A steam condensate water waste heat recovery and utilization system based on multi-device cooperation

Abstract

The utility model discloses a steam condensate water waste heat recycling system based on multiple equipment cooperation, including heat source unit, heat using unit, waste heat recovery unit, steam buffer and supply unit and intelligent control unit, heat source unit is paperboard line and / or soft printing machine, heat using unit is coating machine and moisture regaining machine, waste heat recovery unit is connected with heat using unit through main delivery pipe and recovers condensate water recovery device, steam buffer and supply unit are communicated with steam gas tank, natural gas boiler and main delivery pipe through supply pipe, and intelligent control unit monitors data through temperature, pressure sensor, and controls electric regulating valve on main delivery pipe and supply pipe to carry out intelligent switching. The utility model realizes the closed recovery, long-distance transportation and direct utilization of high-temperature steam condensate water waste heat, automatically switches boiler supply when waste heat is insufficient, effectively solves the problems of serious waste of waste heat, low utilization efficiency and poor system stability, and has remarkable energy saving and economic value.

Description

Technical Field

[0001] This utility model relates to the field of industrial waste heat recovery technology, and in particular to a steam condensate waste heat recovery and utilization system based on multi-device collaboration. Background Technology

[0002] In the existing corrugated cardboard production process, the cardboard line and flexographic printing machine require a large amount of steam for heating. The high-temperature and high-pressure steam condensate generated is only partially recovered into the boiler soft water tank, and the remaining part is discharged because it cannot be directly utilized, resulting in a waste of water resources and heat energy.

[0003] Meanwhile, the coating machines and rehumidifiers on the production line are generally supplied with steam by natural gas boilers to operate continuously and stably. Because the energy of each piece of equipment operates independently and lacks coordination, the operating costs are high.

[0004] Therefore, there is an urgent need for a system that can efficiently, directly, and stably utilize the waste heat of existing high-temperature steam condensate and achieve intelligent collaborative distribution among multiple devices. Utility Model Content

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A steam condensate waste heat recovery and utilization system based on multi-device collaboration is characterized by comprising a heat source unit, a heat consumption unit, a waste heat recovery unit, a steam buffer and replenishment unit, and an intelligent control unit.

[0007] The steam buffer and replenishment unit includes a steam storage tank, a steam distribution cylinder, and a natural gas boiler;

[0008] The heat source unit includes a paperboard line and / or a flexographic printing machine for generating high-temperature steam condensate;

[0009] The heat-using unit includes a coating machine and a dehumidifier that require a heat source;

[0010] The waste heat recovery unit includes a condensate recovery device and a high-temperature pump;

[0011] The steam outlet of the natural gas boiler is connected to the heat source unit and the steam storage tank respectively through the steam distribution cylinder, and the water inlet is connected to the condensate recovery device and the water outlet of the heat-using unit through the return water tank.

[0012] The inlet of the condensate recovery device is connected to the condensate outlet of the heat source unit through a waste heat recovery pipe, and its steam outlet is connected to the steam inlet of the heat-using unit through a main conveying pipe. A high-temperature pump is installed on its outlet.

[0013] The steam outlet of the steam storage tank is connected to the steam inlet of the heat-using unit via a supply pipe.

[0014] The intelligent control unit includes a control module, as well as a pressure sensor, a temperature sensor, an electric proportional valve, and an electric valve that are connected to the control module via signals.

[0015] The pressure sensor, temperature sensor, and electric proportional valve are respectively installed on the main delivery pipe;

[0016] The electric valve is installed on the supply pipe.

[0017] Preferably, the outlet of the steam storage tank is connected to the inlet of the condensate recovery device via a secondary conveying pipe.

[0018] Preferably, the supply pipe is equipped with a pressure reducing valve assembly electrically connected to the control module.

[0019] Preferably, the supply pipe, main delivery pipe, and waste heat recovery pipe are all insulated pressure pipes.

[0020] Preferably, the condensate recovery device is a closed pressure vessel.

