CN111998694B - Forced-ventilated type preposed coagulation vacuumizing method - Google Patents
Forced-ventilated type preposed coagulation vacuumizing method Download PDFInfo
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- CN111998694B CN111998694B CN202010827849.1A CN202010827849A CN111998694B CN 111998694 B CN111998694 B CN 111998694B CN 202010827849 A CN202010827849 A CN 202010827849A CN 111998694 B CN111998694 B CN 111998694B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
Abstract
The invention discloses a forced-ventilated type preposed coagulation vacuum pumping method, wherein a first gas-water outlet (1.1) arranged at the top of a condenser (1) is connected with a gas-water inlet (2.1) arranged at one side of a preposed coagulation device (2) through a pipeline, and a second gas-water outlet (2.3) arranged at the top of the preposed coagulation device (2) is connected with one end of a gas inlet pipe (3.1) arranged in a vacuum pump set (3) through a pipeline; the other end of the air inlet pipe (3.1) is connected with a vacuum pump body (3.2), and one side of the vacuum pump body (3.2) is connected with a gas-water separator (3.4) through a pipeline; the condenser overcomes the defects that a preposed condensing device in the prior art is directly connected with external atmosphere to cause air leakage risk of the condenser and the vacuum of the condenser is more difficult to maintain, and has the advantages that the air flows back to the condenser in a forced drainage mode through a drainage pump and the resource is recycled.
Description
Technical Field
The invention relates to the technical research field of energy and chemical industry, in particular to a forced-ventilated type preposed coagulation vacuumizing method.
Background
The boiler heats water into high-temperature steam, the steam is sent to a steam turbine generator to do work and generate power, and the steam after doing work is condensed into water through a condenser; the process is a typical steam-water circulation flow of the coal-fired power plant.
Wherein, the higher the steam parameter is, the lower the pressure in the condenser is, the more work is done in the whole cycle process, and the efficiency is higher. When the boiler parameters are fixed, the key for improving the power generation efficiency of the coal-fired power plant is to maintain the vacuum of the condenser.
In northwest areas of China, most coal-fired power plants operate in an indirect air cooling mode or a direct air cooling mode due to the limitation of water sources at the locations.
For direct or indirect air cooling power stations, the condenser has low cooling efficiency and low vacuum degree, and contains a large amount of non-condensable gas.
The above problems will cause an increase in overall power consumption, a waste of water resources, and a reduction in power generation efficiency, and thus an apparatus and method for solving the above problems are urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a forced-ventilated type preposed coagulation vacuumizing method.
The research shows that: the non-condensable gas forms a gas film on the surface of the pipe to inhibit the condensation of the steam, so that the heat release coefficient of the steam on the steam side is firstly sharply and greatly reduced along with the increase of the gas content ratio and then is slowly reduced. As shown in fig. 1: the steam containing non-condensable gas has heat release coefficient alpha corresponding to the proportion epsilon of the non-condensable gas a Gradually decreases. Therefore, it is a major challenge to pump out these non-condensable gases and maintain condenser vacuum in a direct or indirect air cooling unit.
The coal-fired power plant multi-purpose vacuum pump extracts noncondensable gas. The non-condensing gases are mainly air that leaks into the condenser, where a large amount of saturated steam is also mixed. Saturated steam occupies a large amount of pumping space, so that the output of a plurality of engineering vacuum pumps is insufficient, the back pressure of a unit is increased, and the generating efficiency of the steam turbine is finally influenced.
Based on this, the inventor adds a pre-coagulation device of a vacuum pump behind the condenser, so that a part of saturated steam can be condensed in advance, and the amount of dry air extracted by a vacuum-pumping system is increased. However, the pre-coagulation tank is in a vacuum state, and the coagulated liquid is difficult to discharge. If a sewage pump is additionally arranged to forcibly discharge the sewage to a sewage pit, three defects exist: 1) A large amount of condensed water can not be recovered, and the situation of water shortage in northwest areas is further increased. 2) The additional sewage pump increases the energy consumption of the whole system. 3) The direct connection of the preposed condensing device to the external atmosphere causes the risk of air leakage of the condenser, so that the vacuum of the condenser is more difficult to maintain.
The method of the invention overcomes the defects through reasonable layout.
