CN213930887U - Blowdown steam recovery system of multi-pressure boiler - Google Patents
Blowdown steam recovery system of multi-pressure boiler Download PDFInfo
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- CN213930887U CN213930887U CN202022209848.9U CN202022209848U CN213930887U CN 213930887 U CN213930887 U CN 213930887U CN 202022209848 U CN202022209848 U CN 202022209848U CN 213930887 U CN213930887 U CN 213930887U
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Abstract
The utility model relates to a blowdown steam recovery system of multi-pressure boiler. The utility model discloses a high pressure steam pocket, the middling pressure steam pocket, the low pressure steam pocket, the flash tank is even arranged to the middling pressure, the flash tank is even arranged to the low pressure, regularly blowdown flash tank, the high pressure steam pocket is even arranged the flash tank through high-pressure continuous blowdown pipeline and middling pressure and is connected, the middling pressure is even arranged the flash tank and is connected and be connected with the middling pressure steam pocket through first governing valve and low pressure even arrange the flash tank through first check valve, the middling pressure steam pocket is even arranged the flash tank through middling pressure continuous blowdown pipeline and low pressure and is connected, the low pressure is even arranged the flash tank and is connected and be connected with the low pressure steam pocket through the second governing valve with regularly blowdown flash tank, the low pressure steam pocket passes through low pressure continuous blowdown pipeline and is connected with regularly blowdown flash tank. The utility model discloses an add the middling pressure and even arrange the flash vessel, the blow off water of high pressure steam pocket is at the middling pressure even arrange the flash vessel and the low pressure is even arrange the flash vessel and is realized the step flash distillation, has promoted the thermal efficiency of recovery and utilization blowdown steam greatly.
Description
Technical Field
The utility model relates to a waste heat boiler's drainage especially relates to a blowdown steam recovery system of multi-pressure boiler, belongs to power plant boiler equipment technical field.
Background
With the use of clean energy in larger and larger proportions, the construction of natural gas combined cycle power plants will continue to grow. One development trend in combined cycle technology is to increase the capacity, and in order to improve the efficiency of the combined cycle technology, the associated waste heat boiler usually employs a multi-pressure system to utilize the energy of the exhaust gas of the combustion engine to the maximum. Because the blowdown rate of boiler is generally fixed, the evaporation capacity of boiler is bigger, and the blowdown capacity is just bigger, and the energy that blowdown lost is just more also more. Therefore, the addition of a blowdown vapor recovery system in the blowdown system is a necessary measure for reducing energy waste and improving the thermal efficiency of the combustion engine. The existing blowdown steam recovery system is shown in fig. 1, and is provided with a low-pressure continuous blowdown flash tank 5 for receiving the blowdown of a steam drum and a timing blowdown flash tank 6; sewage of the high-pressure steam drum 1 and the medium-pressure steam drum 2 is discharged into the low-pressure continuous-discharge flash tank 5 through a connecting pipeline, flash steam generated by the low-pressure continuous-discharge flash tank 5 is sent to the low-pressure steam drum 3 for recycling, and residual waste water is discharged into the timing sewage flash tank 6; the sewage of the low-pressure steam pocket 3 is directly discharged into the timed sewage flash tank 6, the flash steam generated in the timed sewage flash tank 6 is discharged into the atmosphere as waste gas, and the residual waste water is cooled and then discharged into a sewage pool. Such blowdown vapor recovery systems have the following drawbacks in operation: the sewage of the high-pressure steam drum and the medium-pressure steam drum is received by the low-pressure continuous-discharge flash tank, and because the energy grade of the sewage of the high-pressure steam drum 1 is higher and the operating parameter of the low-pressure continuous-discharge flash tank is lower, the flash steam generated by recovery can only be used for a low-pressure system. Therefore, the existing blowdown steam recovery system is insufficient in heat recovery of the blowdown water of the high-pressure steam drum, waste is large, and the heat efficiency of the system is low.
Disclosure of Invention
The utility model discloses solve the heat recovery to high-pressure steam pocket blow off water that prior art exists and insufficiently lead to the lower technical defect of system thermal efficiency, provide a comparatively abundant therefore the higher multipressure boiler's of thermal efficiency blowdown steam recovery system of heat recovery of high-pressure steam pocket blow off water.
