CN111320993A - Automatic coke cooling process method and control for coke tower - Google Patents
Automatic coke cooling process method and control for coke tower Download PDFInfo
- Publication number
- CN111320993A CN111320993A CN202010189262.2A CN202010189262A CN111320993A CN 111320993 A CN111320993 A CN 111320993A CN 202010189262 A CN202010189262 A CN 202010189262A CN 111320993 A CN111320993 A CN 111320993A
- Authority
- CN
- China
- Prior art keywords
- coke
- cold
- water
- tower
- cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/04—Wet quenching
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention relates to an automatic coke cooling process method and control for a coke tower. The method comprises the following steps of (1) carrying out contact cooling on coke in a coke tower by taking steam and cold coke cold water as cooling media, carrying out closed treatment on emptying oil gas generated in the coke cooling process by adopting an emptying tower, and reducing the cold coke drainage temperature of cold coke hot water discharged in the coke cooling process by adopting a measure of mixing cold coke cold water; and controlling related valves and equipment by a logic automatic control system according to the parameters of temperature, pressure, time, flow and the like of materials entering and leaving the coke tower in the coke cooling process. The invention combines the cold coke hot water tank and the cold coke cold water tank into a whole and reduces the drainage temperature, thereby not only reducing the water consumption but also avoiding the pollution of waste gas in the cold coke process; the full automation of the coke cooling process of the coke tower is realized through logic control, the safety level of the coke cooling process is improved, and the labor intensity is reduced.
Description
Technical Field
The invention relates to an automatic coke cooling process method and control for a coke tower, in particular to a process method and process automatic control for cooling coke in a coke tower of a delayed coking device of an oil refinery by using steam and water.
Background
The delayed coking is one of the main processes for heavy oil conversion, and the delayed coking equipment is characterized by that it adopts continuous production and intermittent operation, and usually one heating furnace is correspondent to two parallelly-connected coke towers, and the heating furnace is continuously operated, and the coke towers are intermittently switched over, one tower is used for feeding raw coke, another tower is used for cold coke decoking, and two coke towers are switched over once for 18-24 hr. The coke cooling and decoking of the coke tower means that after the coke in one coke tower reaches a certain height, the feeding is switched to the other coke tower, the coke tower cools the coke to a proper temperature by adopting a steam blowing and water feeding coke cooling mode, then the water in the coke tower is discharged, an upper cover machine on a coke drilling port on the top of the coke tower and a lower cover machine below a coke outlet on the bottom of the coke tower are opened, and the high-pressure water is adopted for decoking. The coke cooling operation mainly comprises the steps of steam blowing, water supply, coke cooling, water drainage and the like. Steam is blown into the coke tower from the bottom of the coke tower to strip oil gas in the coke, so that the coke is cooled and a multi-gap structure is formed, and the subsequent coke cooling is facilitated; the water feeding and coke cooling process is to cool the coke to a proper temperature by injecting water so as to solidify the coke and avoid spontaneous combustion in the coke cutting process; and water discharging is to discharge accumulated water in the tower from the bottom of the coke tower after the coke is cooled to a proper temperature. The coke tower top overflow water and the tower bottom discharge water in the later stage of water supply coke cooling are collectively called coke cooling hot water, and the coke cooling hot water needs to be treated and recycled so as to reduce the discharge of steam and pollutants and the consumption of water in the coke cooling and water discharging processes as much as possible. The coke cooling process of the coke tower is mainly embodied in the process flow and the operation method of steam blowing and water feeding, and the treatment of waste gas and waste water, because the coke tower and the coke in the coke tower just after switching are high in temperature (about 430 ℃) and contain oil gas, the service life of the coke tower is influenced by too fast cooling, the generated waste gas is too large to be effectively treated, and the switching time period of the coke tower is influenced by too slow cooling, so that the residual oil treatment capacity of the device is influenced. Therefore, the time node, the introducing time and the introducing flow of the steam and the water must be reasonably controlled, and the waste gas and the waste water generated in the coke cooling process must be timely and effectively treated and recycled to meet the requirements of coke cooling operation, ensure the safe long-period operation of equipment and realize the environment-friendly production.
The conventional coke cooling process flow of the coke tower is shown in figure 1, and the operation process and control of the conventional coke cooling process of the coke tower are described in the following with reference to figure 1. Firstly, whether the coke tower meets the cold coke condition or not is judged manually through parameters such as valve switch states displayed by other operating systems of the coke tower, the feeding temperature of the coke tower and the like, and whether the operation of an emptying tower B, a liquid separating tank C, an emptying tower top air cooler E1, an emptying tower bottom air cooler E2 and an emptying tower bottom pump G1 is normal or not is observed through a DCS control system. If the above conditions are satisfied, the coke cooling operation is started.
