CN103438472B - The waste heat recovering energy conserving device being adapted to boiler chimney and the chimney comprising this device - Google Patents

Abstract

The object of the present invention is to provide a waste heat recovery energy-saving device adapted to boiler chimneys and a chimney containing the device. The waste heat recovery energy-saving device adapted to boiler chimneys includes an upper conducting ring, a lower conducting ring, an upper conducting ring and a lower conducting ring. Heat exchange tubes are installed between the rings, the upper conduction ring and the lower conduction ring are both hollow structures, and are connected to the heat exchange tubes, the upper conduction ring is fixed at the upper position inside the chimney through the upper connection plate, and the lower conduction ring is connected to the chimney. The ring is fixed at the lower position inside the chimney through the lower connecting plate, and the water inlet and water outlet are respectively set on the upper guide ring; the chimney including the waste heat recovery energy-saving device adapted to the boiler chimney has a circular cross-section of the inner wall of the chimney, and the upper guide ring The diameter of the inner wall of the chimney at the through ring is greater than the diameter of the inner wall of the chimney at other positions, and the upper end of the guide rail is located at the upper conducting ring. The invention can increase the temperature difference during heat exchange and increase the temperature rise rate of the water in the heat exchange tube.

Description

Waste heat recovery and energy-saving device adapted to boiler chimney and chimney including the device

technical field

The invention relates to a waste heat recovery energy-saving device and a chimney comprising the energy-saving device.

Background technique

Energy is an important material basis for human survival and development. With economic development and further expansion of economic scale, energy demand will grow at a relatively rapid rate. Energy is a prominent bottleneck restricting economic and social development at present and for a long period of time in the future. In order to alleviate the constraints of energy bottlenecks, it is necessary to increase supply, but energy resources are limited, and increasing supply will be restricted by various conditions. The fundamental method is Adhere to the policy of developing and saving simultaneously, giving priority to energy saving, vigorously promote the policy of energy saving and consumption reduction, and improve energy utilization efficiency.

The existing boiler flue gas waste heat recovery device is usually installed at the boiler flue outlet, without dust cleaning function, some equipment needs additional power source and related equipment, which will make the initial investment of the equipment relatively large, and cannot achieve good performance. energy saving effect. On the one hand, when the flue gas flowing through the waste heat recovery device of the boiler encounters the low-temperature heat exchange tube, condensed water will be generated on the surface of the heat exchange tube, and the condensed water will easily flow into the boiler. The surface of the boiler and the boiler are highly corrosive, which will reduce the service life of the heat exchange tube and the boiler; Over time, the dust adsorbed on the heat exchange tubes will gradually thicken, greatly reducing the heat transfer efficiency of the heat exchange tubes and affecting the recovery efficiency of the heat exchange tubes for waste heat in the chimney. In addition, the existing boiler flue gas waste heat recovery device welds multiple heat exchange tubes into a box, which is inconvenient for inspection and maintenance, resulting in high maintenance costs during later use.

Contents of the invention

The object of the present invention is to provide a waste heat recovery energy-saving device suitable for boiler chimneys and a chimney containing the device, which can realize efficient recovery and utilization of residual heat in the chimney and can automatically clean the dust on the outer wall of the heat exchange tube in time.

The purpose of the present invention is achieved like this:

The present invention is applicable to the waste heat recovery and energy-saving device of boiler chimney, and is characterized in that it comprises an upper conduction ring and a lower conduction ring, a heat exchange tube is installed between the upper conduction ring and the lower conduction ring, and the upper conduction ring and the lower conduction ring The through rings are all hollow structures and are connected with the heat exchange tubes. The upper conducting ring is fixed at the upper position inside the chimney through the upper connecting plate, and the lower conducting ring is fixed at the lower position inside the chimney through the lower connecting plate. Water inlet and water outlet are respectively set on the through ring;

A sealing disc is arranged between the upper conducting ring and the lower conducting ring, and an annular brush is installed on the sealing disc, the heat exchange tube passes through the annular brush on the sealing disc, and a slider is installed on the edge of the sealing disc, and the slider matches the guide rail, The guide rail is fixed on the inner wall of the chimney, and the sealing disc moves on the guide rail through the slider so that it can move up and down in the chimney.

The waste heat recovery energy-saving device adapted to the boiler chimney of the present invention may also include:

1. A guide rod is set between the upper guide ring and the lower guide ring. The guide rod passes through the center of the sealing disc. The seal disc cooperates with the guide rod through the guide sleeve. The sliders include three, and the three sliders are uniform Distributed on the circumference of the sealing disc, the three sliders are respectively matched with the three guide rails fixed on the inner wall of the chimney.

