CN113701142A - Tubular heat exchanger heat medium water waste heat heating condensate system and control method - Google Patents
Tubular heat exchanger heat medium water waste heat heating condensate system and control method Download PDFInfo
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- CN113701142A CN113701142A CN202110973552.0A CN202110973552A CN113701142A CN 113701142 A CN113701142 A CN 113701142A CN 202110973552 A CN202110973552 A CN 202110973552A CN 113701142 A CN113701142 A CN 113701142A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 473
- 238000010438 heat treatment Methods 0.000 title claims abstract description 76
- 239000002918 waste heat Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims description 13
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 26
- 239000003245 coal Substances 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 15
- 230000001276 controlling effect Effects 0.000 claims description 13
- 230000000694 effects Effects 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract description 2
- 239000002609 medium Substances 0.000 description 79
- 238000009833 condensation Methods 0.000 description 22
- 230000005494 condensation Effects 0.000 description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/34—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines and returning condensate to boiler with main feed supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Water Supply & Treatment (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a tubular heat exchanger heat medium water waste heat heating condensed water system, which comprises a heat medium water pipe, a condensed water pipe, a steam drain pipe, a temperature-reducing water pipe, a condensed water heat medium water heat exchanger, a condensed water steam drain heat exchanger, a steam temperature-reducing pressure-reducing device and a steam drain tank, wherein the heat medium water pipe is connected with the condensed water pipe; the condensed water is connected to the condensed water pipe at the inlet of the condensed water medium water heat exchanger, the hot coal water is connected to the hot medium water pipe at the inlet of the condensed water medium water heat exchanger, and the hot medium water pipe at the outlet of the condensed water medium water heat exchanger is connected to the hot coal water return pipeline. The invention has the beneficial effects that: the invention adopts the three-stage heat exchange of the condensed water heat medium water heat exchanger, the condensed water steam heat exchanger and the condensed water steam hydrophobic heat exchanger, heats the condensed water through the waste heat of the heat medium water of the tubular heat exchanger and the auxiliary steam, and generates the condensed water with the optimal temperature, thereby reducing the air extraction quantity of the steam turbine, improving the generating efficiency of the unit, realizing the recovery of the waste heat of the heat medium water, and achieving the energy-saving effect.
Description
Technical Field
The invention relates to the technical field of coal-fired units, in particular to a system for heating a condensate by utilizing waste heat of heating medium water of a tubular heat exchanger and a control mode.
Background
The tubular heat exchanger is a main way for solving the adverse effect of high-temperature flue gas emission on power plant equipment and the surrounding environment, and is an effective means for improving the dust removal efficiency. The tubular heat exchanger passes through heat medium aqueous medium, absorbs high temperature flue gas heat at the electrostatic precipitator front end, reduces the gas temperature, improves dust collection efficiency, passes through the release heat medium aqueous heat at the chimney entry, promotes the gas temperature, improves the flue gas emission height. At present, the heat of the flue gas before electric precipitation is not fully utilized, the heat medium water of the tubular heat exchanger only absorbs part of heat, and most of the heat medium water passes through a bypass and does not participate in the heat absorption of the flue gas.
In summary, it is needed to provide a heat medium waste heat recovery system for a tubular heat exchanger to solve the problem of waste of heat of flue gas before electric precipitation.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a tubular heat exchanger heat medium waste heat heating condensed water system and a control method.
The pipe type heat exchanger heat medium water waste heat heating condensed water system comprises a heat medium water pipe, a condensed water pipe, a steam drain pipe, a temperature reduction water pipe, a condensed water heat medium water heat exchanger, a condensed water steam drain heat exchanger, a steam temperature reduction and pressure reduction device and a steam drain tank; the condensed water is connected to a condensed water pipe at the inlet of a condensed water medium water heat exchanger, the hot coal water is connected to a hot medium water pipe at the inlet of the condensed water medium water heat exchanger, and a hot medium water pipe at the outlet of the condensed water medium water heat exchanger is connected to a hot coal water return pipeline; the condensed water pipe at the outlet of the condensed water medium water heat exchanger is divided into two paths, one path is connected with the condensed water pipe at the inlet of the condensed water steam heat exchanger, the other path is connected with the condensed water pipe at the inlet of the condensed water steam hydrophobic heat exchanger, and the condensed water pipes at the outlets of the condensed water steam heat exchanger and the condensed water steam hydrophobic heat exchanger are gathered and connected into a condensed water return pipeline; the steam pipe is provided with a steam temperature and pressure reducing device, the steam pipe at the outlet of the steam temperature and pressure reducing device is connected to the inlet of the condensed water steam heat exchanger, and the steam drain pipe at the outlet of the condensed water steam heat exchanger is connected to the inlet of the condensed water steam drain heat exchanger; the steam trap pipe of the outlet of the condensed water steam trap heat exchanger is connected to the inlet of the steam trap tank, the temperature-reducing water pump is arranged on the temperature-reducing water pipe of the outlet of the steam trap tank, and the outlet of the temperature-reducing water pump is connected to the inlet of the steam temperature-reducing and pressure-reducing device.