Step 1 of cold coke operation: opening an emptying oil and gas cut-off valve V and closing an oil and gas cut-off valve W of the fractionating tower at the same time, and changing the original oil and gas 110 entering the fractionating tower into an emptying tower B; manually opening a steam stop valve Q, adjusting a cold coke steam adjusting valve N3 to reach proper cold coke steam flow through an instrument control system DCS, and maintaining a period of steam cold coke time according to operation experience; cold coke steam 102 enters a coke tower A, coke 101 is cooled and stripped, produced emptying oil steam 104 flows out from the top of the coke tower to an emptying tower B, countercurrent heat exchange is carried out in the emptying tower and heavy dirty oil 114 reflowing from the upper part, the washed and cooled dirty oil and reflowing heavy dirty oil enter the bottom of the tower together, a part of the heavy dirty oil 114 cooled by an emptying tower bottom air cooler E2 is pumped out by an emptying tower bottom pump G1 to the top of the tower to be used as reflux, and the other part of the heavy dirty oil is sent out of the device as heavy dirty oil; and the gas at the top of the emptying tower is condensed and cooled by an emptying tower top air cooler E1 and enters a three-phase separator C, and the separated gas 111, light dirty oil 112 and oily sewage 113 are respectively sent out of the device.
Step 2 of cold coke operation: according to the operation experience and the arrangement of a coke-forming period, a cold coke cold water pump G2 is started, cold coke cold water of a cold coke cold water tank D1 is pumped, the flow of the pump is automatically controlled through a minimum flow control valve J1 of the pump, then a cold coke cold water stop valve R is manually opened, the amount of cold coke cold water 103 entering a coke drum is regulated by two cold coke cold water regulating valves N1 and N2, in order to avoid water hammer of a coke drum feeding pipeline, the cold coke cold water amount should be slowly increased and cannot be too large, a cold coke cold water regulating valve is firstly opened, and a steam stop valve Q is closed after the cold coke cold water enters the coke drum is manually confirmed. Cold coke cold water 103 enters a coke tower A to cool coke 101, generated emptying oil steam 104 flows out from the top of the coke tower to an emptying tower B, countercurrent heat exchange is carried out in the emptying tower and heavy dirty oil 114 reflowing from the upper part, the washed and cooled dirty oil and reflowing heavy dirty oil enter the bottom of the tower together, a part of the heavy dirty oil 114 cooled by an emptying tower bottom air cooler E2 is pumped out by an emptying tower bottom pump G1 to the top of the tower to be used as reflux, and the other part of the heavy dirty oil is sent out of the device as heavy dirty oil; and the gas at the top of the emptying tower is condensed and cooled by an emptying tower top air cooler E1 and enters a three-phase separator C, and the separated gas 111, light dirty oil 112 and oily sewage 113 are respectively sent out of the device.
Step 3 of cold coke operation: an operator observes the temperature and the pressure at the top of the coke tower, the flow of cold coke cold water is adjusted through two cold coke cold water adjusting valves N1 and N2, the water quantity is reduced when the pressure at the top of the coke tower rises to a set value, the water quantity is increased when the pressure at the top of the coke tower drops below the set value, manual adjustment operation is carried out, the adjusting valve can be opened to supply water quickly until the temperature at the top of the coke tower reaches about 200 ℃ and the pressure at the top of the coke tower is not increased, the water level in the coke tower is judged through the level gauge L, when the water level in the coke tower reaches an upper limit, the water quantity of the cold coke water is properly reduced, the overflow hot water stop valve U is opened and the air-release oil steam stop valve V is closed.
Step 4 of coke cooling operation: after about 2 hours of calculation of the overflow from the coke cooling water, observing that the temperature of the top of the coke tower reaches about 90 ℃, closing a coke cooling cold water cut-off valve R, stopping a coke cooling cold water pump G2, then opening a balance gas cut-off valve Y, discharging balance gas 109 generated by preheating coke 101 to the atmosphere through a silencer H, and then closing an overflow hot water cut-off valve U.
Step 5 of cold coke operation: opening a coke drum hot water discharge cut-off valve S, enabling discharged hot water 106 to automatically flow from a coke drum A to a cold coke hot water tank D2, enabling balance gas 109 to enter the coke drum through a silencer H to balance the pressure in the coke drum when the discharged hot water 106 is discharged from the coke drum A, determining the time from the beginning of water discharge to the water drainage according to operation experience, confirming the completion of the water discharge in the coke drum after the water drainage time reaches the preset time, and closing the coke drum hot water discharge cut-off valve S.
Step 6 of coke cooling operation: starting the cold coke water air cooler E3 and the cold coke hot water pump G3, and the cold coke hot water 107 of the cold coke hot water tank D2, under the flow control of the regulating valve K, the cold coke hot water is conveyed to the cold coke water air cooler E3 by the pump to be cooled into cold coke cold water 108, the cold coke cold water 108 enters the cold coke cold water tank D1 to be stored for the next use of cold coke, and when the liquid level L of the cold coke cold water tank is lower, fresh water 115 is automatically supplemented into the tank through a fresh water supplementing regulating valve J2.
From the above, the conventional coke drum coke cooling process and control have the following problems:
firstly, many valves are operated manually, the situational awareness of people is easy to make mistakes, and if the valves are not opened according to the requirements and the sequence, safety accidents are easy to cause.
Secondly, the coke cooling operation steps are more, the technological process is complex, the valve is manually opened and closed by operators, the labor intensity is higher, and the working efficiency is low.
Thirdly, a cold coke hot water tank and a cold coke cold water tank are respectively arranged, so that the investment and the occupied area are large.
