time can be adjusted and the residual time is displayed), then the pressure in the kettle is adjusted to be 150Kpa (the pressure can be adjusted), keeps for 1-2 hours (the time can be adjusted and the residual time is displayed), and the heating is displayed to be completed after the whole process is finished. If no sulfur is discharged after heating is finished, the opening degree of the regulating valve is kept unchanged. After the heating, the liquid sulfur discharge operation is performed manually.
After the sulfur melting kettle 5-1 is heated, liquid sulfur is discharged into the medium dissolving tank 5-7, the high desulfurization rate of the NNF method is fully utilized, and the equipment investment cost is reduced.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A coke oven gas desulfurization waste liquid recovery sulfur treatment control device is characterized by comprising:
a centrifuge (1);
a slurry tank (2) which is communicated with the centrifuge (1);
a stirrer (3) arranged in the slurry tank (2);
the slurry pump (4) is communicated with the slurry tank (3);
the sulfur melting kettle mechanisms (5) are communicated with the slurry pump (4), and a stop valve is arranged at the communication position of each sulfur melting kettle mechanism in the sulfur melting kettle mechanisms (5) and the slurry pump (4);
the flowmeter (6) is arranged between the at least two sulfur melting kettle mechanisms (5) and the slurry pump (4);
the flow regulating valve (7) is arranged between the flowmeter (6) and the at least two sulfur melting kettle mechanisms (5);
the programmable logic controller is connected with the centrifuge (1), the stirrer (3), the slurry pump (4), the at least two sulfur melting kettle mechanisms (5), the flow meter (6) and the flow regulating valve (7);
the system comprises a programmable logic controller, a stirrer (3), a slurry pump (4), at least two sulfur melting kettle mechanisms (5), a flow regulating valve (7), a flow meter (6), a flow control valve (7), a flow control valve (5), a flow control valve (3), a flow controller and a controller, wherein the programmable logic controller sends start and stop signals to the centrifuge (1), the stirrer (3), the slurry pump (4) and the at least two sulfur melting kettle mechanisms (5);
the sulfur melting kettle mechanism comprises:
the sulfur melting kettle (5-1) is communicated with the slurry pump (4);
the pressure regulating valve (5-2) is communicated with the sulfur melting kettle (5-1);
the pressure detector (5-3) is communicated with the sulfur melting kettle (5-1);
the temperature detector (5-4) is communicated with the sulfur melting kettle (5-1);
the steam conveying pipe (5-5) is communicated with the sulfur melting kettle (5-1), and a temperature adjusting valve (5-6) is arranged on the steam conveying pipe (5-5);
the medium dissolving tank (5-7) is communicated with the sulfur melting kettle (5-1);
the pressure regulating valve (5-2), the pressure detector (5-3), the temperature detector (5-4) and the temperature regulating valve (5-6) are connected with the programmable logic controller, the programmable logic controller receives a pressure signal sent by the pressure detector (5-3), sends an opening and closing signal to the pressure regulating valve (5-2) according to the pressure signal, receives a temperature signal sent by the temperature detector (5-4), and sends a regulating signal to the temperature regulating valve (5-6) according to the temperature signal.
2. The device for treating and controlling the sulfur recovery from the coke oven gas desulfurization waste liquid according to claim 1, characterized in that:
and a liquid level detector (8) is arranged on the slurry tank (2), the liquid level detector (8) is connected with the programmable logic controller, and the liquid level detector (8) sends a liquid level signal to the programmable logic controller.
3. The device for treating and controlling the sulfur recovery from the coke oven gas desulfurization waste liquid according to claim 1, characterized in that:
the flow regulating valve (7) comprises an upper regulator and a lower regulator, and the upper regulator and the lower regulator have cascade, automatic and manual working modes.