The invention is implemented by the following technical scheme: a forced-ventilated type preposed coagulation vacuumizing method comprises a forced-ventilated type preposed coagulation vacuumizing system, wherein the forced-ventilated type preposed coagulation vacuumizing system comprises a condenser, a preposed coagulation device, a vacuum pump set, a drainage pump, a vacuum stop valve, a U-shaped bent pipe and a condensed water structure;
a first gas-water outlet arranged at the top of the condenser is connected with a gas-water inlet arranged at one side of the pre-coagulation device through a pipeline, and a second gas-water outlet arranged at the top of the pre-coagulation device is connected with one end of a gas inlet pipe arranged in the vacuum pump set through a pipeline;
the other end of the air inlet pipe is connected with a vacuum pump body, and one side of the vacuum pump body is connected with a gas-water separator through a pipeline; the other end of the gas-water separator is connected with the plate heat exchanger through a pipeline, and return water in the plate heat exchanger is communicated with one side of the vacuum pump body through a pipeline;
the working fluid overflow port arranged at the bottom of the gas-water separator is connected with the working fluid return port arranged at the bottom of the condenser through a pipeline; the condensed liquid outlet arranged at the bottom of the pre-coagulation device is connected with the inlet of the drainage pump through a pipeline;
an outlet of the drainage pump is connected with a condensate return port arranged on the condenser through a pipeline;
the vacuum pumping method adopting the forced-ventilated type preposed coagulation vacuum pumping system comprises the following steps;
(1) opening all vacuum stop valves and keeping pipelines smooth in the first step;
(2) firstly, starting the vacuum pump set motor; starting to establish and maintain the vacuum state of the condenser, simultaneously spraying condensed water from the condensed water structure into the pre-condenser from the spraying inlet, starting to spray, and starting the drainage pump;
(3) the gas-water mixture discharged from the condenser enters a pre-condenser from the gas-water inlet to start coagulation heat exchange with the condensation water structure, the gas-water mixture after heat exchange is discharged to a vacuum pump group from the gas-water outlet, and partial condensed condensate after heat exchange returns to the condenser from the condensate outlet through the drainage pump;
(4) the gas-water mixture enters from the gas inlet pipe, is sucked from the vacuum pump body and then is discharged into the gas-water separator, the separated gas is discharged into the atmosphere from the gas outlet, and the working fluid backwater flows back to the condenser from the working fluid overflow port by means of the vacuum suction in the condenser.
In the above technical scheme: a vacuum stop valve and a U-shaped bent pipe are arranged on a pipeline between the condensed liquid outlet and the condensed liquid water return port on one side close to the condenser; and a vacuum stop valve and a U-shaped bent pipe are arranged on a pipeline between the working liquid overflow port and the water return port.
In the above technical scheme: and the outlet of the pipeline connected with each first gas-water outlet is provided with a vacuum stop valve.
In the above technical scheme: the condenser comprises a plurality of first gas-water outlets arranged at the top, a condensed liquid return port and a working liquid return port which are arranged at the bottom;
the lower part of one side of the pre-coagulation device is provided with a gas-water inlet, the upper part of the other side of the pre-coagulation device is provided with a condensed water spraying inlet, and the condensed water spraying inlet is communicated with an external condensed water system; the top of the pre-coagulation device is provided with a second gas-water outlet, and the bottom of the pre-coagulation device is provided with a coagulation liquid outlet;
the vacuum pump set is provided with an air inlet pipe, a vacuum pump body, a plate heat exchanger, a gas-water separator and a motor; the output end of the motor is connected with the vacuum pump body;
the top of the gas-water separator is provided with an exhaust port which is communicated with the atmosphere, and the bottom of the gas-water separator is provided with a working fluid overflow port.
In the above technical scheme: the condenser is arranged at the deep pit of the main plant, and the preposed mixing condenser, the vacuum pump group and the drainage pump are all arranged on the 0m layer of the main plant.
In the above technical scheme: after the gas-water mixture and the condensed water exchange heat in the pre-coagulation device, the temperature can be reduced by 5-10 ℃, the water content is reduced, and the air pumping efficiency of a subsequent vacuum pump is improved.
In the above technical scheme: and liquid after heat exchange in the pre-coagulation device flows back to the condenser in a drainage pump pressurization mode.
