CN111195989B - Energy-saving control system - Google Patents
Energy-saving control system Download PDFInfo
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- CN111195989B CN111195989B CN201811377432.9A CN201811377432A CN111195989B CN 111195989 B CN111195989 B CN 111195989B CN 201811377432 A CN201811377432 A CN 201811377432A CN 111195989 B CN111195989 B CN 111195989B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/12—Supplying or proportioning liquid ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
- F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
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- 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
- F26B25/005—Treatment of dryer exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses an energy-saving control system, which is suitable for a production line for producing gypsum boards by using gypsum slurry, and comprises the following components: the drying energy-saving system comprises a dryer and a pulp tank, wherein the dryer comprises an exhaust device, and a spraying device is arranged in the exhaust device and is used for condensing high-temperature water vapor in waste gas to form waste gas hot water; wherein the waste gas is water vapor generated by drying the gypsum board by a dryer; the pulp tank is used for storing waste gas hot water, and the waste gas hot water stored in the pulp tank is used as a hot water source of the gypsum slurry. The energy-saving control system disclosed by the invention can realize the recycling of water resources.
Description
Technical Field
The invention relates to the field of automatic control, in particular to an energy-saving control system.
Background
The temperature of the gypsum slurry in the gypsum board production line is closely related to the energy consumption. Typically, the optimum gypsum slurry temperature is 35 ℃ to 38 ℃, which, if lower, results in lower gypsum board temperatures. Because the temperature of the gypsum board is low, a large amount of waste gas can be generated and discharged when the gypsum board is dried in the dryer, however, the discharge of a large amount of water vapor in the waste gas of the existing dryer is not beneficial to saving water resources.
Disclosure of Invention
In order to solve the technical problem, the invention provides an energy-saving control system which can realize the recycling of water resources.
In order to achieve the object of the present invention, the present invention provides an energy saving control system comprising: drying economizer system, drying economizer system includes desiccator and pulp filling, wherein:
the dryer comprises an exhaust device, wherein a spraying device is arranged in the exhaust device and is used for condensing high-temperature water vapor in the waste gas to form waste gas hot water;
wherein the exhaust gas is water vapor generated by the dryer drying the gypsum board;
the pulp tank is used for storing the waste gas hot water, and the waste gas hot water stored in the pulp tank is used as a hot water source of the gypsum slurry.
According to the energy-saving control system provided by the embodiment of the invention, high-temperature steam in the waste gas in the dryer is condensed by the spraying device to form waste gas hot water, the waste gas hot water is stored by the pulp tank and is used as a hot water source of gypsum slurry, so that the water resource is recycled.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a drying energy-saving system according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a drying energy-saving system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a temperature control system according to an embodiment of the present invention.
Description of reference numerals:
1-pulp filling; 2-an exhaust device; 3-a spraying device;
4-a cold water pipe; 5-hot water pipe; 6, a fan;
7-preheat exchanger; 8-air pipe; 9-a water storage tank;
10-hot water pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Currently, the optimum gypsum slurry temperature is 35 ℃ to 38 ℃, which if lower, would result in a lower gypsum board temperature. The lower temperature of the gypsum board has the following defects: firstly, a large amount of waste gas is generated and discharged when the gypsum board is dried in a dryer, and a large amount of water vapor in the waste gas of the dryer is discharged outside, so that water resources are saved; secondly, the same amount of water evaporated in the dryer requires higher heat, so that the energy consumption is higher, and the energy is not beneficial to saving; more importantly, the production weather is cold in winter, the air temperature is lower, and the energy consumption is higher, so that the production line speed is lower in winter; thirdly, when the gypsum board enters a dryer, a layer of liquefied water is quickly condensed on the surface of the gypsum board due to large temperature difference, watermarks and pits are generated on the paper surface of the gypsum board, the appearance quality of the product is seriously influenced, and the strength of the gypsum board is partially influenced. In addition, the temperature of the gypsum slurry is too high, so that the hydrated crystallization of the calcined gypsum is not favorable, the strength is influenced, and the facing paper is easy to ripple, so that the gypsum board is broken.