4. A treatment control method for recycling sulfur from coke oven gas desulfurization waste liquid is applied to the treatment control device for recycling sulfur from coke oven gas desulfurization waste liquid as claimed in claim 1, and is characterized by comprising the following steps:
the programmable logic controller sends a starting signal to the centrifuge (1), and the centrifuge (1) separates slurry in the desulfurization waste liquid and stores the slurry in the slurry tank (2);
when the liquid level in the slurry tank (2) reaches a specified value, the programmable logic controller sends a starting signal to the stirrer (3), and the stirrer (3) stirs the slurry in the slurry tank (2);
the programmable logic controller sends a starting signal to a slurry pump (4), and the slurry pump (4) conveys the slurry stirred in the slurry tank (2) to one of at least two sulfur melting kettle mechanisms (5) through a flow meter (6) and a flow regulating valve (7);
the flow meter (6) sends a flow signal to the programmable logic controller, the amount of the slurry filled into the sulfur melting kettle mechanism (5) is calculated according to the slurry flow, when the slurry reaches 80% of the inner volume of the sulfur melting kettle mechanism (5), the charging is completed, the stop valve of one sulfur melting kettle mechanism of at least two sulfur melting kettle mechanisms (5) is closed, and the stop valve of the other sulfur melting kettle mechanism of at least two sulfur melting kettle mechanisms (5) is opened for charging;
and heating the sulfur melting kettle mechanism (5) after the charging is finished, and discharging the liquid sulfur after the heating of the sulfur melting kettle mechanism (5) is finished.
5. The treatment control method for recovering sulfur from the coke oven gas desulfurization waste liquid according to claim 4, characterized by comprising the following steps:
an upper regulator and a lower regulator are arranged in the flow regulating valve (7), and the upper regulator and the lower regulator have cascade, automatic and manual working modes.
6. The treatment control method for recovering sulfur from the coke oven gas desulfurization waste liquid according to claim 5, characterized by comprising the following steps:
when the programmable logic controller is started, the flow regulating valve (7) firstly enters a state A: the lower regulator is in a manual mode, the SP tracks PV, and MV is output by 0%; in the manual mode of the upper regulator, the SP tracks PV, the MV value is kept in the original state, the SP is a set value, the PV is a process value fed back by the instrument, and the MV is a valve position output value;
after the programmable logic controller is started, if the slurry flow detection is normal, the centrifuge runs and no alarm is given, the flow regulating valve (7) enters a state B: the lower regulator manual mode is characterized in that the SP tracks PV, the MV value is adjustable, the upper regulator manual mode is characterized in that the SP tracks PV, and the MV value is kept in the original state;
after the flow regulating valve enters the state B, if the conditions of normal slurry flow detection, centrifuge operation and no alarm are kept, the flow regulating valve (7) can be switched conditionally among the following states;
if the lower level regulator is switched to the automatic mode, the flow regulating valve (7) enters a state C: the lower regulator is in an automatic mode, the lower regulator SP tracks PV, MV values are kept in an original state, the upper regulator is in a manual mode, and the upper regulator SP tracks PV and MV;
-if the lower regulator remains in automatic mode the flow regulating valve (7) enters state D: the lower regulator is in an automatic mode, the lower regulator is in PID control and outputs an MV value, and the upper regulator is in a manual mode, and the upper regulator SP tracks PV and MV;
if the lower regulator is kept in an automatic regulation mode, the slurry tank liquid level detection is normal, the upper regulator selects the automatic mode, and the regulation system enters a state E when the upper regulator and the lower regulator are arranged in cascade: the lower regulator cascade mode, the lower regulator PID control, outputs MV value, the upper regulator automatic mode, the upper regulator SP tracks PV, MV value keeps original state;
if the lower regulator is kept in the cascade regulation mode, the slurry tank liquid level detection is normal, and the upper regulator is kept in the automatic mode, the regulation system enters a state F: the lower regulator cascade mode, the lower regulator PID control and the upper regulator automatic mode output MV values, and the upper regulator PID control and the MV values are output to the lower SP value;
when the flow regulating valve (7) is in an E or F state, if the upper regulating meter and the lower regulating meter are disconnected in cascade connection or the liquid level detection of the slurry tank is abnormal, the flow regulating valve (7) enters a D state;
in any state of C, D, E, F, if the lower level regulator selects a manual mode, or slurry flow detection is abnormal or an alarm occurs in a running centrifuge, the flow regulating valve (7) enters a G state: the lower regulator manual mode, SP tracking PV, MV value keeping original state, the upper regulator manual mode, the upper regulator SP tracking PV, MV value keeping original state, the flow regulating valve (7) in G state if the lower regulator is kept in manual mode, the flow regulating valve enters B state;
when the slurry flow is detected abnormally or the centrifuge stops running or the centrifuge alarms, the flow regulating valve (7) enters the A state from the C, D, E, F, G state, and when the flow regulating valve (7) returns to the normal state, the flow regulating valve automatically enters the B state from the A state and can be conditionally switched at the C, D, E, F, G state.