In the above technical scheme: and the vacuum stop valve and the U-shaped bent pipe are arranged at the end close to the condenser, of the related pipelines of the mixed condensate return water and the working liquid return water which flow back to the condenser.
The invention has the following advantages: 1. after the gas-water mixture and the condensed water exchange heat in the pre-coagulation device, the temperature is reduced, the water content is reduced, and the air pumping efficiency of a subsequent vacuum pump is improved.
2. The liquid after heat exchange in the pre-coagulation device flows back to the condenser in a forced drainage mode through the drainage pump, so that the resistance of a pipeline along the way is overcome, and the resource reutilization is realized.
3. In the invention, the working liquid backwater is also reinjected to the condenser, thereby further saving the working water.
4. In the invention, the U-shaped bent pipes are arranged at the ends, close to the condenser, of the related pipelines of the condensate return water and the working fluid return water which flow back to the condenser, and the water sealing function of the U-shaped bent pipes can prevent air from leaking into the condenser.
5. The comprehensive calculation result shows that compared with the related system of the conventional indirect or direct air cooling unit, the invention has the advantages of greatly improving the aspects of saving power consumption, improving the power generation efficiency, saving the overall operation cost and the like, and has commercially succeeded.
Drawings
FIG. 1 is a graph illustrating the effect of uncondensed gas content on the heat release coefficient of a gas-vapor mixture.
FIG. 2 is a schematic view of a forced-ventilated type pre-coagulation vacuum-pumping system according to the present invention.
Fig. 3 is a system layout diagram of the vacuum pump set of the present invention.
Fig. 4 is a schematic view of a conventional vacuum pumping system.
In the figure: the device comprises a condenser 1, a first gas-water outlet 1.1, a coagulation liquid water return port 1.2, a working liquid water return port 1.3, a pre-coagulation device 2, a gas-water inlet 2.1, a condensed water spraying inlet 2.2, a second gas-water outlet 2.3, a coagulation liquid outlet 2.4, a vacuum pump group 3, an air inlet pipe 3.1, a vacuum pump body 3.2, a heat exchanger 3.3, a gas-water separator 3.4, a motor 3.5, a drainage pump 4, a vacuum stop valve 5, a U-shaped bent pipe 6, condensed water 7, a gas-water mixture 8, a coagulation liquid water return 8.1, gas 8.2 and a working liquid water return 8.3.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, but they are not to be construed as limiting the invention, and are merely illustrative, and the advantages of the invention will be more clearly understood and appreciated by those skilled in the art.
Referring to FIGS. 2-3: a forced-ventilated type preposed coagulation vacuum pumping method comprises a condenser 1, a preposed coagulation device 2, a vacuum pump group 3, a drainage pump 4, a vacuum stop valve 5, a U-shaped bent pipe 6 and condensed water 7;
a first gas-water outlet 1.1 arranged at the top of the condenser 1 is connected with a gas-water inlet 2.1 arranged at one side of the pre-coagulation device 2 through a pipeline, and a second gas-water outlet 2.3 arranged at the top of the pre-coagulation device 2 is connected with one end of a gas inlet pipe 3.1 arranged in the vacuum pump unit 3 through a pipeline;
the other end of the air inlet pipe 3.1 is connected with a vacuum pump body 3.2, and one side of the vacuum pump body 3.2 is connected with an air-water separator 3.4 through a pipeline;
a working fluid overflow port 3.4.2 arranged at the bottom of the gas-water separator 3.4 is connected with a working fluid return port 1.3 arranged at the bottom of the condenser 1 through a pipeline; the condensed liquid outlet 2.4 arranged at the bottom of the pre-coagulation device 2 is connected with the inlet of the drainage pump 4 through a pipeline;
and an outlet of the drainage pump 4 is connected with a condensate return port 1.2 arranged on the condenser 1 through a pipeline.
A vacuum stop valve 5 and a U-shaped bent pipe 6 are arranged on a pipeline between the mixed condensate outlet 2.4 and the mixed condensate return port 1.2 on one side close to the condenser 1; a vacuum stop valve 5 and a U-shaped bent pipe 6 are also arranged on a pipeline between the working liquid overflow port 3.4.2 and the working liquid return port 1.3. The arrangement of the vacuum stop valve 5 and the U-shaped bent pipe 6 can completely prevent the gas leakage of the condensate return port 1.2 and the working liquid return port 1.3 of the condenser.
