CN104315755A - Wet process type tanning multi-section heating system and control method - Google Patents
Wet process type tanning multi-section heating system and control method Download PDFInfo
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- CN104315755A CN104315755A CN201410539144.4A CN201410539144A CN104315755A CN 104315755 A CN104315755 A CN 104315755A CN 201410539144 A CN201410539144 A CN 201410539144A CN 104315755 A CN104315755 A CN 104315755A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention discloses a wet process type tanning multi-section heating system and a control method. The system is characterized in that condensate produced by a heat exchanger enters a flashing tank to flash, and the secondary steam after flashing is ejected and pressurized by one part of fresh steam through a heat pump to be supplied for the heat exchanger at the lower section; when the temperature of the secondary steam does not meet the heating requirement, the steam is supplemented by the fresh steam. The control method comprises the following steps of enabling a temperature transmitter to send the measured outlet temperature of a hot air pipe to a temperature controller, enabling a flow rate transmitter to send the measured flow rate of cold air entering the heat exchanger into a flow rate controller, adjusting the opening degree of a steam value under the combined action of the temperature controller and the flow rate controller on a main controller, then adjusting the flow rate of the steam entering the heat exchanger, and controlling the outlet temperature of the hot air pipe to reach the specified value. The method and the system have the advantages that the requirement of hot air temperature required by drying of base cloth is met, the heat energy of steam condensate is sufficiently recycled, the high-efficiency utilization rate of the steam in cogeneration is realized, and the problem of heating safety of heat conduction oil is solved.
Description
Technical field
The present invention relates to a kind of heating system, be specifically related to a kind of wet method process hides multistage heating system and control method.
Background technology
Synthetic leather is the best substitute of natural leather, current PU synthetic leather wet process technique flow process be by base material once through dip-coating, blade coating, solidify, wash, then use hot-air seasoning to obtain finished product.Wherein, improve apparent property while that the object of dry run being and by drying adjustment base cloth morphosis, base cloth being shaped, remove the moisture in base cloth, promote the combination of finish and fiber.Traditional drying thermal source used is the hot blast that heat-conducting oil heating cold air is formed, and hot blast blows drying by hot air circulating system to wet basis cloth.Use the hot blast temperature of heat-conducting oil heating can meet the dry requirement of base cloth, but energy-saving and cost-reducing with in safety issue, carry out the drying of base cloth with heat-conducting oil heating cold air not satisfactory.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of wet method process hides multistage heating system and control method, this system can by abundant for the heat of steam condensate (SC) reuse while meeting hot blast temperature needed for the drying of base cloth, not only achieve high-efficiency steam ground utilization rate in cogeneration of heat and power, energy-saving and cost-reducing, and compensate for the safety issue of heat-conducting oil heating.
For achieving the above object, the present invention adopts following technical scheme:
A kind of wet method process hides multistage heating system, comprises main steam range, cold air house steward, several flash tanks and several heat exchangers, main steam range is connected to some steam branch pipes, steam branch pipe is arranged successively along entering steam direction, the all corresponding heat exchanger of each steam branch pipe, the steam inlet of the heat exchanger that each steam branch pipe is all corresponding with it is connected, cold air house steward is connected to some cold air arms, cold air arm is arranged successively along entering cold air direction, the all corresponding steam branch pipe of each cold air arm, and the cool air inlet of all corresponding with it heat exchanger corresponding to steam branch pipe of each cold air arm is connected, each heat exchanger bottom is all connected to warm-air pipe and condensate pipe, each warm-air pipe is all connected to drying oven, condensate water pot is connected to along the condensate pipe entering last heat exchanger bottom, steam direction, the all corresponding flash tank of each condensate pipe of heat exchanger bottom above, and the condensing water inlet of all corresponding with it flash tank of each condensate pipe is connected, each flash tank top is all connected with steam reuse pipe, and each steam reuse pipe is communicated with main steam range, each steam reuse pipe is equipped with heat pump, each heat pump is all connected to steam inlet pipe, each steam inlet pipe is all connected with the steam inlet of the heat exchanger being positioned at its rear.
Further, each flash tank bottom is all connected to drainpipe, be communicated with drainpipe between flash tank, also be communicated with by drainpipe between flash tank with condensate water pot, each drainpipe is equipped with check valve and condensation water valve, the two ends of each check valve are all connected to suction hose, and each suction hose is all connected to condensate pump, and the two ends of condensate pump are all connected to valve; Each steam branch pipe is all connected to steam valve, each condensate pipe is all connected to drain valve, the warm-air pipe of each heat exchanger is all connected to temperature transmitter, temperature transmitter is connected with temperature controller, temperature controller is connected to master controller, the cold air arm of each heat exchanger is all connected to flow transmitter, flow transmitter is connected with flow controller, flow controller is connected with master controller, and master controller is connected with the steam valve on steam branch pipe; Each flash tank is all connected to liquid level sensor, liquid level sensor is connected with fluid level controller, fluid level controller is connected with condensation water valve.
