Energy-saving and consumption-reducing book and periodical printing centralized air supply system and control method thereof

Abstract

The application discloses an energy-saving and consumption-reducing centralized air supply system for book and periodical printing, which comprises an air compression unit, an air supply control unit, an air use unit, a waste heat recovery control unit and a waste heat utilization unit. The air compression unit is used for compressing inhaled air. The air supply control unit is used for storing, transforming pressure and supplying compressed air. The air compression unit is communicated with the air supply control unit through an air supply pipeline. The air supply control unit is communicated with the air use unit through the air supply pipeline. The air compression unit is communicated with the waste heat recovery control unit through a water circulation pipeline. The waste heat recovery control unit is communicated with the waste heat utilization unit through the water circulation pipeline. The air compression unit, the air supply control unit and the waste heat recovery control unit are arranged in an independent soundproof room. The centralized air supply system is formed by adopting high-performance air supply devices and equipment to avoid energy loss caused by dispersed air supply. The waste heat is effectively recycled and utilized, so that the comprehensive energy consumption is saved by about 70% compared with traditional air supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing auxiliary equipment, in particular to an energy-saving and consumption-reducing centralized air supply system for book and periodical printing and a control method thereof. BACKGROUND

[0002] With the continuous progress and development of printing technology, the printing industry has become an important part of the national economy. China has become the second largest printing market in the world, and developing green printing has become a way for the printing industry to develop energy-saving and low-carbon economy.

[0003] In the prior art, in the printing production and post-processing process, printing enterprises will use a large number of air pumps, vacuum pumps and combined air pumps to assist production. The air pump is mainly a rotary vane pump, and the following problems exist: the efficiency is not high, the running load rate is relatively low, there are dozens or even hundreds of small pumps in the printing and post-processing workshops, which consume a large amount of energy and generate a large amount of heat; the carbon sheet of the rotary vane pump is easy to wear and tear, and needs to be replaced regularly, which has a high production cost; the long-term use of the air pump causes insufficient vacuum degree and blowing force, which seriously affects the production efficiency. At the same time, the air pump is directly placed in the production workshop, and the noise during operation is very loud; workers working in a high-noise environment for a long time are prone to hearing loss, which directly affects the retention of enterprise employees, in addition, the heat generated by the air pump is directly dissipated in the production environment, and the heat is directly wasted and cannot be recycled.

[0004] Therefore, it is urgent to develop a new centralized air supply system to solve the defects of traditional printing production decentralized air supply, reduce energy consumption, and make the air supply more stable, lower maintenance cost, and achieve the purpose of green and clean printing production. SUMMARY

[0005] The present application relates to the technical field of printing auxiliary equipment, in particular to an energy-saving and consumption-reducing centralized air supply system for book and periodical printing and a control method thereof.

[0006] To solve the above technical problems, the technical solutions provided by the present application are as follows:

[0007] A centralized air supply system for book and periodical printing that saves energy and reduces consumption comprises an air compression unit, an air supply control unit, an air using unit, a waste heat recovery control unit and a waste heat utilization unit, wherein the air compression unit is used to compress the inhaled air, and the air supply control unit is used to store, transform the pressure and supply compressed air, the air compression unit is connected to the air supply control unit via an air transmission pipeline, the air supply control unit is connected to the air using unit via an air transmission pipeline, the air using unit is provided with an exhaust device, the air transmission pipeline is provided with an electric-controlled valve, the air compression unit is connected to the waste heat recovery control unit via a water circulation pipeline, the waste heat recovery control unit is connected to the waste heat utilization unit via a water circulation pipeline, the water circulation pipeline is provided with an electric-controlled valve, the air compression unit, the air supply control unit and the waste heat recovery control unit are arranged in an independent soundproof room.

[0008] Furthermore, the air compression unit includes an air intake device, a compression device, an oil-gas separation device and a filtering device. The air intake device is connected to the compression device through an air pipeline. The compression device is a variable frequency oil-injected screw compressor. The compression device is connected to the oil-gas separation device through an air pipeline. The oil-gas separation device is used to separate oil and compressed air. The oil-gas separation device is connected to the compression device through an oil pipeline and supplies oil. The oil-gas separation device is connected to the filtering device through an air pipeline. The filtering device is used to filter water vapor in the compressed air.

