CN210979797U - Boiler feed water oxygenation equipment of thermal power factory - Google Patents
Boiler feed water oxygenation equipment of thermal power factory Download PDFInfo
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- CN210979797U CN210979797U CN201920985766.8U CN201920985766U CN210979797U CN 210979797 U CN210979797 U CN 210979797U CN 201920985766 U CN201920985766 U CN 201920985766U CN 210979797 U CN210979797 U CN 210979797U
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Abstract
The utility model relates to a boiler of thermal power factory is given water and is added oxygen equipment, export the oxygen pipeline including smart processing oxygen pipeline and oxygen-eliminating device, oxygen-eliminating device outlet pipe says and is connected to the output of oxygen-eliminating device, the input of smart processing oxygen pipeline connection to oxygen-eliminating device, still including filling the demineralized water tank that is equipped with oxygen-containing demineralized water and being used for inputing the demineralized water pressure boost of oxygen-containing demineralized water to condensate smart processing outlet pipe way and oxygen-eliminating device outlet pipe way's demineralized water pump, the input and the demineralized water tank of demineralized water pump are connected, the output is connected with condensate smart processing outlet pipe way and oxygen-eliminating device outlet pipe way respectively. Compared with the prior art, the utility model discloses utilize the oxygen-bearing demineralized water to supply oxygen, can improve the control accuracy who adds oxygen.
Description
Technical Field
The invention relates to a water supply and oxygen adding device, in particular to a boiler water supply and oxygen adding device of a thermal power plant.
Background
The boiler feed water oxygenation treatment is an advanced treatment process for solving the problems of scaling of the heating surface of a supercritical boiler and deposition and corrosion of a turbine through-flow component at present, and is also one of effective measures for realizing energy conservation and consumption reduction of a large thermal generator set. The existing boiler feed water oxygenation treatment is basically that a bottled oxygen cylinder is added to three oxygenation points of fine treatment outlet condensed water, deaerator outlet feed water and high pressure water drainage through a busbar, a pressure reducing valve, a mass flow meter, a back pressure valve and the like. The method is characterized in that the water supply and the oxygen addition are realized by filling oxygen into a pressure container with desalted water through a liquid oxygen adding device (firstly, oxygen is filled into the pressure container with desalted water, and enriched water is formed in the pressure container), and adding oxygen-enriched water into three oxygen adding points of fine treatment outlet condensed water, deaerator outlet water supply and high-pressure water addition through a metering pump. The automatic oxygenation device is expensive, a set of three-point water supply and oxygenation device is about 80 ten thousand, a set of two-point water supply and oxygenation device is 50 ten thousand, the unit needs to consume one bottle of oxygen every day, 300 bottles of oxygen are consumed in three hundred days, and the total is 6000 yuan.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide boiler feed water oxygenation equipment for a thermal power plant.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a thermal power factory boiler feedwater adds oxygen equipment, exports the oxygen pipeline including smart processing oxygen pipeline and oxygen-eliminating device, oxygen-eliminating device export adds the output of oxygen pipeline connection to the oxygen-eliminating device, the input of smart processing oxygen pipeline connection to oxygen-eliminating device still including filling the demineralized water case that has oxygen-containing demineralized water and being used for with oxygen-containing demineralized water pressure boost input to the demineralized water pump of smart processing oxygen pipeline and oxygen-eliminating device export oxygen pipeline, the input and the demineralized water case of demineralized water pump are connected, and the output is connected with smart processing oxygen pipeline and oxygen-eliminating device export oxygen pipeline respectively.
The fine processing oxygenation pipeline comprises a condenser, a condensate pump, a fine processing outlet and a condensate pump inlet oxygenation pipeline, the condenser, the condensate pump and the fine processing outlet are sequentially connected, the input end of the condensate pump inlet oxygenation pipeline is connected to the output end of the desalting water pump, the output end of the condensate pump inlet oxygenation pipeline is connected to the input end of the condensate pump, and the input end of the condenser is connected to the output end of the desalting water pump.
The condensate pump inlet oxygenation pipeline comprises a first regulating valve, wherein the input end of the first regulating valve is connected to the output end of the desalting water pump, and the output end of the first regulating valve is connected to the input end of the condensate pump.
And a first check valve is arranged between the first regulating valve and the demineralized water pump.
And a second stop valve is arranged between the first regulating valve and the condensate pump.
And a first stop valve is arranged between the condenser and the demineralized water pump.
