Energy-saving recycling system for steam boiler

Abstract

The utility model belongs to the technical field of boiler waste heat recovery, and in particular, relates to an energy-saving recycling system for steam boilers. The smoke outlet of the steam boiler is connected to a heat exchanger, the smoke outlet of the heat exchanger is connected to a condenser, and the condenser is connected to a smoke exhaust chimney; the water outlet of the heat exchanger is connected to the water replenishment port of the steam boiler through a pipeline; the cooling water inlet of the condenser is connected to a water tank through a water inlet pipeline, and the water outlet of the condenser is connected to the water tank through a return water pipeline; the water tank is connected to a deaerator through a guide pipe, and the deaerator is connected to a heat exchanger through a recovery pipeline. The utility model is an energy-saving recycling system for steam boilers with high thermal energy utilization.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler waste heat recovery, and in particular relates to an energy-saving recovery and utilization system of a steam boiler. Background Art

[0002] Steam boiler is the main equipment to convert the heat of natural gas into steam heat. There is a lot of heat loss in the conversion of primary energy to secondary energy, such as flue gas heat loss, sewage heat loss, condensed water heat loss, etc. In the existing technology, only a very small part of the flue gas heat is recycled to preheat the boiler feed water, and most of the heat is discharged as waste heat without recycling; this not only causes a lot of heat loss and does not save energy, but also causes "thermal pollution" and affects the environment.

[0003] On this basis, we propose an energy-saving recycling system for steam boilers. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an energy-saving recovery and utilization system for a steam boiler to solve the problem of low recovery and utilization rate of existing waste heat energy.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A steam boiler energy-saving recycling system comprises a steam boiler, a heat exchanger, a condenser, a water tank and a deaerator, wherein the smoke exhaust port of the steam boiler is connected to the heat exchanger, the smoke outlet of the heat exchanger is connected to the condenser, and the condenser is connected to the smoke exhaust chimney; the water outlet of the heat exchanger is connected to the water replenishment port of the steam boiler through a pipeline; the cooling water inlet of the condenser is connected to the water tank through a water inlet pipeline, and the water outlet of the condenser is connected to the water tank through a return water pipeline, during which the condenser heats the water in the water tank; the water tank is connected to the deaerator through a guide pipe, and the deaerator is connected to the heat exchanger through a recovery pipeline, the water in the water tank is heated by the condenser to increase the temperature and then introduced into the deaerator, and then enters the heat exchanger through the recovery pipeline after being heated and deoxygenated by the deaerator, and is directly used as boiler feed water after entering the heat exchanger.

[0007] Furthermore, the water in the water tank is softened water, and the water supply port of the water tank is connected to a softened water treatment device.

[0008] Furthermore, the return water pipe is provided with an electric regulating valve, and the electric regulating valve adjusts the opening of the electric valve according to the exhaust gas temperature.

[0009] Furthermore, a sewage pump group is provided on the upper part of the steam boiler, and the sewage pump group is connected to a flash tank through a first sewage pipe. The air outlet of the flash tank is connected to an air inlet of the deaerator through an air guide pipe. The flash steam generated by the flash tank enters the deaerator to heat the deoxygenated water therein.

[0010] Furthermore, the sewage outlet of the flash tank is connected to the water inlet of the heat exchange component in the water tank through a second sewage discharge conduit, and a sewage discharge port is provided at the outlet of the heat exchange component, through which the sewage is discharged.

[0011] In summary, due to the adoption of the above technical solution, the beneficial technical effects of the utility model are:

[0012] An energy-saving recycling system for steam boilers recycles and utilizes the heat energy in the steam boiler room system to the greatest extent possible through the setting of heat exchangers, condensers, water tanks and deaerators, thereby improving the energy efficiency of the boiler room and reducing the operating costs of the boiler room. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] In the figure: steam boiler 1, heat exchanger 2, condenser 3, water tank 4, deaerator 5, flash tank 6, sewage pump group 7, pipeline 8, recovery pipeline 9, first sewage conduit 10, return water pipeline 11, water inlet pipeline 12, second sewage conduit 13, air guide pipe 14, flow guide pipe 15, sewage outlet 16. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model content, and are not used to limit the utility model content.