In order to overcome the problems, the application provides an energy-saving control system which can be suitable for a production line for producing gypsum boards by using gypsum slurry, and the energy-saving control system can comprise two parts: the drying energy-saving system stores waste gas hot water discharged by the dryer in the pulp tank to serve as a hot water source for generating gypsum slurry so as to realize waste heat recycling of the dryer; and the cold air blown by the fan is preheated by the preheating exchanger and then is conveyed into the dryer, so that the heating temperature of the dried gypsum board in the dryer is increased, and the energy consumption is reduced; and the temperature control system quantitatively conveys the waste gas hot water to a paper pulp tank to be mixed with cold water by monitoring the temperature of the gypsum slurry and controlling the flow of the waste gas hot water recycled from the dryer, outputs the mixture to a batching system (a mixer) to generate the gypsum slurry, and then controls the temperature of the gypsum slurry in real time to realize constant temperature of the gypsum slurry. The energy-saving control system is a plate energy-saving drying system with constant gypsum slurry temperature, and can realize energy conservation during gypsum board drying and the constancy of the gypsum slurry temperature.
In order to realize energy conservation during gypsum board drying, the energy-saving control system provided by the embodiment of the invention can comprise a drying energy-saving system for realizing waste heat recycling of the dryer. Fig. 1 is a schematic structural diagram of an energy-saving drying system according to a first embodiment of the present invention, and as shown in fig. 1, the energy-saving drying system according to the first embodiment of the present invention includes: a dryer and a pulp tank 1.
The dryer comprises an exhaust device 2, wherein a spraying device 3 is arranged in the exhaust device 2 and is used for condensing high-temperature water vapor in the waste gas to form waste gas hot water; wherein the waste gas is water vapor generated by drying the gypsum board by a dryer.
Alternatively, the exhaust device 2 may be a chimney, and the spray device 3 may be disposed on the top of the chimney.
Specifically, in the process that waste gas generated by drying gypsum boards in the dryer is discharged into the atmosphere, the spraying device 3 is additionally arranged in the exhaust device 2 of the dryer, and the spraying device 3 can condense and collect high-temperature water vapor in the waste gas. Meanwhile, cold water sprayed by the spraying device 3 can flow out from the bottom of the exhaust device 2 after being heated by high-temperature water vapor.
The pulp tank 1 is used for storing waste gas hot water, and the waste gas hot water stored in the pulp tank 1 is used as a hot water source of gypsum slurry.
Specifically, the pulp tank 1 is used for receiving and storing the waste gas hot water flowing out from the bottom of the exhaust device 2 of the dryer, mixing the waste gas hot water with cold water, and outputting the mixture to a batching system (such as a mixer) to generate gypsum slurry, so that the waste gas hot water stored in the pulp tank 1 is used as a hot water source of the gypsum slurry.
Wherein, the concrete structure and the realization principle of spray set are the same with prior art to and the structure and the realization principle of desiccator, exhaust apparatus and pulp tank also all are the same with prior art, and this embodiment is not repeated herein.
According to the energy-saving control system provided by the embodiment of the invention, high-temperature steam in the waste gas in the dryer is condensed by the spraying device to form waste gas hot water, the waste gas hot water is stored by the pulp tank and is used as a hot water source of gypsum slurry, so that the water resource is recycled.
Further, in the above embodiment, as shown in fig. 1, the drying energy saving system may further include: a cold water pipe 4. A cold water inlet (not shown) is provided in the exhaust device 2 where the shower device 3 is installed, and a cold water pipe 4 is used to supply cold water to the shower device 3 through the cold water inlet. Specifically, cold water may be supplied to the shower device 3 through the cold water pipe 4.
Further, in the above embodiment, as shown in fig. 1, the drying energy saving system may further include: a hot water pipe 5. The air discharge means 2 is provided with a hot water outlet (not shown), and the pulp tank 1 is provided with a hot water inlet (not shown); the hot water pipe 5 is connected with the hot water outlet and the hot water inlet respectively, and is used for conveying the waste gas hot water in the hot water outlet of the exhaust device 2 to the pulp tank 1 through the hot water inlet in the pulp tank 1. Specifically, the hot water of the exhaust gas flowing out from the bottom of the exhaust device 2 can flow out to the pulp tank 1 through the hot water pipe 5.
Wherein, cold water pipe and hot water pipe structure all are the same with prior art with the realization principle, and this embodiment is not repeated herein.
Fig. 2 is a schematic structural diagram of a drying energy-saving system according to a second embodiment of the present invention, and as shown in fig. 2, on the basis of the embodiment shown in fig. 1, the drying energy-saving system according to the second embodiment of the present invention may further include: a fan 6 and a preheat exchanger 7. A blower 6 for blowing cold air to the preheat exchanger 7; and the preheating exchanger 7 is used for preheating cold air and then conveying the cold air into the dryer.