And a vacuum stop valve 5 is arranged at the outlet of the pipeline connected with each first gas-water outlet 1.1. The vacuum stop valve 5 can avoid gas leakage of the first gas-water outlet 1.1.
The condenser 1 comprises a gas-water outlet 1.1 arranged at the top, a condensed liquid return port 1.2 arranged at the bottom and a working liquid return port 1.3;
the lower part of one side of the pre-coagulation device 2 is provided with an air-water inlet 2.1, the upper part of the other side is provided with a condensed water spraying inlet 2.2, and the condensed water spraying inlet 2.2 is communicated with an external condensed water structure 7; the top of the pre-coagulation device 2 is provided with a second gas-water outlet 2.3, and the bottom of the pre-coagulation device is provided with a coagulation liquid outlet 2.4;
the vacuum pump group 3 is provided with an air inlet pipe 3.1, a vacuum pump body 3.2, a plate heat exchanger 3.3, a gas-water separator 3.4 and a motor 3.5; the output end of the motor 3.5 is connected with the vacuum pump body 3.2;
the top of the gas-water separator 3.4 is provided with an exhaust port 3.4.1, the exhaust port 3.4.1 is communicated with the atmosphere, and the bottom of the gas-water separator 3.4 is provided with a working fluid overflow port 3.4.2.
The condenser 1 is arranged at a deep pit of the main plant, and the preposed mixing condenser 2, the vacuum pump group 3 and the drainage pump 4 are all arranged on a 0-meter layer of the main plant. The condenser 1, the pre-condenser 2, the vacuum pump group 3 and the drainage pump 4 can be installed in multiple sections, so that the whole equipment is convenient to transport, hoist, overhaul and maintain.
The vacuum pumping method adopting the forced-ventilated type preposed coagulation vacuum pumping system comprises the following steps;
(1) in the first step, all the vacuum stop valves 5 are opened and the pipelines are kept smooth;
(2) firstly, starting a motor 3.5 of the vacuum pump group; starting to establish and maintain the vacuum state of the condenser 1, simultaneously spraying condensed water from the condensed water structure 7 into the pre-condenser 2 from the spraying inlet 2.2, starting to spray, and simultaneously starting the drainage pump 4;
(3) the gas-water mixture 8 discharged from the condenser 1 enters the pre-condenser 2 from the gas-water inlet 2.1 to start coagulation heat exchange with the condensation water structure 7, the gas-water mixture 8 after heat exchange is discharged to the vacuum pump group 3 from the gas-water outlet 2.3, and the partially heat-exchanged and condensed condensate return water 8.1 flows back to the condenser 1 from the condensate outlet 2.4 through the drainage pump 4;
(4) the gas-water mixture 8 enters the vacuum pump body 3.2 from the gas inlet pipe 3.1, is pumped and then is discharged into the gas-water separator 3.4, the separated gas 8.2 is discharged to the atmosphere from the gas outlet 3.4.1, and the working solution backwater 8.3 flows back to the condenser 1 from the working solution overflow port 3.4.2 by means of the vacuum suction force in the condenser 1;
referring to FIG. 2: after the gas-water mixture 8 and the condensed water 7 exchange heat in the pre-coagulation device 2, the temperature is reduced, the water content is reduced, and the air pumping efficiency of a subsequent vacuum pump is improved.
Referring to FIG. 2: the liquid after heat exchange in the pre-coagulation device 2 flows back to the condenser 1 in a forced drainage mode through the drainage pump 4, so that resource recycling is realized.
Referring to FIG. 2: and the working liquid return water 8.3 is also injected back to the condenser 1 to further save the working water.
Referring to FIG. 2: the U-shaped bent pipe 6 is arranged at the end close to the condenser and has the water sealing function of preventing air from leaking into the condenser 1, and the related pipelines of the condensate return water 8.1 and the working fluid return water 8.3 which flow back to the condenser 1 are provided with the U-shaped bent pipe 6.
