CN206582830U - The boiler deoxidizing method device of deaerated feedwater is heated using oxygen-eliminating device exhaust heat - Google Patents

Abstract

The utility model discloses a boiler deoxygenation device for heating deoxygenation feed water by using the exhaust waste heat of a deaerator, comprising a deaerator, a desalinated water tank, a deaerator feed water pump, an auxiliary economizer, and a plate heat exchanger. It is characterized in that: the outlet of the deaerator is connected to the low-pressure saturated steam output pipeline, the outlet of the low-pressure saturated steam output pipeline is connected with the inlet of the hot gas pipeline in the waste heat heat exchanger, and the outlet of the hot gas pipeline in the waste heat heat exchanger passes through the condensed water pipe connected to the upper end of the desalinated water tank; the outlet of the deaerator feedwater pump is connected to the inner chamber of the waste heat exchanger through the desalinated water pipe. In this deaeration device, due to the heat exchange between the low-pressure saturated steam and the desalinated water, the heat of the low-pressure saturated steam is utilized, the condensed water is increased, and the condensed water is recycled; while the desalinated water absorbs heat and increases the temperature , not only avoiding the waste of steam and heat, realizing the recovery of steam waste heat and condensed water, but also avoiding the heat pollution caused by steam exhaust.

Description

Boiler Deoxygenation Device Using Deaerator Exhaust Heat to Heat Deaeration Feed Water

technical field

The utility model relates to an improvement of a boiler deaeration device, specifically a device that can not only recycle the waste heat of low-pressure saturated steam, but also heat deaeration feed water, which can effectively reduce the heat loss caused by steam release and save the consumption of desalinated water. , At the same time recover the condensed condensate and use the waste heat of the deaerator exhaust to heat the deaeration feed water boiler deaeration device.

Background technique

The oxygen removal device in the boiler steam water system is the key oxygen removal equipment of the boiler feed water system. It removes dissolved oxygen in the water through the principle of thermal oxygen removal, thereby reducing the dissolved oxygen content in the boiler feed water and slowing down the oxygen corrosion of the boiler pipe by dissolved oxygen. . Because the oxygen removal device has the advantages of large processing capacity, good oxygen removal effect, and no impurities, it is widely used in the oxygen removal of boiler systems. In order to ensure all the dissolved oxygen is precipitated and not to discharge too much low-pressure steam to cause waste, the opening of the exhaust valve on the upper part of the deaerator tower should neither be too large nor too small. Generally, the opening of the exhaust valve is adjusted through adjustment experiments. At present, most domestic boiler feed water devices include deaerators, desalinated water tanks, deaerator feed water pumps, sub economizers, plate heat exchangers, and the inlet pipes of deaerator feed water pumps are connected to the bottom of the deaerator water tanks. , the outlet of the feed water pump of the deaerator is connected to the plate heat exchanger through the desalinated water pipe, heated by the plate heat exchanger and then sent to the secondary economizer, and then sent to the plate heat exchanger from the outlet of the secondary economizer. The other outlet of the plate heat exchanger is sent to the deaerator. The disadvantages of this kind of boiler deaeration device are: because the low-pressure saturated steam flow in the low-pressure saturated steam pipeline can generally reach 1 ton/hour, and the temperature is 104°C, it has a relatively large amount of heat, and it also contains more temperature. Condensed water at 104°C, this part of low-pressure steam waste heat and condensed water is not recycled, resulting in a certain degree of waste of steam heat and condensed water.

According to the clues, there are many reports on the improvement of boiler deaeration devices, and there are also reports on the utilization of waste heat, but the waste heat used is the waste heat of flue gas. So far, there have been no reports on using waste heat from deaerator exhaust to heat deaerator feed water and condensate recycling.

Contents of the invention

The purpose of this utility model is to provide a method that can not only recycle the waste heat of low-pressure saturated steam, but also heat deoxygenated feed water and recycle condensed water, which can effectively reduce the heat loss caused by steam release, save the consumption of desalinated water, and recycle at the same time The boiler deaeration device that uses the exhaust heat of the deaerator to heat the deaeration feed water after condensing the desalinated water.