And fourthly, the overflow hot water and the discharged hot water are directly sent to a cold coke hot water tank, the volatilization amount of water in the tank is large, the water loss is caused, and sulfur and hydrocarbon substances contained in the volatilized steam pollute the environment.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a coke cooling process method of a coke tower with only one coke cooling water tank and an automatic control system, so as to realize one-key automatic coke cooling of coke tower coke cooling. Specifically, steam and cold coke cold water are used as cooling media to carry out contact cooling on coke in a coke tower, emptying oil gas generated in the coke cooling process is subjected to sealing treatment by adopting an emptying tower, and cold coke hot water discharged in the coke cooling process is mixed with cold coke cold water to reduce the cold coke drainage temperature and reduce the waste gas discharge; according to the parameters of temperature, pressure, time, flow and the like of materials entering and exiting from the coke tower in the coke cooling process, relevant valves and equipment are controlled through a logic automatic control system, and the full automation of the coke cooling process of the coke tower is realized.
Steam is 1.0MPa steam of a refinery pipe network, and cold coke cold water is fresh water which is hermetically recycled in the cold coke process; the emptying tower is subjected to sealing treatment, namely emptying oil vapor is absorbed, condensed and cooled in the tower through return oil, heavy oil at the bottom of the tower is sent out of the device after being cooled, gas at the top of the tower is further cooled and then is separated out through a separation tank to be sent to a low-pressure gas pipe network, and separated light dirty oil and sewage are sent out of the device; the coke cooling water tank is arranged for reducing the coke cooling water discharge temperature, and the coke cooling overflow hot water and the hot water discharged from the bottom of the coke tower are mixed in front of the coke cooling water tank to discharge cooling water so as to reduce the operating temperature of the coke cooling water tank; the coke in the coke tower is cooled by contact, oil gas in a steam stripping coke gap forms a pore, then cold coke cold water exchanges heat with the coke, the cold coke cold water permeates into the coke pore, and the coke is cooled by latent heat of gasification and sensible heat of temperature rise of the cold coke cold water; the oil gas at the top of the coke tower is the mixed gas of steam and oil gas which is generated when the coke is cooled and flows out from the top of the coke tower; the set coke cooling time and coke cooling medium flow are the time for introducing steam and the time for introducing cold coke cold water into the coke drum, which are specified according to the operation cycle of the coke drum, and the steam flow and the cold coke cold water flow are controlled according to the time, the temperature and the pressure at the top of the coke drum; the logic automatic control system is used for carrying out logic judgment according to parameters such as temperature, pressure, liquid level, flow, time and the like and according to set values, automatically and sequentially switching on and off and adjusting related valves, and starting and stopping related equipment; the related valves and devices refer to a stop valve, a regulating valve, an air cooler and a pump related to the coke cooling process.
An automatic coke cooling process method and control of a coke tower comprises the steps of mixing cold coke cold water and cooling before cold coke hot water enters a cold coke water tank, so that the environmental pollution is reduced, and the deformation of the tank caused by steam quenching is avoided; the logic automatic control system is composed of logic control program software, a controller and operation panel hardware, and the control system adopts DCS or PLC. The logic control program is that when the steam passing condition is met and the time point of introducing steam is reached, the emptying oil-steam stop valve and the steam stop valve are opened in sequence, the cold coke steam regulating valve is regulated according to the steam flow set value, when the steam passing condition is met and the time point of introducing cold coke cold water is reached, the cold coke water pump is started in sequence, the minimum flow control valve is put into use, the cold coke cold water stop valve is opened, and the cold coke cold water regulating valve is regulated according to the cold coke cold water flow set value. And after the cold coke cold water flow reaches a certain set value, closing the cold coke steam regulating valve and the steam stop valve in sequence. The logic control program is to automatically combine and adjust the small cold coke cold water regulating valve and the large cold coke cold water regulating valve to gradually and automatically increase the flow set value of the cold coke cold water according to 1-5 tons/minute on the basis of a certain flow set value, simultaneously detect the pressure at the top of the coke tower, gradually and automatically reduce the flow set value of the cold coke cold water according to 2-10 tons/minute when the pressure at the top of the coke tower reaches the set value, and gradually and automatically increase the flow set value of the cold coke cold water according to 1-5 tons/minute when the pressure at the top of the coke tower is lower than the set value. The logic control program is that when the water level in the coke tower reaches the specified position, the cold coke cold water regulating valve is automatically set to have smaller flow, the overflow hot water stop valve is automatically opened and the emptying oil and steam stop valve is closed at the same time, the air cooler is started, the drainage cooling water stop valve is opened, the overflow hot water at the top of the tower and the drainage cooling water are mixed, and the drainage cooling water amount is automatically adjusted according to the temperature of the mixed cold coke water. The logic control program is that when the temperature of the top of the coke tower reaches the specified value, the cold coke cold water stop valve and the cold coke cold water regulating valve are automatically closed, the balance gas stop valve and the overflow hot water stop valve are automatically opened in sequence, water is ready to be discharged, the hot water discharge stop valve is opened, the discharged hot water and the discharged water cooling water are mixed, the discharged water cooling water quantity is automatically regulated according to the mixed cold coke water temperature, when the discharged water cooling water and the mixed cold coke water temperature are basically consistent, the water discharging is finished, the hot water discharge stop valve, the air stop cooler and the cold coke water stop pump are closed, and the coke cooling is finished. The logic control equipment mainly comprises a cold coke cold water tank, an air cooler, a pump, a valve and the like.