[0016] Example 1

[0017] In this embodiment, Figure 1As shown, a steam boiler energy-saving recycling system includes a steam boiler 1, a heat exchanger 2, a condenser 3, a water tank 4 and a deaerator 5. The smoke outlet of the steam boiler 1 is connected to the heat exchanger 2, the smoke outlet of the heat exchanger 2 is connected to the condenser 3, and the condenser 3 is connected to the smoke exhaust chimney; the water outlet of the heat exchanger 2 is connected to the water replenishment port of the steam boiler 1 through a pipe 8; the cooling water inlet of the condenser 3 is connected to the water tank 4 through a water inlet pipe 12, and the water outlet of the condenser 3 is connected to the water tank 4 through a return water pipe 11. During this process, the condenser 3 heats the water in the water tank 4; the water tank 4 is connected to the deaerator 5 through a guide pipe 15, and the deaerator 5 is connected to the heat exchanger 2 through a recovery pipe 9. The water in the water tank 4 is heated by the condenser 3 to increase the temperature and then introduced into the deaerator 5, and then enters the heat exchanger 2 through the recovery pipe 9 after being heated and deoxygenated by the deaerator 5. After entering the heat exchanger 2, it is directly used as boiler feed water. The water in the water tank 4 is softened water, and a softened water treatment device is connected to the water supply port of the water tank 4. In order to recover the flue gas waste heat as much as possible, increase the water temperature, and achieve energy saving effect, an electric regulating valve is provided on the return water pipe 11, and the electric regulating valve adjusts the electric valve opening according to the exhaust gas temperature.

[0018] Example 2

[0019] In this embodiment, Figure 1 As shown, in order to recover the waste heat of the sewage discharged from the boiler, a sewage pump group 7 is provided on the upper part of the steam boiler 1. The sewage pump group 7 is connected to a flash tank 6 through a first sewage pipe 10. The air outlet of the flash tank 6 is connected to an air inlet of the deaerator 5 through an air guide pipe 14. The flash steam generated by the flash tank 6 enters the deaerator 5 to heat the deoxygenated water therein. In order to further recover the waste heat of the sewage, the sewage outlet of the flash tank 6 is connected to the water inlet of the heat exchange component provided in the water tank 4 through a second sewage pipe 13. A sewage outlet 16 is provided at the outlet of the heat exchange component. The sewage is discharged through the sewage outlet 16. After flash evaporation in the flash tank 6, the high-temperature sewage preheats the softened water in the water tank 4, which not only recovers the heat of the sewage, but also reduces the temperature of the sewage to avoid thermal pollution.

[0020] The above description is a preferred embodiment of the utility model content and is not intended to limit the utility model content. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model content should be included in the protection scope of the utility model content.

Claims

1. A steam boiler energy-saving recycling system, comprising a steam boiler (1), a heat exchanger (2), a condenser (3), a water tank (4) and a deaerator (5), characterized in that: The smoke outlet of the steam boiler (1) is connected to the heat exchanger (2), the smoke outlet of the heat exchanger (2) is connected to the condenser (3), and the condenser (3) is connected to the smoke exhaust chimney; the water outlet of the heat exchanger (2) is connected to the water supply port of the steam boiler (1) through a pipe (8); the cooling water inlet of the condenser (3) is connected to the water tank (4) through a water inlet pipe (12), and the water outlet of the condenser (3) is connected to the water tank (4) through a return water pipe (11); the water tank (4) is connected to the deaerator (5) through a guide pipe (15), and the deaerator (5) is connected to the heat exchanger (2) through a recovery pipe (9).

2. The energy-saving recycling system of a steam boiler according to claim 1, characterized in that: The water in the water tank (4) is softened water, and the water supply port of the water tank (4) is connected to a softened water treatment device.

3. The energy-saving recycling system of a steam boiler according to claim 1, characterized in that: The return water pipe (11) is provided with an electric regulating valve, which adjusts the opening of the electric valve according to the exhaust gas temperature.

4. The energy-saving recycling system of a steam boiler according to claim 1, characterized in that: A sewage pump group (7) is provided on the upper part of the steam boiler (1); the sewage pump group (7) is connected to a flash tank (6) via a first sewage pipe (10); and an air outlet of the flash tank (6) is connected to an air inlet of the deaerator (5) via an air guide pipe (14).

5. The energy-saving recycling system of a steam boiler according to claim 4, characterized in that: The sewage outlet of the flash tank (6) is connected to the water inlet of a heat exchange component provided in the water tank (4) via a second sewage discharge conduit (13); a sewage discharge outlet (16) is provided at the outlet of the heat exchange component, and the sewage is discharged through the sewage discharge outlet (16).

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