The utility model discloses to above-mentioned technical problem mainly can solve through following technical scheme: the utility model comprises a high pressure steam pocket, a medium pressure steam pocket, a low pressure continuous discharging flash tank, a timing discharging flash tank, wherein the medium pressure steam pocket is connected with the low pressure continuous discharging flash tank through a medium pressure continuous discharging pipeline, the low pressure steam pocket is connected with the timing discharging flash tank through a low pressure continuous discharging pipeline, a flash steam outlet of the low pressure continuous discharging flash tank is connected with the low pressure steam pocket through a connecting pipeline provided with a second check valve, a waste water outlet of the low pressure continuous discharging flash tank is connected with the timing discharging flash tank through a connecting pipeline provided with a second regulating valve, the device is characterized by further comprising a medium-pressure continuous-discharge flash tank, the high-pressure steam pocket is connected with the medium-pressure continuous-discharge flash tank through a high-pressure continuous blowdown pipeline, a wastewater outlet of the medium-pressure continuous-discharge flash tank is connected with the low-pressure continuous-discharge flash tank through a connecting pipeline provided with a first regulating valve, and a flash steam outlet of the medium-pressure continuous-discharge flash tank is connected with the medium-pressure steam pocket through a connecting pipeline provided with a first check valve.
Preferably, the high-pressure sewage treatment device further comprises a high-pressure sewage discharge bypass, an inlet of the high-pressure sewage discharge bypass is connected with the high-pressure continuous sewage discharge pipeline, an outlet of the high-pressure sewage discharge bypass is connected with the timing sewage discharge flash tank, and a high-pressure bypass control valve is arranged on the high-pressure sewage discharge bypass.
Preferably, the sewage treatment system further comprises a medium-pressure sewage discharge bypass, wherein an inlet of the medium-pressure sewage discharge bypass is connected with the medium-pressure continuous sewage discharge pipeline, an outlet of the medium-pressure sewage discharge bypass is connected with the timing sewage discharge flash tank, and a medium-pressure bypass control valve is arranged on the medium-pressure sewage discharge bypass.
Preferably, the high-pressure continuous sewage draining pipeline is provided with a high-pressure sewage draining control valve and a high-pressure manual control valve, the high-pressure manual control valve is positioned at the rear side of the high-pressure sewage draining control valve according to sewage, and the inlet of the high-pressure sewage draining bypass is positioned between the high-pressure sewage draining control valve and the high-pressure manual control valve.
Preferably, the medium-pressure continuous sewage pipeline is provided with a medium-pressure sewage control valve and a medium-pressure manual control valve, the medium-pressure manual control valve is positioned at the rear side of the medium-pressure sewage control valve according to sewage, and the inlet of the medium-pressure sewage bypass is positioned between the medium-pressure sewage control valve and the medium-pressure manual control valve.
Therefore, the utility model discloses rational in infrastructure has following advantage:
1. the utility model discloses in, the system has add the medium-pressure and has arranged the flash tank even. The medium-pressure continuous-discharge flash tank is used for recovering sewage of the high-pressure steam drum, and flash steam generated by the sewage of the high-pressure steam drum in the medium-pressure continuous-discharge flash tank is sent to the medium-pressure steam drum. The medium-pressure continuous-discharge flash tank has relatively high operation parameters, so that the steam parameters and the energy grade of flash steam are improved, and the flash steam generated by the medium-pressure continuous-discharge flash tank can be sent to a medium-pressure system for utilization. Therefore, compare in prior art, the utility model discloses heat recovery to high-pressure steam pocket blow off water is more abundant, has promoted the thermal efficiency of recycle blowdown steam greatly.
2. The pressure difference between the high-pressure steam pocket and the medium-pressure continuous-discharge flash tank is smaller, so that the pressure reduction pressure difference of sewage discharged from the high-pressure steam pocket into the medium-pressure continuous-discharge flash tank is smaller, the gas corrosion in the pipeline of the high-pressure continuous-discharge pipeline is smaller, and the service lives of the pipeline and the valve are greatly prolonged.
3. The main evaporation capacity of the combined cycle comes from the high pressure system and thus most of the blowdown water comes from the high pressure drum. After sewage of the high-pressure steam drum enters the medium-pressure continuous-discharge flash tank, flash steam and wastewater are generated, the flash steam is sent to the medium-pressure steam drum, and the residual wastewater is discharged into the low-pressure continuous-discharge flash tank; and the wastewater from the medium-pressure continuous discharge flash tank enters the low-pressure continuous discharge flash tank for flash evaporation again, the flash evaporation steam is sent to the low-pressure steam drum for recycling, and the residual wastewater is discharged into the timed sewage discharge flash tank. Because the sewage of the high-pressure steam pocket is recycled (flashed) in a cascade way through the medium-pressure continuous-discharge flash tank and the low-pressure continuous-discharge flash tank, the volumes of the medium-pressure continuous-discharge flash tank and the low-pressure continuous-discharge flash tank are relatively small, and the optimization of the equipment arrangement in a boiler area is facilitated.