[0021] Preferably, the intelligent control unit is configured as follows:

[0022] When the temperature sensor and pressure sensor detect that the steam temperature is not lower than 90°C and the pressure is not lower than 2.5 kg, the control module controls the electric proportional valve to open and the electric valve to close.

[0023] When the steam temperature is detected to be below 80°C and the pressure is below 2kg, the control module controls the electric proportional valve to close and the electric valve to open.

[0024] Preferably, a check valve is installed on the main delivery pipe and the supply pipe at the end closest to the heat-using unit.

[0025] Preferably, a water pump is installed on the pipeline connecting the natural gas boiler and the return water tank.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. By using a closed-loop high-pressure recovery and direct utilization method, the sensible heat of high-temperature steam condensate is maximized, avoiding heat loss in intermediate stages and significantly reducing natural gas consumption and production costs.

[0028] 2. By buffering the fluctuations of the heat source unit through the steam storage tank and achieving seamless switching between waste heat and boiler steam through intelligent control, the continuity and stability of steam for the coating machine and the rehumidifier are ensured, thus guaranteeing product quality.

[0029] 3. It can make intelligent decisions based on the steam temperature and pressure output by the waste heat recovery unit, giving priority to the use of free waste heat, and automatically supplementing boiler steam when insufficient, thus realizing intelligent coordination and optimized allocation of energy supply among multiple devices. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] The components include: heat source unit 1, heat use unit 2, waste heat recovery unit 3, steam buffer and replenishment unit 4, return water tank 5, waste heat recovery pipe 6, main delivery pipe 7, replenishment pipe 8, control module 9, pressure sensor 10, temperature sensor 11, electric proportional valve 12, electric valve 13, secondary delivery pipe 14, pressure reducing valve group 15, check valve 16, feed water pump 17, condensate recovery device 31, high temperature pump 32, steam storage tank 41, steam distribution cylinder 42, and natural gas boiler 43. Detailed Implementation

[0032] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," "front," "back," and similar expressions used in this document are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0036] like Figure 1As shown, a steam condensate waste heat recovery and utilization system based on multi-device collaboration includes a heat source unit 1, a heat use unit 2, a waste heat recovery unit 3, a steam buffer and replenishment unit 4, and an intelligent control unit.

[0037] The steam buffer and replenishment unit 4 includes a steam storage tank 41, a steam distribution cylinder 42, and a natural gas boiler 43;

[0038] The heat source unit 1 includes a paperboard line and / or a flexographic printing machine for generating high-temperature steam condensate;

[0039] The heat-using unit 2 includes a coating machine and a dehumidifier that require heat sources;

[0040] The waste heat recovery unit 3 includes a condensate recovery device 31 and a high-temperature pump 32;

[0041] The steam outlet of the natural gas boiler 43 is connected to the heat source unit 1 and the steam storage tank 41 respectively through the steam distribution cylinder 42, and the water inlet is connected to the condensate recovery device 31 and the water outlet of the heat use unit 2 through the return water tank 5.

[0042] The inlet of the condensate recovery device 31 is connected to the condensate outlet of the heat source unit 1 through the waste heat recovery pipe 6, and its steam outlet is connected to the steam inlet of the heat-using unit 2 through the main conveying pipe 7. A high-temperature pump 32 is installed on its outlet.

[0043] The steam outlet of the steam storage tank 41 is connected to the steam inlet of the heat-using unit 2 via the supply pipe 8.

[0044] The intelligent control unit includes a control module 9, and a pressure sensor 10, a temperature sensor 11, an electric proportional valve 12, and an electric valve 13 that are connected to the control module 9 by signal.

[0045] The pressure sensor 10, temperature sensor 11 and electric proportional valve 12 are respectively installed on the main delivery pipe 7;

[0046] The electric valve 13 is installed on the supply pipe 8.

[0047] In this embodiment, the condensate recovery device 31 is used to separate steam and condensate from the high-temperature steam condensate; the pressure sensor 10 is used to detect the steam pressure of the main delivery pipe 7 in real time; the temperature sensor 11 is used to detect the steam temperature of the main delivery pipe 7 in real time; the electric proportional valve 12 is used to control the on / off state and flow rate of the main delivery pipe 7; the electric valve 13 is used to control the on / off state of the supply pipe 8; and the control module 9 is used to receive signals from the temperature sensor 11 and the pressure sensor 10 to control the opening and closing of the electric proportional valve 12 and the electric valve 13.

