CN204611733U - The recycling system of boiler afterheat - Google Patents

Abstract

The utility model relates to technical field of waste heat utilization, provides a kind of recycling system of boiler afterheat, and the recycling system of boiler afterheat comprises flue gas waste heat recovery apparatus and steam condensed water waste heat retracting device.Flue gas waste heat recovery apparatus comprises water supply installation and heat-exchanging water tank, and heat-exchanging water tank is also provided with the first water inlet and the first delivery port, and the first water inlet connects water supply installation, and the first delivery port connects admission port; Water supply installation connects admission port.Steam condensed water waste heat retracting device comprises reclamation of condensate water machine and waste heat grade lifting device, reclamation of condensate water machine is provided with receiving port and outlet, waste heat grade lifting device is provided with the second water inlet and the second delivery port, receiving port receives steam or condensate water, outlet connects the second water inlet, and the second delivery port connects admission port.The efficiency of this system recoveries waste heat is higher, can reach the object of energy-saving and emission-reduction, reduces the energy consumption cost of enterprise, reduces the pollution to environment.

Description

Recovery and Utilization System of Boiler Waste Heat

technical field

The utility model relates to the technical field of waste heat utilization, in particular to a recycling system for boiler waste heat.

Background technique

During the operation of the boiler, in order to avoid the corrosion of equipment by condensed acid and sulfur, the design value of the exhaust gas temperature is usually above 200°C, and the actual temperature of the exhaust gas of some boilers is above 300°C. Pollution is also a kind of heat energy loss, and it also causes high production energy consumption of enterprises, which cannot achieve the purpose of saving energy, reducing consumption and reducing emissions.

Utility model content

The purpose of the utility model is to provide a boiler waste heat recovery and utilization system, which can save energy, reduce consumption and reduce emissions, and reduce the production energy consumption cost of enterprises.

The utility model is achieved in that:

In the first aspect, the embodiment of the utility model provides a boiler waste heat recycling system, the boiler is provided with a water supply port and a high-temperature flue gas outlet, and the boiler waste heat recovery system includes a flue gas waste heat recovery device and a steam condensing Water waste heat recovery device, the flue gas waste heat recovery device includes a water supply device and a water exchange tank, the water exchange tank is provided with a smoke exhaust port and a smoke inlet connected to the high-temperature flue gas outlet, and the water exchange tank is also provided with There are a first water inlet and a first water outlet, the first water inlet is connected to the water supply device, the first water outlet is connected to the water supply port; the water supply device is connected to the water supply port;

The steam condensate waste heat recovery device includes a steam condensate water recovery machine and a waste heat grade raising device, the steam condensate water recovery machine is provided with a receiving port and a discharge port, and the waste heat grade raising device is provided with a second water inlet and a second A water outlet, the receiving port receives steam or condensed water, the discharge port is connected to the second water inlet, and the second water outlet is connected to the water supply port.

In combination with the first aspect, the embodiment of the utility model provides a first possible implementation manner of the first aspect, wherein the water supply device includes a hot water circulation pump, a hot water storage tank, a water supply pool and a feed water pump, and the first The water outlet is sequentially connected to the water supply port through the hot water storage tank and the water supply pump, and the hot water storage tank is connected to the first water inlet of the heat exchange tank through the hot water circulation pump; the water supply pool The water supply port is connected through the feed water pump; the hot water storage tank is also provided with a compensation water inlet for compensating water volume, and the compensation water inlet is connected to the water supply pool.

The hot water circulating pump pumps the water in the hot water storage tank into the heat exchange tank, and the hot water in the heat exchange tank enters the boiler through the hot water storage tank and the feed water pump, and the water supply pool continuously compensates the water source for the hot water storage tank. In this way, the heat recovery in the flue gas discharged from the boiler is realized.

In combination with the first aspect, the embodiment of the present utility model provides a second possible implementation manner of the first aspect, wherein the water supply device includes a hot water circulation pump, a hot water storage tank, a water supply pool, a feed water pump, and an ion exchange. The first water outlet is sequentially connected to the water supply port through the hot water storage tank and the water feed pump, and the hot water storage tank is connected to the first water inlet of the heat exchange tank through the hot water circulation pump; The water supply pool is connected to the water supply port through the feed water pump; the hot water storage tank is also provided with a compensation water inlet for compensating water volume, and the compensation water inlet and the water supply pool are both connected to the ion exchange.