Furthermore, a high-pressure sewage discharge bypass is arranged on the high-pressure continuous sewage discharge pipeline, and a medium-pressure sewage discharge bypass is arranged on the medium-pressure continuous sewage discharge pipeline. When the medium-pressure or low-pressure continuous-discharge flash tank has a fault, the high-pressure steam drum sewage can be directly discharged into the timing sewage flash tank through the high-pressure sewage bypass, and the medium-pressure steam drum sewage can be directly discharged into the timing sewage flash tank through the medium-pressure sewage bypass, so that the continuous normal sewage discharge of the high-pressure steam drum and the medium-pressure steam drum can be ensured.
The utility model discloses can also be solved through following technical scheme to above-mentioned technical problem: the utility model comprises a high pressure steam pocket, a medium pressure steam pocket, a low pressure continuous discharge flash tank, a timing discharge flash tank, wherein the medium pressure steam pocket is connected with the low pressure continuous discharge flash tank through a medium pressure continuous discharge pipeline, the low pressure steam pocket is connected with the timing discharge flash tank through a low pressure continuous discharge pipeline, a waste water outlet of the low pressure continuous discharge flash tank is connected with the timing discharge flash tank through a connecting pipeline provided with a second regulating valve, the flash steam outlet of the low pressure continuous discharge flash tank is connected with a low pressure saturated steam outlet pipeline of the low pressure steam pocket through a connecting pipeline provided with a second check valve, the flash steam flash tank also comprises a medium pressure continuous discharge flash tank, the high pressure steam pocket is connected with the medium pressure continuous discharge flash tank through a high pressure continuous discharge pipeline, the waste water outlet of the medium pressure continuous discharge flash tank is connected with the low pressure continuous discharge flash tank through a connecting pipeline provided with a first regulating valve, the flash steam outlet of the medium-pressure continuous-discharge flash tank is connected with the medium-pressure saturated steam outlet pipeline of the medium-pressure steam drum through a connecting pipeline provided with a first check valve.
The utility model discloses in, the flash steam outlet of the flash evaporation of medium pressure even row flash vessel is connected with the middling pressure saturated steam outlet pipeline of middling pressure steam pocket through the connecting tube who sets up first check valve, and the flash evaporation steam outlet of low pressure even row flash vessel is connected with the low pressure saturated steam outlet pipeline of low pressure steam pocket through the connecting tube who sets up the second check valve. This technical scheme is particularly useful for when the multipressure boiler that has put into operation reforms transform blowdown steam recovery system, need add the condition of middling pressure continuous discharge flash vessel under, the flash steam that continuous discharge flash vessel produced can directly be sent to saturated steam outlet pipe way and needn't get into the steam pocket, has avoided addding the trompil that is used for retrieving flash steam on the steam pocket, has both guaranteed the security of steam pocket, has simplified the process of system transformation again, has reduced the degree of difficulty of reforming transform.
The utility model discloses can also be solved through following technical scheme to above-mentioned technical problem: the utility model comprises a high pressure steam pocket, a medium pressure steam pocket, a low pressure continuous discharge flash tank, a timing discharge flash tank, wherein the medium pressure steam pocket is connected with the low pressure continuous discharge flash tank through a medium pressure continuous discharge pipeline, a flash steam outlet of the low pressure continuous discharge flash tank is connected with the low pressure steam pocket through a connecting pipeline provided with a second check valve, a waste water outlet of the low pressure continuous discharge flash tank is connected with the timing discharge flash tank through a connecting pipeline provided with a second regulating valve, the device is characterized by further comprising a medium-pressure continuous-discharge flash tank, the high-pressure steam pocket is connected with the medium-pressure continuous-discharge flash tank through a high-pressure continuous blowdown pipeline, a wastewater outlet of the medium-pressure continuous-discharge flash tank is connected with the low-pressure continuous-discharge flash tank through a connecting pipeline provided with a first regulating valve, and a flash steam outlet of the medium-pressure continuous-discharge flash tank is connected with the medium-pressure steam pocket through a connecting pipeline provided with a first check valve.