Preferably, the method comprises the following steps: the heat medium water pipe at the inlet of the condensed water heat medium water heat exchanger is provided with a heat medium water pipe regulating valve at the inlet of the condensed water heat medium water heat exchanger, and the condensed water pipe at the outlet of the condensed water heat medium water heat exchanger is provided with a condensed water heat pipe thermal resistor at the outlet of the condensed water heat medium water heat exchanger.
Preferably, the method comprises the following steps: and a condensed water pipe thermal resistor at the outlet of the condensed water steam heat exchanger is arranged on a condensed water pipe at the outlet of the condensed water steam heat exchanger.
Preferably, the method comprises the following steps: the condensed water pipe at the inlet of the condensed water steam hydrophobic heat exchanger is provided with a condensed water pipe regulating valve at the inlet of the condensed water steam hydrophobic heat exchanger, and the steam hydrophobic pipe at the outlet of the condensed water steam hydrophobic heat exchanger is provided with a thermal resistor at the outlet of the condensed water steam hydrophobic heat exchanger.
Preferably, the method comprises the following steps: the inlet of the steam temperature and pressure reducing device is provided with an inlet regulating valve of the steam temperature and pressure reducing device, and the outlet of the steam temperature and pressure reducing device is provided with an outlet thermal resistor of the steam temperature and pressure reducing device.
Preferably, the method comprises the following steps: the steam trap pipe at the inlet of the steam trap is provided with a water replenishing switch valve of the steam trap, the steam trap is provided with a liquid level meter of the steam trap, and the outlet of the desuperheating water pump at the outlet of the steam trap is provided with a desuperheating water pump outlet regulating valve.
The control method of the pipe heat exchanger heating medium waste heat heating condensed water system comprises the following steps:
s1, a PID control loop is formed by a thermal resistor of a condensed water heating medium water heat exchanger outlet condensed water pipe and a condensed water heating medium water heat exchanger inlet heating medium water pipe regulating valve, and the control of the condensed water heating medium water heat exchanger outlet condensed water temperature is realized by controlling the opening degree of the condensed water heating medium water heat exchanger inlet heating medium water pipe regulating valve; after the preset value of the temperature of the condensed water at the outlet of the condensed water heating medium water heat exchanger is input, the PID controller controls the flow of the heat medium water at the inlet of the condensed water heating medium water heat exchanger so as to control the temperature of the condensed water at the outlet of the condensed water heating medium water heat exchanger, and the temperature of the condensed water at the outlet of the condensed water heating medium water heat exchanger is displayed through the thermal resistor of the condensed water heating medium water heat exchanger;
s2, a PID control loop is formed by a thermal resistor of a condensed water pipe at the outlet of the condensed water steam heat exchanger and an inlet regulating valve of the steam temperature and pressure reducing device, and the temperature of condensed water at the outlet of the condensed water steam heat exchanger is controlled by controlling the opening of the inlet regulating valve of the steam temperature and pressure reducing device; after the preset temperature value of the condensed water at the outlet of the condensed water steam heat exchanger is input, the steam flow is controlled by the PID controller, so that the temperature of the condensed water at the outlet of the condensed water steam heat exchanger is controlled, and the current temperature of the condensed water at the outlet of the condensed water steam heat exchanger is displayed through a thermal resistor of a condensed water pipe at the outlet of the condensed water steam heat exchanger;
s3, the temperature of a thermal resistor of a steam drain pipe at the outlet of the condensed water steam heat exchanger and a condensed water pipe regulating valve at the inlet of the condensed water steam heat exchanger form a PID control loop, and the control of the steam drain temperature at the outlet of the condensed water steam heat exchanger is realized by controlling the opening of the condensed water pipe regulating valve at the inlet of the condensed water steam heat exchanger; after the preset steam drainage temperature value at the outlet of the condensed water steam drainage heat exchanger is input, the PID controller controls the inflow of the condensed water steam drainage heat exchanger, so that the steam drainage temperature at the outlet of the condensed water steam drainage heat exchanger is controlled, and the current steam drainage temperature at the outlet of the condensed water steam drainage heat exchanger is displayed through the thermal resistance of the steam drainage pipe at the outlet of the condensed water steam drainage heat exchanger.