[0009] Furthermore, the air supply control unit includes a primary air tank, a secondary air tank, a variable frequency blower, a pressure transmitter and a controller. The primary air tank is connected to the filtering device of the air compression unit through an air pipeline. The primary air tank is connected to the pressure transmitter through an air pipeline. The pressure transmitter is connected to the variable frequency blower through an air pipeline. The variable frequency blower is connected to the secondary air tank through an air pipeline. The primary air tank, the secondary air tank, the variable frequency blower and the pressure transmitter are all electrically connected to the controller.

[0010] Furthermore, the gas-using unit includes prepress platemaking equipment, printing equipment and postpress processing equipment. The prepress platemaking equipment, the printing equipment and the postpress processing equipment are respectively connected to the variable frequency blower through gas pipelines, and the connected gas pipelines are provided with the electric control valve and pressure gauge. The prepress platemaking equipment, the printing equipment and the postpress processing equipment are respectively connected to the exhaust device.

[0011] Furthermore, the waste heat recovery control unit includes a compressed air heat recovery exchange device, an oil heat recovery exchange device, a cooling device, and a water circulation device. The compressed air heat recovery exchange device is arranged on the air pipeline connecting the oil-gas separation device and the filtering device, the oil heat recovery exchange device is arranged on the oil pipeline connecting the oil-gas separation device and the compression device, the water circulation device is connected to the compressed air heat recovery exchange device and the oil heat recovery exchange device, the cold water end of the water circulation device is connected to the tap water pipeline, the hot water end of the water circulation device is connected to the waste heat utilization unit, and the cooling device is arranged on the air pipeline at the filtering device end and on the oil pipeline at the compression device end.

[0012] Furthermore, the waste heat utilization unit includes a steam-driven refrigeration device, a shower and a washbasin, and the steam-driven refrigeration device, the shower and the washbasin are all connected to the hot water end of the water circulation device.

[0013] Furthermore, there are at least two sets of air compression units, and the at least two sets of air compression units are connected in parallel to the first-level air storage tank. There is at least one first-level air storage tank, and when the number of the first-level air storage tanks is greater than one, the first-level air storage tanks are connected in parallel.

[0014] Furthermore, the secondary gas storage tank and the variable frequency blower are both provided in plurality and correspond one to one.

[0015] A method for controlling a centralized air supply system for book and periodical printing with energy saving and consumption reduction, specifically comprising the following steps:

[0016] Start, turn on the air compression unit and the waste heat recovery control unit related devices to make them operate normally, and set the pressure value of each control node of the air supply control unit through the controller;

[0017] Air supply: when the pressure value of each control node of the air supply control unit reaches the preset value, air is supplied to the equipment of the air-consuming unit, and the signal feedback of the pressure transmitter is used to ensure the stable supply of compressed air;

[0018] Pressure stabilization: When the equipment in the air-consuming unit consumes compressed air through air intake and exhaust, the controller controls the pressure of each air supply node to be stable, feeds back pressure information to the air compression unit, and adjusts the compression frequency of the compression device to achieve stable air supply pressure;

[0019] Waste heat recovery: when the air compression unit is operating normally, the waste heat recovery control unit performs heat exchange to recover the waste heat of the compressed air and oil, stores the recovered heat in the circulating water of the water circulation device, and supplies it to the waste heat utilization unit;

[0020] Shutdown: When production is suspended due to holidays or other reasons, the centralized gas supply system stops operating.

[0021] The beneficial effects of the present invention are:

[0022] This invention utilizes a high-performance air supply system and equipment, installing the centralized air supply system within the centralized air supply equipment room. This system centrally supplies air to printing and post-press equipment, avoiding energy loss caused by decentralized air supply. This makes centralized air supply more stable and simplifies equipment maintenance. Furthermore, it transfers noise generated by the air pump from inside the workshop to outside, effectively recovering waste heat. This reduces the heat load of air conditioning and improves the environment in the printing production workshop, while also allowing for daily production and living heat utilization. This reduces overall energy consumption by approximately 70% compared to traditional air supply systems.

[0023] After adopting the printing centralized air supply system, the centralized air supply system can achieve 24-hour uninterrupted air supply through the rotation of spare equipment, greatly improving the operating efficiency of printing production equipment, greatly reducing equipment energy consumption, avoiding printing failures caused by air supply, effectively reducing printing production costs, and enhancing the company's market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the system structure of the present invention.