Referring to FIG. 4: the conventional vacuum pumping system mostly adopts a way that a pipeline between a condenser outlet and a vacuum pump is directly connected. The water mixture 8 discharged from the condenser 1 is discharged into the vacuum pump group 3 without any treatment, the temperature is high, the moisture content is large, the vacuum pump operates in overload all the year round, the temperature of working fluid is high, and the vacuum of the system cannot be guaranteed. Meanwhile, after the gas-water mixture 8 is subjected to gas-liquid separation by the gas-water separator 3.4, the redundant working solution backwater 8.3 is directly discharged to a sewage tank from an overflow port, so that a large amount of water resource waste is caused.
The influence of the forced-air pre-coagulation vacuumizing system on the air extraction amount and the condensed water consumption of the condenser of the unit is calculated by taking a group of typical actual operation parameters of the indirect air cooling unit as an example. The specific parameters of the unit are shown in table 1:
TABLE 1 some parameters of the indirect air cooling unit
The dry air quantity is obtained by selecting an empirical value according to the condenser steam quantity according to HEI standard, and m is taken 2 ＝61.24Kg/m 3 And the air exhaust supercooling degree delta t is taken as 4.16 ℃ according to the HEI standard.
Calculating the partial pressure of steam and dry air in the steam and non-condensable gas mixture and the total volume of the steam-gas mixture under different working conditions according to the following steps:
(1) Assuming that the total pressure of the steam-gas mixture is P 0 (kPa) steam partial pressure P 1 (kPa) dry air partial pressure P 2 (kPa), and P 1 That is, the saturation corresponding to the degree of supercooling subtracted from the corresponding steam saturation temperature under the operating pressure of the condenserPressure and has P according to the law of partial pressure in daltons 0 ＝P 1 +P 2 。
(2) Assuming condenser operating pressure P 0 Lower corresponding saturated steam temperature of T 0 In the temperature range of (DEG C), the actual operating temperature T of the condenser is measured r ＝T 0 -△t(℃)
(3)P 1 Is T r Corresponding to the saturated vapor pressure, and P 0 I.e. the operating pressure of the condenser, so that the dry air partial pressure P can be determined 2 . According to the formulas 1 and 2, the volume of the mixture of steam and dry air can be obtained.
P 2 ×v 2 ＝R g ×T r (1)
m 2 ×v 2 ＝V (2)
(4) Assuming a steam mass of m 1 Saturated steam corresponds to P 1 Specific volume of steam at V 1 The steam quality m can be obtained by looking up the formula 3 according to the saturated steam table 1 。
m 1 ×v 1 ＝m 2 ×v 2 (3)
According to the calculation method, the content of dry air and steam in the extracted air and the volume of the extracted air under the design working condition, the THA working condition and the summer working condition are calculated, and the calculation result is shown in the table 2.
TABLE 2 calculation results
Taking the indirect air cooling unit as an example, for a conventional condensation vacuum system, the pumping volume of the vacuum pump is 3681m 3 The volume of the air to be drained is 61.24kg/h, and the iterative calculation can obtain: when P is present 0 Δ t =3.03088 ℃ when =10.3 kPa. When P is present 0 Δ t =1.36135 ℃ when =26.9 kPa.
Considering the flow Dw =10000kg/h and the cooling water temperature Tw =20 ℃, when P is 0 If =7.3KPa, the exhaust mass flow q 0 =212.12kg/h, mass flow q of steam brought by air extraction 1 ＝150.88kg/h, after heat exchange with condensed water, the temperature of air extraction is calculated according to Newton's cooling theorem analysis 1 Reduction of =35.62 ℃ to t 2 =33.41 ℃, corresponding saturated steam pressure is 5.153kPa, and the steam is condensed into water mass flow q after mixing and condensation 2 =123.44kg/h, so the mass flow q of the cooling water after cooling by the pre-steam cooler 3 =10123.44kg/h. The annual operating cost of the part of cooling water is about 49.2 ten thousand yuan when the part of cooling water is operated for 5400 hours per year. If the sewage pump is additionally arranged, the power is 1.5kW and is selected according to the lift of 20m, the operation power consumption is increased by 8100kJ, and the cost including the sewage pump is about 15 ten thousand yuan. Return flow q of working fluid 4 =22626kg/h, annual operating costs of about 109.9 ten thousand yuan. So when P is 0 And when the pressure vessel is 7.3KPa, the water operation cost of a condenser vacuumizing system is about 174.1 ten thousand yuan, and the power consumption is increased by 8100kJ after a sewage pump is additionally arranged. Similarly, it is calculated according to the same method, when P 0 When the pressure is =10.3kPa, the water operating cost of a condenser vacuumizing system is about 245.6 ten thousand yuan, and the power consumption is increased by 11421kJ after a sewage pump is additionally arranged; when P is present 0 When the pressure is not less than 26.9kPa, the water operating cost of a condenser vacuum pumping system is about 641.5 ten thousand yuan, and the power consumption is increased by 42086kJ after a sewage pump is additionally arranged.