Since the scale may block the hot water storage tank, hot water circulation pump, exchange water tank and the water pipes used, the water level soft water is used in the recovery and utilization system of boiler waste heat. The ion exchange converts ordinary hard water into soft water for use, which improves the service life of the boiler waste heat recovery system and reduces maintenance.

In combination with the first possible implementation manner or the second possible implementation manner of the first aspect, the embodiment of the present utility model provides a third possible implementation manner of the first aspect, wherein the hot water storage tank is provided with a connection The water replenishment solenoid valve of the compensation water inlet, the hot water storage tank is also provided with a water level controller that controls the opening or closing of the water replenishment solenoid valve.

The hot water storage tank provides water for the exchange water tank, so it is necessary to ensure that there is always a certain amount of water in the hot water storage tank. The setting of the replenishment solenoid valve and the water level controller realizes keeping the water in the hot water storage tank at a certain amount, and prevents damage or failure to recycle waste heat due to lack of water in the heat exchange tank.

In combination with the third possible implementation manner of the first aspect, the embodiment of the present utility model provides a fourth possible implementation manner of the first aspect, wherein an elbow type ventilation pipe is arranged on the top of the hot water storage tank.

The arrangement of the elbow type ventilation pipe makes the hot water storage tank communicate with the atmosphere.

In combination with the fourth possible implementation manner of the first aspect, the embodiment of the present utility model provides a fifth possible implementation manner of the first aspect, wherein the waste heat grade raising device is also provided with a flue passage, and the waste heat grade The lifting device is connected between the boiler and the heat exchange water tank through the flue passage, and the feed water pump is also connected to the water supply port through the waste heat level raising device.

In combination with the fifth and sixth possible implementation manners of the first aspect, the embodiment of the present utility model provides a sixth possible implementation manner of the first aspect, wherein a Dust collector and induced draft fan.

The setting of the dust collector reduces the pollution of the dust in the flue gas to the atmosphere.

In combination with the fifth or sixth possible implementation of the first aspect, the embodiment of the present utility model provides a seventh possible implementation of the first aspect, wherein the waste heat level raising device is an economizer.

After long-term practice by the inventor, the effect of the economizer as a waste heat grade raising device is better.

In combination with the fifth or sixth possible implementation manner of the first aspect, the embodiment of the present utility model provides an eighth possible implementation manner of the first aspect, wherein the device for improving the waste heat level is a finned heat pipe group.

After long-term practice by the inventor, the finned heat pipe group has a better effect as a device for improving the waste heat grade.

The embodiment of the utility model provides a recovery and utilization system of boiler waste heat. The recovery and utilization system of boiler waste heat includes a flue gas waste heat recovery device and a steam condensate water waste heat recovery device. The flue gas waste heat recovery device is equipped with a heat exchange tank and a water supply device. The water supply device supplies water to the heat exchange tank. The water in the heat exchange tank exchanges heat with the flue gas discharged from the boiler, and the hot water after heat exchange is added to the boiler to realize the recovery of waste heat from the boiler flue gas. The steam condensate waste heat recovery device is equipped with a steam condensate water recovery machine and a waste heat grade raising device. The steam condensate water recovery machine receives steam and condensed water, and the waste heat grade raising device raises the grade of steam or condensate water, which is beneficial to utilization. The system has high recovery efficiency of waste heat, which can achieve the purpose of energy saving and emission reduction, reduce the energy consumption cost of the enterprise, and reduce the pollution to the environment.

In order to make the above-mentioned purpose, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below, together with the accompanying drawings, and are described in detail as follows.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 shows the structure of a boiler waste heat recycling system provided by an embodiment of the present invention;

Fig. 2 shows the structure of another boiler waste heat recycling system provided by the embodiment of the present invention;

Fig. 3 shows the structure of another boiler waste heat recycling system provided with an ion exchanger provided by the embodiment of the present invention;

Fig. 4 shows the structure of another boiler waste heat recycling system provided with a steam condensate waste heat recovery device provided by an embodiment of the present invention.