Wherein, the fan 6 can be an air cooler.
Specifically, the exhaust gas temperature is higher in the desiccator, and heat with cold wind after preheating exchanger 7 and supply to the desiccator to the dry gypsum board of heating realizes once recycle of waste heat. According to the energy-saving control system provided by the embodiment of the invention, cold air blown by the fan is preheated by the preheating exchanger and then conveyed into the dryer, so that the heating temperature of the dried gypsum board in the dryer is increased, the energy consumption is reduced, and the production line speed in winter is increased.
In this embodiment, the desiccator waste gas after preheating exchanger 7 still contains a large amount of heats and vapor, at this moment exhaust apparatus 2 with the in-process of waste gas emission to the atmosphere, adopt spray set 3 of installing additional in exhaust apparatus 2 in above-mentioned embodiment, collect the condensation of the medium-high temperature water vapor in the waste gas, the waste gas hot water storage that produces after the condensation is collected is in pulp tank 1, as the hot water source of gypsum ground paste, realize waste heat secondary recycle, and then realize desiccator waste heat recycle.
Further, in the above embodiment, as shown in fig. 2, the drying energy saving system may further include: two ductwork 8, one of which (which may be referred to as a first ductwork) is located between the blower and the preheat exchanger and the other ductwork (which may be referred to as a second ductwork) is located between the preheat exchanger and the dryer.
Specifically, cold air blown by the fan 6 flows into the preheating exchanger 7 through the first air duct, and hot air heated by the preheating exchanger 7 flows into the exhaust device 2 of the dryer through the second air duct.
Wherein, the structure and the realization principle of fan, preheating interchanger and tuber pipe all are the same with prior art, and this embodiment is not repeated herein.
Further, in the above embodiment, as shown in fig. 2, the drying energy saving system may further include: a water storage tank 9 and a hot water pump 10; the hot water pipe 6 is connected to a hot water inlet in the pulp tank 1 via a water storage tank 9 and a hot water pump 10.
And the water storage tank 9 is used for caching the waste gas hot water flowing out of the hot water pipe 5. And the hot water pump 10 is used for conveying the hot water of the waste gas flowing out of the water storage tank 9 to the pulp tank 1.
Specifically, since the waste hot water of the pulp tank 1 is used as the hot water source of the gypsum slurry in the present embodiment, the volume of the waste hot water in the pulp tank 1 determines the temperature of the water in the pulp tank 1, thereby affecting the temperature of the gypsum slurry. This embodiment can be through the waste gas hot water that 9 buffer memory hot-water line of water storage tank flow to make the waste gas hot water in exhaust apparatus 2 in time get rid of, and can irritate 1 required waste gas hot water's capacity according to paper pulp, irritate paper pulp through the hot-water pump with quantitative waste gas hot water output, so that the temperature in the paper pulp is irritated 1 and is satisfied corresponding requirement, and then make gypsum ground paste temperature satisfy corresponding requirement.
Wherein, the structure and the realization principle of water storage tank and hot-water pump all are the same with prior art, and this embodiment is not repeated herein.
To achieve a constant gypsum slurry temperature, the energy efficient control system provided by embodiments of the present invention may also include a temperature control system for achieving control of a constant temperature in the pulp tank. Fig. 3 is a schematic structural diagram of a temperature control system according to an embodiment of the present invention, and as shown in fig. 3, the temperature control system according to the embodiment of the present invention may include: the temperature control system comprises a first temperature sensor, a second temperature sensor and a control system.
And the first temperature sensor is used for acquiring the temperature of the gypsum slurry and transmitting the temperature of the gypsum slurry to the control system.
Specifically, first temperature sensor can set up and pile up the bench or pile up a platform and predetermine the within range, real-time supervision gypsum ground paste temperature holding gypsum ground paste. Optionally, the first temperature sensor may be an infrared temperature measurement sensor.
And the second temperature sensor is used for acquiring the water temperature of the pulp tank and transmitting the water temperature to the control system.
Specifically, the second temperature sensor may be disposed on the pulp tank 1 to monitor the water temperature of the pulp tank 1 in real time. Optionally, the second temperature sensor may be an infrared temperature sensor.
And the control system is used for adjusting the volume of the waste gas hot water in the pulp tank 1 according to the water temperature of the pulp tank 1 and/or the temperature of the gypsum slurry so as to ensure that the temperature of the gypsum slurry is constant at a preset temperature.