Preferably, the method also comprises the following steps of controlling the temperature of steam at the outlet of the steam temperature and pressure reducing device: the thermal resistance at the outlet of the steam temperature and pressure reducing device and the outlet regulating valve of the temperature reducing water pump form a PID control loop, and the temperature control of the steam at the outlet of the steam temperature and pressure reducing device is realized by controlling the opening of the outlet regulating valve of the temperature reducing water pump; after the steam temperature value at the outlet of the steam temperature and pressure reducing device is input in advance, the PID controller controls the inflow of the temperature reducing water, so that the steam temperature at the outlet of the steam temperature and pressure reducing device is controlled, and the current steam temperature at the outlet of the steam temperature and pressure reducing device is displayed through the thermal resistance at the outlet of the steam temperature and pressure reducing device.
Preferably, the control of the liquid level of the steam trap tank is also included: when the liquid level meter of the steam trap tank displays a low liquid level, a water replenishing switch valve of the steam trap tank is opened; when the steam drain tank liquid level meter displays a high liquid level, the water replenishing switch valve of the steam drain tank is closed.
The invention has the beneficial effects that: the invention adopts the three-stage heat exchange of the condensed water heat medium water heat exchanger, the condensed water steam heat exchanger and the condensed water steam hydrophobic heat exchanger, heats the condensed water through the waste heat of the heat medium water of the tubular heat exchanger and the auxiliary steam, and generates the condensed water with the optimal temperature, thereby reducing the air extraction quantity of the steam turbine, improving the generating efficiency of the unit, realizing the recovery of the waste heat of the heat medium water, and achieving the energy-saving effect.
Drawings
FIG. 1 is a schematic diagram of a system for heating a condensate by waste heat of a heating medium water in a tubular heat exchanger according to a first embodiment;
fig. 2 is a schematic view of the control of the regulator valve according to the third embodiment.
Description of reference numerals: a heat medium water pipe 1, a condensation water pipe 2, a steam pipe 3, a steam trap 4, a desuperheating water pipe 5, a condensation water heat medium water heat exchanger 11, a condensation water steam heat exchanger 12, a condensation water steam heat exchanger 13, a steam desuperheating and depressurizing device 14, a steam trap 15, a desuperheating water pump 16, a condensation water heat medium water heat exchanger inlet heat medium water pipe regulating valve 21, a steam desuperheating and depressurizing device inlet regulating valve 22, a condensation water steam heat exchanger inlet condensation water pipe regulating valve 23, a desuperheating water pump outlet regulating valve 24, a steam trap water replenishing switch valve 25, a condensation water heat medium water heat exchanger outlet condensation water pipe thermal resistor 31, a condensation water steam heat exchanger outlet condensation water pipe thermal resistor 32, a steam desuperheating and depressurizing device outlet thermal resistor 33, a condensation water steam heat exchanger outlet steam trap thermal resistor 34 and a steam trap liquid level meter 35.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
The embodiment of the application provides a tubular heat exchanger heat medium water waste heat heating condensate system, includes: a heating medium water pipe 1, a condensation water pipe 2, a steam pipe 3, a steam drain pipe 4, a temperature-reducing water pipe 5, a condensation water heating medium water heat exchanger 11, a condensation water steam heat exchanger 12, a condensation water steam heat exchanger 13, a steam temperature-reducing pressure-reducing device 14 and a steam drain tank 15; the incoming water of the condensed water is connected to a condensed water pipe 2 at the inlet of a condensed water medium water heat exchanger 11, the incoming water of the hot coal water is connected to a hot medium water pipe 1 at the inlet of the condensed water medium water heat exchanger 11, and the hot medium water pipe 1 at the outlet of the condensed water medium water heat exchanger 11 is connected to the hot coal water backwater; the condensed water pipe 2 at the outlet of the condensed water heating medium water heat exchanger 11 is divided into two paths, one path is connected with the condensed water pipe 2 at the inlet of the condensed water steam heat exchanger 12, the other path is connected with the condensed water pipe 2 at the inlet of the condensed water steam hydrophobic heat exchanger 13, and the condensed water steam heat exchanger 12 and the condensed water pipe 2 at the outlet of the condensed water steam hydrophobic heat exchanger 13 are gathered and connected into a condensed water return pipeline; the steam pipe 3 is provided with a steam temperature and pressure reducing device 14, the steam pipe 3 at the outlet of the steam temperature and pressure reducing device 14 is connected to the inlet of the condensed water steam heat exchanger 12, and the steam drain pipe 4 at the outlet of the condensed water steam heat exchanger 12 is connected to the inlet of the condensed water steam drain heat exchanger 13; the steam trap 4 at the outlet of the condensed water steam trap heat exchanger 13 is connected to the inlet of the steam trap tank 15, the temperature-reducing water pump 16 is arranged on the temperature-reducing water pipe 5 at the outlet of the steam trap tank 15, and the outlet of the temperature-reducing water pump 16 is connected to the inlet of the steam temperature-reducing and pressure-reducing device 14.
