阅读说明：本技术 一种热水锅炉烟气余热回收系统 (A kind of hot-water boiler flue gas waste heat recovery system ) 是由 闵鑫沛 闵含金 于 2019-08-28 设计创作，主要内容包括：本发明提供一种热水锅炉烟气余热回收系统,属于烟气回收设备领域,包括热水锅炉、以及分别与所述热水锅炉连通的供水管路和回水管路,其特征在于,所述热水锅炉的烟道出口上连通有用于换热的节能器；所述回水管路的输出端连通并联的第一分管路和第二分管路,所述第一分管路与所述节能器连通以使烟气余热对回暖水加热,所述第二分管路与所述热水锅炉连通以对回暖水直接加热。本发明在热水锅炉的烟道出口上设置节能器,将部分回暖水分流至节能器中与烟气余热进行换热,即采用回暖水分流加热的方式,可以高效地提升烟气余热回收率,从而降低了热水锅炉的能耗,另外本发明仅通过设置节能器来对烟气余热进行回收利用,结构简单且成本较低。(The present invention provides a kind of hot-water boiler flue gas waste heat recovery system, belong to off-gas recovery apparatus field, the water supply pipe and water return pipeline being connected to including hot-water boiler and respectively with the hot-water boiler, which is characterized in that the energy-saving appliance for heat exchange is communicated on the flue outlet of the hot-water boiler；The output end connection of the water return pipeline the first branch pipeline and the second branch pipeline in parallel, first branch pipeline is connected to the energy-saving appliance so that fume afterheat heats improvements water, and second branch pipeline is connected to directly heat to improvements water with the hot-water boiler.Energy-saving appliance is arranged on the flue outlet of hot-water boiler in the present invention, part improvements moisture is flow in energy-saving appliance and is exchanged heat with fume afterheat, i.e. by the way of the heating of improvements moisture stream, flue gas waste heat recovery rate can efficiently be promoted, to reduce the energy consumption of hot-water boiler, in addition the present invention is only recycled fume afterheat by setting energy-saving appliance, and structure is simple and cost is relatively low.)

1. a kind of hot-water boiler flue gas waste heat recovery system, it is connected to including hot-water boiler and respectively with the hot-water boiler Water supply pipe and water return pipeline, which is characterized in that the energy-saving appliance for heat exchange is communicated on the flue outlet of the hot-water boiler；

The output end of the water return pipeline is communicated with the first branch pipeline and the second branch pipeline in parallel, first branch pipeline and institute It states energy-saving appliance to be connected to so that fume afterheat heats improvements water, second branch pipeline is connected to the hot-water boiler to improvements Water directly heats.

2. hot-water boiler flue gas waste heat recovery system according to claim 1, which is characterized in that be equipped in the energy-saving appliance Heat exchange coil, first branch pipeline is connected to the heat exchange coil so that fume afterheat carries out indirect heating to improvements water.

3. hot-water boiler flue gas waste heat recovery system according to claim 1, which is characterized in that in first branch pipeline It is disposed with pressure reducing valve and the first ratio adjusting valve, the first bypass gate valve is also parallel on first ratio adjusting valve.

4. hot-water boiler flue gas waste heat recovery system according to claim 1, which is characterized in that in second branch pipeline It is disposed with the second ratio adjusting valve and check-valves, is also parallel with the second bypass on second ratio adjusting valve and check-valves Gate valve.

5. hot-water boiler flue gas waste heat recovery system according to claim 4, which is characterized in that second branch pipeline with The water return outlet of hot-water boiler is connected to.

6. hot-water boiler flue gas waste heat recovery system according to claim 1, which is characterized in that it further include circulation mechanism, The circulation mechanism is water circulating pump of the connection on the water supply pipe.

7. hot-water boiler flue gas waste heat recovery system according to claim 6, which is characterized in that on the hot-water boiler also It is communicated with water replanishing device.

8. hot-water boiler flue gas waste heat recovery system according to claim 7, which is characterized in that the water replanishing device includes Expansion tank, the expansion tank are connected to external water pipe, are additionally provided with water-level gauge and overflow pipe on the expansion tank.

9. hot-water boiler flue gas waste heat recovery system according to claim 1, which is characterized in that it further include circulation mechanism, The circulation mechanism is water circulating pump of the connection on the water return pipeline, and along improvements water flowing direction, the water circulating pump is set It sets at the rear of the first branch pipeline and the second branch pipeline.

10. hot-water boiler flue gas waste heat recovery system according to claim 9, which is characterized in that the water return pipeline Input terminal is also parallel with constant pressure supply water pipeline.

Technical field

The invention belongs to off-gas recovery apparatus fields, and in particular to a kind of hot-water boiler flue gas waste heat recovery system.