Further, described heat exchanger has three, be respectively First Heat Exchanger, second heat exchanger and the 3rd heat exchanger, flash tank has two, be respectively the first flash tank and the second flash tank, main steam range is connected to the first steam branch pipe, second steam branch pipe and the 3rd steam branch pipe, first steam branch pipe is connected with the steam inlet of First Heat Exchanger, second steam branch pipe is connected with the steam inlet of the second heat exchanger, 3rd steam branch pipe is connected with the steam inlet of the 3rd heat exchanger, cold air house steward is connected to three cold air arms, three cold air arms respectively with First Heat Exchanger, second heat exchanger is connected with the cool air inlet of the 3rd heat exchanger, First Heat Exchanger bottom is connected to the first warm-air pipe and the first condensate pipe, first warm-air pipe leads to one section of drying oven, second heat exchanger bottom is connected to the second warm-air pipe and the second condensate pipe, second warm-air pipe leads to two-stage drying baking oven, 3rd heat exchanger bottom is connected to the 3rd warm-air pipe and the 3rd condensate pipe, 3rd warm-air pipe leads to three sections of drying ovens, first condensate pipe is connected with the condensing water inlet of the first flash tank, second condensate pipe is connected with the condensing water inlet of the second flash tank, 3rd condensate pipe is connected with the condensing water inlet of condensate water pot, first flash tank top is connected to the first steam reuse pipe, and the first steam reuse pipe is communicated with main steam range, first steam reuse pipe is provided with the first heat pump, first heat pump is connected to the first steam inlet pipe, first steam inlet pipe is connected with the steam inlet of the second heat exchanger, second flash tank top is connected to the second steam reuse pipe, second steam reuse pipe is connected to the second heat pump, second heat pump is connected to the second steam inlet pipe, second steam inlet pipe is connected with the steam inlet of the 3rd heat exchanger.
Further, first flash tank bottom is connected to first row water pipe, bottom is connected to the first impurity exhaust conduit, first row water pipe is connected with the second flash tank, and first row water pipe is provided with the first check valve and the first condensation water valve, be connected to the first suction hose between the two ends of the first check valve, the first suction hose is provided with the first condensate pump, and the two ends of the first condensate pump are all connected to valve; Second flash tank bottom is connected to second row water pipe, bottom is connected to the second impurity exhaust conduit, second row water pipe is connected with condensate water pot, and second row water pipe is provided with the second check valve and the second condensation water valve, the second suction hose is connected between the two ends of the second check valve, second suction hose is provided with the second condensate pump, and the two ends of the second condensate pump are all connected to valve.
Further, first steam branch pipe, the second steam branch pipe and the 3rd steam branch pipe are respectively equipped with the first steam valve, the second steam valve and the 3rd steam valve, the first condensate pipe, the second condensate pipe and the 3rd condensate pipe are respectively equipped with the first drain valve, the second drain valve and the 3rd drain valve, first warm-air pipe is connected to the first temperature transmitter, the second warm-air pipe is connected to the second temperature transmitter, the 3rd warm-air pipe is connected to the 3rd temperature transmitter, the first temperature transmitter, second temperature transmitter and the 3rd temperature transmitter are connected with the first temperature controller respectively, second temperature controller and the 3rd temperature controller, the first temperature controller, second temperature controller and the 3rd temperature controller are connected to the first master controller respectively, second master controller and the 3rd master controller, the cold air arm of three heat exchangers is connected to first flow transmitter respectively, second transmitter and the 3rd flow transmitter, first flow transmitter, second transmitter and the 3rd flow transmitter are connected with first flow controller respectively, second amount controller and the 3rd flow controller, first flow controller, second amount controller and the 3rd flow controller respectively with the first master controller, second master controller is connected with the 3rd master controller, the first master controller, second master controller and the 3rd master controller respectively with the first steam valve, second steam valve is connected with the 3rd steam valve.
Further, first flash tank and the second flash tank are connected to the first liquid level sensor and the second liquid level sensor respectively, first liquid level sensor and the second liquid level sensor are connected with the first fluid level controller and the second fluid level controller respectively, first fluid level controller and the second fluid level controller are connected with the second condensation water valve with the first condensation water valve respectively, meanwhile, the first fluid level controller is connected with the second condensate pump with the first condensate pump respectively with the second fluid level controller.
Further, be connected to the 3rd impurity exhaust conduit, the first pipeline and second pipe bottom condensate water pot, the first pipeline and second pipe are respectively equipped with the first water pump and the second water pump, the first water pump and the second water delivery side of pump are all managed with washing and are connected; The top of condensate water pot is also connected to steam outlet pipe, and steam outlet pipe is connected to surface condenser, and the delivery port of surface condenser is connected to hot-water outlet pipe, and water inlet is connected to into cold water pipe, and the bottom of surface condenser is connected to downcomer, and downcomer is communicated with condensate water pot.
A control method for wet method process hides multistage heating system, for First Heat Exchanger, setting the first warm-air pipe outlet temperature is T
1, the actual first warm-air pipe outlet temperature that records is T
11if, T
11> T
1or T
11< T
1time, signal transmission is given the first master controller by the first temperature controller, simultaneously, the flowed fluctuation of cold air is passed to the first master controller by first flow controller, first master controller regulates the first steam valve by temperature feedback value and flowed fluctuation value of feedback, makes the first warm-air pipe outlet actual temperature value and T
1equal;
For the second heat exchanger, setting the second warm-air pipe outlet temperature is T
2, the actual second warm-air pipe outlet temperature that records is T
22if, T
22> T
2or T
22< T
2time, signal transmission is given the second master controller by the second temperature controller, simultaneously, the flowed fluctuation of cold air is passed to the second master controller by second amount controller, second master controller regulates the second steam valve by temperature feedback value and flowed fluctuation value of feedback, makes the second warm-air pipe outlet actual temperature value and T
2equal;
For the 3rd heat exchanger, setting the 3rd warm-air pipe outlet temperature is T
3, actual the 3rd warm-air pipe outlet temperature that records is T
33if, T
33> T
3or T
33< T
3time, signal transmission is given the 3rd master controller by the 3rd temperature controller, simultaneously, the flowed fluctuation of cold air is passed to the 3rd master controller by the 3rd flow controller, 3rd master controller regulates the 3rd steam valve by temperature feedback value and flowed fluctuation value of feedback, makes actual temperature value and the T of the 3rd warm-air pipe outlet
3equal; Wherein, T
1> T
2> T
3;
While controlling warm-air pipe outlet temperature, the first flash tank and the second flash tank are also carrying out Liquid level.