The heat medium water pipe 1 and the condensed water pipe 2 exchange heat through the condensed water heat medium water heat exchanger 11, the heat medium water pipe 1 at the inlet of the condensed water heat medium water heat exchanger 11 is provided with a condensed water heat medium water heat exchanger inlet heat medium water pipe regulating valve 21, and the condensed water heat pipe 2 at the outlet of the condensed water heat medium water heat exchanger 11 is provided with a condensed water heat pipe thermal resistor 31 at the outlet of the condensed water heat medium water heat exchanger.
The condensed water pipe 2 and the steam pipe 3 exchange heat through the condensed water steam heat exchanger 12, and a condensed water pipe thermal resistor 32 at the outlet of the condensed water steam heat exchanger is arranged on the condensed water pipe 2 at the outlet of the condensed water steam heat exchanger 12.
The condensed water pipe 2 and the steam drain pipe 4 exchange heat through the condensed water steam heat exchanger 13, the condensed water pipe 2 at the inlet of the condensed water steam heat exchanger 13 is provided with a condensed water steam heat exchanger inlet condensed water pipe regulating valve 23, and the steam drain pipe 4 at the outlet of the condensed water steam heat exchanger 13 is provided with a condensed water steam heat exchanger outlet steam drain pipe thermal resistor 34.
The inlet of the steam temperature and pressure reducing device 14 is provided with a steam temperature and pressure reducing device inlet adjusting valve 22, and the outlet of the steam temperature and pressure reducing device 14 is provided with a steam temperature and pressure reducing device outlet thermal resistor 33.
The water replenishing pipe (namely the steam drain pipe 4 at the inlet) of the steam drain tank 15 is provided with a water replenishing switch valve 25 of the steam drain tank, the steam drain tank 15 is provided with a liquid level meter 35 of the steam drain tank, and the outlet of the desuperheating water pump 16 at the outlet of the steam drain tank 15 is provided with a desuperheating water pump outlet regulating valve 24.
Example two
The working principle of the tubular heat exchanger heating medium water waste heat heating condensed water system is as follows:
condensed water from a factory is connected to a condensed water inlet pipeline of a condensed water heat exchanger 11, after heat exchange with heat medium water, a condensed water outlet pipeline of the condensed water heat exchanger 11 is divided into two paths, one path is connected with a condensed water inlet pipeline of a condensed water steam heat exchanger 12, the other path is connected with a condensed water inlet pipeline of a condensed water steam hydrophobic heat exchanger 13, and after heat exchange, the condensed water steam heat exchanger 12 and the condensed water outlet pipeline of the condensed water steam hydrophobic heat exchanger 13 are converged and then connected to a condensed water return pipeline. Steam is connected to a steam inlet pipeline of a condensate steam heat exchanger 12 after being subjected to temperature and pressure reduction through a steam temperature and pressure reduction device 14, after the steam exchanges heat with condensate, steam trap is connected to a steam trap inlet pipeline of a condensate steam trap heat exchanger 13, after the steam trap exchanges heat with the condensate, steam condensate is discharged outside, and when the liquid level of a steam trap tank 15 is low, a steam trap tank water replenishing switch valve 25 is opened to replenish water.