The utility model discloses in, even arrange the flash tank through setting up the middling pressure and be used for retrieving the blow off water of high-pressure steam pocket, the blow off water of high-pressure steam pocket produces flash steam in the middling pressure even arranges the flash tank and sends to the middling pressure steam pocket. Compared with the prior art, the heat recovery of the high-pressure steam drum sewage is more sufficient, and the heat efficiency of the recovered and utilized sewage steam is greatly improved; simultaneously, in view of many pressure boilers, the evaporation capacity of low pressure steam pocket is often lower, and the water in the low pressure steam pocket is the water supply source of most conduct height, middling pressure steam pocket moreover, and consequently quality of water in the low pressure steam pocket is better, does not have the necessity of continuous blowdown, so the utility model discloses in, cancelled the continuous blowdown pipeline of low pressure that is used for the continuous blowdown of low pressure steam pocket, so both practiced thrift the preparation and the administrative cost of equipment, avoided again because the heat energy loss that the continuous blowdown of low pressure steam pocket brought.
Drawings
FIG. 1 is a prior art schematic;
FIG. 2 is a schematic diagram of a preferred embodiment of the present invention;
fig. 3 is a schematic view of another preferred embodiment of the present invention;
FIG. 4 is a schematic view of a second preferred embodiment of the present invention;
fig. 5 is a schematic view of a third preferred embodiment of the present invention.
Description of reference numerals: 1. a high pressure steam drum; 2. a medium pressure steam drum; 21. a medium pressure saturated steam outlet line; 3. a low pressure steam drum; 31. a low pressure saturated steam outlet line; 4. a medium-pressure continuous-discharge flash tank 5 and a low-pressure continuous-discharge flash tank; 6. a timed blowdown flash tank; 7. a high-pressure continuous sewage discharge pipeline; 71. a high pressure blowdown control valve; 72. a high pressure manual control valve; 8. a medium-pressure continuous blowdown pipeline; 81. a medium pressure blowdown control valve; 82. a medium pressure manual control valve; 9. a low-pressure continuous blowdown pipeline; 91. a low pressure blowdown control valve; 10. a first regulating valve; 11. a second regulating valve; 12. a first check valve; 13. a second check valve; a medium-pressure blowdown bypass; 161. a medium pressure bypass control valve; 17. a high pressure blowdown bypass; 171. a high pressure bypass control valve.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example 1: as shown in the attached figure 2, the utility model comprises a high pressure steam pocket 1, a medium pressure steam pocket 2, a low pressure steam pocket 3, a medium pressure continuous discharge flash tank 4, a low pressure continuous discharge flash tank 5 and a timing pollution discharge flash tank 6;
a sewage discharge outlet of the high-pressure steam drum 1 is connected with the medium-pressure continuous-discharge expansion tank 4 through a high-pressure continuous sewage discharge pipeline 7, and a high-pressure sewage discharge control valve 71 is arranged on the high-pressure continuous sewage discharge pipeline 7;
a flash steam outlet on the medium-pressure continuous discharge flash tank 4 is connected with the medium-pressure steam drum 2 through a connecting pipeline provided with a first check valve 12, and a wastewater outlet of the medium-pressure continuous discharge flash tank 4 is connected with a wastewater inlet of the low-pressure continuous discharge flash tank 5 through a connecting pipeline provided with a first regulating valve 10;
a sewage discharge outlet of the medium-pressure steam drum 2 is connected with the low-pressure continuous drainage expansion tank 5 through a medium-pressure continuous sewage discharge pipeline 8, and a medium-pressure sewage discharge control valve 81 is arranged on the medium-pressure continuous sewage discharge pipeline 8;
a flash steam outlet in the low-pressure continuous discharge flash tank 5 is connected with the low-pressure steam drum 3 through a connecting pipeline provided with a second check valve 13, and a wastewater outlet of the low-pressure continuous discharge flash tank 5 is connected with a wastewater inlet of the timing pollution discharge flash tank 6 through a connecting pipeline provided with a second regulating valve 11;
the blowdown outlet of the low-pressure steam pocket 3 is connected with the timing blowdown flash tank 6 through a low-pressure continuous blowdown pipeline 9, and the low-pressure continuous blowdown pipeline 9 is provided with a low-pressure blowdown control valve 91.