2. The gap between the ring brush and the heat exchange tube is d, 0﹤d≤5cm.

3. The ring-shaped brush includes an upper semicircle of the brush and a lower semicircle of the brush. The upper semicircle of the brush and the lower semicircle of the brush are all annular structures. The lower end of the upper semicircle of the brush is provided with an annular groove, and the lower half of the brush is installed on the In the annular groove of the upper semicircle, the upper semicircle of the hair brush and the lower semicircle of the hair brush are fixed on the sealing plate by screws, and felt is installed on the inner wall of the upper semicircle of the hair brush.

The invention includes a chimney of a waste heat recovery and energy-saving device suitable for a boiler chimney, and is characterized in that: a sealing plate is arranged between the upper conducting ring and the lower conducting ring, an annular brush is installed on the sealing plate, and the heat exchange tube passes through the sealing plate The ring brush is equipped with a slider on the edge of the sealing disc. The slider is matched with the guide rail, and the guide rail is fixed on the inner wall of the chimney. The sealing disc can move up and down in the chimney by moving on the guide rail through the slider; the cross section of the inner wall of the chimney is circular. , the diameter of the inner wall of the chimney at the upper conducting ring is larger than that at other parts, and the upper end of the guide rail is located at the upper conducting ring.

The chimney of the present invention comprising a waste heat recovery and energy-saving device adapted to a boiler chimney may also include:

1. Except for the upper conduction ring, the distance between the rest of the inner wall of the chimney and the sealing plate is L, 0﹤L≤5cm.

2. An inspection port is provided on the outer wall of the chimney at the position of the waste heat recovery energy-saving device, and a drain port is provided at the lower end of the chimney.

The advantage of the present invention is that it uses an automatic cleaning device to clean the dust adsorbed on the surface of the heat exchange tube and the acidic condensed water condensed on the surface of the heat exchange tube in time, so that the heat transfer efficiency of the heat exchange tube is improved, and not only the high efficiency of the waste gas is realized It also avoids the corrosion of acid condensed water on heat exchange tubes and boilers, which greatly improves the service life of heat exchange tubes in waste heat recovery devices; when installing heat exchange tubes, it is detachable, and the cleaning brush is installed on the On the sealing plate, when the heat exchange tube or brush is damaged, it can be easily replaced by using a wrench through the inspection port on the chimney, without dismantling all the equipment. The replacement process is simple, easy to operate, and saves time; the curved design of the chimney is also It can prevent the condensed water from flowing back into the boiler, causing damage to the equipment and improving the service life of the equipment. This device can seal the flue gas under the sealing plate for a period of time, which can increase the temperature difference during heat exchange and increase the temperature rise rate of the water in the heat exchange tube; this device uses the energy carried by the flue gas itself to make the cleaning device reciprocate up and down, reducing the The number of equipment does not require external power, which not only reduces the initial investment of the equipment but also saves energy during use, and can achieve the purpose of energy saving.

Description of drawings

Fig. 1 is the structural representation of the waste heat recovery energy-saving device that the present invention is adapted to boiler chimney;

Fig. 2 is a structural diagram of the sealing disc of the present invention;

Fig. 3 is a schematic diagram of the installation of the brush of the present invention;

Fig. 4 is a schematic diagram of installation of a chimney of the present invention including a waste heat recovery and energy-saving device adapted to a boiler chimney.

detailed description

The present invention is described in more detail below in conjunction with accompanying drawing example:

Combined with Figures 1 to 4, the energy-saving part is the core part of the device, mainly composed of boiler 23, gas outlet 27, chimney 1, inspection port 26, heat exchange tube 13, inner wire pipe joint 14, lower guide ring 2, upper guide Through ring 5, water inlet 8, water outlet 9, connecting plate 6, connecting plate 28, expansion screw 29, and fan 22; in this device, the chimney is located obliquely above the boiler and connected to the boiler through the smoke outlet, an energy-saving device Use connecting plate 6 and expansion screw 29 to be installed in the chimney near the chimney 1 and the connection of air outlet 27, and design an inspection port 26 at the position where the energy-saving device is installed on the chimney. A blower fan 22 is installed at the air inlet of the boiler, which can not only enable the fuel to be fully burned in the boiler but also increase the pressure of the gas at the air outlet to provide greater power for the movement of the sealing disc 12 . When installing the energy-saving device, insert a plurality of heat exchange tubes 13 into the annular brush 17 on the sealing plate 12. In the horizontal direction, the heat exchange tubes 13 are arranged in a ring shape, which is conducive to the circulation of flue gas and the recovery of heat. The upper ends of a plurality of parallel heat exchange tubes 13 are connected to the upper conduction ring 5 using inner wire pipe joints 14, the lower ends of the heat exchange tubes are connected to the lower conduction ring 2 using inner wire pipe joints 14, and the upper and lower conduction rings are connected using Expansion screw and connecting plate 6 are installed on the inner wall of chimney 1, when installing heat exchange tube 13, not only will guarantee the parallel of heat exchange tube 13 but also guarantee the parallel of whole device and chimney 1 center line.