After the forced-ventilated type preposed coagulation vacuum-pumping system is adopted, condensed water in the preposed cooler 2 is mixed with cooling water and then forcibly discharged into the condenser 1 to form recycling, and working solution return water 8.3 flows back into the condenser 1 to form recycling, so that a large amount of extra water is saved by recycling of the two cooling water amounts, and the situation of water shortage in northwest regions is better dealt with. The cost and power consumption of the present invention are reduced compared to conventional units as shown in table 3.
Table 3 operating costs and power consumption of the inventive vacuum pumping system as compared to conventional units
The calculation result shows that compared with the related system of the conventional indirect air cooling unit, the forced-ventilated type preposed coagulation vacuumizing system disclosed by the invention has the advantages that the power consumption is saved, the operation cost is reduced and the like.
The above-mentioned parts which are not described in detail are prior art.
Claims (6)
1. A forced-ventilated type preposed coagulation vacuumizing method is characterized in that: the system comprises a forced-ventilated type prepositive coagulation vacuumizing system, wherein the forced-ventilated type prepositive coagulation vacuumizing system comprises a condenser (1), a prepositive coagulation device (2), a vacuum pump group (3), a draining pump (4), a vacuum stop valve (5), a U-shaped bent pipe (6) and a condensed water structure (7);
a first gas-water outlet (1.1) arranged at the top of the condenser (1) is connected with a gas-water inlet (2.1) arranged at one side of the pre-coagulation device (2) through a pipeline, and a second gas-water outlet (2.3) arranged at the top of the pre-coagulation device (2) is connected with one end of a gas inlet pipe (3.1) arranged in the vacuum pump set (3) through a pipeline;
the other end of the air inlet pipe (3.1) is connected with a vacuum pump body (3.2), and one side of the vacuum pump body (3.2) is connected with a gas-water separator (3.4) through a pipeline; the other end of the gas-water separator (3.4) is connected with the plate heat exchanger (3.3) through a pipeline, and the return water in the plate heat exchanger (3.3) is communicated with one side of the vacuum pump body (3.2) through a pipeline;
a working liquid overflow port (3.4.2) arranged at the bottom of the gas-water separator (3.4) is connected with a working liquid return port (1.3) arranged at the bottom of the condenser (1) through a pipeline; a coagulating liquid outlet (2.4) arranged at the bottom of the pre-coagulation device (2) is connected with an inlet of a drainage pump (4) through a pipeline;
an outlet of the drainage pump (4) is connected with a condensate return port (1.2) arranged on the condenser (1) through a pipeline;
the forced-ventilated type preposed coagulation vacuumizing method comprises the following steps of;
(1) firstly, opening all vacuum stop valves (5) and keeping pipelines smooth;
(2) firstly, starting the vacuum pump set motor (3.5); starting to establish and maintain the vacuum state of the condenser (1), simultaneously spraying condensed water from the condensed water structure (7) into the pre-condenser (2) from the spraying inlet (2.2) and starting to spray, and simultaneously starting the drainage pump (4);
(3) the gas-water mixture (8) discharged from the condenser (1) enters the pre-condenser (2) from the gas-water inlet (2.1) to start coagulation heat exchange with the condensation water structure (7), the gas-water mixture (8) after heat exchange is discharged to the vacuum pump group (3) from the gas-water outlet (2.3), and the partially heat-exchanged and condensed condensate return water (8.1) flows back to the condenser (1) from the condensate outlet (2.4) through the drainage pump (4);
(4) the gas-water mixture (8) enters from the gas inlet pipe (3.1) and is pumped from the vacuum pump body (3.2) and then is discharged into the gas-water separator (3.4), the separated gas (8.2) is discharged to the atmosphere from the gas outlet (3.4.1), and the working fluid backwater (8.3) flows back to the condenser (1) from the working fluid overflow port (3.4.2) by means of the vacuum suction force in the condenser (1); a vacuum stop valve (5) and a U-shaped bent pipe (6) are arranged on a pipeline between the mixed condensate outlet (2.4) and the mixed condensate return port (1.2) on one side close to the condenser (1); a vacuum stop valve (5) and a U-shaped bent pipe (6) are arranged on a pipeline between the working liquid overflow port (3.4.2) and the water return port (1.3); a vacuum stop valve (5) is arranged at the outlet of the pipeline connected with each first gas-water outlet (1.1);
the liquid after heat exchange in the pre-condenser (2) flows back to the condenser (1) in a manner of forced drainage by a drainage pump (4).