Background technique

What heating system generally used at present is all hot water circuit heating system, i.e., is heated using hot-water boiler to water, so Afterwards by delivery to resident family radiator or floor heating in room air carry out heat exchange, carry out heat exchange after return water Heat cycles are returned again into hot-water boiler by circulating pump to utilize.But traditional heating system does not generate hot-water boiler Flue gas be recycled, cause a large amount of waste heats to waste, the energy consumption of boiler increases, and further increases economic cost.

In order to solve the above-mentioned technical problem, the prior art (CN109668133A) is provided more than a kind of Heating Hot Water Boiler flue gas Heat recovery system and its recovery method, including sequentially connected Heating Hot Water Boiler, economizer, desulfurizing tower, flue gas condenser, cigarette Chimney, flash tank and absorption heat pump.The prior art absorbs smoke heat energy using economizer, and is absorption by flash evaporation technology Heat pump provides driving steam, and heating water return completely or partially enters after absorption heat pump heats to enter back into Heating Hot Water Boiler and add Heat, i.e. the prior art recycle fume afterheat, improve energy utilization rate.But the prior art is using province's coal The system that device, flue gas condenser, flash tank and absorption heat pump combine recycles fume afterheat, structure is complicated and Higher cost.

Summary of the invention

Problem based on the above background, the present invention is intended to provide a kind of hot-water boiler flue gas waste heat recovery system, using energy conservation Part improvements moisture flow in energy-saving appliance and exchanges heat with fume afterheat by device, and structure is simple.

In order to achieve the above objectives, present invention provide the technical scheme that

A kind of hot-water boiler flue gas waste heat recovery system, including hot-water boiler and be connected to respectively with the hot-water boiler Water supply pipe and water return pipeline, which is characterized in that the energy conservation for heat exchange is communicated on the flue outlet of the hot-water boiler Device；The output end of the water return pipeline is communicated with the first branch pipeline and the second branch pipeline in parallel, first branch pipeline and institute It states energy-saving appliance to be connected to so that fume afterheat heats improvements water, second branch pipeline is connected to the hot-water boiler to improvements Water directly heats.

Wherein, heat exchange coil is equipped in the energy-saving appliance, first branch pipeline is connected to so that cigarette with the heat exchange coil Gas waste heat carries out indirect heating to improvements water.

In one embodiment, it is disposed with pressure reducing valve and the first ratio adjusting valve in first branch pipeline, it is described The first bypass gate valve is also parallel on first ratio adjusting valve.

In one embodiment, it is disposed with the second ratio adjusting valve and check-valves in second branch pipeline, it is described The second bypass gate valve is also parallel on second ratio adjusting valve and check-valves.

Preferably, second branch pipeline is connected to the water return outlet of hot-water boiler.

In one embodiment, the hot-water boiler flue gas waste heat recovery system further includes circulation mechanism, the circulator Structure is water circulating pump of the connection on the water supply pipe.

Preferably, water replanishing device is also communicated on the hot-water boiler.

It is highly preferred that the water replanishing device includes expansion tank, the expansion tank is connected to external water pipe, described Water-level gauge and overflow pipe are additionally provided on expansion tank.

In one embodiment, the hot-water boiler flue gas waste heat recovery system further includes circulation mechanism, the circulator Structure is water circulating pump of the connection on the water return pipeline, and along improvements water flowing direction, the water circulating pump is arranged at first point The rear of pipeline and the second branch pipeline.

Preferably, the input terminal of the water return pipeline is also parallel with constant pressure supply water pipeline.

Compared with prior art, the present invention has the effect that

1, the present invention energy-saving appliance is set on the flue outlet of hot-water boiler, by part improvements moisture flow in energy-saving appliance with Fume afterheat exchanges heat, i.e., is only recycled by setting energy-saving appliance to fume afterheat, structure is simple and cost compared with It is low.

2, the present invention can efficiently promote flue gas waste heat recovery rate, to drop by the way of the heating of improvements moisture stream The low energy consumption of hot-water boiler.

Detailed description of the invention

To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described.

Fig. 1 is the structural schematic diagram of normal-pressure hot-water boiler flue gas waste heat recovery system in the embodiment of the present invention 1；

Fig. 2 is the structural schematic diagram of the first branch pipeline in Fig. 1；

Fig. 3 is the structural schematic diagram of water replanishing device in Fig. 1；

Fig. 4 is bearing hot water residual heat from boiler fume recovery system in the embodiment of the present invention 2.

Specific embodiment

In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that term " first ", " second ", " third ", " the 4th " are only for side Just mesh is described, cannot be understood as indicating or implying relative importance.

Hot-water boiler flue gas waste heat recovery system of the invention be suitable for normal-pressure hot-water boiler, bearing hot water boiler and Next the recycling of fume afterheat in organic heat carrier hot-water boiler will pass through specific embodiment to fume afterheat system of the invention System is described in detail.