The working principle of the energy saving part:

The burned waste gas enters the chimney 1 through the gas outlet 27 on the upper part of the boiler 23 to provide heat for the energy-saving device. A plurality of parallel heat exchange tubes 13 are arranged in the vertical direction in the chimney 1, and all the heat exchange tubes 13 are connected into an internally connected pipeline through the upper conducting ring 5 and the lower conducting ring 2, and the cold water flows from the water inlet 8 It flows into the energy-saving device from the outside, and when it flows through the heat exchange pipe 13, it exchanges heat with the flue gas, uses the residual heat of the flue gas to heat the cold water, and the cold water flows out from the water outlet 9 after being heated to a standard temperature. When the energy-saving device is working, the flue gas flowing through the waste heat recovery device of the boiler will continuously generate condensed water on the surface of the heat exchange tube after cooling down, and as the condensed water increases, it will gradually gather in the groove at the lower end of the chimney, and It is discharged into the sewage pool outside the equipment by the outlet 24 for treatment. When the equipment fails or needs to replace the brush 17 and the heat exchange tube 13, it can be maintained through the inspection port 26.

Combined with Figures 1, 2, 3 and 4, the cleaning part is mainly composed of guide rod 3, flange 7, flange 15, guide sleeve 4, guide rail 10, slider 11, sealing disc 12, brush 17, felt 19, brush Upper semicircle 20, brush lower semicircle 21, screw 18, drain outlet 24 form. The key component of this device is the sealing disc 12, which is not only used for gas sealing but also for fixing the brush 17. In order to ensure the pressure on the lower surface of the sealing disc 12, the sealing disc 12 must ensure that the sealing disc 12 is The gap between the hole on the top and the heat exchange tube 13 is less than 5mm, and the gap between the outer circle of the sealing disc 12 and the inner wall of the chimney 1 is less than 5mm. There are multiple round holes on the sealing disc 12 for installing the brush 17 and the heat exchange tube 13. pass. There are three parallel sliding guide rails evenly distributed on the circumference of the sealing disc 12, the slider 11 is installed on the rib 16 of the sealing disc 12, the guide rail 10 is installed on the inner wall of the chimney 1, and three guide rails must be ensured when installing the guide rail 10 parallel. In order to make the sealing disc 12 move in parallel, a guide device is used in the center of the sealing disc 12. The upper end of the guide rod 3 is installed on the upper guide ring 5 using the flange 7, and the lower end of the guide rod is installed on the lower guide ring 2 using the flange 15. Above, in order to meet the design requirements and ensure that the high-pressure gas sealed under the sealing plate 12 can be discharged when the sealing plate 12 moves to the upper end, the inner diameter of the chimney 1 is larger than that of the lower end of the chimney 1 at the upper position of the energy-saving device.

The cleaning part mainly uses the brush 17 to clean the surface of the heat exchange tube, the brush 17 is fixed on the sealing plate 12 by the screw 18, and the felt 19 is installed on the brush 17 . The hairbrush 17 belongs to consumables and is easy to wear and tear during use, so the hairbrush 17 is designed as two semicircular structures for easy disassembly. It is fixed on the seal plate 12 together with the lower semicircle 21 of the brush through screws 18. When a certain brush 17 is worn out, unscrew the screw 18 through the inspection port 26 and replace it individually instead of all of them, which not only saves It reduces the cost and makes disassembly easier.