Further, described control method is all realized by Feedforward-feedback control system, wherein W
cs () is feedback controller, W
os () is process control channel transfer function, W
fs () is process disturbance channel transfer function, W
ms () is feedforward controller, F (s) can survey uncontrollable disturbance for system, and can survey the effect of uncontrollable disturbance F (s) in system under, the transfer function exported system can survey uncontrollable disturbance F (s) is
Wherein, feed forward models is:
when the flow of cold air changes, feedforward controller W
ms () sends control instruction in time, compensate the impact of cold air flows change on warm-air pipe outlet temperature; And the fluctuation of warm-air pipe outlet temperature is by feedback controller W
cs () overcomes.
Further, the liquid level controlling method of the first flash tank and the second flash tank is: set a level value L respectively to the first flash tank and the second flash tank, deadband upper limit 1.1L, deadband lower limit 0.9L, and the actual liquid level value of the first flash tank is L
1, the actual liquid level value of the second flash tank is L
2;
For the first flash tank, if 0.9L≤L
1≤ 1.1L, under the control of the first fluid level controller, the first flash tank utilizes the first condensation water valve to carry out the outer row of condensed water;
If L
1> 1.1L, the first fluid level controller controls unlatching first condensate pump and works in coordination with the outer row carrying out condensed water;
If L
1< 0.9L, the first condensate pump stops, and is switched to the outer row utilizing the first condensation water valve to carry out condensed water;
For the second flash tank, if 0.9L≤L
2≤ 1.1L, under the control of the second fluid level controller, the second flash tank utilizes the second condensation water valve to carry out the outer row of condensed water;
If L
2> 1.1L, the second fluid level controller controls unlatching second condensate pump and works in coordination with the outer row carrying out condensed water;
If L
2< 0.9L, the second condensate pump stops, and is switched to the outer row utilizing the second condensation water valve to carry out condensed water.
Compared with prior art, the present invention has following useful technique effect:
The condensed water produced in heat exchanger in the present invention enters flash tank and carries out flash distillation, indirect steam after flash distillation is used by hypomere heat exchanger after the supercharging of a part of live steam injection through heat pump, when indirect steam temperature does not reach heating requirements, filling is carried out by live steam, this mode can by abundant for the heat of condensed water reuse while meeting hot blast temperature needed for the drying of base cloth, achieve the trapezoidal utilization of energy, not only achieve energy-saving and cost-reducing, and compensate for the safety issue of heat-conducting oil heating, and drain valve installed by the condensate pipe be connected with heat exchanger, condensate water can be discharged in time, prevent steam leakage, check valve installed by the drainpipe that flash tank connects, prevent the backflow of condensed water,
Simultaneously, by temperature transmitter, the warm-air pipe outlet temperature measured is sent into temperature controller, the cold air flows entering heat exchanger measured is sent into flow controller by flow transmitter, at temperature controller and flow controller under the acting in conjunction of master controller, steam valve aperture is regulated, and then steam regulation enters the flow of heat exchanger, warm-air pipe outlet temperature is controlled at setting, wherein warm-air pipe outlet temperature is controlled parameter, steam inlet is controling parameters, in order to overcome the interference of the flow of major disturbances and cold air, the detection to cold air flows is added in single closed-loop system, feed-forward and feedback system is formed with single closed-loop control, the change of cold air flows is as measurable disturbance, control action will be produced in time when changes in flow rate by feedforward controller, the impact of cold air flows on hot-blast outlet temperature is eliminated by changing quantity of steam, after FEEDBACK CONTROL thermoregulator obtains the information of variations in temperature simultaneously, by by certain control law, control action is produced to quantity of steam,
In the present invention, flash tank liquid level adopts the chain control of condensation water valve and condensate pump, the open cold condensate pump when liquid level reaches deadband upper limit height; Condensate pump is stopped when liquid level reaches deadband lower limit, loop switch is to adopting condensation water valve to Liquid level, avoid and often change condensate pump, avoid control action too frequent simultaneously, eliminate the concussion caused by condensed water control valve and condensate pump frequent movement.
Accompanying drawing explanation
Fig. 1 is wet method process hides multistage heating system schematic of the present invention;
Fig. 2 is wet method process hides multistage heating system control scheme schematic diagram of the present invention;
Fig. 3 is the Feedforward-feedback control system block diagram that the present invention relates to;
Fig. 4 is the flash tank tank level control system block diagram that the present invention relates to.