7. The treatment control method for recovering sulfur from the coke oven gas desulfurization waste liquid according to claim 6, characterized by comprising the following steps:
when the centrifuge (1) sends an alarm signal to the programmable logic controller, the programmable logic controller sends a regulation signal to the flow regulating valve (7), the flow regulating valve (7) is in a G state, the output MV of the lower regulator is gradually reduced from the current output to 0.5-1 time of the current output within a fixed time T, wherein T is 6-20 seconds, and then the output MV is regulated and can be manually operated.
8. The treatment control method for recovering sulfur from the coke oven gas desulfurization waste liquid according to claim 5, characterized by comprising the following steps:
when the centrifuge (1) is started and the slurry liquid level of the slurry tank (2) is higher than the blade height of the stirrer (3), the programmable logic controller sends a starting signal to the stirrer (3), and the stirrer (3) is started;
in the working process of the stirrer (3), when the liquid level of the slurry tank (2) is lower than the blade height of the stirrer (3) or larger than the working range of the stirrer (3), the programmable logic controller sends a stop signal to the stirrer (3), the stirrer (3) stops in a linkage manner, and after 5 seconds of delay, the slurry pump (4) stops in a linkage manner.
9. The treatment control method for recovering sulfur from the coke oven gas desulfurization waste liquid according to claim 5, characterized by comprising the following steps:
when the set charging amount of the sulfur melting kettle mechanism (5) is reached, stopping charging, and sending a heating signal to the sulfur melting kettle mechanism (5) by the programmable logic controller;
in the heating stage, the temperature in the sulfur melting kettle mechanism (5) is controlled to be 140-150 ℃, and the heating process is about 5-8 hours;
and simultaneously controlling the pressure in the sulfur melting kettle mechanism (5) in the heating process, wherein when the sulfur melting kettle mechanism (5) starts to heat, the pressure in the sulfur melting kettle mechanism (5) is 430Kpa-470Kpa, keeping for 4-6 hours, and the pressure in the sulfur melting kettle mechanism (5) is 150Kpa, keeping for 1-2 hours, so that the heating is finished.
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| CN1803588A (en) * | 2005-01-11 | 2006-07-19 | 宜宾天蓝化工有限责任公司 | Phosphoric acid production system |
| CN202346764U (en) * | 2011-11-07 | 2012-07-25 | 南京钢铁股份有限公司 | Device for recovering sulfur in desulfuration waste liquid |
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| US20020094308A1 (en) * | 2001-01-12 | 2002-07-18 | Portz Bruce Dean | Process and apparatus for processing hydrogen sulfide from a gas |
| US7311891B2 (en) * | 2005-03-09 | 2007-12-25 | Basf Catalysts Llc | Process for the recovery of sulfur from Claus tail gas streams |
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| CN1803588A (en) * | 2005-01-11 | 2006-07-19 | 宜宾天蓝化工有限责任公司 | Phosphoric acid production system |
| CN202346764U (en) * | 2011-11-07 | 2012-07-25 | 南京钢铁股份有限公司 | Device for recovering sulfur in desulfuration waste liquid |
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