[0025] Figure: 1. Air compression unit, 101. Air intake device, 102. Compression device, 103. Oil-gas separation device, 104. Filter device, 2. Air supply control unit, 201. Primary air storage tank, 202. Secondary air storage tank, 203. Variable frequency blower, 204. Pressure transmitter, 205. Controller, 206. Electric control valve, 207. Pressure gauge, 3. Air use unit, 301. Prepress platemaking equipment, 302. Printing equipment, 303. Postpress processing equipment , 304. Exhaust device, 4. Waste heat recovery control unit, 401. Compressed air heat recovery exchange device, 402. Oil heat recovery exchange device, 403. Cooling device, 404. Water circulation device, 5. Waste heat utilization unit, 501. Steam-driven refrigeration device, 502. Shower, 503. Washbasin, 504. Electric heating device, 6. Gas pipeline, 7. Water circulation pipeline, 8. Oil pipeline, 9. Tap water pipeline, 10. Air-conditioning pipeline, 11. Office. DETAILED DESCRIPTION

[0026] For the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved, the technical solutions of the present application are further illustrated below in conjunction with the accompanying drawings and through specific embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the present application, but not to limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, but not all.

[0027] In the description of the present application, unless explicitly defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the present application, unless explicitly defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] In the description of the present embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the purpose of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0030] The technical solutions of the present application are further illustrated below in conjunction with the accompanying drawings and through specific embodiments.

[0031] As Figure 1As shown, the embodiment discloses an energy-saving and consumption-reducing book printing centralized air supply system, which comprises an air compression unit 1, an air supply control unit 2, an air use unit 3, a waste heat recovery control unit 4 and a waste heat utilization unit 5, the air compression unit 1 is used for compressing the inhaled air, the air supply control unit 2 is used for storing, transforming pressure and supplying compressed air, the air compression unit 1 is communicated with the air supply control unit 2 through an air conveying pipeline 6, the air supply control unit 2 is communicated with the air use unit 3 through the air conveying pipeline 6, the air use unit 3 is provided with an exhaust device 304, an electric control valve 601 is arranged on the air conveying pipeline 6, the air compression unit 1 is communicated with the waste heat recovery control unit 4 through a water circulation pipeline 7, the waste heat recovery control unit 4 is communicated with the waste heat utilization unit 5 through the water circulation pipeline 7, an electric control valve 701 is arranged on the water circulation pipeline 7, and the air compression unit 1, the air supply control unit 2 and the waste heat recovery control unit 4 are arranged in an independent soundproof room.

[0032] In the embodiment, the air compression unit 1 comprises an air inlet device 101, a compression device 102, an oil-gas separation device 103 and a filtering device 104, the air inlet device 101 is communicated with the compression device 102 through the air conveying pipeline 6, the compression device 102 is a variable frequency oil injection screw compressor, the screw is cooled by oil to ensure the service life of the compression device 102, the compression device 102 is communicated with the oil-gas separation device 103 through the air conveying pipeline 6, the mixture of compressed air and oil is input into the oil-gas separation device 103 through the air conveying pipeline 6, the oil-gas separation device 103 is used for separating oil and compressed air, the oil-gas separation device 103 is communicated with the compression device 102 through an oil conveying pipeline 8 and supplies oil, so that the separated oil is recycled into the compression device 102 after treatment, and the oil-gas separation device 103 is communicated with the filtering device 104 through the air conveying pipeline 6, the filtering device 104 is used for filtering water vapor in the compressed air and drying the compressed air.

[0033] As shown in the figure, Figure 1 In the embodiment, two sets of air compression units 1 in parallel communication with the primary air tank 201 are adopted to supply compressed air, so that the air use in the full load working of all production equipment is realized, with the decrease or stop of the air use of part of the production equipment, the compression frequency of the compression device 102 is reduced under the action of the frequency converter, and the power consumption is reduced, with the continuous decrease of the air use, one of the two sets of parallel compression devices 102 will stop working, so as to further reduce the power consumption. However, with the increase of the production equipment, the number of air compression units 1 will also increase correspondingly, and the same parallel communication with the primary air tank 201,

[0034] The air supply control unit 2 comprises a primary air tank 201, a secondary air tank 202, a variable frequency air blower 203, a pressure transmitter 204 and a controller 205, the primary air tank 201 is communicated with the filter device 104 of the air compression unit 1 through the air conveying pipeline 6, the primary air tank 201 is communicated with the pressure transmitter 204 through the air conveying pipeline 6, the pressure transmitter 204 is communicated with the variable frequency air blower 203 through the air conveying pipeline 6, the variable frequency air blower 203 is communicated with the secondary air tank 202 through the air conveying pipeline 6, and the primary air tank 201, the secondary air tank 202, the variable frequency air blower 203 and the pressure transmitter 204 are electrically communicated with the controller 205.