Wherein, 1, main steam range; 2, the first steam branch pipe; 3, the first steam valve; 4, the first steam reuse pipe; 5, the first heat pump; 6, the first steam inlet pipe; 7, the second steam branch pipe; 8, the second steam valve; 9, the second steam reuse pipe; 10, the second heat pump; 11, the 3rd steam branch pipe; 12, the 3rd steam valve; 13, steam outlet pipe; 14, surface condenser; 15, hot-water outlet pipe; 16, cold air house steward; 17, the first warm-air pipe; 18, First Heat Exchanger; 19, the first drain valve; 20, the first condensate pipe; 21, the first flash tank; 22, the first impurity exhaust conduit; 23, the first suction hose; 24, the first condensate pump; 25, first row water pipe; 26, the second flash tank; 27, the second impurity exhaust conduit; 28, the second suction hose; 29, the second condensate pump; 30, second row water pipe; 31, the 3rd impurity exhaust conduit; 32, condensate water pot; 33, the first pipeline; 34, second pipe; 35, the second water pump; 36, the first water pump; 37, the second warm-air pipe; 38, the second heat exchanger; 39, the second drain valve; 40, the second condensate pipe; 41, the first check valve; 42, the first condensation water valve; 43, the 3rd warm-air pipe; 44, the 3rd heat exchanger; 45, the 3rd drain valve; 46, the 3rd condensate pipe; 47, the second check valve; 48, the second condensation water valve; 49, downcomer; 50, cold water pipe is entered; 51, washing pipe; 52, temperature transmitter; 53, temperature controller; 54, master controller; 55, flow controller; 56, flow transmitter; 57, fluid level controller; 58, liquid level sensor; 59, the second steam inlet pipe.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
A kind of wet method process hides multistage heating system, comprises main steam range 1, cold air house steward 16, several flash tanks and several heat exchangers, main steam range 1 is connected to some steam branch pipes, steam branch pipe is arranged successively along entering steam direction, the all corresponding heat exchanger of each steam branch pipe, the steam inlet of the heat exchanger that each steam branch pipe is all corresponding with it is connected, cold air house steward 16 is connected to some cold air arms, cold air arm is arranged successively along entering cold air direction, the all corresponding steam branch pipe of each cold air arm, and the cool air inlet of all corresponding with it heat exchanger corresponding to steam branch pipe of each cold air arm is connected, each heat exchanger bottom is all connected to warm-air pipe and condensate pipe, each warm-air pipe is all connected to drying oven, condensate water pot 32 is connected to along the condensate pipe entering last heat exchanger bottom, steam direction, the all corresponding flash tank of each condensate pipe of heat exchanger bottom above, and the condensing water inlet of all corresponding with it flash tank of each condensate pipe is connected, each flash tank top is all connected with steam reuse pipe, and each steam reuse pipe is communicated with main steam range 1, each steam reuse pipe is equipped with heat pump, each heat pump is all connected to steam inlet pipe, each steam inlet pipe is all connected with the steam inlet of the heat exchanger being positioned at its rear.Each flash tank bottom is all connected to drainpipe, be communicated with drainpipe between flash tank, also be communicated with by drainpipe between flash tank with condensate water pot 32, each drainpipe is equipped with check valve and condensation water valve, the two ends of each check valve are all connected to suction hose, each suction hose is all connected to condensate pump, and the two ends of condensate pump are all connected to valve; The warm-air pipe of each heat exchanger is all connected to temperature transmitter 52, temperature transmitter 52 is connected with temperature controller 53, temperature controller 53 is connected to master controller 54, the cold air arm of each heat exchanger is all connected to flow transmitter 56, flow transmitter 56 is connected with flow controller 55, flow controller 55 is connected with master controller 54, and master controller 54 is connected with the steam valve on steam branch pipe; Each flash tank is all connected to liquid level sensor 58, liquid level sensor 58 is connected with fluid level controller 57, fluid level controller 57 is connected with condensation water valve.
See Fig. 1, a kind of wet method process hides multistage heating system, comprises main steam range 1, cold air house steward 16, first flash tank 21, second flash tank 26, First Heat Exchanger 18, second heat exchanger 38 and the 3rd heat exchanger 44, main steam range 1 is connected to the first steam branch pipe 2, second steam branch pipe 7 and the 3rd steam branch pipe 11, first steam branch pipe 2, second steam branch pipe 7 and the 3rd steam branch pipe 11 are respectively equipped with the first steam valve 3, second steam valve 8 and the 3rd steam valve 12, first steam branch pipe 2 is connected with the steam inlet of First Heat Exchanger 18, second steam branch pipe 7 is connected with the steam inlet of the second heat exchanger 38, 3rd steam branch pipe 11 is connected with the steam inlet of the 3rd heat exchanger 44, cold air house steward 16 is connected to three cold air arms, three cold air arms respectively with First Heat Exchanger 18, second heat exchanger 38 is connected with the cool air inlet of the 3rd heat exchanger 44, First Heat Exchanger 18 bottom is connected to the first warm-air pipe 17 and the first condensate pipe 20, first warm-air pipe 17 leads to one section of drying oven, i.e. high temperature section drying oven, second heat exchanger 38 bottom is connected to the second warm-air pipe 37 and the second condensate pipe 40, second warm-air pipe 37 leads to two-stage drying baking oven, i.e. middle-temperature section drying oven, 3rd heat exchanger 44 bottom is connected to the 3rd warm-air pipe 43 and the 3rd condensate pipe 46, 3rd warm-air pipe 43 leads to three sections of drying ovens, i.e. low-temperature zone drying oven, first condensate pipe 20, second condensate pipe 40 and the 3rd condensate pipe 46 are respectively equipped with the first drain valve 19, second drain valve 39 and the 3rd drain valve 45, first condensate pipe 20 is connected with the condensing water inlet of the first flash tank 21, second condensate pipe 40 is connected with the condensing water inlet of the second flash tank 26, 3rd condensate pipe 46 is connected with the condensing water inlet of condensate water pot 32, first flash tank 21 top is connected to the first steam reuse pipe 4, and the first steam reuse pipe 4 is communicated with main steam range 1, first steam reuse pipe 4 is provided with the first heat pump 5, first heat pump 5 is connected to the first steam inlet pipe 6, first steam inlet pipe 6 is connected with the steam inlet of the second heat exchanger 38, second flash tank 26 top is connected to the second steam reuse pipe 9, second steam reuse pipe 9 is connected to the second heat pump 10, second heat pump 10 is connected to the second steam inlet pipe 59, second steam inlet pipe 59 is connected with the steam inlet of the 3rd heat exchanger 44, the 3rd impurity exhaust conduit 31, first pipeline 33 and second pipe 34 is connected to bottom condensate water pot 32, first pipeline 33 and second pipe 34 are respectively equipped with the first water pump 36 and the second water pump 35, first water pump 36 is all connected with washing pipe 51 with the outlet of the second water pump 35, the top of condensate water pot 32 is also connected to steam outlet pipe 13, steam outlet pipe 13 is connected to surface condenser 14, the delivery port of surface condenser 14 is connected to hot-water outlet pipe 15, and water inlet is connected to into cold water pipe 50, the bottom of surface condenser 14 is connected to downcomer 49, and downcomer 49 is communicated with condensate water pot 32.