Drawings
FIG. 1 is a schematic diagram of a conventional coke drum coke cooling process flow;
FIG. 2 is a schematic diagram of a coke drum cold coking process of the present invention.
In fig. 1:
equipment: a, a coke tower; b, emptying the tower; a C three-phase separator; d1 cold coke cold water tank; d2 cold coke hot water tank; e1 emptying the overhead air cooler; e2 venting the bottom air cooler; e3 coke cooling water air cooler; f, a flow meter; g1 emptying the tower bottom pump; g2 cold coke cold water pump; g3 cold coke hot water pump; an H silencer; j1 pump minimum flow control valve; j2 replenishment fresh water regulating valve; k coke cooling hot water regulating valve; l level or level indicator; an M motor; n1 cold coke cold water regulating valve; n2 cold coke cold water regulating valve; n3 cold coke steam regulating valve; a P pressure gauge; a Q steam cut-off valve; r is a cold coke cold water cut-off valve; s discharging a thermal cut-off valve; a T thermometer; a U overflow hot water cut-off valve; v, emptying an oil and gas cut-off valve; w is sent to an oil gas cut-off valve of the fractionating tower; y balanced gas shutoff valve.
Logistics: 101 of coke; 102 steam; 103 cold coke cold water; 104, emptying oil vapor; 105 overflowing the hot water; 106 discharging the hot water; 107 cold coke hot water; 108 cold coke cold water; 109 balance gas; 110 fractionation tower oil gas; 111 gas; 112 light dirty oil; 113 oily sewage; 114 heavy dirty oil; 115 fresh water.
In fig. 2:
equipment: a, a coke tower; b, emptying the tower; a C three-phase separator; d1 cold coke cold water tank; e1 emptying the overhead air cooler; e2 venting the bottom air cooler; e3 water discharge cooling water air cooler; f, a flow meter; g1 emptying the tower bottom pump; g2 cold coke cold water pump; an H silencer; i, an intelligent controller; j1 pump minimum flow control valve; j2 replenishment fresh water regulating valve; k, a drain cooling water regulating valve; l level or level indicator; an M motor; n1 cold coke cold water regulating valve; n2 cold coke large cold regulating valve; n3 cold coke steam regulating valve; an O mixer; a P pressure gauge; a Q steam cut-off valve; r is a cold coke cold water cut-off valve; s discharging a thermal cut-off valve; a T thermometer; a U overflow hot water cut-off valve; v, emptying an oil and gas cut-off valve; w is sent to an oil gas cut-off valve of the fractionating tower; an X drainage cooling water cut-off valve; y balanced gas shutoff valve.
Logistics: 101 of coke; 102 steam; 103 cold coke cold water; 104, emptying oil vapor; 105 overflowing the hot water; 106 discharging the hot water; 107 draining cooling water; 108 cold coke cold water; 109 balance gas; 110 fractionation tower oil gas; 111 gas; 112 light dirty oil; 113 oily sewage; 114 heavy dirty oil; 115 fresh water.
Detailed Description
The present invention is described in further detail below with reference to fig. 2.
As shown in fig. 2, the intelligent controller I is a control system integrating control logic software and control hardware, and the controlled devices and valves mainly include a drain cooling water air cooler E3, a cold coke cold water pump G2, a drain cooling water regulating valve K, a motor M, a cold coke cold water regulating valve N1, a cold coke cold water regulating valve N2, a cold coke steam regulating valve N3, a steam cut-off valve Q, a cold coke cold water cut-off valve R, a discharge heat cut-off valve S, an overflow hot water cut-off valve U, an air release oil steam cut-off valve V, a dephlegmation tower oil gas cut-off valve W, a drain cooling water cut-off valve X, and a balance gas cut-off valve Y. A blowdown system comprises a blowdown tower top air cooler E1, a blowdown tower bottom air cooler E2, a blowdown tower bottom pump G1 and a pump minimum flow regulating valve J1; the make-up fresh water regulator valve J2 is controlled by the plant's existing DCS. The control system mainly comprises steam 102, cold coke cold water 103, emptying oil steam 104, overflow hot water 105, discharge hot water 106, drainage cooling water 107, cold coke cold water 108, balance gas 109 and oil gas 110 of a dephlegmation tower. The main parameters of detection, judgment, setting and control are a thermometer T, a pressure gauge P, a flowmeter F, a material level or liquid level meter L, a valve position, the running state of a motor M, time and the like.
Pressing an automatic coke cooling button of a coke tower, automatically calling operation data of a DCS (distributed control system) by an intelligent controller I, judging whether air coolers E1 and E2 of an emptying system and a bottom pump G1 of the emptying tower operate or not, and if the air coolers E1 and E2 and the bottom pump G1 of the emptying tower operate, confirming that the emptying system operates normally; judging whether the on-off state of the four-way valve points to another tower or not, and if the feeding temperature of the coke tower is less than or equal to 300 ℃, confirming that the coke tower reaches a cold coke condition; and if the two items meet the requirements, the program automatically executes the cold coke operation, and if the cold coke operation does not meet the requirements, the program gives an alarm to prompt and an operator processes the cold coke operation until the condition requirements are met.