[0048] In this embodiment, the steam storage tank 41 is used to absorb load fluctuations, stabilize steam pressure, and provide stable and reliable steam for the coating machine and the rehumidifier, ensuring the stable and continuous operation of the production line.

[0049] Working principle: The high-temperature steam condensate generated by the cardboard line and flexographic printing machine enters the condensate recovery device 31 through the waste heat recovery pipe 6; then the condensate recovery device 31 performs gas-water separation, and the separated condensate is pumped to the return water tank 5 by the high-temperature pump 32, while the separated steam is kept in the condensate recovery device 31 or enters the heat use unit 2 through the main conveying pipe 7.

[0050] When the steam temperature (T) and pressure (P) are both greater than the set values, the control module 9 determines that the residual heat is sufficient and controls the electric proportional valve 12 to open according to the set ratio, while simultaneously closing the electric valve 13. The heating unit 2 prioritizes the use of free residual heat. When the steam temperature (T) and pressure (P) are less than the set values, the control module 9 determines that the residual heat is insufficient. At this time, it controls the electric proportional valve 12 to close and the electric valve 13 to open, switching to steam supplied by the steam storage tank 41 and the natural gas boiler 43 for heating, ensuring uninterrupted production.

[0051] The condensate from the coating machine and the dehumidifier flows back to the natural gas boiler 43 through the return water tank 5; the condensate separated from the condensate recovery device 31 is pumped to the return water tank 5 through the high-temperature pump 32; thus, the closed-loop recovery, long-distance transportation and priority direct utilization of the waste heat of the high-temperature steam condensate are realized. When the waste heat is insufficient, the boiler feed is automatically switched, which effectively solves the problems of serious waste heat waste, low utilization efficiency and poor system stability, and has significant energy saving, consumption reduction and economic value.

[0052] In this embodiment, the high-temperature pump 32 provides power to overcome system resistance and transport condensate to the natural gas boiler 43 over long distances and across regions.

[0053] Furthermore, such as Figure 1 As shown, in order to realize the waste heat recovery and utilization of the high-temperature steam condensate output from the steam storage tank 41, the outlet of the steam storage tank 41 is connected to the inlet of the condensate recovery device 31 through the secondary conveying pipe 14.

[0054] Furthermore, such as Figure 1 As shown, in order to reduce the high-pressure steam generated by the boiler to a safe and suitable working pressure required by the heat-using unit 2 and ensure system stability, a pressure-reducing valve group 15 electrically connected to the control module 9 is provided on the supply pipe 8.

[0055] Furthermore, such as Figure 1As shown, in order to ensure efficient, safe, and long-distance transportation of high-temperature steam condensate, and to reduce heat loss during transportation, the supply pipe 8, the main delivery pipe 7, and the waste heat recovery pipe 6 are all insulated pressure pipes.

[0056] Furthermore, such as Figure 1 As shown, in order to avoid flash evaporation loss and achieve complete recovery and efficient utilization of high-temperature steam condensate, the condensate recovery device 31 is a closed pressure vessel.

[0057] Furthermore, such as Figure 1 As shown, the intelligent control unit is configured such that when the temperature sensor 11 and the pressure sensor 10 detect that the temperature of the steam is not lower than 90°C and the pressure is not lower than 2.5 kg, the control module 9 controls the electric proportional valve 12 to open and the electric valve 13 to close.

[0058] When the steam temperature is detected to be below 80°C and the pressure is below 2kg, the control module 9 controls the electric proportional valve 12 to close and the electric valve 13 to open.

[0059] In this embodiment, when the steam temperature (T) is detected to be ≥90℃ and pressure (P) is detected to be ≥2.5kg, the control module 9 determines that the residual heat is sufficient and controls the electric proportional valve 12 to open according to the set requirements, while simultaneously closing the electric valve 13, and the heating unit 2 prioritizes the use of free residual heat; when the steam temperature (T) is detected to be <80℃ and pressure (P) is detected to be <2kg, the control module 9 determines that the residual heat is insufficient, and at this time controls the electric proportional valve 12 to close and the electric valve 13 to open, switching to the steam supplied by the steam storage tank 41 and the natural gas boiler 43 for heating, ensuring uninterrupted production.

