CN201901806U - Closed type waste heat recovery system of corrugated paperboard production line - Google Patents

Abstract

The utility model discloses a closed waste heat recovery system of a corrugated cardboard production line. The corrugated cardboard production line includes a single-facer unit, a preheating cylinder, a triple preheater and a drying plate, and is used to supply the single-facer unit, preheat Cylinder, triple preheating device and drying plate heating boiler, between the outlet of the heating pipeline of the single-sided unit, preheating cylinder, triple preheating device and drying plate and the water inlet of the boiler There is a water collecting tank for collecting the effluent of the heating pipeline, a steam recovery machine for receiving and pressurizing the effluent of the water collecting tank, and a balance tank for collecting the effluent of the steam recovery machine. The utility model corrugated cardboard production line waste heat closed recovery system pressurizes the condensed water and waste steam produced by the production line with the principle of piston cylinder compression, and then directly presses the water vapor mixture into the boiler to form a closed circulation loop. It can reduce the pollution caused by running, escaping, dripping, leaking and waste water discharge of steam and condensed water.

Description

Corrugated cardboard production line waste heat closed recovery system

technical field

The utility model relates to the technical field of energy recovery and utilization, in particular to a closed waste heat recovery system of a corrugated cardboard production line.

Background technique

As the world's energy resources become increasingly tense, enterprises pay more and more attention to the condensed water produced in the production process, in order to save energy, protect the environment and reduce production costs through effective waste heat utilization. At present, the corrugated cardboard production line needs to use heat source for heating equipment, including single-facer unit, preheating cylinder, triple preheating device and drying plate. Row or open recovery system.

The open recovery system recovers the condensed water to the feed water tank of the boiler. During the recovery and utilization of the condensed water, one end of the recovery pipeline is open to the atmosphere, that is, the condensed water collection tank is opened to the atmosphere. When the pressure of the condensed water is low and cannot reach the reuse place by self-pressure, use the pump to send the condensed water under pressure.

Therefore, a large part of the waste heat of the corrugated cardboard production line in the prior art is lost and has not been effectively recycled.

Utility model content

The utility model provides a closed waste heat recovery system of a corrugated cardboard production line with reasonable structure and good heat recovery effect.

A closed waste heat recovery system for a corrugated cardboard production line, the corrugated cardboard production line includes a single-facer unit, a preheating cylinder, a triple preheating device and a drying plate, and is used to supply the single-facer unit, the preheating cylinder, and the triple preheating The heating boiler for the device and the drying plate, between the outlet of the heating pipeline of the single-sided unit, the preheating cylinder, the triple preheating device and the drying plate and the water inlet of the boiler, there are sequentially provided for collecting the water supply A collection tank for hot line effluent, a steam recovery unit to receive and pressurize the discharge from the collection tank, and an equalization tank to collect effluent from the steam recovery unit.

There are two water collecting tanks, wherein the outlets of the heating pipeline of the single-sided unit and the preheating cylinder are respectively connected with the first water collecting tank, and the outlets of the heating pipeline of the triple preheating device and the drying plate are respectively Connect with the second water collecting tank. The first water collecting tank and the second water collecting tank are connected to the steam recovery machine.

As far as the single-sided unit, preheating cylinder, triple preheating device and drying plate itself are concerned, their structures can be existing technologies, and there are no strict restrictions, except that they all have heating pipelines.

The waste heat recovery system of the utility model corrugated cardboard production line is to install a water collection tank, a steam recovery machine and a balance tank at the end of the return pipe of the steam equipment such as the single-sided unit and the drying plate of the production line, and directly pressurize the return steam and return water, so that It reaches a slightly higher pressure than when the boiler is running, and it is directly pressed back to the boiler to form a closed cycle, so that the steam and water are not discharged outside, and the purpose of saving coal and water is achieved. All the pipelines of the system are under positive pressure, most of the heat of condensed water in the system is directly recovered to the boiler, and the temperature is only consumed in the part of the steam-consuming equipment. After the pipeline is insulated, there is little heat dissipation, the water quality is guaranteed, and the economic benefits Well, at the same time, the problem of dissolved oxygen in the return water is avoided, and the safety of the boiler is more secure. It can also realize automatic control by installing pressure controller, water level controller and time relay. It saves labor and electricity, and is an ideal recycling system.