In this embodiment, the control system controls the water temperature of the pulp tank 1 and/or the gypsum slurry temperature to control the volume of the waste gas and hot water in the pulp tank 1 in real time, thereby realizing a constant gypsum slurry temperature. Optionally, the control system may be a Programmable Logic Controller (PLC) control system.
Specifically, the control system adjusts the volume of the waste gas and hot water in the pulp tank 1 according to the water temperature of the pulp tank 1 and/or the temperature of the gypsum slurry, and can be realized by the following steps:
the first implementation mode comprises the following steps: comparing the temperature of the gypsum slurry with a preset temperature; when the temperature of the gypsum slurry is higher than the preset temperature, the capacity of waste gas and hot water in the pulp tank 1 is reduced; and when the temperature of the gypsum slurry is lower than the preset temperature, increasing the capacity of the waste gas hot water in the pulp tank 1.
In this embodiment, the capacity of the exhaust hot water in the pulp tank 1 is adjusted according to the temperature of the gypsum slurry. Specifically, the gypsum slurry temperature T1 is monitored in real time through the first temperature sensor, and the preset temperature T is preset. When the temperature of the gypsum slurry T1 is more than T, reducing the volume of waste gas and hot water in the pulp tank; when the temperature T1 of the gypsum slurry is less than T, the capacity of waste gas and hot water in the pulp tank is increased, and the automatic control of the constant temperature of the gypsum slurry is realized.
The preset temperature can be preset in the control system, the preset temperature can be determined according to the actual situation of a production line for producing gypsum boards by using gypsum slurry or the experience of technicians, and generally, the preset temperature can be any temperature value from 35 ℃ to 38 ℃.
The second implementation mode comprises the following steps: comparing the water temperature of the pulp tank 1 with a preset threshold value; when the water temperature of the pulp tank 1 is greater than a preset threshold value, reducing the volume of waste gas hot water in the pulp tank 1; when the water temperature of the pulp tank 1 is less than a preset threshold value, the capacity of the waste gas hot water in the pulp tank 1 is increased.
In this embodiment, the capacity of the exhaust hot water in the pulp tank 1 is adjusted according to the water temperature of the pulp tank 1. Specifically, the water temperature T2 of the pulp tank 1 is monitored in real time by the second temperature sensor, and the preset threshold T0 is obtained. When the water temperature T2 of the pulp tank 1 is more than T0, the volume of the waste gas hot water in the pulp tank 1 is reduced; when the water temperature T2 of the pulp tank 1 is less than T0, the capacity of waste gas hot water in the pulp tank 1 is increased, and the temperature of gypsum slurry is automatically controlled to be constant.
The preset threshold value can be preset or can be changed in real time according to the temperature of the gypsum slurry. The preset threshold value varies in real time according to the temperature of the gypsum slurry as described in the following examples.
The third implementation mode comprises the following steps: comparing the temperature of the gypsum slurry with a preset temperature; when the temperature of the gypsum slurry is higher than the preset temperature, reducing a preset threshold value; and increasing the preset threshold value when the temperature of the gypsum slurry is lower than the preset temperature. Comparing the water temperature of the pulp tank 1 with a preset threshold value; when the water temperature of the pulp tank 1 is greater than a preset threshold value, reducing the volume of waste gas hot water in the pulp tank 1; and when the water temperature of the pulp tank 1 is less than a preset threshold value, increasing the capacity of the waste gas hot water in the pulp tank 1.
In this embodiment, the preset threshold of the water temperature of the pulp tank 1 may be changed in real time according to the temperature of the gypsum slurry, and the capacity of the waste gas hot water in the pulp tank 1 may be adjusted according to the water temperature of the pulp tank 1 and the temperature of the gypsum slurry. Specifically, the temperature of the gypsum slurry is used as an adjustment reference value, and a preset threshold value of the water temperature of the pulp tank 1 is adjusted according to the temperature of the gypsum slurry. The water temperature of the pulp tank 1 is used as a final regulation value, and the capacity of the waste gas hot water in the pulp tank 1 is regulated according to the water temperature of the pulp tank 1. The preset threshold value of the water temperature of the pulp tank 1 can be changed in real time according to the temperature of the gypsum slurry, and the temperature constancy of the gypsum slurry can be automatically controlled
Further, in the above embodiment, when the drying economizer system includes the hot water pipe 5, the hot water pipe 5 in fig. 1 and 2 is provided with the regulating valve. Reducing the volume of waste hot water in the pulp tank 1 may include: the regulating valve is controlled to decrease to reduce the volume of the waste hot water in the pulp tank 1. Increasing the capacity of the waste hot water in the pulp tank 1 may include: the regulating valve is controlled to increase the capacity of the exhaust hot water in the pulp tank 1.