In order to achieve the above purpose, the technical solution adopted by the utility model is: the boiler deaeration device that utilizes the waste heat of the deaerator exhaust to heat the deaeration feed water includes a deaerator, a desalinated water tank, a deaerator feed water pump, a sub province Coal heater, plate heat exchanger, the inlet pipe of the deaerator feed water pump is connected with the bottom of the desalted water tank, the outlet of the auxiliary economizer is connected with the first inlet of the plate heat exchanger, and passes through the plate heat exchanger The first outlet is connected to the inlet of the deaerator after heat exchange, and it is characterized in that: the outlet of the deaerator is connected to the low-pressure saturated steam output pipeline, and the outlet of the low-pressure saturated steam output pipeline is connected to the waste heat exchanger. The inlet of the hot gas pipeline is connected, and the outlet of the hot gas pipeline in the waste heat exchanger is connected to the upper end of the desalinated water tank through the condensed water pipe; the outlet of the deaerator feed water pump is connected to the inner cavity of the waste heat heat exchanger through the desalted water pipe.

The utility model is also implemented through the following measures: the outlet of the deaerator is provided with an exhaust valve, and by adjusting the opening of the exhaust valve, the flow rate of the low-pressure saturated steam in the low-pressure saturated steam output pipeline is controlled to be 1 ton/hour .

The beneficial effect of the utility model is that: the boiler deoxygenation device for heating the deoxygenated feed water by utilizing the exhaust heat of the deaerator, realizes the heat exchange between the low-pressure saturated steam and the demineralized water, so the heat of the low-pressure saturated steam is utilized, The condensed water is increased and the condensed water is recycled; the desalinated water absorbs heat and increases the temperature, which not only avoids the waste of steam and heat, realizes the recovery of steam waste heat and condensed water, but also avoids thermal pollution caused by steam exhaust. The trial proved that after implementation, 1 ton of condensed demineralized water can be recovered per hour, and the water temperature at the outlet of the deaerator feed water pump can be increased by 6°C, which has obvious implementation effects.

Description of drawings

Fig. 1 is a schematic front view of the structural assembly of the present invention.

detailed description

Make the utility model with reference to Fig. 1. The boiler deoxygenation device, which utilizes the exhaust heat of the deaerator to heat the deoxygenated feed water, includes a deaerator 1, a desalinated water tank 2, a deaerator feed water pump 3, a secondary economizer 4, and a plate heat exchanger 5. The inlet pipe of the feed water pump 3 is connected with the bottom of the desalinated water tank 2, the outlet of the auxiliary economizer 4 is connected with the first inlet a of the plate heat exchanger 5, and passes through the first outlet of the plate heat exchanger 5 b After the heat exchange, the pipeline 6 is connected to the inlet of the deaerator 1, which is characterized in that: the outlet of the deaerator 1 is connected to the low-pressure saturated steam output pipeline 7, and the outlet of the low-pressure saturated steam output pipeline 7 is connected to the waste heat exchanger The inlet of the hot gas pipeline in 8 is connected, and the outlet of the hot gas pipeline in the waste heat exchanger 8 is connected to the upper end of the desalted water tank 2 through the condensed water pipe 9; The inner cavity of the heat exchanger 8 is heated by the hot gas pipeline in the waste heat heat exchanger 8. At the same time, the temperature of the low-pressure saturated steam in the hot gas pipeline is also reduced through heat exchange, which increases condensation. Water, its condensed water flows in the desalinated water tank 2, has joined circulation.

As an improvement of the present utility model: the outlet of the deaerator 1 is provided with an exhaust valve 11, and by adjusting the opening of the exhaust valve 11, the flow rate of the low-pressure saturated steam in the low-pressure saturated steam output pipeline 7 is controlled to be 1 ton /Hour.

Claims (2)

1. the boiler deoxidizing method device of deaerated feedwater is heated using oxygen-eliminating device exhaust heat, including oxygen-eliminating device（1）, sweet-water tank（2）、 Deaerator feed water pump（3）, secondary economizer（4）, plate type heat exchanger（5）, deaerator feed water pump（3）Inlet tube and sweet-water tank （2）Interior bottom connection, secondary economizer（4）Outlet and plate type heat exchanger（5）First entrance（a）Connection, and pass through plate Formula heat exchanger（5）Primary outlet（b）The pipeline after heat exchange（6）Access oxygen-eliminating device（1）Entrance, it is characterised in that：It is described Oxygen-eliminating device（1）Outlet connection low-pressure saturated steam output channel（7）, low-pressure saturated steam output channel（7）Outlet with Afterheat heat exchanger（8）Interior hot gas duct entrance connection, afterheat heat exchanger（8）Interior hot gas duct outlet passes through water pipe after condensation （9）Access sweet-water tank（2）Upper end；Described deaerator feed water pump（3）Outlet pass through desalination water pipe（10）Connect waste heat Heat exchanger（8）Inner chamber.

2. utilization oxygen-eliminating device exhaust heat according to claim 1 heats the boiler deoxidizing method device of deaerated feedwater, its feature It is：Described oxygen-eliminating device（1）Outlet be provided with air bleeding valve（11）.