Under the design condition, the condensed water heating medium water heat exchanger system and the original tubular heat exchanger heating medium circulating water are operated in parallel. About 40% of heat medium water enters the flue gas heater of the tubular heat exchanger to increase the temperature of clean flue gas and is discharged, the rest 60% of heat medium water passes through the condensed water heat medium water heat exchanger 11 to reduce the temperature of the heat medium water to about 70 ℃, and the temperature of the condensed water rises to the design temperature.
Superheated steam from the unit heats condensed water at the outlet of the condensed water heating medium water heat exchanger 11 through the condensed water steam heat exchanger 12, and the steam condensed water is discharged to the steam drain tank 15 or the condensed water tank after further recovering heat through the condensed water steam drain heat exchanger 13. The temperature of the condensed water reaches the required temperature by heating the hot steam and recovering the waste heat of the steam condensed water. In order to ensure the heat exchange effect of the condensed water vapor heat exchanger 12, a set of steam temperature and pressure reducing device 14 is arranged, and superheated steam enters the condensed water vapor heat exchanger 12 after being subjected to temperature and pressure reduction.
EXAMPLE III
The third embodiment of the application provides a control mode of tubular heat exchanger heat medium water waste heat heating condensate system, includes following step:
s1, the temperature of the outlet condensation water pipe thermal resistor 31 of the condensation water heating medium water heat exchanger and the inlet heating medium water pipe regulating valve 21 of the condensation water heating medium water heat exchanger form a PID control loop, and the outlet condensation water temperature of the condensation water heating medium water heat exchanger 11 is controlled by controlling the opening degree of the inlet heating medium water pipe regulating valve 21 of the condensation water heating medium water heat exchanger. After the preset value of the temperature of the condensed water at the outlet of the condensed water heat exchanger 11 is input, the PID controller controls the flow of the heat medium water at the inlet of the condensed water heat exchanger, so as to control the temperature of the condensed water at the outlet of the condensed water heat exchanger 11, and the temperature of the condensed water at the outlet of the condensed water heat exchanger 11 is displayed through the thermal resistor 31 of the condensed water heat exchanger outlet condensed water pipe.
S2, the temperature of the thermal resistor 32 of the condensed water pipe at the outlet of the condensed water steam heat exchanger and the inlet regulating valve 22 of the steam temperature and pressure reducing device form a PID control loop, and the temperature of the condensed water at the outlet of the condensed water steam heat exchanger 12 is controlled by controlling the opening degree of the inlet regulating valve 22 of the steam temperature and pressure reducing device. After the preset temperature value of the condensed water at the outlet of the condensed water steam heat exchanger 12 is input, the PID controller controls the steam flow, further controls the temperature of the condensed water at the outlet of the condensed water steam heat exchanger 12, and displays the current temperature of the condensed water at the outlet of the condensed water steam heat exchanger 12 through the thermal resistor 32 of the condensed water pipe at the outlet of the condensed water steam heat exchanger.
S3, the temperature of the steam drain pipe thermal resistor 34 at the outlet of the condensed water steam heat exchanger and the condensed water pipe regulating valve 23 at the inlet of the condensed water steam heat exchanger form a PID control loop, and the control of the outlet steam drain temperature of the condensed water steam heat exchanger 13 is realized by controlling the opening degree of the condensed water pipe regulating valve 23 at the inlet of the condensed water steam heat exchanger. After the preset steam drainage temperature value at the outlet of the condensed water steam hydrophobic heat exchanger 13 is input, the PID controller controls the inflow of the condensed water steam hydrophobic heat exchanger 13, further controls the steam drainage temperature at the outlet of the condensed water steam hydrophobic heat exchanger 13, and displays the current steam drainage temperature at the outlet of the condensed water steam hydrophobic heat exchanger 13 through the steam drainage pipe thermal resistor 34 at the outlet of the condensed water steam hydrophobic heat exchanger.
The temperature of the thermal resistor 33 at the outlet of the steam temperature and pressure reducing device and the outlet regulating valve 24 of the temperature reducing water pump form a PID control loop, and the temperature of the steam at the outlet of the steam temperature and pressure reducing device 14 is controlled by controlling the opening of the outlet regulating valve 24 of the temperature reducing water pump. After the preset steam temperature value at the outlet of the steam temperature and pressure reducing device 14 is input, the PID controller controls the inflow of the temperature reducing water, so as to control the steam temperature at the outlet of the steam temperature and pressure reducing device 14, and the current steam temperature at the outlet of the steam temperature and pressure reducing device 14 is displayed through the thermal resistor 33 at the outlet of the steam temperature and pressure reducing device.