The automatic coke cooling process is basically similar to the manual coke cooling process, the valve is automatically opened and closed under the control of a program, whether the valve is opened or closed or not is judged automatically by the program according to related parameters, the condition of each step does not meet the requirement, the next step of operation is not carried out, the prompt is carried out at any time, errors are avoided, and after the coke cooling is finished, the program automatically prompts and operators can switch to the next operation procedure.
The automatic coke cooling program controls the step 1: automatically opening an emptying oil and gas cut-off valve V, simultaneously automatically closing an oil and gas cut-off valve W of the dephlegmation tower, judging the valve position of the emptying oil and gas cut-off valve V to be fully opened by a program, and judging the oil and gas cut-off valve W of the dephlegmation tower to be fully closed by the program; the method meets the conditions, the flow rate of the cold coke steam regulating valve N3 is set to be 5t/h by a program, a steam stop valve Q is automatically opened, the steam passes through a coke tower, oil gas in stripped coke forms emptying oil gas 104, the produced emptying oil gas 104 flows out from the top of the coke tower to an emptying tower B, countercurrent heat exchange is carried out between the inside of the emptying tower and heavy dirty oil 114 reflowing from the upper part, the washed and cooled dirty oil and reflowing heavy dirty oil enter the bottom of the tower together, a part of the heavy dirty oil 114 cooled by an emptying tower bottom air cooler E2 is pumped out by an emptying tower bottom pump G1 to the top of the tower to be used as reflux, and the other part of the heavy dirty oil is sent out of a device; and the gas at the top of the emptying tower is condensed and cooled by an emptying tower top air cooler E1 and enters a three-phase separator C, and the separated gas 111, light dirty oil 112 and oily sewage 113 are respectively sent out of the device. After the flow of the cold coke steam is 5t/h and is maintained for about 0.5 hour, the pressure of a coke tower top outlet pipeline is lower than 0.2MPa (g), the flow of the cold coke steam regulating valve N3 is given by a program to be 8t/h, the flow of the cold coke steam is 8t/h and is maintained for about 0.5 hour, the pressure of the coke tower top outlet pipeline is lower than 0.2MPa (g), the flow of the cold coke steam regulating valve N3 is given by a program to be 12t/h, if the pressure of the coke tower top outlet pipeline reaches 0.28MPa (g), the flow of the cold coke steam regulating valve N3 is automatically given by a program to be 8t/h, if the pressure of the coke tower top outlet pipeline is lower than 0.20MPa (g), the flow of the cold coke steam regulating valve N3 is restored to be 12t/h, the flow of the cold coke steam is 12t/h and is maintained for about 1.0 hour, the pressure of the, the program confirms that the steam coke cooling is finished, and the next operation is automatically carried out. The temperature, pressure and flow of the coke tower top emptying oil gas 104 change along with the flow and time of the introduced cold coke steam, so that the operation parameters of the emptying tower part also change, and the operation adjustment of the emptying tower part is controlled by the original DCS of the device.
The step 2 of automatic coke cooling program control: the program controls the cold coke cold water pump G2 to be automatically started, the cold coke cold water of the cold coke cold water tank D1 is pumped, the minimum flow control valve J1 of the automatic operation pump automatically controls the flow of the pump, the program sets the flow of the cold coke cold water 103 regulating valve N1 to be 10t/h, the cold coke cold water stop valve R is automatically opened, and after the flow of the cold coke cold water is maintained for 0.5 hour, the steam stop valve Q is automatically closed after the cold coke cold water is determined to enter the coke tower. Cold coke cold water 103 enters a coke tower A to cool coke 101, generated emptying oil steam 104 flows out from the top of the coke tower to an emptying tower B, countercurrent heat exchange is carried out in the emptying tower and heavy dirty oil 114 reflowing from the upper part, the washed and cooled dirty oil and reflowing heavy dirty oil enter the bottom of the tower together, a part of the heavy dirty oil 114 cooled by an emptying tower bottom cooler E2 is pumped out by an emptying tower bottom pump G1 to the top of the tower to be used as reflux, and the other part of the heavy dirty oil is sent out of the device as heavy dirty oil; and the gas at the top of the emptying tower is condensed and cooled by an emptying tower top air cooler E1 and enters a three-phase separator C, and the separated gas 111, light dirty oil 112 and oily sewage 113 are respectively sent out of the device. The program sets the flow rate of the cold coke cold water 103 regulating valve N1 to be maintained for 20 minutes, then the flow rate set value of the cold coke cold water is increased by 1t/h every 1 minute, when the pressure of the coke tower top outlet pipeline is lower than 0.2MPa (g), the flow rate set value of the cold coke cold water is increased all the time, when the flow rate reaches 100t/h, the cold coke cold water 103 regulating valve N1 cannot meet the requirement, the cold coke cold water regulating valve N2 is started, and after the cold coke cold water regulating valve N2 is put into service, the flow rate set value of the cold coke cold water is the flow sum of the two regulating valves. And (3) detecting the pressure P of the outlet pipeline at the top of the coke tower A while increasing the flow of the cold coke cold water, and repeating the steps until the pressure P of the outlet pipeline at the top of the coke tower A reaches 0.25MPa (g), wherein the flow set value of the cold coke cold water is reduced by 2t/h every 1 minute until the pressure of the outlet pipeline at the top of the coke tower is lower than 0.2MPa (g), and the flow set value of the cold coke cold water is increased by 1t/h every 1 minute.