The closed recovery system is that the condensed water collection tank and all pipelines are under constant positive pressure. The system is closed. Most of the energy of the condensed water in the system is directly recovered to the boiler through certain recovery equipment, so as to achieve recovery. The purpose of saving soft water, electricity and coal. The utility model corrugated cardboard production line waste heat closed recovery system pressurizes the condensed water and waste steam produced by the production line with the principle of piston cylinder compression, and then directly presses the water vapor mixture into the boiler to form a closed circulation loop, thereby To achieve the purpose of energy saving. Compared with the direct discharge type, it can save more than 40-50% of coal per month; than the open recovery system, it can save more than 15-20% of coal per month. The time of pressure is increased, that is, the number of times to restart the furnace and heat up is reduced, which is conducive to the constant heat supply of the heating part of the production line, and has a significant effect on improving the quality of corrugated cardboard and increasing the speed of the machine. The closed waste heat recovery of the production line can also reduce the pollution caused by steam and condensed water running, running, dripping, leaking and waste water discharge, which has certain social benefits.

Description of drawings

Fig. 1 is a schematic diagram of the waste heat closed recovery system of the corrugated cardboard production line of the present invention.

Detailed ways

Referring to Fig. 1, the utility model is a closed waste heat recovery system of a corrugated cardboard production line, wherein the equipment required for heat supply in the corrugated cardboard production line includes a single-sided unit, a preheating cylinder, a triple preheating device and a drying Single-sided unit, preheating cylinder, triple preheating device and boiler for heating by drying plate.

A water collection tank, a steam recovery machine and a balance tank are sequentially arranged between the outlet of the heating pipeline of the single-sided unit, the preheating cylinder, the triple preheating device and the drying plate and the water inlet of the boiler.

Among them, the size of the water collection tank: diameter 400mm, height 600mm, wall thickness 8mm. Balance tank size: diameter 400mm, height 800mm, wall thickness 8mm.

The return water pipes of the single-sided unit and the front and rear preheating cylinders of the unit are installed in a set of water collection tanks. Install the drying plate and the return water pipeline of the triple preheating device in another set of water collection tanks to achieve a balanced recovery.

The ideal distance between the single-sided unit, preheating cylinder, triple preheating device and drying plate boiler of steam equipment should be less than 200 meters, and the steam inlet and return pipes are required to be relatively thick. The water inlet from the highest point of the balance tank to the boiler should be There is a certain slope drop, so that the water can flow naturally to the boiler.

The connecting pipe between the water collection tank and the steam recovery machine is close to the middle of the water collection tank, so that the foreign matter in the steam equipment can fall into the bottom of the water collection tank without entering the steam recovery machine. The return pipe should be inserted into the center of the balance tank as much as possible. position to reduce shock vibration.

The steam recovery machine should be installed between the single-sided unit and the triple preheating device, and choose a low-lying location. If necessary, dig a pit, and the bottom of the pit should be 0.5 meters lower than the return pipe of the production line. The size of the pit is: 2500mm*2500mm.

The inlet of the steam recovery machine is equipped with a water collection tank, and the outlet is equipped with a balance tank. The return water pipeline of the production line should have a certain slope to the steam recovery machine, so that water can flow into the water collection tank naturally.

The bottom of the steam recovery machine should be buried with concrete, and the outlet should have fewer turns, with large arc elbows, and the pipes should be firmly fixed. The welding slag in the pipeline must be cleaned up to prevent it from entering the recycling machine.

A bypass valve is installed at the return water outlet of each steam-using equipment, and some condensed water is drained out to shorten the heating time when the machine is started up, and it is closed by the stop valve when not in use, so as to prevent the water in the pipeline from flowing back into the unit.

Claims (3)

1. corrugated paper board production line waste heat enclosed recovery system, described corrugated paper board production line comprises the single face unit, preheating cylinder, three preheating devices and oven dry plate, and be used for to the single face unit, preheating cylinder, the boiler of three preheating devices and the heat supply of oven dry plate, it is characterized in that, at described single face unit, preheating cylinder, be provided with the water collect tank that is used to collect the heat supplying pipeline water outlet successively between the outlet of the heat supplying pipeline of three preheating devices and oven dry plate and the water inlet of boiler, be used to receive and to the Steam Recovery machine of water collect tank effluent supercharging be used to collect the compensator of Steam Recovery machine water outlet.

2. corrugated paper board production line waste heat enclosed recovery system as claimed in claim 1, it is characterized in that, described water collect tank is two, wherein the outlet of the heat supplying pipeline of single face unit, preheating cylinder is communicated with first water collect tank respectively, and the outlet of the heat supplying pipeline of three preheating devices and oven dry plate is communicated with second water collect tank respectively.

3. corrugated paper board production line waste heat enclosed recovery system as claimed in claim 2 is characterized in that, described first water collect tank and second water collect tank also connect into described Steam Recovery machine.

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