Marks in the figure: boiler 101, high-temperature flue gas outlet 102, water supply port 103, water supply device 104, heat exchange tank 105, smoke inlet 106, smoke exhaust port 107, first water inlet 108, first water outlet 109, hot water Circulation pump 110, hot water storage tank 111, water supply pool 112, feed water pump 113, compensation water inlet 114, replenishment solenoid valve 115, water level controller 116, ion exchange 117, steam condensate recovery machine 118, waste heat grade raising device 119, A second water inlet 120 , a second water outlet 121 , a receiving port 122 , a discharge port 123 , a dust collector 124 , and an induced draft fan 125 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

The exhaust gas temperature of the boiler is generally above 200°C, and 7% to 25% of the sensible heat and 15% of the latent heat in the flue gas are directly discharged into the atmosphere without being utilized. This not only causes a lot of energy waste but also aggravates the thermal pollution of the environment. Therefore, the recovery of waste heat from boiler flue gas can not only improve the utilization rate of heat energy, reduce heat energy consumption, but also reduce the pollution to the environment.

Referring to Fig. 1 , a boiler waste heat recovery system, a boiler 101 is provided with a water supply port 103 and a high-temperature flue gas outlet 102, the boiler waste heat recovery system includes a flue gas waste heat recovery device, and the flue gas waste heat recovery device includes a water supply device 104 and The heat exchange tank 105 is provided with a smoke exhaust port 107 and a smoke inlet 106 connected to the high-temperature flue gas outlet 102. The heat exchange tank 105 is also provided with a first water inlet 108 and a first water outlet 109. The water outlet 108 is connected to the water supply device 104 , the first water outlet 109 is connected to the water supply port 103 ; the water supply device 104 is connected to the water supply port 103 .

The recovery and utilization system of boiler waste heat also includes a steam condensate waste heat recovery device, which includes a steam condensate recovery machine 118 and a waste heat grade raising device 119, and the steam condensate recovery machine 118 is provided with a receiving port 122 and a discharge port 123 The waste heat grade raising device 119 is provided with a second water inlet 120 and a second water outlet 121 , the receiving port 122 receives steam or condensed water, the discharge port 123 is connected to the second water inlet 120 , and the second water outlet 121 is connected to the water supply port 103 .

When using the boiler waste heat recycling system, the water supply device 104 supplies water to the heat exchange tank 105, the water in the heat exchange tank 105 exchanges heat with the flue gas discharged from the high-temperature flue gas outlet 102, and the hot water after heat exchange passes through the water supply port 103 enters the boiler 101 to realize the recovery of waste heat of flue gas. The water supply device 104 also supplies water to the boiler 101 through the water supply port 103 . The temperature of the flue gas discharged from the flue gas outlet 107 can be as low as below 100° C., so the waste heat recovery and utilization system of the boiler has a high efficiency of recovering the waste heat of the flue gas.

In order to improve the efficiency of waste heat recovery, the embodiment of the utility model provides another recovery and utilization system of boiler waste heat. Referring to Fig. 2, the boiler 101 is provided with a water supply port 103 and a high-temperature flue gas outlet 102, the boiler waste heat recovery system includes a flue gas waste heat recovery device, and the flue gas waste heat recovery device includes a water supply device 104 and a heat exchange tank 105, the heat exchange tank 105 A smoke outlet 107 and a smoke inlet 106 connected to the high-temperature flue gas outlet 102 are provided. The water exchange tank 105 is also provided with a first water inlet 108 and a first water outlet 109. The water supply device 104 includes a hot water circulation pump 110, heat storage The water tank 111 , the water supply pool 112 , and the water supply pump 113 , and the first water outlet 109 are connected to the water supply opening 103 through the hot water storage tank 111 and the water supply pump 113 in sequence. The hot water storage tank 111 is connected to the first water inlet 108 of the heat exchange tank 105 through a hot water circulation pump 110 . The top of the hot water storage tank 111 is provided with an elbow-type ventilation pipe, and the hot water storage tank 111 is also provided with a compensation water inlet 114 for compensating the amount of water, a replenishment solenoid valve 115 connected to the compensation water inlet 114, and a water replenishment solenoid valve 115 for controlling opening or closing. With the water level controller 116 closed, the water supply pool 112 is connected to the compensation water inlet 114 through the replenishment solenoid valve 115 . The water supply pool 112 is also connected to the water supply port 103 through a water supply pump 113 .