First flash tank 21 bottom is connected to first row water pipe 25, bottom is connected to the first impurity exhaust conduit 22, first row water pipe 25 is connected with the second flash tank 26, and first row water pipe 25 is provided with the first check valve 41 and the first condensation water valve 42, the first suction hose 23 is connected between the two ends of the first check valve 41, the two ends that first suction hose 23 is provided with the first condensate pump 24, first condensate pump 24 are all connected to valve; Second flash tank 26 bottom is connected to second row water pipe 30, bottom is connected to the second impurity exhaust conduit 27, second row water pipe 30 is connected with condensate water pot 32, and second row water pipe 30 is provided with the second check valve 47 and the second condensation water valve 48, the second suction hose 28 is connected between the two ends of the second check valve 47, the two ends that second suction hose 28 is provided with the second condensate pump 29, second condensate pump 29 are all connected to valve.
See Fig. 2, first warm-air pipe 17, second warm-air pipe 37 and the 3rd warm-air pipe 43 are all connected to temperature transmitter 52, temperature transmitter 52 is connected with temperature controller 53, temperature controller 53 is connected to master controller 54, the cold air arm of each heat exchanger is all connected to flow transmitter 56, flow transmitter 56 is connected with flow controller 55, flow controller 55 is connected with master controller 54, and master controller 54 is connected with the steam valve on steam branch pipe; First flash tank 21 and the second flash tank 26 are all connected to liquid level sensor 58, liquid level sensor 58 is connected with fluid level controller 57, fluid level controller 57 is connected with the second condensation water valve 48 with the first condensation water valve 42 respectively, meanwhile, fluid level controller 57 is connected with the second condensate pump 29 with the first condensate pump 24 respectively.
See Fig. 3, a kind of control method of wet method process hides multistage heating system, for First Heat Exchanger 18, setting the first warm-air pipe 17 outlet temperature is T
1it is, actual that to record the first warm-air pipe 17 outlet temperature be T
11if, T
11> T
1or T
11< T
1time, temperature controller 53 is by signal transmission to master controller 54, and meanwhile, the flowed fluctuation of cold air is passed to master controller 54 by flow controller 55, master controller 54 regulates the first steam valve 3 by temperature feedback value and flowed fluctuation value of feedback, makes the first warm-air pipe 17 export actual temperature value and T
1equal;
For the second heat exchanger 38, setting the second warm-air pipe 37 outlet temperature is T
2it is, actual that to record the second warm-air pipe 37 outlet temperature be T
22if, T
22> T
2or T
22< T
2time, temperature controller 53 is by signal transmission to master controller 54, and meanwhile, the flowed fluctuation of cold air is passed to master controller 54 by flow controller 55, master controller 54 regulates the second steam valve 8 by temperature feedback value and flowed fluctuation value of feedback, makes the second warm-air pipe 37 export actual temperature value and T
2equal;
For the 3rd heat exchanger 44, setting the 3rd warm-air pipe 43 outlet temperature is T
3it is, actual that to record the 3rd warm-air pipe 43 outlet temperature be T
33if, T
33> T
3or T
33< T
3time, temperature controller 53 by signal transmission to master controller 54, simultaneously, the flowed fluctuation of cold air is passed to master controller 54 by flow controller 55, master controller 54 regulates the 3rd steam valve 12 by temperature feedback value and flowed fluctuation value of feedback, the actual temperature value that the 3rd warm-air pipe 43 is exported and T
3equal; Wherein, T
1> T
2> T
3;
More than control all to be realized by Feedforward-feedback control system, wherein W
cs () is feedback controller, W
os () is process control channel transfer function, W
fs () is process disturbance channel transfer function, W
ms () is feedforward controller, F (s) can survey uncontrollable disturbance for system, the effect of uncontrollable disturbance F (s) can be surveyed in system under,
Output to the transfer function that system can survey uncontrollable disturbance F (s) is
Realize full remuneration (i.e. Y (s)/F (s)=0), feed forward models is:
when the flow of cold air changes, feedforward controller W
ms () sends control instruction in time, compensate the impact of cold air flows change on warm-air pipe outlet temperature; And the fluctuation of warm-air pipe outlet temperature is by feedback controller W
cs () overcomes, while controlling warm-air pipe outlet temperature, the first flash tank 21 and the second flash tank 26 are also carrying out Liquid level.