How the cleaning part works:

The movement of the cleaning part is realized by using the pressure energy of the gas and its own gravity. In order to make the sealing disc 12 reciprocate up and down smoothly, a guide device is used in the center of the disc to guide it, and three parallel sliding guide rails are evenly installed on the circumference of the sealing disc to cooperate with the guide device to realize the directional reciprocating movement of the sealing disc 12 . During work, under the effect of blower fan 22, air flows through boiler 23, and enters the inside of chimney 1 by air outlet 27, along with flue gas constantly enters in chimney 1 and the continuous raising of flue gas temperature in chimney 1, The pressure of the gas in the lower part of the sealing disc 12 gradually increases, and a certain pressure difference is generated on the upper and lower sides of the sealing disc 12, and the sealing disc 12 is lifted under the action of atmospheric pressure; After the sealing disc 12 rises to this position, the high-pressure flue gas sealed by the sealing disc 12 is discharged, and the pressure difference between the upper and lower sides disappears, and the sealing disc 12 falls to the bottom under the action of its own gravity, thereby realizing the up and down movement of the sealing disc. Driven by the sealing disc, the brush 17 realizes the cleaning of the heat exchange tube group.

Claims (8)

1. be adapted to the waste heat recovering energy conserving device of boiler chimney, it is characterized in that: include conducting ring, under lead Logical ring, installs heat-exchange tube between upper conducting ring and lower conducting ring, upper conducting ring and lower conducting ring are hollow Structure, and be all connected with heat-exchange tube, upper conducting ring is fixed on the top within chimney by upper junction plate Position, lower conducting ring is fixed on the lower position within chimney by lower connecting plate, upper conducting ring sets respectively Put water inlet and outlet；

Between upper conducting ring and lower conducting ring, seal disc is set, seal disc is installed annular brush, heat-exchange tube Through the annular brush on seal disc, slide block is installed at seal disc edge, and slide block matches with guide rail, and guide rail is solid Being scheduled on inner wall of stack, seal disc is moved on guide rail by slide block thus can move up and down in chimney.

The waste heat recovering energy conserving device being adapted to boiler chimney the most according to claim 1, is characterized in that: Arranging guide post between upper conducting ring and lower conducting ring, guide post is through the center of seal disc, and seal disc passes through Fairlead coordinates with guide post, and described slide block includes three, and three slide blocks are evenly distributed on the circle of seal disc Zhou Shang, three slide blocks match with three guide rails being fixed on inner wall of stack respectively.

The waste heat recovering energy conserving device being adapted to boiler chimney the most according to claim 1 and 2, it is special Levy and be: the gap between annular brush and heat-exchange tube is d, 0 d≤5cm.

The waste heat recovering energy conserving device being adapted to boiler chimney the most according to claim 1 and 2, it is special Levy and be: described annular brush includes hairbrush upper semi-circle, hairbrush lower half circle, hairbrush upper semi-circle, hairbrush lower half Circle is loop configuration, and hairbrush upper semi-circle lower end arranges cannelure, and hairbrush lower half circle is arranged on hairbrush upper semi-circle Cannelure in, hairbrush upper semi-circle, hairbrush lower half circle are fixed by screws on seal disc, hairbrush upper semi-circle Inwall installs felt.

The waste heat recovering energy conserving device being adapted to boiler chimney the most according to claim 3, is characterized in that: Described annular brush includes that hairbrush upper semi-circle, hairbrush lower half circle, hairbrush upper semi-circle, hairbrush lower half circle are ring Shape structure, hairbrush upper semi-circle lower end arranges cannelure, and hairbrush lower half circle is arranged on the cannelure of hairbrush upper semi-circle In, hairbrush upper semi-circle, hairbrush lower half circle are fixed by screws on seal disc, and hairbrush upper semi-circle inwall is installed Felt.

6. the cigarette of the waste heat recovering energy conserving device being adapted to boiler chimney comprised described in claim 1 Chimney, is characterized in that: above arrange seal disc between conducting ring and lower conducting ring, and seal disc is installed annular brush, Heat-exchange tube installs slide block through the annular brush on seal disc, seal disc edge, and slide block matches with guide rail, Guide rail is fixed on inner wall of stack, seal disc by slide block move on guide rail thus can in chimney on move down Dynamic；The cross section of inner wall of stack is circular, and the inner wall of stack diameter at upper conducting ring is more than the chimney at other position Inner diameter, the upper-end part of driving of guide rail is at upper conducting ring.

The cigarette comprising the waste heat recovering energy conserving device being adapted to boiler chimney the most according to claim 6 Chimney, is characterized in that: in addition at upper conducting ring, and remaining position of inner wall of stack is L with the distance of seal disc, 0 L≤5cm.

8. according to the waste heat recovering energy conserving device being adapted to boiler chimney comprising described in claim 6 or 7 Chimney, is characterized in that: the position being positioned at waste heat recovering energy conserving device on chimney outer wall offers access hole, Discharge outlet is offered in chimney bottom.