And 3, controlling an automatic coke cooling program: detecting the temperature T of the coke tower top outlet pipeline to be lower than 150 ℃ and the pressure P of the coke tower top outlet pipeline to be lower than 0.2MPa (g), detecting the water level in the tower through a level meter L, when the water level in the coke tower reaches the upper limit, programming the flow rate of cold coke cold water of a cold coke cold water adjusting valve to be 100T/h, starting a cold coke water air cooler, programming the flow rate of a drain cooling water adjusting valve to be 100T/h, automatically opening a drain cooling water stop valve X, enabling drain cooling water 107 to enter a cold coke cold water tank D1 through a mixer, after confirming that the valve is opened, automatically opening an overflow hot water stop valve U, automatically closing an air-release oil steam stop valve V, mixing the coke tower top overflow hot water 105 and the drain cooling water 107 through a mixer O, cooling the mixture and then entering the cold coke cold water tank D1, and automatically adjusting the flow rate of the drain cooling.
And (4) controlling an automatic coke cooling program: the automatic overflow hot water trip valve U that opens begins the timing, lasts 2 hours after, detects coke tower top outlet pipeline temperature simultaneously and has reached about 90 ℃, the cold burnt cold water trip valve R of self-closing, then opens balanced gas trip valve Y, and the balanced gas 109 of the waste heat production of coke 101 is discharged to the atmosphere through muffler H, then closes overflow hot water trip valve U.
And 5, controlling an automatic coke cooling program: setting the flow of the discharged cooling water regulating valve to be 200t/H by a program, opening a coke drum discharged hot water cut-off valve S, enabling the discharged hot water 106 to automatically flow from the coke drum A to a mixer O, mixing the discharged cooling water with the mixer O, cooling the mixture to a cold coke cold water tank D1, automatically regulating the flow of the discharged cooling water according to the temperature of cold coke cold water 108, and enabling balance gas 109 to enter the coke drum through a silencer H to balance the pressure in the coke drum when the discharged hot water 106 is discharged from the coke drum A. And detecting the pressure P of a water drain pipeline at the bottom of the coke tower, judging whether water drainage is finished, and automatically closing the hot water discharge stop valve S when the pressure P of the water drain pipeline at the bottom of the coke tower is lower than 0.001MPa (g) or reaches the set time for automatically opening the hot water discharge stop valve S of the coke tower to confirm that water drainage is finished. And starting timing by closing a hot water discharge stop valve S of the coke tower, stopping running the cold coke cold water pump G2 and the cold coke cold water air cooler E after the time lasts for 4 hours or when the temperature T of the cold coke cold water tank is lower than 70 ℃, closing the water discharge and cooling water stop valve X, finishing coke cooling of the coke tower, automatically prompting a program, and displaying that the next operation can be carried out. When the liquid level L of the cold coke cold water tank is lower, the tank is automatically supplemented with fresh water 115 through a fresh water supplementing regulating valve J2.
The above process descriptions and process parameters are only examples, and the control parameters of the automatic coke cooling process method and the control of the coke tower automatic coke cooling process method according to the invention are different for different scale devices.
Claims (8)
1. An automatic coke cooling process method and control of a coke tower, particularly use steam and cold coke cold water as cooling medium to carry on the contact cooling to the coke in the coke tower, use the blow-down tower to carry on the airtight treatment to the blow-down oil gas produced in the cold coke process, adopt and mix the measure of cold coke cold water to reduce the cold coke drainage temperature of cold coke hot water discharged in the cold coke process, reduce the exhaust emission; according to the parameters of temperature, pressure, time, flow and the like of materials entering and exiting from the coke tower in the coke cooling process, relevant valves and equipment are controlled through a logic automatic control system, and the full automation of the coke cooling process of the coke tower is realized.
Is characterized in that:
the steam is 1.0MPa steam of a refinery pipe network, and the cold coke cold water is fresh water which is hermetically recycled in the cold coke process; the method comprises the following steps of performing closed treatment by adopting an emptying tower, namely performing absorption, condensation and cooling on emptying oil vapor in the tower through return oil, cooling heavy oil at the bottom of the tower, sending the cooled emptying oil vapor out of a device, further cooling gas at the top of the tower, separating the gas from a separation tank, sending the gas to a low-pressure gas pipe network, and sending the separated light dirty oil and sewage out of the device; the step of reducing the cold coke drainage temperature is to arrange a cold coke cold water tank, and mix cold coke overflow hot water and hot water discharged from the bottom of the coke tower in front of the cold coke cold water tank to discharge cooling water so as to reduce the operating temperature of the cold coke water tank; the coke in the coke tower is cooled by contact, pores are formed by steam stripping of oil gas in coke gaps, then cold coke cold water exchanges heat with the coke, the cold coke cold water permeates into the coke pores, and the coke is cooled by latent heat of gasification and sensible heat of the cold coke cold water; the oil gas at the top of the coke tower is a mixed gas of steam and oil gas which are generated during the cooling of the coke and flow out from the top of the coke tower; the coke cooling time and the coke cooling medium flow rate refer to the time for introducing steam and the time for introducing cold coke cold water into the coke tower, which are specified according to the operation period of the coke tower, and the steam flow rate and the cold coke cold water flow rate which are controlled according to the coke cooling time, the tower top temperature and the pressure; the logic automatic control system carries out logic judgment according to parameters such as temperature, pressure, liquid level, flow, time and the like and by comparing set values, automatically switches and adjusts related valves in sequence, and starts and stops related equipment; the related valves and devices refer to a stop valve, a regulating valve, an air cooler and a pump related to the coke cooling process.