The deaerator outlet oxygenation pipeline comprises a second check valve, a third check valve, a booster pump, a second regulating valve and a fourth check valve which are sequentially connected, the input end of the second check valve is connected to the output end of the demineralized water pump, and the output end of the fourth check valve is connected to the deaerator outlet oxygenation pipeline.
The output end of the deaerator is connected to the economizer, a first inlet dissolved oxygen sensor is arranged at the inlet of the deaerator, and a second inlet dissolved oxygen sensor is arranged on the inlet pipeline of the economizer.
Compared with the prior art, the invention has the following beneficial effects:
1) the boiler of the thermal power generating set is used for supplying water and oxygen by supplementing demineralized water rich in dissolved oxygen to the condenser instead of an external oxygen bottle due to water vapor loss, and an additional oxygen supply device and equipment are not needed.
2) Because the desalted water amount of the supplementary condenser is larger, compared with direct oxygen addition, the problems that the added oxygen amount is less, the control is difficult, the fluctuation of the oxygen amount in the feed water is large, the automatic oxygen addition device is expensive and the like can be avoided.
Drawings
FIG. 1 is a schematic diagram of a conventional feedwater oxygenation system;
FIG. 2 is a schematic diagram of a simple implementation of the present invention;
FIG. 3 is a schematic structural view of the present invention;
wherein: 1. the system comprises a desalted water tank, 2, a desalted water pump, 3, a fine treatment oxygenation pipeline, 4, a deaerator outlet oxygenation pipeline, 5, a deaerator, 31, a first stop valve, 32, a condenser, 33, a condensate pump, 34, a fine treatment outlet, 35, a first check valve, 36, a first regulating valve, 37, a second stop valve, 41, a second check valve, 42, a third stop valve, 43, a booster pump, 44, a second regulating valve, 45, a fourth stop valve, 101, an oxygen cylinder, 102, a stop valve, 103, a pressure reducing valve, 104, a regulating valve, 105, a stop valve, 106, a check valve, 107, a stop valve, 108 and a check valve.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Fig. 1 is a schematic diagram of a conventional water-feeding and oxygen-adding system, which provides an oxygen source through an oxygen cylinder 1, and a trunk line is provided with a stop valve 102, a pressure reducing valve 103 and a regulating valve 104, and then divided into two paths, wherein one path includes a stop valve 105 and a check valve 106, and then goes to a condensate polishing outlet, and the other path goes to a deaerator outlet through a stop valve 107 and a check valve 108.
The utility model provides a boiler feedwater oxygenation equipment of thermal power factory, as shown in figure 2, export oxygenation pipeline 4 including smart processing oxygenation pipeline 3 and oxygen-eliminating device, oxygen-eliminating device export oxygenation pipeline 4 is connected to the output of oxygen-eliminating device 5, smart processing oxygenation pipeline 3 is connected to the input of oxygen-eliminating device 5, still including the demineralized water case 1 that is filled with oxygen-containing demineralized water with be used for with oxygen-containing demineralized water pressure boost input to the demineralized water pump 2 of smart processing oxygenation pipeline 3 and oxygen-eliminating device export oxygenation pipeline 4, the input and the demineralized water case 1 of demineralized water pump 2 are connected, the output is connected with smart processing oxygenation pipeline 3 and oxygen-eliminating device export oxygenation pipeline 4 respectively.
As shown in fig. 3, the fine processing oxygenation pipeline 3 comprises a condenser 32, a condensate pump 33, a fine processing outlet 34 and a condensate pump inlet oxygenation pipeline, the condenser 32, the condensate pump 33 and the fine processing outlet 34 are sequentially connected, an input end of the condensate pump inlet oxygenation pipeline is connected to an output end of the desalination water pump 2, an output end of the condensate pump inlet oxygenation pipeline is connected to an input end of the condensate pump 33, and an input end of the condenser 32 is connected to an output end of the desalination water pump 2.
The condensate pump inlet oxygenation line includes a first regulator valve 36, the input of the first regulator valve 36 being connected to the output of the demineralized water pump 2, the output being connected to the input of the condensate pump 33.
A first check valve 35 is arranged between the first regulating valve 36 and the demineralized water pump 2.
A second stop valve 37 is provided between the first regulating valve 36 and the condensate pump 33.
A first shut-off valve 31 is provided between the condenser 32 and the demineralized water pump 2.