[0035] The secondary air tank 202 and the variable frequency air blower 203 are provided in plurality and one-to-one correspondence, and three sets of variable frequency air blowers 203 and corresponding secondary air tanks 202 are provided in the embodiment, which correspond to the pre-press equipment 301, the printing equipment 302 and the post-processing equipment 303 of the air consumption unit 3 respectively, the pre-press equipment 301, the printing equipment 302 and the post-processing equipment 303 are communicated with the secondary air tank 202 through the air conveying pipeline 6, and the air conveying pipeline 6 is provided with the electric control valve 206 and the pressure gauge 207, and the pre-press equipment 301, the printing equipment 302 and the post-processing equipment 303 are communicated with the exhaust device 304 respectively. When the printing equipment 302 and / or the post-processing equipment increases, one set of variable frequency air blower 203 and the corresponding secondary air tank 202 may not be able to keep up with the air consumption, so one or more sets of variable frequency air blowers 203 and the corresponding secondary air tanks 202 can be added according to actual needs to ensure the air supply, and the primary air tank 201 can also be increased accordingly according to needs.

[0036] The waste heat recovery control unit 4 comprises a compressed air heat recovery exchange device 401, an oil heat recovery exchange device 402, a cooling device 403, and a water circulation device 404. The compressed air heat recovery exchange device 401 is arranged on the gas pipeline 6 communicated between the oil-gas separation device 103 and the filtering device 104, for recovering heat of compressed air and cooling the compressed air. The oil heat recovery exchange device 402 is arranged on the oil pipeline 8 communicated between the oil-gas separation device 103 and the compression device 102, for recovering heat of oil and cooling the oil. The water circulation device 404 is communicated with the compressed air heat recovery exchange device 401 and the oil heat recovery exchange device 402, and converts the waste heat recovered by the two devices into heat energy in circulating water, so that the water temperature reaches 90℃ or above. The cold water end of the water circulation device 404 is communicated with a tap water pipeline 9, and the hot water end of the water circulation device 404 is communicated with the waste heat utilization unit 5. The cooling device 403 is arranged on the gas pipeline 6 at the filtering device 104 end and the oil pipeline 8 at the compression device 102 end, for further cooling the compressed air and oil after heat recovery by the heat exchange device to normal working temperature.

[0037] The waste heat utilization unit 5 comprises a steam-driven refrigeration device 501, a shower 502, a washing device 503, and an electric heating device 504, all of which are communicated with the hot water end of the water circulation device 404. In high-temperature weather, the hot water of the water circulation device 404 provides kinetic energy for the steam-driven refrigeration device 501 to cool the office 11, while in low-temperature weather, the hot water of the water circulation device 404 provides heat energy for the electric heating device 504 to heat the office 11. When the hot water of the water circulation device 404 is supplied to the shower 502 and the washing device 503, the daily washing hot water and kitchen hot water for workers in the production site can be ensured, so that the utilization rate of electric energy in the production site is maximized.

[0038] An energy-saving and consumption-reducing book and journal printing centralized air supply system control method, specifically comprising the following steps:

[0039] Starting, starting the air compression unit 1 and the related devices of the waste heat recovery control unit 4, so that they normally operate, and setting the pressure values of the control nodes of the air supply control unit 2 through the controller 205;

[0040] Air supply, when the pressure values of the control nodes of the air supply control unit 2 reach the preset values, the equipment of the air use unit 3 is supplied with air, and the stable supply of compressed air is ensured through the signal feedback of the pressure transmitter 204;

[0041] Pressure stabilization, when the equipment of the gas using unit 3 consumes compressed air by gas using and exhausting, the controller 205 controls the pressure stabilization of each gas supply node, feeds back the pressure information to the air compression unit 1 and adjusts the compression frequency of the compression device 102 to realize the pressure stabilization of the gas supply;

[0042] Waste heat recovery, when the air compression unit 1 normally operates, the waste heat recovery control unit 4 exchanges and recovers the waste heat of the compressed air and oil, stores the recovered heat in the circulating water of the water circulating device 404 and supplies the waste heat utilization unit 5;

[0043] Shutdown, when the production is suspended due to holidays or other needs, the centralized gas supply system stops operating.