2. The automatic coke cooling process and control of coke drum as claimed in claim 1, characterized by: the automatic control system comprises a logic automatic control system, wherein the logic automatic control system is composed of logic control software programs, a controller, an operation panel and other hardware, and the control system adopts DCS or PLC.
3. The automatic coke-cooling process method and control of coke tower as claimed in claim 1, wherein said logic control program means that when the steam-feeding condition is satisfied and the steam-feeding time point is reached, the oil-gas emptying cut-off valve, the steam cut-off valve and the coke-cooling steam regulating valve are opened sequentially according to the set value of steam flow.
4. The automatic coke cooling process and control of coke tower as claimed in claim 1, wherein said logic control program is to start the coke cooling water pump, start the minimum flow control valve, open the coke cooling water cut-off valve, and adjust the coke cooling water regulating valve according to the coke cooling water flow set value, when the water passing condition is satisfied and the coke cooling water passing time is reached. And after the cold coke cold water flow reaches a certain set value, closing the cold coke steam regulating valve and the steam stop valve in sequence.
5. The automatic coke-cooling process and control of coke tower as claimed in claim 1, wherein said logic control program is to automatically combine and regulate two cold coke cold water regulating valves to gradually and automatically increase the flow rate of cold coke cold water by 1-5 tons/min based on a certain flow rate set value, detect the pressure at the top of the coke tower, gradually and automatically decrease the flow rate set value of cold coke cold water by 2-10 tons/min when the pressure at the top of the coke tower is higher than the set value, and gradually and automatically increase the flow rate set value of cold coke cold water by 1-5 tons/min when the pressure at the top of the coke tower is lower than the set value.
6. The automatic coke cooling process and control of coke tower as claimed in claim 1, wherein said logic control program is to automatically set the cold coke cold water regulating valve to a smaller flow when the water level in the coke tower reaches a specified level, automatically open the overflow hot water cut-off valve and close the air and steam cut-off valve at the same time, start the air cooler, open the drain cooling water cut-off valve, mix the top overflow hot water and the drain cooling water, and automatically adjust the amount of the drain cooling water according to the mixed cold coke water temperature.
7. The automatic coke-cooling process and control of coke tower as claimed in claim 1, wherein said logic control program is to automatically close the cold coke cold water shut-off valve and cold coke cold water regulating valve when the temperature at the top of the coke tower reaches a specified value, automatically and sequentially open the balance gas shut-off valve and close the overflow hot water shut-off valve, prepare for draining water, open the hot water shut-off valve, mix the hot water discharged from the bottom of the coke tower with the discharged water cooling water, automatically adjust the amount of discharged water cooling water according to the mixed cold coke water temperature, when the discharged water cooling water and the mixed cold coke water temperature are substantially the same, the draining is finished, the hot water shut-off valve, the air cooler, the cold coke water pump are closed, and the.
8. The automatic coke cooling process and control of coke drum as claimed in claim 1, characterized by: comprises a coke cooling water tank, an air cooler, a pump, a valve and the like. The equipment and valves should consider the resistance to erosion and blockage by coke powder. The emptying tower and the accessory facilities are the existing mature process and equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010189262.2A CN111320993B (en) | 2020-03-17 | 2020-03-17 | Automatic coke cooling process method and control for coke tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010189262.2A CN111320993B (en) | 2020-03-17 | 2020-03-17 | Automatic coke cooling process method and control for coke tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111320993A true CN111320993A (en) | 2020-06-23 |
| CN111320993B CN111320993B (en) | 2023-04-11 |
Family
ID=71171524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010189262.2A Active CN111320993B (en) | 2020-03-17 | 2020-03-17 | Automatic coke cooling process method and control for coke tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111320993B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057149A (en) * | 2021-11-16 | 2022-02-18 | 国家石油天然气管网集团有限公司华南分公司 | Conveying method, device and medium for product oil |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3895448A (en) * | 1973-12-19 | 1975-07-22 | Koppers Co Inc | Dry coke cooler |
| JPS5770186A (en) * | 1980-10-21 | 1982-04-30 | Kawasaki Steel Corp | Preparation of coke gas utilizing quenching equipment of coke oven |
| CN2533134Y (en) * | 2002-03-07 | 2003-01-29 | 中国石化镇海炼油化工股份有限公司 | Coke cooling water circulation treatment devic for coking |