See Fig. 4, the liquid level controlling method of the first flash tank 21 and the second flash tank 26 is: set a level value L respectively, deadband upper limit 1.1L, deadband lower limit 0.9L to the first flash tank 21 and the second flash tank 26, the actual liquid level value of the first flash tank 21 is L
1, the actual liquid level value of the second flash tank 26 is L
2;
For the first flash tank 21, if 0.9L≤L
1≤ 1.1L, under the control of fluid level controller 57, the first flash tank 21 utilizes the first condensation water valve 42 to carry out the outer row of condensed water;
If L
1> 1.1L, fluid level controller 57 controls the collaborative outer row carrying out condensed water of unlatching first condensate pump 24;
If L
1< 0.9L, the first condensate pump 24 stops, and is switched to the outer row utilizing the first condensation water valve 42 to carry out condensed water;
For the second flash tank 26, if 0.9L≤L
2≤ 1.1L, under the control of fluid level controller 57, the second flash tank 26 utilizes the second condensation water valve 48 to carry out the outer row of condensed water;
If L
2> 1.1L, fluid level controller 57 controls the collaborative outer row carrying out condensed water of unlatching second condensate pump 29;
If L
2< 0.9L, the second condensate pump 29 stops, and is switched to the outer row utilizing the second condensation water valve 48 to carry out condensed water.
Below operation principle of the present invention and process are described further:
Live steam in main steam range 1 passes into First Heat Exchanger 18 by the first steam branch pipe 2 and cold air is wherein heated into hot blast, hot blast is passed into high temperature section baking oven through the first warm-air pipe 17 and carries out drying to base cloth, enter the first flash tank 21 from the condensed water of First Heat Exchanger 18 condensation and carry out flash distillation, indirect steam after flash distillation is used by the second heat exchanger 38 after the supercharging of a part of live steam injection through the first heat pump 5, when indirect steam temperature does not reach heating requirements, filling is carried out by live steam, hot blast is passed into middle-temperature section baking oven and carries out drying to base cloth, condensed water remaining in first flash tank 21 flows into the second flash tank 26, enter the second flash tank 26 from the condensed water of the second heat exchanger 38 condensation and carry out flash distillation, indirect steam after flash distillation through the second heat pump 10 by after the supercharging of a part of live steam injection for the 3rd heat exchanger 44, when indirect steam temperature does not reach heating requirements, filling is carried out by live steam, hot blast is passed into low-temperature zone baking oven through the second warm-air pipe 37 and carries out drying to base cloth, and condensed water remaining in the second flash tank 26 flows into condensate draining, the condensed water of the 3rd heat exchanger 44 condensation enters condensate draining 32, and deliver to washing workshop section by the first water pump 36 and the second water pump 35 and carry out reuse, the excess steam in condensate draining 32 enters surface condenser 14 and carries out heat exchange, to reach comprehensive utilization.This mode can by abundant for the heat of condensed water reuse while meeting hot blast temperature needed for the drying of base cloth, achieve the trapezoidal utilization of energy, not only achieve energy-saving and cost-reducing, and compensate for the safety issue of heat-conducting oil heating, and drain valve installed by the condensate pipe be connected with heat exchanger, condensate water can be discharged in time, prevent steam leakage, check valve installed by the drainpipe that flash tank connects, prevents the backflow of condensed water.
Simultaneously, by temperature transmitter 52, the warm-air pipe outlet temperature measured is sent into temperature controller 53, the cold air flows entering heat exchanger measured is sent into flow controller 55 by flow transmitter 56, under temperature controller 53 and the acting in conjunction of flow controller 55 pairs of master controllers 54, steam valve aperture is regulated, and then steam regulation enters the flow of heat exchanger, warm-air pipe outlet temperature is controlled at setting, wherein warm-air pipe outlet temperature is controlled parameter, steam inlet is controling parameters, in order to overcome the interference of the flow of major disturbances and cold air, the detection to cold air flows is added in single closed-loop system, feed-forward and feedback system is formed with single closed-loop control, the change of cold air flows is as measurable disturbance, control action will be produced in time when changes in flow rate by feedforward controller, the impact of cold air flows on hot-blast outlet temperature is eliminated by changing quantity of steam, after FEEDBACK CONTROL thermoregulator obtains the information of variations in temperature simultaneously, by by certain control law, control action is produced to quantity of steam.
In the present invention, flash tank liquid level adopts the chain control of condensation water valve and condensate pump, no matter concerning the first flash tank 21 or the second flash tank 26, and the open cold condensate pump when liquid level reaches deadband upper limit height; Condensate pump is stopped when liquid level reaches deadband lower limit, loop switch is to adopting condensation water valve to Liquid level, avoid and often change condensate pump, avoid control action too frequent simultaneously, eliminate the concussion caused by condensed water control valve and condensate pump frequent movement.
Claims (10)
1. a wet method process hides multistage heating system, is characterized in that, comprises main steam range (1), cold air house steward (16), several flash tanks and several heat exchangers, (1) is connected to some steam branch pipes in main steam range, steam branch pipe is arranged successively along entering steam direction, the all corresponding heat exchanger of each steam branch pipe, the steam inlet of the heat exchanger that each steam branch pipe is all corresponding with it is connected, cold air house steward (16) is connected to some cold air arms, cold air arm is arranged successively along entering cold air direction, the all corresponding steam branch pipe of each cold air arm, and the cool air inlet of all corresponding with it heat exchanger corresponding to steam branch pipe of each cold air arm is connected, each heat exchanger bottom is all connected to warm-air pipe and condensate pipe, each warm-air pipe is all connected to drying oven, condensate water pot (32) is connected to along the condensate pipe entering last heat exchanger bottom, steam direction, the all corresponding flash tank of each condensate pipe of heat exchanger bottom above, and the condensing water inlet of all corresponding with it flash tank of each condensate pipe is connected, each flash tank top is all connected with steam reuse pipe, and each steam reuse pipe is communicated with main steam range (1), each steam reuse pipe is equipped with heat pump, each heat pump is all connected to steam inlet pipe, each steam inlet pipe is all connected with the steam inlet of the heat exchanger being positioned at its rear.