The deaerator outlet oxygenation pipeline 4 comprises a second check valve 41, a third check valve 42, a booster pump 43, a second regulating valve 44 and a fourth check valve 45 which are sequentially connected, the input end of the second check valve 41 is connected to the output end of the demineralized water pump 2, and the output end of the fourth check valve 45 is connected to the deaerator outlet oxygenation pipeline.
The output of oxygen-eliminating device 5 is connected to the economizer, the import of oxygen-eliminating device 5 is equipped with first import dissolved oxygen sensor, be equipped with second import dissolved oxygen sensor on the economizer inlet pipeline, equipment still includes the controller, the output of first import dissolved oxygen sensor and second import dissolved oxygen sensor all is connected to the controller, the output of controller is connected to first governing valve 36 and second governing valve 44 respectively, the controller is according to first import dissolved oxygen sensor and the size that second import dissolved oxygen sensor gathered dissolved oxygen data come the aperture of controlling first governing valve 36 and second governing valve 44 and dissolve oxygen content and the economizer import dissolved oxygen control at certain within range with the oxygen-eliminating device.
The specific oxygen adding control process can be selected to be consistent with the existing mode, and the difference is only that the required added amount of the desalted water is obtained by converting the oxygen concentration in the desalted water according to the oxygen adding amount.
The method comprises the steps of controlling the inlet dissolved oxygen of the deaerator to be in a closed state by adjusting the opening of the deaerator inlet to 50-100 mu g/L, closing the deaerator to an exhaust valve during the water supply and oxygen adding operation of a boiler, controlling the opening of the economizer outlet to be in the atmosphere when the inlet dissolved oxygen of the economizer is larger than 30 mu g/L, controlling the outlet of the economizer to be in an open state when the inlet dissolved oxygen of the economizer is smaller than 30 mu g/L and the inlet dissolved oxygen of the economizer to be in an open state when the inlet dissolved oxygen of the economizer is smaller than 30 mu g/L, and controlling the outlet of the deaerator to be in an open state when the inlet dissolved oxygen of the economizer is smaller than 30 mu g/L mu g/L mu g/min.
According to Henry's law DO2＝K×PO2
DO2: water dissolved oxygen content
K: henry constant
PO2: partial pressure of oxygen in air
The dissolved oxygen in water has close relationship with the partial pressure of oxygen in air, atmospheric pressure, water temperature and water quality.
The temperature of the desalted water of the power plant is basically between 10 and 30 ℃, the temperature has larger influence on the dissolved oxygen in the water, and the atmospheric pressure has smaller influence on the dissolved oxygen in the water due to smaller variation range. In the case of atmospheric pressure 100KPa, theoretically the values of dissolved oxygen in water at different temperatures are shown in table 1.
TABLE 1
| Temperature of | Dissolved oxygen in water (100KPa) mg/l |
| 10 | 11.3 |
| 20 | 9 |
| 30 | 7.5 |
The dissolved oxygen in the measured desalted water tank of a certain power plant is shown in Table 2
TABLE 2
| Water sample | Temperature of | Oxygen content mg/l of |
| 1 | 18.5 | 8.05 |
| 2 | 18.9 | 8.09 |
| 3 | 18.7 | 7.99 |
| 4 | 19.4 | 7.95 |
| 5 | 18.8 | 8.01 |
| 6 | 20.4 | 8.02 |
| 7 | 20.3 | 8.15 |
| 8 | 20.4 | 7.73 |
Under the condition of 20 ℃ and 100kPa, approximately 8 mg/L of dissolved oxygen in desalted water, a boiler thermodynamic system has certain loss of water vapor, generally, about 1-3% of desalted water supplement is supplemented into a condenser by a desalted water pump, the water vapor loss rate of a unit with the power industry standard D L/T236 is less than or equal to 1.0% due to chemical supervision, the water vapor loss rate of the unit with the power quality of more than 600MW is less than or equal to 1.0%, the water vapor loss rate of a unit with the power quality of 300MW is less than or equal to 1.50%, the water vapor loss rate of a unit with the power quality of 200MW is less than or equal to 2.0%, the water vapor loss rate of the unit with the power quality of 100MW is less than or equal to 3.0%, the water supplement rate of the unit is generally higher than 0.5% than the water vapor loss rate due to other production and non-production consumption steam, the water supplement rate of the unit is generally higher than 0.5% than the water vapor loss rate, as the desalted water source is natural water, the dissolved oxygen is contained in the desalted water finally, the desalted water, the unit is supplemented into the condenser, the normal desalted water feeder, the condenser, the water supplement rate is high vacuum degree, most of dissolved oxygen can be discharged into the water, the condensed water in the condensed water, the condensed water can be controlled by a vacuum pumping device, the condensed water pump, the condensed water is controlled by the water, the water supply rate of the condensed water pump, the condensed water is controlled by the water supply unit with the water supply rate of the water supply unit with the condensed water supply rate of the water supply unit with the water supply rate of the water of the condensed water supply unit with.