The recovery and utilization system of boiler waste heat also includes a steam condensate waste heat recovery device, which includes a steam condensate recovery machine 118 and a waste heat grade raising device 119, and the steam condensate recovery machine 118 is provided with a receiving port 122 and a discharge port 123 The waste heat grade raising device 119 is provided with a second water inlet 120 and a second water outlet 121 , the receiving port 122 receives steam or condensed water, the discharge port 123 is connected to the second water inlet 120 , and the second water outlet 121 is connected to the water supply port 103 .

The water supply pool 112 is used as a water source to supply water for the recovery and utilization system of the entire boiler waste heat. The setting of the replenishment solenoid valve 115 and the water level controller 116 keeps the water level in the hot water storage tank 111 at a preset height. The hot water storage tank 111 supplies water to the heat exchange tank 105 through the hot water circulation pump 110. If the water storage tank 111 always maintains a certain amount of water, the heat exchange tank 105 will not be dry-boiled, reducing the failure of the heat exchange tank 105. The hot water in the heat exchange tank 105 passes through the hot water storage tank 111 and the feed water pump 113 in sequence, and then is added to the boiler 101 to recover the waste heat of the flue gas.

Because hard water is easy to scale, it may cause blockage to equipment or pipelines after scaling. Referring to Fig. 3, a boiler waste heat recycling system, the system is not easy to scale, the boiler 101 is provided with a water supply port 103 and a high-temperature flue gas outlet 102, the boiler waste heat recovery system includes a flue gas waste heat recovery device, the flue gas waste heat recovery The device includes a water supply device 104 and a heat exchange tank 105. The heat exchange tank 105 is provided with a smoke outlet 107 and a smoke inlet 106 connected to the high temperature flue gas outlet 102. The water exchange tank 105 is also provided with a first water inlet 108 and a first outlet. The water outlet 109, the water supply device 104 includes a hot water circulation pump 110, a hot water storage tank 111, a water supply pool 112 and a water supply pump 113, and the first water outlet 109 is connected to the water supply port 103 through the hot water storage tank 111 and the water supply pump 113 in sequence. The hot water storage tank 111 is connected to the first water inlet 108 of the heat exchange tank 105 through a hot water circulation pump 110 . The top of the hot water storage tank 111 is provided with an elbow-type ventilation pipe, and the hot water storage tank 111 is also provided with a compensation water inlet 114 for compensating the amount of water, a replenishment solenoid valve 115 connected to the compensation water inlet 114, and a water replenishment solenoid valve 115 for controlling opening or closing. The closed water level controller 116, the compensation water inlet 114 and the water supply tank 112 are all connected to an ion exchange 117. The water supply pool 112 is also connected to the water supply port 103 through a water supply pump 113 .

In order to reduce damage caused by blockage, the system uses ion exchange 117 as a water source, and ion exchange 117 converts ordinary hard water into soft water to supply water for the recovery and utilization system of boiler waste heat.

The recovery and utilization system of boiler waste heat also includes a steam condensate waste heat recovery device, which includes a steam condensate recovery machine 118 and a waste heat grade raising device 119, and the steam condensate recovery machine 118 is provided with a receiving port 122 and a discharge port 123 The waste heat grade raising device 119 is provided with a second water inlet 120 and a second water outlet 121 , the receiving port 122 receives steam or condensed water, the discharge port 123 is connected to the second water inlet 120 , and the second water outlet 121 is connected to the water supply port 103 .

In order to increase the applicable scope of the recovery and utilization system of boiler waste heat, the embodiment of the utility model provides another recovery and utilization system of boiler waste heat, which includes the following structures in addition to the structure shown in Figure 3:

Referring to Fig. 4, the waste heat grade raising device 119 is provided with a flue passage, and the waste heat grade raising device 119 is connected between the boiler 101 and the heat exchange tank 105 through the flue passage, and the feed water pump 113 is also connected to the water supply port 103 through the waste heat grade raising device 119 . A dust collector 124 and an induced draft fan 125 are arranged between the heat exchange tank 105 and the waste heat grade raising device 119

In actual use, the waste heat level raising device 119 can be an economizer or a finned heat pipe group, and the effect of using an economizer is better.