Optionally, the regulating valve is an electric regulating valve.
Specifically, the control system may be connected to the regulating valve, and when it is determined that the volume of the waste gas hot water in the pulp tank 1 needs to be reduced through the gypsum slurry temperature T1> T or the water temperature T2> T0 in the above embodiment, the control system controls the opening of the electric regulating valve to be reduced, and the opening of the electric regulating valve is correspondingly reduced by one for every 1 ℃ higher; when the temperature T1 of the gypsum slurry in the embodiment is less than T or the water temperature T2 of the pulp tank 1 is less than T0, the control system controls the opening of the electric regulating valve to be increased when the capacity of the waste gas hot water in the pulp tank 1 needs to be increased, and the opening of the electric regulating valve is correspondingly increased every 1 ℃, so that the temperature of the gypsum slurry is automatically controlled to be constant.
Further, in the above embodiment, when the drying economizer system includes the hot water pump 10, the reducing the capacity of the exhaust hot water in the pulp tank 1 may include: controlling the frequency of the hot water pump to decrease to reduce the volume of the exhaust hot water in the pulp tank 1; increasing the capacity of the waste hot water in the pulp tank 1 may include: the frequency of the hot water pump is controlled to increase the capacity of the exhaust hot water in the pulp tank 1.
Specifically, the control system may be connected to the hot water pump 10, and when it is determined that the volume of the waste hot water in the pulp tank 1 needs to be reduced through the gypsum slurry temperature T1> T or the water temperature T2> T0 in the above embodiment, the control system controls the frequency of the hot water pump 10 to be reduced, and the frequency of one pump is correspondingly reduced for every 1 ℃ higher; when the temperature of the gypsum slurry T1< T or the water temperature T2< T0 of the pulp tank 1 is judged to increase the capacity of the waste gas hot water in the pulp tank 1, the control system controls the frequency of the hot water pump 10 to increase, and the frequency of one pump is correspondingly increased every 1 ℃ lower, so that the temperature of the gypsum slurry is automatically controlled to be constant.
According to the energy-saving control system provided by the embodiment of the invention, the waste heat of the drying machine is recycled through the drying energy-saving system, and the temperature of the gypsum slurry is controlled to be constant through the control system, so that the water vapor content in the waste gas discharged by the drying machine is greatly reduced, and meanwhile, the recycling of water resources is realized. Secondly, the temperature of the formed wet gypsum board is higher, and the temperature required by heating and drying after the wet gypsum board enters a dryer is lower than that before, so that the coal consumption is saved. And thirdly, the heat of the waste gas in the dryer and the hot water in the waste gas are recovered and conveyed to a batching system (such as a mixer), the temperature of the paper pulp water and the temperature of the foaming agent clear water are increased, and then the temperature of the gypsum slurry is increased to a preset temperature (such as any temperature value of 35-38 ℃), so that the hydration crystallization forming of the semi-hydrated gypsum and the stability of the gypsum board production are greatly facilitated, the automatic control of the temperature of the gypsum slurry of the batching system is realized, and the hydration quality of the gypsum board and the stability of the board quality are directly improved. Fourthly, the evaporation load of the dryer is reduced under the same production condition, and the energy consumption is greatly saved.
The energy-saving control system provided by the embodiment of the invention can also be used in production lines for producing corresponding boards by other slurries, so as to realize energy saving and constant slurry temperature during board drying, and is not limited to production lines for producing gypsum boards by gypsum slurries.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (9)
1. An energy-saving control system, which is suitable for a production line for producing gypsum boards by using gypsum slurry, is characterized by comprising: drying economizer system, drying economizer system includes desiccator and pulp filling, wherein:
the dryer comprises an exhaust device, wherein a spraying device is arranged in the exhaust device and is used for condensing high-temperature water vapor in the waste gas to form waste gas hot water;
wherein the exhaust gas is water vapor generated by the dryer drying the gypsum board;
the pulp tank is used for storing the waste gas hot water, and the waste gas hot water stored in the pulp tank is used as a hot water source of the gypsum slurry;
the energy-saving control system further comprises a temperature control system, the temperature control system comprising: the temperature control system comprises a first temperature sensor, a second temperature sensor and a control system;
the first temperature sensor is used for acquiring the temperature of the gypsum slurry and transmitting the temperature of the gypsum slurry to the control system;
the second temperature sensor is used for acquiring the water temperature of the pulp tank and transmitting the water temperature to the control system;
the control system is used for adjusting the capacity of waste gas hot water in the pulp tank according to the water temperature and/or the gypsum slurry temperature so as to enable the gypsum slurry temperature to be constant at a preset temperature;
the control system adjusts the volume of waste gas hot water in the pulp tank according to the water temperature and/or the gypsum slurry temperature, and comprises:
comparing the water temperature with a preset threshold value; when the water temperature is greater than the preset threshold value, reducing the volume of waste gas hot water in the pulp tank; increasing the volume of the waste hot water in the pulp tank when the water temperature is less than the preset threshold value;
alternatively, the first and second electrodes may be,
said adjusting the volume of waste gas hot water in said pulp tank based on said water temperature and/or said gypsum slurry temperature comprises:
comparing the gypsum slurry temperature to the preset temperature; when the temperature of the gypsum slurry is higher than the preset temperature, reducing the capacity of waste gas and hot water in the pulp tank; and when the temperature of the gypsum slurry is lower than the preset temperature, increasing the capacity of waste gas hot water in the pulp tank.
2. The economizer control system of claim 1 wherein the dry economizer system further comprises: a hot water pipe;
the exhaust device is provided with a hot water outlet, and the pulp tank is provided with a hot water inlet; the hot water pipe is respectively connected with the hot water outlet and the hot water inlet and is used for conveying the waste gas hot water in the hot water outlet of the exhaust device to the pulp tank through the hot water inlet in the pulp tank.
3. The economizer control system of claim 2 wherein the dry economizer system further comprises: a blower and a preheat exchanger;
the fan is used for blowing cold air to the preheating exchanger;
and the preheating exchanger is used for preheating the cold air and then conveying the cold air to the dryer.
4. The energy saving control system of claim 3, the drying energy saving system further comprising: and one air pipe is positioned between the fan and the preheating exchanger, and the other air pipe is positioned between the preheating exchanger and the dryer.
5. The economizer control system of claim 4 wherein the dry economizer system further comprises: a water storage tank and a hot water pump; the hot water pipe is connected with a hot water inlet in the pulp tank through the water storage tank and the hot water pump;
the water storage tank is used for caching the waste gas hot water flowing out of the hot water pipe;
and the hot water pump is used for conveying the waste gas hot water flowing out of the water storage tank to the pulp tank.
6. The economizer control system of claim 1 wherein prior to the control system comparing the water temperature to a preset threshold, further comprising:
comparing the gypsum slurry temperature to the preset temperature;
when the temperature of the gypsum slurry is higher than the preset temperature, reducing the preset threshold value;
and when the temperature of the gypsum slurry is lower than the preset temperature, increasing the preset threshold value.
7. The energy saving control system of claim 2, wherein a regulating valve is provided in the hot water pipe;
the reducing the waste hot water capacity of the pulp tank, comprising: controlling the regulating valve to decrease to reduce the capacity of the waste hot water in the pulp tank;
the increasing the capacity of the waste hot water in the pulp tank, comprising: controlling the regulating valve to increase the capacity of the waste hot water in the pulp tank.
8. The economizer control system of claim 7 wherein the regulator valve is an electric regulator valve.
9. The economizer control system of claim 2 wherein the dry economizer system further comprises: a water storage tank and a hot water pump; the hot water pipe is connected with a hot water inlet in the pulp tank through the water storage tank and the hot water pump;
the reducing the waste hot water capacity of the pulp tank, comprising: controlling the frequency of the hot water pump to decrease to reduce the volume of waste hot water in the pulp tank;
the increasing the capacity of the waste hot water in the pulp tank, comprising: controlling the frequency of the hot water pump to increase the volume of exhaust hot water in the pulp tank.
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| CN113368752B (en) * | 2021-05-28 | 2022-09-30 | 北新建材(天津)有限公司 | Auxiliary material adding system utilizing waste heat of drying machine |
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| EP0284464A1 (en) * | 1987-03-16 | 1988-09-28 | René Bergounhon | Furnace for the dehydration of powders, sand and agglomerates |
| CN103643969A (en) * | 2013-12-12 | 2014-03-19 | 安徽理工大学 | High-strength and low-energy-consumption coal mine wet spraying system and method |
| CN107263689A (en) * | 2016-04-06 | 2017-10-20 | 北新集团建材股份有限公司 | A kind of drying machine waste heat recycling system and method |
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