When the steam drain tank liquid level meter 35 displays a low liquid level, the water replenishing switch valve 25 of the steam drain tank is opened; when the steam trap level meter 35 indicates a high level, the steam trap water replenishment on-off valve 25 is closed.
Claims (9)
1. The utility model provides a tubular heat exchanger heat medium water waste heat heating condensate system which characterized in that: comprises a heating medium water pipe (1), a condensed water pipe (2), a steam pipe (3), a steam drain pipe (4), a desuperheating water pipe (5), a condensed water heating medium water heat exchanger (11), a condensed water steam heat exchanger (12), a condensed water steam drain heat exchanger (13), a steam desuperheating and pressure reducing device (14) and a steam drain tank (15); the condensed water is connected to a condensed water pipe (2) at the inlet of a condensed water heating medium water heat exchanger (11), the hot coal water is connected to a heating medium water pipe (1) at the inlet of the condensed water heating medium water heat exchanger (11), and the heating medium water pipe (1) at the outlet of the condensed water heating medium water heat exchanger (11) is connected to a hot coal water return pipeline; a condensed water pipe (2) at the outlet of the condensed water heating medium water heat exchanger (11) is divided into two paths, one path is connected with the condensed water pipe (2) at the inlet of the condensed water steam heat exchanger (12), the other path is connected with the condensed water pipe (2) at the inlet of the condensed water steam hydrophobic heat exchanger (13), and the condensed water steam heat exchanger (12) and the condensed water pipe (2) at the outlet of the condensed water steam hydrophobic heat exchanger (13) are gathered and connected into a condensed water return pipeline; the steam pipe (3) is provided with a steam temperature and pressure reducing device (14), the steam pipe (3) at the outlet of the steam temperature and pressure reducing device (14) is connected to the inlet of the condensed water steam heat exchanger (12), and the steam drain pipe (4) at the outlet of the condensed water steam heat exchanger (12) is connected to the inlet of the condensed water steam drain heat exchanger (13); the steam trap pipe (4) at the outlet of the condensed water steam trap heat exchanger (13) is connected to the inlet of the steam trap tank (15), the temperature-reducing water pump (16) is arranged on the temperature-reducing water pipe (5) at the outlet of the steam trap tank (15), and the outlet of the temperature-reducing water pump (16) is connected to the inlet of the steam temperature-reducing and pressure-reducing device (14).
2. The tubular heat exchanger hot medium water waste heat heating condensate system according to claim 1, characterized in that: a heating medium water pipe (1) at the inlet of the condensed water heating medium water heat exchanger (11) is provided with a heating medium water pipe regulating valve (21) at the inlet of the condensed water heating medium water heat exchanger, and a condensed water pipe (2) at the outlet of the condensed water heating medium water heat exchanger (11) is provided with a condensed water heating pipe thermal resistor (31) at the outlet of the condensed water heating medium water heat exchanger.
3. The tubular heat exchanger hot medium water waste heat heating condensate system according to claim 1, characterized in that: a condensed water pipe thermal resistor (32) at the outlet of the condensed water steam heat exchanger is arranged on the condensed water pipe (2) at the outlet of the condensed water steam heat exchanger (12).
4. The tubular heat exchanger hot medium water waste heat heating condensate system according to claim 1, characterized in that: a condensed water pipe adjusting valve (23) at the inlet of the condensed water steam hydrophobic heat exchanger is arranged on a condensed water pipe (2) at the inlet of the condensed water steam hydrophobic heat exchanger (13), and a steam hydrophobic pipe thermal resistor (34) at the outlet of the condensed water steam hydrophobic heat exchanger is arranged on a steam hydrophobic pipe (4) at the outlet of the condensed water steam hydrophobic heat exchanger (13).
5. The tubular heat exchanger hot medium water waste heat heating condensate system according to claim 1, characterized in that: the inlet of the steam temperature and pressure reducing device (14) is provided with a steam temperature and pressure reducing device inlet regulating valve (22), and the outlet of the steam temperature and pressure reducing device (14) is provided with a steam temperature and pressure reducing device outlet thermal resistor (33).