[0044] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited by the above embodiments, and various changes and changes can be made without departing from the spirit and scope of the present application, and these changes and changes fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A centralized air supply system for book and periodical printing that saves energy and reduces consumption, characterized by: It includes an air compression unit, an air supply control unit, an air using unit, a waste heat recovery control unit and a waste heat utilization unit, wherein the air compression unit is used to compress the inhaled air, the air supply control unit is used to store, transform the pressure and supply the compressed air, the air compression unit is connected to the air supply control unit through an air transmission pipeline, the air supply control unit is connected to the air using unit through an air transmission pipeline, the air using unit is provided with an exhaust device, the air transmission pipeline is provided with an electric control valve, the air compression unit is connected to the waste heat recovery control unit through a water circulation pipeline, the waste heat recovery control unit is connected to the waste heat utilization unit through a water circulation pipeline, the water circulation pipeline is provided with an electric control valve, the air compression unit, the air supply control unit and the waste heat recovery control unit are arranged in an independent soundproof room; Wherein: the air compression unit includes an air intake device, a compression device, an oil-gas separation device and a filtering device, the air intake device is connected to the compression device through an air pipeline, the compression device is connected to the oil-gas separation device through an air pipeline, the oil-gas separation device is used to separate oil and compressed air, the oil-gas separation device is connected to the compression device through an oil pipeline and supplies oil, the oil-gas separation device is connected to the filtering device through an air pipeline, and the filtering device is used to filter water vapor in the compressed air; The waste heat recovery control unit includes a compressed air heat recovery exchange device, an oil heat recovery exchange device, a cooling device, and a water circulation device. The compressed air heat recovery exchange device is arranged on the air pipeline connecting the oil-gas separation device and the filtering device, the oil heat recovery exchange device is arranged on the oil pipeline connecting the oil-gas separation device and the compression device, the water circulation device is connected to the compressed air heat recovery exchange device and the oil heat recovery exchange device, the cold water end of the water circulation device is connected to the tap water pipeline, the hot water end of the water circulation device is connected to the waste heat utilization unit, and the cooling device is arranged on the air pipeline at the filtering device end and on the oil pipeline at the compression device end.

2. The energy-saving and consumption-reducing centralized air supply system for book and periodical printing according to claim 1 is characterized by: The compression device is a variable frequency oil-injected screw compressor.

3. The energy-saving and consumption-reducing centralized air supply system for book and periodical printing according to claim 1 is characterized in that: The air supply control unit includes a primary air tank, a secondary air tank, a variable frequency blower, a pressure transmitter and a controller. The primary air tank is connected to the filtering device of the air compression unit through an air pipeline. The primary air tank is connected to the pressure transmitter through an air pipeline. The pressure transmitter is connected to the variable frequency blower through an air pipeline. The variable frequency blower is connected to the secondary air tank through an air pipeline. The primary air tank, the secondary air tank, the variable frequency blower and the pressure transmitter are all electrically connected to the controller.

4. The energy-saving and consumption-reducing centralized air supply system for book and periodical printing according to claim 3 is characterized by: The gas-using unit includes pre-press platemaking equipment, printing equipment and post-press processing equipment. The pre-press platemaking equipment, the printing equipment and the post-press processing equipment are respectively connected in parallel with the variable frequency blower through gas pipelines, and the connected gas pipelines are provided with the electric-controlled valve. The pre-press platemaking equipment, the printing equipment and the post-press processing equipment are respectively connected to the exhaust device.

5. The energy-saving and consumption-reducing centralized air supply system for book and periodical printing according to claim 1 is characterized by: The waste heat utilization unit includes a steam-driven refrigeration device, a shower and a wash basin, and the steam-driven refrigeration device, the shower and the wash basin are all connected to the hot water end of the water circulation device.

6. The energy-saving and consumption-reducing centralized air supply system for book and periodical printing according to claim 3 is characterized by: There are at least two sets of the air compression units, and at least two sets of the air compression units are connected in parallel to the first-level air storage tank. There is at least one first-level air storage tank, and when the number of the first-level air storage tanks is greater than one, the first-level air storage tanks are connected in parallel.

7. The energy-saving and consumption-reducing centralized air supply system for book and periodical printing according to claim 3 is characterized by: The secondary gas storage tank and the variable frequency blower are both provided in plurality and correspond one to one.

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