| CN101015749A (en) * | 2006-12-30 | 2007-08-15 | 华东理工大学 | Method and device for treating waste gas in coke cooling water |
| CN201145850Y (en) * | 2007-06-17 | 2008-11-05 | 袁志祥 | Automatic operation system for delayed coking coke chamber |
| CN102847398A (en) * | 2011-06-28 | 2013-01-02 | 中国石油化工集团公司 | Apparatus and method for treating waste steam discharged from decoking step of delayed coking process |
| CN203275960U (en) * | 2013-03-11 | 2013-11-06 | 中石化洛阳工程有限公司 | Operation security control system for delay-coking coke tower |
| CN104419444A (en) * | 2013-09-09 | 2015-03-18 | 中国石化工程建设有限公司 | Method for recycling water-containing sump oil by utilizing delayed coking device |
| CN104560105A (en) * | 2013-10-29 | 2015-04-29 | 中国石油天然气股份有限公司 | Delayed coking steam evacuating and cooling system and application thereof |
| CN105005211A (en) * | 2015-08-26 | 2015-10-28 | 武汉大学 | Delayed coking process sequence control simulation system and method thereof |
| CN109575958A (en) * | 2018-12-06 | 2019-04-05 | 武汉科技大学 | A kind of cold coke installation of delayed coking dry method and method |
-
2020
- 2020-03-17 CN CN202010189262.2A patent/CN111320993B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3895448A (en) * | 1973-12-19 | 1975-07-22 | Koppers Co Inc | Dry coke cooler |
| JPS5770186A (en) * | 1980-10-21 | 1982-04-30 | Kawasaki Steel Corp | Preparation of coke gas utilizing quenching equipment of coke oven |
| CN2533134Y (en) * | 2002-03-07 | 2003-01-29 | 中国石化镇海炼油化工股份有限公司 | Coke cooling water circulation treatment devic for coking |
| CN101015749A (en) * | 2006-12-30 | 2007-08-15 | 华东理工大学 | Method and device for treating waste gas in coke cooling water |
| CN201145850Y (en) * | 2007-06-17 | 2008-11-05 | 袁志祥 | Automatic operation system for delayed coking coke chamber |
| CN102847398A (en) * | 2011-06-28 | 2013-01-02 | 中国石油化工集团公司 | Apparatus and method for treating waste steam discharged from decoking step of delayed coking process |
| CN203275960U (en) * | 2013-03-11 | 2013-11-06 | 中石化洛阳工程有限公司 | Operation security control system for delay-coking coke tower |
| CN104419444A (en) * | 2013-09-09 | 2015-03-18 | 中国石化工程建设有限公司 | Method for recycling water-containing sump oil by utilizing delayed coking device |
| CN104560105A (en) * | 2013-10-29 | 2015-04-29 | 中国石油天然气股份有限公司 | Delayed coking steam evacuating and cooling system and application thereof |
| CN105005211A (en) * | 2015-08-26 | 2015-10-28 | 武汉大学 | Delayed coking process sequence control simulation system and method thereof |
| CN109575958A (en) * | 2018-12-06 | 2019-04-05 | 武汉科技大学 | A kind of cold coke installation of delayed coking dry method and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057149A (en) * | 2021-11-16 | 2022-02-18 | 国家石油天然气管网集团有限公司华南分公司 | Conveying method, device and medium for product oil |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111320993B (en) | 2023-04-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101760606B (en) | Control method of protective atmosphere of stainless steel cover type annealing furnace | |
| JPS5829889A (en) | Automatic co2 removing device and operation | |
| CN111320993B (en) | Automatic coke cooling process method and control for coke tower | |
| CN114394778B (en) | Hot stuffy method and hot stuffy equipment for steel slag and steel slag for road engineering | |
| CN203275960U (en) | Operation security control system for delay-coking coke tower | |
| CN113593653B (en) | Wet desulfurization device overall economic benefit optimal control method | |
| CN106914068A (en) | A kind of delayed coking exhaust gas treating method | |
| CN102344825B (en) | Continuous delay coking device and method | |
| CN206973602U (en) | A kind of spent acid pyrolysis furnace furnace gas temperature control system | |
| CN113655824B (en) | Wet desulphurization spraying amount and spraying slurry pH value coupling control optimization method | |
| CN111471822A (en) | Control method of converter vaporization cooling system | |
| RU2388788C2 (en) | Control method of hydraulic mode of coke furnace battery, and device for method's implementation | |
| CN209537411U (en) | A kind of molecular sieve dehydration system for natural gas processing field | |
| CN113659179A (en) | Hydrogen backflow control system and control method for fuel cell test platform | |
| CN109631616B (en) | Low-temperature liquid steam heater and heating method | |
| CN107501039B (en) | Control method for pollution discharge and recovery of vinyl chloride high-boiling tower | |
| CN110044134B (en) | One-key start-stop control method for full-automatic nitrogen making machine system | |
| CN114838236A (en) | Device and method for plugging outlet pipeline of slurry pump of catalytic cracking device by injecting paraffin | |
| CN202082905U (en) | System for controlling pressure of steam drum of waste heat boiler | |
| CN103867883A (en) | Normal-pressure drainage system unit for steam condensate water | |
| CN219624010U (en) | Automatic control device for periodic pollution discharge of boiler | |
| EA029785B1 (en) | Delayed coking drum quench overflow system and method | |
| CN113323853B (en) | Unmanned full-automatic control method for air compressor group of air compression station | |
| CN219898177U (en) | Hexafluoropropylene schizolysis automatic control system | |
| CN209295151U (en) | A kind of torch gas Trunk Line vibration protection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |