阅读说明：本技术 一种锅炉给水除氧系统及方法 (Boiler water supply deoxidization system and method ) 是由 彭红林 于 2019-10-31 设计创作，主要内容包括：本发明公开一种锅炉给水除氧系统及方法,系统包括除氧器和除盐水箱,除氧器上部为除氧塔,除氧器下部为除氧水箱和除氧射水箱,除氧塔和除氧水箱连通,除氧塔顶部设有排气口Ⅰ,除氧射水箱顶部设有除氧射水进水口,除氧射水箱底部设有除氧射水出水口,除氧射水箱中部设有溢水口,除氧射水箱上方设有水喷射器,所述排气口Ⅰ与水喷射器的进气口相连；所述除盐水箱上设有除盐水进水口和除盐水出水口,除盐水进水口通过管道与除氧射水箱上的溢水口相连,除盐水出水口通过管道与除氧射水进水口相连。本发明省去了化学辅助除氧系统,增设了除盐水箱的循环水箱,避免了化学辅助除氧添加药剂对设备的腐蚀,有利于设备的维护保养。(The invention discloses a boiler water supply deoxidization system and a method, wherein the system comprises a deaerator and a desalting water tank, the upper part of the deaerator is provided with a deaerating tower, the lower part of the deaerator is provided with a deoxidization water tank and a deoxidization water injection tank, the deaerating tower is communicated with the deoxidization water tank, the top of the deaerating tower is provided with an exhaust port I, the top of the deoxidization water injection tank is provided with a deoxidization water injection water inlet, the bottom of the deoxidization water injection tank is provided with a deoxidization water injection water outlet, the middle part of the deoxidization water injection tank is provided with an overflow port, a water injector; the desalting water tank is provided with a desalting water inlet and a desalting water outlet, the desalting water inlet is connected with an overflow gap on the deoxidizing water jetting tank through a pipeline, and the desalting water outlet is connected with the deoxidizing water jetting water inlet through a pipeline. The invention omits a chemical auxiliary deoxidizing system, is additionally provided with the circulating water tank of the desalting water tank, avoids the corrosion of chemical auxiliary deoxidizing agent to equipment, and is beneficial to the maintenance of the equipment.)

1. A boiler water supply deoxidization system is characterized by comprising a deaerator and a desalting water tank, wherein the deaerator is in an inverted T shape, the upper part of the deaerator is provided with a deaerating tower, the lower part of the deaerator is provided with a deaerating water tank and a deaerating water injection tank, the deaerating water tank and the deaerating water injection tank are separated by a partition plate, the deaerating tower is communicated with the deaerating water tank, and the lower part of the deaerating water tank is provided with a deaerating water outlet; the top of the deoxidizing tower is provided with an exhaust port I, the body of the deoxidizing tower is provided with a water inlet to be deoxidized, the top of the deoxidizing water jet box is provided with a water return port and a deoxidizing water jet water inlet, the bottom of the deoxidizing water jet box is provided with a deoxidizing water jet water outlet, the middle of the deoxidizing water jet box is provided with an overflow port, a water ejector is arranged above the deoxidizing water jet box, the water inlet of the water ejector is connected with the deoxidizing water jet water outlet through a pipeline, the pipeline is provided with a water pump I, the mixed liquid outlet of the water ejector is connected with the water return port of the deoxidizing water jet box, and the; be equipped with demineralized water inlet and demineralized water delivery port on the demineralized water tank, the demineralized water inlet passes through the overflow gap that pipeline and deoxidization jetted water on the case and links to each other, and the demineralized water delivery port passes through the pipeline and links to each other with deoxidization jetted water inlet, is equipped with water pump II on this pipeline, and the deoxidization jetted water case is gone into to demineralized water pump II in the demineralized water tank.

2. The boiler water supply deoxidization system according to claim 1, wherein a second exhaust port is arranged at the top of the deoxidization water tank, the second exhaust port is connected with the air inlet of the water injector through a pipeline, and a valve is arranged on the pipeline.

3. The boiler water supply deoxidization system of claim 1, wherein a heating jacket is arranged outside the deoxidization water tank, a circulating water inlet and a circulating water outlet are arranged on the heating jacket, and hot water forms water circulation in the heating jacket.

4. The boiler water supply deoxidization system according to claim 1, wherein two parallel pipelines are arranged between the water inlet of the water injector and the deoxidization water injection water outlet, and each pipeline is provided with a water pump.

5. The boiler feed water deoxidization system of claim 1, wherein a stirring paddle is arranged in the deoxidization water tank, a stirring rod of the stirring paddle penetrates out of the deoxidization water tank shell, and the stirring rod is fixed on the deoxidization water tank shell through a sealing bearing.

6. The boiler feed water deoxygenation system of claim 5, wherein the stirring paddle is arranged at the top of the deoxygenation water tank; or the stirring paddle is arranged at the side end of the deoxygenation water tank, and the other end of the stirring rod is fixed on the partition plate through a bearing.

7. A method for deoxidizing boiler feed water of an oxygen removal system, which is characterized in that the method for deoxidizing the boiler feed water by using the boiler feed water oxygen removal system of any one of claims 1 to 6 comprises the following steps:

(1) heating the deoxygenation water tank to 40-45 ℃;

(2) starting a water pump I and a water ejector, vacuumizing the deoxygenation water tank, and setting the vacuum degree to be-80 Pa;

(3) and (3) starting a water pump II, pumping the demineralized water in the demineralized water tank into the deoxidizing water jetting tank by the water pump II, mixing the high-temperature water in the deoxidizing water jetting tank, reducing the water temperature of the deoxidizing water jetting tank, and adjusting the direct-discharge water in the deoxidizing water jetting tank to the demineralized water tank until the water level is balanced and the water level is continuously circulated.

8. The method for deoxidizing boiler feed water of a deoxidizing system of claim 7, wherein the temperature of water in the deoxidizing water jet is controlled to be 45 ℃.

Technical Field

The invention belongs to the field of boiler feed water treatment, and particularly relates to a boiler feed water deoxygenation system and method.

Background

In the process of boiler feed water treatment, oxygen removal is a very critical link. Oxygen is a main corrosive substance of a water supply system and a boiler, and the oxygen in the water supply should be quickly removed, otherwise, the oxygen can corrode the water supply system and parts of the boiler, iron oxide which is a corrosion product can enter the boiler and deposit or attach on the pipe wall and the heated surface of the boiler to form indissolvable iron scale with poor heat transfer, and pitting can occur on the inner wall of a pipeline due to corrosion, so that the resistance coefficient is increased. When the pipeline is seriously corroded, even pipeline explosion accidents can happen. The oxygen is required to be removed from a steam boiler with the evaporation capacity of more than or equal to 2 tons per hour and a hot water boiler with the water temperature of more than or equal to 95 ℃ specified by the state. Numerous boiler feedwater treatment workers have been seeking efficient and economical methods of oxygen removal over the years, with vacuum oxygen removal being an excellent one.

The working principle of vacuum deoxygenation is to apply henry's law and dalton's law, from which it is known that in a closed container, any gas is present on the water surface at the same time, and the solubility of the gas is directly proportional to its own partial pressure, and the solubility of the gas is only related to its own partial pressure. At a certain pressure, as the temperature of the water increases, the partial pressure of the water vapor increases, while the partial pressures of the air and oxygen become smaller and smaller. At 100 ℃, the partial pressure of oxygen is reduced to zero, and the dissolved oxygen in water is also reduced to zero. When the pressure above the water surface is less than atmospheric pressure, the solubility of oxygen may also reach zero at lower water temperatures. Thus, the oxygen molecules in the space above the water surface are discharged or converted into other gases, so that the partial pressure of the oxygen is zero, and the oxygen in the water continuously escapes, thereby achieving the effect of removing oxygen. The vacuum deaerator is based on the principle and is equipment for boiling water at low temperature under vacuum and removing oxygen, nitrogen, carbon dioxide and other gases contained in the water.

However, practice shows that the effect of the single deaerator is poor, and in the production operation of our factory, because the deaerator is poor in effect, the mode of vacuum deaeration and chemical auxiliary deaeration is adopted for operation, although the deaeration effect reaches the operation requirement, the chemical residue added by the chemical auxiliary deaeration has certain harm to a steam turbine, a boiler and a steam pipeline, and the effect is unstable.

Disclosure of Invention

In order to solve the problems that the prior art has poor deoxidizing effect due to the use of a deaerator alone, and chemical auxiliary deoxidizing agent-added residues of vacuum deoxidizing and chemical auxiliary deoxidizing have certain harm to a steam turbine, a boiler and a steam pipeline and have unstable effect, the invention provides a boiler water supply deoxidizing system and a boiler water supply deoxidizing method.

In order to achieve the purpose, the invention adopts the following technical scheme:

a boiler water supply deoxidization system comprises a deaerator and a desalting water tank, wherein the deaerator is inverted T-shaped, the upper part of the deaerator is provided with a deaerating tower, the lower part of the deaerator is provided with a deoxidization water tank and a deoxidization water injection tank, the deoxidization water tank and the deoxidization water injection tank are separated by a partition plate, the deaerating tower is communicated with the deoxidization water tank, and the lower part of the deoxidization water tank is provided with a deoxidization water outlet; the top of the deoxidizing tower is provided with an exhaust port I, the body of the deoxidizing tower is provided with a water inlet to be deoxidized, the top of the deoxidizing water jet box is provided with a water return port and a deoxidizing water jet water inlet, the bottom of the deoxidizing water jet box is provided with a deoxidizing water jet water outlet, the middle of the deoxidizing water jet box is provided with an overflow port, a water injector is arranged above the deoxidizing water jet box, the water inlet of the water injector is connected with the deoxidizing water jet water outlet through a pipeline, the pipeline is provided with a water pump I, the mixed liquid outlet of the water injector is connected with the water return port of the deoxidizing water jet box, and the exhaust; be equipped with demineralized water inlet and demineralized water delivery port on the demineralized water tank, the demineralized water inlet passes through the overflow gap that pipeline and deoxidization jetted water on the case and links to each other, and the demineralized water delivery port passes through the pipeline and links to each other with deoxidization jetted water inlet, is equipped with water pump II on this pipeline, and the deoxidization jetted water case is gone into to demineralized water pump II in the demineralized water tank.

Furthermore, an exhaust port II is arranged at the top of the deaerating water tank and connected with an air inlet of the water ejector through a pipeline, and a valve is arranged on the pipeline.

Furthermore, a heating sleeve is arranged outside the deoxidizing water tank, a circulating water inlet and a circulating water outlet are formed in the heating sleeve, and hot water forms water circulation in the heating sleeve.

Furthermore, two parallel pipelines are arranged between the water inlet of the water injector and the oxygen removal water injection water outlet, and a water pump is respectively arranged on each pipeline.

Furthermore, be equipped with the stirring rake in the deoxidization water tank, the puddler of stirring rake wears out deoxidization water tank shell, and the puddler passes through sealed bearing to be fixed on deoxidization water tank shell.

Further, the stirring paddle is arranged at the top of the deoxygenation water tank; or the stirring paddle is arranged at the side end of the deoxygenation water tank, and the other end of the stirring rod is fixed on the partition plate through a bearing.

The boiler feed water deoxygenation method based on the deoxygenation system comprises the following steps of:

(1) heating the deoxygenation water tank to 40-45 ℃;

(2) starting a water pump I and a water ejector, vacuumizing the deoxygenation water tank, and setting the vacuum degree to be-80 Pa;

(3) and (3) starting a water pump II, pumping the demineralized water in the demineralized water tank into the deoxidizing water jetting tank by the water pump II, mixing the high-temperature water in the deoxidizing water jetting tank, reducing the water temperature of the deoxidizing water jetting tank, and adjusting the direct-discharge water in the deoxidizing water jetting tank to the demineralized water tank until the water level is balanced and the water level is continuously circulated.

Further, the temperature of water in the oxygen removal water jet tank was controlled at 45 ℃.

Compared with the prior art, the invention has the beneficial effects that:

(1) the system of the invention omits a chemical auxiliary deoxygenation system, and is additionally provided with a circulating water tank of a demineralized water tank, wherein the demineralized water tank is provided with a demineralized water inlet and a demineralized water outlet, the demineralized water inlet is connected with an overflow port on the deoxygenation water injection tank through a pipeline, the demineralized water outlet is connected with the deoxygenation water injection inlet through a pipeline, the pipeline is provided with a water pump II, the demineralized water in the demineralized water tank is pumped into the deoxygenation water injection tank by the water pump II, redundant water in the deoxygenation water injection tank flows back to the demineralized water tank through the overflow port, and the demineralized water tank and the deoxygenation water injection tank form circulation. In water jet ware always working process, the temperature in the deoxidization jetting case constantly risees, and the low-temperature demineralized water pump income deoxidization jetting case in water pump II in with the demineralized water case, the high temperature demineralized water in the deoxidization jetting case flows out from the gap to in the demineralized water case, adjust to water level balance, so circulation reduces the temperature in the deoxidization jetting case, improves evacuation efficiency. The invention realizes that the dissolved oxygen in the deoxygenated water is less than 5ug/L, the deoxygenation effect meets the operation requirement, and no chemical auxiliary deoxygenation exists, thereby ensuring the safe operation of a steam turbine, a boiler and a steam pipeline, avoiding the corrosion of chemical auxiliary deoxygenation adding agents to equipment, and being beneficial to the maintenance of the equipment.

(2) The water temperature of the deoxidizing water injection tank is high, water needs to be changed for 1-2 times during operation of each shift at ordinary times, and the deoxidizing water injection tank is drained to the circulating water pool. In addition, high-temperature water circulated by the deoxidizing water-jetting tank returns to the demineralized water tank, the temperature of demineralized water rises, the temperature of boiler feed water rises, the boiler efficiency is improved, the power generation capacity is improved, and the income is increased.

(3) The method cancels chemical auxiliary deoxidization, decides to reduce the water temperature of a deoxidization water injection tank according to the working principle of a vacuum deoxidization device, namely adds a water pump, replenishes the demineralized water in the demineralized water tank to the deoxidization water injection tank, directly discharges water into the deoxidization water injection tank, adjusts the water level to be balanced, and continuously circulates all the time, thereby achieving the purpose of reducing the water temperature in the deoxidization water injection tank, improving the working efficiency of the vacuum deoxidization device, ensuring the safety of unit equipment, reducing the water temperature of the deoxidization water tank to 45 ℃, improving the vacuum of the deoxidization device to-80 Pa and reducing the dissolved oxygen to below 5ug/L, and achieving the deoxidization effect meeting the operation requirement.

(4) The invention cancels the chemical auxiliary deoxidization, thereby canceling the chemical auxiliary deoxidization system, reducing the equipment maintenance cost of the chemical auxiliary deoxidization system and saving the chemical agent cost.

(5) In the prior art, because the temperature of the deoxygenation water injection tank is high, water needs to be changed for 1-2 times during operation of each shift at ordinary times and is discharged to the circulating water tank, high-temperature water circulating in the deoxygenation water injection tank is returned to the desalination water tank for recycling, and the water cost is saved; according to the invention, the high-temperature water circulated by the deoxidizing water jet tank returns to the demineralized water tank, the temperature of the demineralized water rises, the temperature of the boiler feed water rises, the boiler efficiency is improved, the generated energy is improved, and the income is increased.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of a deoxygenated water tank and a deoxygenated water jet tank;

FIG. 3 is a schematic view of the structure with the addition of an exhaust port II;

FIG. 4 is a schematic view of the structure after the addition of a heating jacket;

FIG. 5 is a cross-sectional view of the deoxygenated water tank and deoxygenated water jet tank after the addition of a heating jacket;

FIG. 6 is a schematic structural view of a parallel pipeline additionally arranged between a water injector and a deoxidizing water-jetting tank;

FIG. 7 is a schematic view of the addition of a vertical paddle;

FIG. 8 is a schematic diagram of the addition of a horizontally oriented paddle.

In the figure, 1-a deaerating tower, 101-an exhaust port I, 102-a water inlet to be deaerated; 2-a deoxygenated water tank, 201-a deoxygenated water outlet, 202-a circulating water inlet, 203-a circulating water outlet, 204-an exhaust port II, 3-a deoxygenated water jetting tank, 301-a water return port, 302-a deoxygenated water jetting inlet, 303-a deoxygenated water jetting outlet, 304-an overflow port, 305-a water pump I, 4-a partition plate, 5-a water injector, 6-a demineralized water tank, 601-a demineralized water inlet, 602-a demineralized water outlet, 603-a water pump II, 7-a stirring paddle, 701-a stirring rod and 702-a sealed bearing.

Detailed Description

In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.