2. a kind of wet method process hides multistage heating system according to claim 1, it is characterized in that, each flash tank bottom is all connected to drainpipe, be communicated with drainpipe between flash tank, also be communicated with by drainpipe between flash tank with condensate water pot (32), each drainpipe is equipped with check valve and condensation water valve, the two ends of each check valve are all connected to suction hose, each suction hose is all connected to condensate pump, and the two ends of condensate pump are all connected to valve, each steam branch pipe is all connected to steam valve, each condensate pipe is all connected to drain valve, the warm-air pipe of each heat exchanger is all connected to temperature transmitter (52), temperature transmitter (52) is connected with temperature controller (53), temperature controller (53) is connected to master controller (54), the cold air arm of each heat exchanger is all connected to flow transmitter (56), flow transmitter (56) is connected with flow controller (55), flow controller (55) is connected with master controller (54), master controller (54) is connected with the steam valve on steam branch pipe, each flash tank is all connected to liquid level sensor (58), liquid level sensor (58) is connected with fluid level controller (57), fluid level controller (57) is connected with condensation water valve.
3. a kind of wet method process hides multistage heating system according to claim 1, it is characterized in that, described heat exchanger has three, be respectively First Heat Exchanger (18), second heat exchanger (38) and the 3rd heat exchanger (44), flash tank has two, be respectively the first flash tank (21) and the second flash tank (26), main steam range (1) is connected to the first steam branch pipe (2), second steam branch pipe (7) and the 3rd steam branch pipe (11), first steam branch pipe (2) is connected with the steam inlet of First Heat Exchanger (18), second steam branch pipe (7) is connected with the steam inlet of the second heat exchanger (38), 3rd steam branch pipe (11) is connected with the steam inlet of the 3rd heat exchanger (44), cold air house steward (16) is connected to three cold air arms, three cold air arms respectively with First Heat Exchanger (18), second heat exchanger (38) is connected with the cool air inlet of the 3rd heat exchanger (44), First Heat Exchanger (18) bottom is connected to the first warm-air pipe (17) and the first condensate pipe (20), first warm-air pipe (17) leads to one section of drying oven, second heat exchanger (38) bottom is connected to the second warm-air pipe (37) and the second condensate pipe (40), second warm-air pipe (37) leads to two-stage drying baking oven, 3rd heat exchanger (44) bottom is connected to the 3rd warm-air pipe (43) and the 3rd condensate pipe (46), 3rd warm-air pipe (43) leads to three sections of drying ovens, first condensate pipe (20) is connected with the condensing water inlet of the first flash tank (21), second condensate pipe (40) is connected with the condensing water inlet of the second flash tank (26), 3rd condensate pipe (46) is connected with the condensing water inlet of condensate water pot (32), first flash tank (21) top is connected to the first steam reuse pipe (4), and the first steam reuse pipe (4) is communicated with main steam range (1), first steam reuse pipe (4) is provided with the first heat pump (5), first heat pump (5) is connected to the first steam inlet pipe (6), first steam inlet pipe (6) is connected with the steam inlet of the second heat exchanger (38), second flash tank (26) top is connected to the second steam reuse pipe (9), second steam reuse pipe (9) is connected to the second heat pump (10), second heat pump (10) is connected to the second steam inlet pipe (59), second steam inlet pipe (59) is connected with the steam inlet of the 3rd heat exchanger (44).
4. a kind of wet method process hides multistage heating system according to claim 3, it is characterized in that, first flash tank (21) bottom is connected to first row water pipe (25), bottom is connected to the first impurity exhaust conduit (22), first row water pipe (25) is connected with the second flash tank (26), and first row water pipe (25) is provided with the first check valve (41) and the first condensation water valve (42), the first suction hose (23) is connected between the two ends of the first check valve (41), first suction hose (23) is provided with the first condensate pump (24), the two ends of the first condensate pump (24) are all connected to valve, second flash tank (26) bottom is connected to second row water pipe (30), bottom is connected to the second impurity exhaust conduit (27), second row water pipe (30) is connected with condensate water pot (32), and second row water pipe (30) is provided with the second check valve (47) and the second condensation water valve (48), the second suction hose (28) is connected between the two ends of the second check valve (47), second suction hose (28) is provided with the second condensate pump (29), and the two ends of the second condensate pump (29) are all connected to valve.
5. a kind of wet method process hides multistage heating system according to claim 4, it is characterized in that, first steam branch pipe (2), the second steam branch pipe (7) and the 3rd steam branch pipe (11) are respectively equipped with the first steam valve (3), the second steam valve (8) and the 3rd steam valve (12), the first condensate pipe (20), the second condensate pipe (40) and the 3rd condensate pipe (46) are respectively equipped with the first drain valve (19), the second drain valve (39) and the 3rd drain valve (45), (17) are connected to the first temperature transmitter with first warm-air pipe, (37) are connected to the second temperature transmitter with second warm-air pipe, 3rd warm-air pipe (43) is connected to the 3rd temperature transmitter, first temperature transmitter, second temperature transmitter and the 3rd temperature transmitter are connected with the first temperature controller respectively, second temperature controller and the 3rd temperature controller, first temperature controller, second temperature controller and the 3rd temperature controller are connected to the first master controller respectively, second master controller and the 3rd master controller, the cold air arm of three heat exchangers is connected to first flow transmitter respectively, second transmitter and the 3rd flow transmitter, first flow transmitter, second transmitter and the 3rd flow transmitter are connected with first flow controller respectively, second amount controller and the 3rd flow controller, first flow controller, second amount controller and the 3rd flow controller respectively with the first master controller, second master controller is connected with the 3rd master controller, first master controller, second master controller and the 3rd master controller respectively with the first steam valve (3), second steam valve (8) is connected with the 3rd steam valve (12).