6. The tubular heat exchanger hot medium water waste heat heating condensate system according to claim 1, characterized in that: a steam drain pipe (4) at the inlet of a steam drain tank (15) is provided with a steam drain tank water replenishing switch valve (25), the steam drain tank (15) is provided with a steam drain tank liquid level meter (35), and the outlet of a temperature reduction water pump (16) at the outlet of the steam drain tank (15) is provided with a temperature reduction water pump outlet regulating valve (24).
7. A control method for a pipe heat exchanger hot medium waste heat heating condensate system according to claim 1, characterized by comprising the following steps:
s1, a thermal resistor (31) of a condensed water heating medium water heat exchanger outlet condensed water pipe and a condensed water heating medium water heat exchanger inlet heating medium water pipe regulating valve (21) form a PID control loop, and the opening of the condensed water heating medium water heat exchanger inlet heating medium water pipe regulating valve (21) is controlled to realize the control of the condensed water heating medium water heat exchanger (11) outlet condensed water temperature; after the preset temperature value of the condensed water at the outlet of the condensed water heating medium water exchanger (11) is input, the PID controller controls the flow of the heat medium water at the inlet of the condensed water heating medium water exchanger, so as to control the temperature of the condensed water at the outlet of the condensed water heating medium water exchanger (11), and the temperature of the condensed water at the outlet of the condensed water heating medium water exchanger (11) is displayed through a heat resistor (31) of the condensed water heating medium water exchanger outlet condensed water pipe;
s2, a thermal resistor (32) of a condensed water pipe at the outlet of the condensed water steam heat exchanger and an inlet regulating valve (22) of the steam temperature and pressure reducing device form a PID control loop, and the temperature of condensed water at the outlet of the condensed water steam heat exchanger (12) is controlled by controlling the opening of the inlet regulating valve (22) of the steam temperature and pressure reducing device; after the preset temperature value of the condensed water at the outlet of the condensed water steam heat exchanger (12) is input, the PID controller controls the steam flow so as to control the temperature of the condensed water at the outlet of the condensed water steam heat exchanger (12), and the current temperature of the condensed water at the outlet of the condensed water steam heat exchanger (12) is displayed through a thermal resistor (32) of a condensed water pipe at the outlet of the condensed water steam heat exchanger;
s3, the temperature of a steam drain pipe thermal resistor (34) at the outlet of the condensed water steam heat exchanger and a condensed water pipe regulating valve (23) at the inlet of the condensed water steam heat exchanger form a PID control loop, and the control of the steam drain temperature at the outlet of the condensed water steam heat exchanger (13) is realized by controlling the opening of the condensed water pipe regulating valve (23) at the inlet of the condensed water steam heat exchanger; after a preset steam drainage temperature value at the outlet of the condensed water steam drainage heat exchanger (13) is input, a PID controller controls the inflow of condensed water of the condensed water steam drainage heat exchanger (13), further controls the steam drainage temperature at the outlet of the condensed water steam drainage heat exchanger (13), and displays the current steam drainage temperature at the outlet of the condensed water steam drainage heat exchanger (13) through a steam drainage pipe thermal resistor (34) at the outlet of the condensed water steam drainage heat exchanger.
8. The control method for the tubular heat exchanger heating medium water waste heat heating condensate system according to claim 7, further comprising the following steps of controlling the temperature of steam at the outlet of the steam temperature and pressure reducing device: the outlet thermal resistor (33) of the steam temperature and pressure reducing device and the outlet regulating valve (24) of the temperature and pressure reducing water pump form a PID control loop, and the temperature of the steam at the outlet of the steam temperature and pressure reducing device (14) is controlled by controlling the opening of the outlet regulating valve (24) of the temperature and pressure reducing water pump; after the preset steam temperature value at the outlet of the steam temperature and pressure reducing device (14) is input, the PID controller controls the inflow of the temperature reducing water, so that the steam temperature at the outlet of the steam temperature and pressure reducing device (14) is controlled, and the current steam temperature at the outlet of the steam temperature and pressure reducing device (14) is displayed through a steam temperature and pressure reducing device outlet thermal resistor (33).
9. The control method for the tubular heat exchanger heating medium water waste heat heating condensate system according to claim 7, further comprising the following steps of: when the liquid level meter (35) of the steam drain tank displays a low liquid level, a water replenishing switch valve (25) of the steam drain tank is opened; when the steam trap level meter (35) displays a high liquid level, the water replenishing switch valve (25) of the steam trap is closed.
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