[0060] Furthermore, such as Figure 1 As shown, in order to prevent steam from flowing back and impacting the valve body or other precision components, and to improve operational reliability, check valves 16 are respectively installed on the main delivery pipe 7 and the supply pipe 8 at the end near the heat-using unit 2.

[0061] Furthermore, such as Figure 1 As shown, a water pump 17 is installed on the pipeline connecting the natural gas boiler 43 and the return water tank 5.

[0062] In this embodiment, the recovered condensate is pressurized and forcibly transported to the natural gas boiler 43 to maintain the normal water level of the boiler and ensure that it continuously and stably generates steam.

[0063] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model patent.

Claims

1. A steam condensate waste heat recovery and utilization system based on multi-device collaboration, characterized in that, It includes a heat source unit, a heat consumption unit, a waste heat recovery unit, a steam buffer and replenishment unit, and an intelligent control unit; The steam buffer and replenishment unit includes a steam storage tank, a steam distribution cylinder, and a natural gas boiler; The heat source unit includes a paperboard line and / or a flexographic printing machine for generating high-temperature steam condensate; The heat-using unit includes a coating machine and a dehumidifier that require heat sources; The waste heat recovery unit includes a condensate recovery device and a high-temperature pump; The steam outlet of the natural gas boiler is connected to the heat source unit and the steam storage tank respectively through the steam distribution cylinder, and the water inlet is connected to the condensate recovery device and the water outlet of the heat-using unit through the return water tank. The inlet of the condensate recovery device is connected to the condensate outlet of the heat source unit through a waste heat recovery pipe, and its steam outlet is connected to the steam inlet of the heat-using unit through a main conveying pipe. A high-temperature pump is installed on its outlet. The steam outlet of the steam storage tank is connected to the steam inlet of the heat-using unit via a supply pipe. The intelligent control unit includes a control module, as well as a pressure sensor, a temperature sensor, an electric proportional valve, and an electric valve that are connected to the control module via signals. The pressure sensor, temperature sensor, and electric proportional valve are respectively installed on the main delivery pipe; The electric valve is installed on the supply pipe.

2. The steam condensate waste heat recovery and utilization system based on multi-device collaboration according to claim 1, characterized in that, The outlet of the steam storage tank is connected to the inlet of the condensate recovery device via a secondary conveying pipe.

3. The steam condensate waste heat recovery and utilization system based on multi-device collaboration according to claim 1, characterized in that, The supply pipe is equipped with a pressure reducing valve assembly that is electrically connected to the control module.

4. A steam condensate waste heat recovery and utilization system based on multi-device collaboration according to claim 1, characterized in that, The supply pipe, main delivery pipe, and waste heat recovery pipe are all insulated pressure pipes.

5. A steam condensate waste heat recovery and utilization system based on multi-device collaboration according to claim 1, characterized in that, The condensate recovery device is a closed pressure vessel.

6. A steam condensate waste heat recovery and utilization system based on multi-device collaboration according to claim 1, characterized in that, The intelligent control unit is configured as follows: When the temperature sensor and pressure sensor detect that the steam temperature is not lower than 90°C and the pressure is not lower than 2.5 kg, the control module controls the electric proportional valve to open and the electric valve to close. When the steam temperature is detected to be below 80°C and the pressure is below 2kg, the control module controls the electric proportional valve to close and the electric valve to open.

7. A steam condensate waste heat recovery and utilization system based on multi-device collaboration according to claim 1, characterized in that, Check valves are respectively installed on the main delivery pipeline and the supply pipeline at the end near the heat-using unit.

8. A steam condensate waste heat recovery and utilization system based on multi-device collaboration according to claim 1, characterized in that, A water pump is installed on the pipeline connecting the natural gas boiler and the return water tank.

Images