Each water supply and oxygen adding unit can save about 50-80 ten thousand of water supply and oxygen adding devices, the unit needs to consume one bottle of oxygen every day, and 300 bottles of oxygen are consumed in three hundred days, and the total is 6000 yuan.
Claims (8)
1. The utility model provides a thermal power factory boiler feedwater oxygenation equipment, exports oxygenation pipeline (4) including smart processing oxygenation pipeline (3) and oxygen-eliminating device, oxygen-eliminating device export oxygenation pipeline (4) are connected to the output of oxygen-eliminating device (5), smart processing oxygenation pipeline (3) are connected to the input of oxygen-eliminating device (5), its characterized in that still includes demineralized water tank (1) of filling with oxygen-containing demineralized water and is used for importing the pressure boost of oxygen-containing demineralized water to the demineralized water pump (2) of smart processing oxygenation pipeline (3) and oxygen-eliminating device export oxygenation pipeline (4), the input and the demineralized water tank (1) of demineralized water pump (2) are connected, and the output is connected with smart processing oxygenation pipeline (3) and oxygen-eliminating device export oxygenation pipeline (4) respectively.
2. The boiler water feeding and oxygen adding equipment of the thermal power plant as recited in claim 1, wherein the fine processing oxygen adding pipeline (3) comprises a condenser (32), a condensate pump (33), a fine processing outlet (34) and a condensate pump inlet oxygen adding pipeline, the condenser (32), the condensate pump (33) and the fine processing outlet (34) are connected in sequence, the input end of the condensate pump inlet oxygen adding pipeline is connected to the output end of the desalting water pump (2), the output end of the condensate pump inlet oxygen adding pipeline is connected to the input end of the condensate pump (33), and the input end of the condenser (32) is connected to the output end of the desalting water pump (2).
3. A thermal power plant boiler feedwater oxygenation device according to claim 2, characterized in that said condensate pump inlet oxygenation line comprises a first regulating valve (36), the input of said first regulating valve (36) being connected to the output of the demineralized water pump (2), the output being connected to the input of the condensate pump (33).
4. The boiler feedwater oxygenation device of a thermal power plant according to claim 3, characterized in that a first check valve (35) is provided between the first regulating valve (36) and the demineralized water pump (2).
5. A boiler feedwater oxygenation device of a thermal power plant according to claim 3, characterized in that a second stop valve (37) is provided between the first regulating valve (36) and the condensate pump (33).
6. The boiler feedwater oxygenation device of a thermal power plant according to claim 3, characterized in that a first shut-off valve (31) is provided between the condenser (32) and the demineralized water pump (2).
7. The boiler water feeding and oxygen adding equipment of the thermal power plant as claimed in claim 4, wherein the oxygen remover outlet oxygen adding pipeline (4) comprises a second check valve (41), a third check valve (42), a booster pump (43), a second regulating valve (44) and a fourth check valve (45) which are connected in sequence, the input end of the second check valve (41) is connected to the output end of the brine removing pump (2), and the output end of the fourth check valve (45) is connected to the oxygen remover outlet oxygen adding pipeline.
8. The boiler water feeding and oxygen adding equipment of the thermal power plant as claimed in claim 6, wherein the output end of the deaerator (5) is connected to an economizer, the inlet of the deaerator (5) is provided with a first inlet dissolved oxygen sensor, and the inlet pipeline of the economizer is provided with a second inlet dissolved oxygen sensor.
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| CN110195855A (en) * | 2019-06-27 | 2019-09-03 | 中电华创(苏州)电力技术研究有限公司 | A kind of heat power plant boiler feed water oxygenation equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110195855A (en) * | 2019-06-27 | 2019-09-03 | 中电华创(苏州)电力技术研究有限公司 | A kind of heat power plant boiler feed water oxygenation equipment |
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