2. The forced-ventilated type front-mounted coagulation vacuumizing method according to claim 1, wherein the forced-ventilated type front-mounted coagulation vacuumizing method comprises the following steps: the condenser (1) comprises a plurality of first gas-water outlets (1.1) arranged at the top, a mixed condensate water return port (1.2) arranged at the bottom and a working liquid water return port (1.3);
the lower part of one side of the pre-coagulation device (2) is provided with a gas-water inlet (2.1), the upper part of the other side is provided with a condensed water spraying inlet (2.2), and the condensed water spraying inlet (2.2) is communicated with an external condensed water system (7); a second gas-water outlet (2.3) is arranged at the top of the pre-coagulation device (2), and a coagulation liquid outlet (2.4) is arranged at the bottom of the pre-coagulation device;
the vacuum pump set (3) is provided with an air inlet pipe (3.1), a vacuum pump body (3.2), a plate heat exchanger (3.3), a gas-water separator (3.4) and a motor (3.5); the output end of the motor (3.5) is connected with the vacuum pump body (3.2);
the top of the gas-water separator (3.4) is provided with an exhaust port (3.4.1), the exhaust port (3.4.1) is communicated with the atmosphere, and the bottom of the gas-water separator (3.4) is provided with a working fluid overflow port (3.4.2).
3. The forced-ventilated type front-mounted coagulation vacuumizing method according to claim 1, wherein the forced-ventilated type front-mounted coagulation vacuumizing method comprises the following steps: the condenser (1) is arranged at a deep pit of a main plant, and the preposed coagulation device (2), the vacuum pump set (3) and the drainage pump (4) are all arranged on a 0-meter layer of the main plant.
4. The forced-ventilated type preposed coagulation vacuumizing method according to claim 1, characterized in that: after the gas-water mixture (8) and the condensed water (7) exchange heat in the pre-coagulation device (2), the temperature can be reduced by 5-10 ℃, the water content is reduced, and the air pumping efficiency of a subsequent vacuum pump is improved.
5. The forced-ventilated type front-mounted coagulation vacuumizing method according to claim 1, wherein the forced-ventilated type front-mounted coagulation vacuumizing method comprises the following steps: liquid after heat exchange in the pre-condenser (2) flows back to the condenser (1) in a manner of pressurization by the drainage pump (4).
6. The forced-ventilated type front-mounted coagulation vacuumizing method according to claim 1, wherein the forced-ventilated type front-mounted coagulation vacuumizing method comprises the following steps: and a vacuum stop valve (5) and a U-shaped bent pipe (6) are arranged at the end, close to the condenser, of a related pipeline of the condensate return water (8.1) and the working solution return water (8.3) which return to the condenser (1).
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| HU225331B1 (en) * | 2003-04-24 | 2006-09-28 | Egi Energiagazdalkodasi Reszve | Air cooler system |
| CN202675930U (en) * | 2012-07-13 | 2013-01-16 | 大唐七台河发电有限责任公司 | Steam condenser vacuumizing cooling device |
| CN107062934B (en) * | 2017-05-15 | 2022-11-25 | 华电电力科学研究院有限公司 | Energy-saving vacuumizing cooling system and method |
| CN110715561A (en) * | 2019-11-14 | 2020-01-21 | 西安热工研究院有限公司 | Water ring vacuum pump system based on front condensation type steam-gas separation device |
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