6. a kind of wet method process hides multistage heating system according to claim 5, it is characterized in that, first flash tank (21) and the second flash tank (26) are connected to the first liquid level sensor and the second liquid level sensor respectively, first liquid level sensor and the second liquid level sensor are connected with the first fluid level controller and the second fluid level controller respectively, first fluid level controller and the second fluid level controller are connected with the second condensation water valve (48) with the first condensation water valve (42) respectively, simultaneously, first fluid level controller and the second fluid level controller are connected with the second condensate pump (29) with the first condensate pump (24) respectively.
7. a kind of wet method process hides multistage heating system according to claim 3, it is characterized in that, condensate water pot (32) bottom is connected to the 3rd impurity exhaust conduit (31), the first pipeline (33) and second pipe (34), first pipeline (33) and second pipe (34) are respectively equipped with the first water pump (36) and the second water pump (35), and the first water pump (36) is all managed (51) with washing with the outlet of the second water pump (35) and is connected; The top of condensate water pot (32) is also connected to steam outlet pipe (13), steam outlet pipe (13) is connected to surface condenser (14), the delivery port of surface condenser (14) is connected to hot-water outlet pipe (15), water inlet is connected to into cold water pipe (50), the bottom of surface condenser (14) is connected to downcomer (49), and downcomer (49) is communicated with condensate water pot (32).
8. the control method of a kind of wet method process hides multistage heating system according to claim 6, is characterized in that, for First Heat Exchanger (18), setting the first warm-air pipe (17) outlet temperature is T
1, actual the first warm-air pipe (17) outlet temperature that records is T
11if, T
11> T
1or T
11< T
1time, signal transmission is given the first master controller by the first temperature controller, simultaneously, the flowed fluctuation of cold air is passed to the first master controller by first flow controller, first master controller regulates the first steam valve (3) by temperature feedback value and flowed fluctuation value of feedback, makes the first warm-air pipe (17) export actual temperature value and T
1equal;
For the second heat exchanger (38), setting the second warm-air pipe (37) outlet temperature is T
2, actual the second warm-air pipe (37) outlet temperature that records is T
22if, T
22> T
2or T
22< T
2time, signal transmission is given the second master controller by the second temperature controller, simultaneously, the flowed fluctuation of cold air is passed to the second master controller by second amount controller, second master controller regulates the second steam valve (8) by temperature feedback value and flowed fluctuation value of feedback, makes the second warm-air pipe (37) export actual temperature value and T
2equal;
For the 3rd heat exchanger (44), setting the 3rd warm-air pipe (43) outlet temperature is T
3it is, actual that to record the 3rd warm-air pipe (43) outlet temperature be T
33if, T
33> T
3or T
33< T
3time, signal transmission is given the 3rd master controller by the 3rd temperature controller, simultaneously, the flowed fluctuation of cold air is passed to the 3rd master controller by the 3rd flow controller, 3rd master controller regulates the 3rd steam valve (12), the actual temperature value that the 3rd warm-air pipe (43) is exported and T by temperature feedback value and flowed fluctuation value of feedback
3equal; Wherein, T
1> T
2> T
3;
While controlling warm-air pipe outlet temperature, the first flash tank (21) and the second flash tank (26) are also carrying out Liquid level.
9. the control method of a kind of wet method process hides multistage heating system according to claim 8, it is characterized in that, described control method is all realized by Feedforward-feedback control system, wherein W
cs () is feedback controller, W
os () is process control channel transfer function, W
fs () is process disturbance channel transfer function, W
ms () is feedforward controller, F (s) can survey uncontrollable disturbance for system, and can survey the effect of uncontrollable disturbance F (s) in system under, the transfer function exported system can survey uncontrollable disturbance F (s) is
Wherein, feed forward models is:
when the flow of cold air changes, feedforward controller W
ms () sends control instruction in time, compensate the impact of cold air flows change on warm-air pipe outlet temperature; And the fluctuation of warm-air pipe outlet temperature is by feedback controller W
cs () overcomes.
10. the control method of a kind of wet method process hides multistage heating system according to claim 8, it is characterized in that, the liquid level controlling method of the first flash tank (21) and the second flash tank (26) is: set a level value L respectively to the first flash tank (21) and the second flash tank (26), deadband upper limit 1.1L, deadband lower limit 0.9L, the actual liquid level value of the first flash tank (21) is L
1, the actual liquid level value of the second flash tank (26) is L
2;
For the first flash tank (21), if 0.9L≤L
1≤ 1.1L, under the control of the first fluid level controller, the first flash tank (21) utilizes the first condensation water valve (42) to carry out the outer row of condensed water;
If L
1> 1.1L, the first fluid level controller controls the collaborative outer row carrying out condensed water of unlatching first condensate pump (24);
If L
1< 0.9L, the first condensate pump (24) stops, and is switched to the outer row utilizing the first condensation water valve (42) to carry out condensed water;
For the second flash tank (26), if 0.9L≤L
2≤ 1.1L, under the control of the second fluid level controller, the second flash tank (26) utilizes the second condensation water valve (48) to carry out the outer row of condensed water;
If L
2> 1.1L, the second fluid level controller controls the collaborative outer row carrying out condensed water of unlatching second condensate pump (29);
If L
2< 0.9L, the second condensate pump (29) stops, and is switched to the outer row utilizing the second condensation water valve (48) to carry out condensed water.
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| CN109751889A (en) * | 2019-03-05 | 2019-05-14 | 苏州软石智能装备有限公司 | Drying chamber heat exchange steam condensate recovering device |
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