The boiler waste heat recovery and utilization system includes a flue gas waste heat recovery device and a steam condensate water waste heat recovery device, and the flue gas waste heat recovery device recovers and utilizes waste heat in the flue gas discharged from the boiler 101 . The steam condensate waste heat recovery device recovers and utilizes the waste heat in the steam used by the steam consuming equipment.

The steam condensate recovery machine 118 receives the water vapor used by the steam-using equipment, and then the water vapor mixture enters the waste heat grade raising device 119. The waste heat grade raising device 119 is a pressurized device. temperature reaches 130°C), and then enters the boiler 101 through the water supply port 103. Due to the high temperature, the water-steam mixture quickly vaporizes after entering the drum to form new steam for reuse by steam-consuming equipment. recycling.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (9)

1. the recycling system of a boiler afterheat, it is characterized in that, described boiler is provided with admission port and high-temperature flue gas outlet, the recycling system of described boiler afterheat comprises flue gas waste heat recovery apparatus and steam condensed water waste heat retracting device, described flue gas waste heat recovery apparatus comprises water supply installation and heat-exchanging water tank, described heat-exchanging water tank be provided with exhaust opening and connect described high-temperature flue gas outlet enter mouth, described heat-exchanging water tank is also provided with the first water inlet and the first delivery port, described first water inlet connects described water supply installation, described first delivery port connects described admission port, described water supply installation connects described admission port,

Described steam condensed water waste heat retracting device comprises reclamation of condensate water machine and waste heat grade lifting device, described reclamation of condensate water machine is provided with receiving port and outlet, described waste heat grade lifting device is provided with the second water inlet and the second delivery port, described receiving port receives steam or condensate water, described outlet connects described second water inlet, and described second delivery port connects described admission port.

2. the recycling system of boiler afterheat according to claim 1, it is characterized in that, described water supply installation comprises hot water circulating pump, heat storage water tank, feed cistern and feed pump, described first delivery port connects described admission port by described heat storage water tank, described feed pump successively, and described heat storage water tank connects the first water inlet of described heat-exchanging water tank by described hot water circulating pump; Described feed cistern connects described admission port by described feed pump; Described heat storage water tank is also provided with the compensation water inlet for compensating the water yield, and described compensation water inlet connects described feed cistern.

3. the recycling system of boiler afterheat according to claim 1, it is characterized in that, described water supply installation comprises hot water circulating pump, heat storage water tank, feed cistern, feed pump and ion exchanger, described first delivery port connects described admission port by described heat storage water tank, described feed pump successively, and described heat storage water tank connects the first water inlet of described heat-exchanging water tank by described hot water circulating pump; Described feed cistern connects described admission port by described feed pump; Described heat storage water tank is also provided with the compensation water inlet for compensating the water yield, and described compensation water inlet is all connected described ion exchanger with described feed cistern.

4. the recycling system of the boiler afterheat according to Claims 2 or 3, it is characterized in that, described heat storage water tank is provided with the moisturizing magnetic valve connecting described compensation water inlet, and described heat storage water tank is also provided with the water level controller controlling described moisturizing magnetic valve and open or close.

5. the recycling system of boiler afterheat according to claim 4, is characterized in that, the top of described heat storage water tank is provided with bent tube type breather pipe.

6. the recycling system of boiler afterheat according to claim 5, it is characterized in that, described waste heat grade lifting device is also provided with smoke uptake, described waste heat grade lifting device is connected between described boiler and described heat-exchanging water tank by described smoke uptake, and described feed pump also connects described admission port by described waste heat grade lifting device.

7. the recycling system of boiler afterheat according to claim 6, is characterized in that, is provided with deduster and air-introduced machine between described heat-exchanging water tank and described waste heat grade lifting device.

8. the recycling system of the boiler afterheat according to any one of claim 6 or 7, is characterized in that, described waste heat grade lifting device is economizer.

9. the recycling system of the boiler afterheat according to any one of claim 6 or 7, is characterized in that, described waste heat grade lifting device is finned heat pipe group.