When the boiler operates, the continuous sewage of the high-pressure steam pocket 1 is discharged into the medium-pressure continuous-discharge flash tank 4 through the high-pressure continuous sewage discharge pipeline 7, and the high-pressure sewage discharge control valve 71 is used for controlling the sewage discharge amount of the high-pressure steam pocket 1; sewage from the high-pressure steam drum 1 is subjected to flash expansion in the medium-pressure continuous-discharge flash tank 4, flash steam is sent to the medium-pressure steam drum 2 through a connecting pipeline provided with a first check valve 12, and the first check valve 12 is used for preventing steam in the medium-pressure steam drum 2 from flowing back to the medium-pressure continuous-discharge flash tank 4; the residual wastewater after the flash evaporation is discharged into the low-pressure continuous discharge flash tank 5 through a connecting pipeline provided with a first regulating valve 10, wherein the first regulating valve 10 is used for controlling the water level of the medium-pressure continuous discharge flash tank 4 so as to prevent flash evaporation steam from entering the low-pressure continuous discharge flash tank 5 through the first regulating valve 10;
continuous blowdown of the medium-pressure steam drum 2 is discharged into the low-pressure continuous blowdown flash tank 5 through a medium-pressure continuous blowdown pipeline 8, and a medium-pressure blowdown control valve 81 is used for controlling blowdown amount of the medium-pressure steam drum 2; the blowdown water from the medium-pressure steam drum 2 and the wastewater from the medium-pressure continuous discharge flash tank 4 are subjected to flash expansion in the low-pressure continuous discharge flash tank 5, the flash steam is sent to the low-pressure steam drum 3 through a connecting pipeline provided with a second check valve 13, and the second check valve 13 is used for preventing the steam in the low-pressure steam drum 3 from flowing back to the low-pressure continuous discharge flash tank 5; the residual wastewater after the flash evaporation is discharged into the timing pollution discharge flash tank 6 through a connecting pipeline provided with a second regulating valve 11, wherein the second regulating valve 11 is used for controlling the water level of the medium-pressure continuous discharge flash tank 5 so as to prevent flash evaporation steam from entering the timing pollution discharge flash tank 6 through the second regulating valve 11;
the continuous blowdown of the low-pressure steam pocket 3 is discharged into the timed blowdown flash tank 6 through the low-pressure continuous blowdown pipeline 9, the low-pressure blowdown control valve 91 is used for controlling the blowdown amount of the low-pressure steam pocket 3; the sewage from the low-pressure steam drum 3 and the wastewater from the low-pressure continuous discharge flash tank 5 are subjected to capacity expansion flash in the timing sewage discharge flash tank 6, flash steam is discharged into the atmosphere through a steam discharge pipeline, and the residual wastewater after flash evaporation is cooled by cooling water and then is discharged into a wastewater pool.
Example 2: as shown in the attached figure 3, the utility model comprises a high pressure steam pocket 1, a medium pressure steam pocket 2, a low pressure steam pocket 3, a medium pressure continuous discharge flash tank 4, a low pressure continuous discharge flash tank 5 and a timing pollution discharge flash tank 6;
a sewage outlet of the high-pressure steam drum 1 is connected with the medium-pressure continuous drainage flash tank 4 through a high-pressure continuous sewage pipeline 7, a high-pressure sewage control valve 71 and a high-pressure manual control valve 72 are arranged on the high-pressure continuous sewage pipeline 7, and the high-pressure manual control valve 72 is positioned at the rear side of the high-pressure sewage control valve 71 according to sewage;
a flash evaporation steam outlet of the medium-pressure continuous discharge flash tank 4 is connected with the medium-pressure steam drum 2 through a connecting pipeline provided with a first check valve 12, and a wastewater outlet of the medium-pressure continuous discharge flash tank 4 is connected with a wastewater inlet of the low-pressure continuous discharge flash tank 5 through a connecting pipeline provided with a first regulating valve 10;
a sewage outlet of the medium-pressure steam drum 2 is connected with the low-pressure continuous drainage expander 5 through a medium-pressure continuous sewage pipeline 8, a medium-pressure sewage control valve 81 and a medium-pressure manual control valve 82 are arranged on the medium-pressure continuous sewage pipeline 8, and the medium-pressure manual control valve 82 is positioned at the rear side of the medium-pressure sewage control valve 81 according to sewage;
a flash steam outlet of the low-pressure continuous discharge flash tank 5 is connected with the low-pressure steam drum 3 through a second check valve 13, and a wastewater outlet of the low-pressure continuous discharge flash tank 5 is connected with a wastewater inlet of the timed blowdown flash tank 6 through a connecting pipeline provided with a second regulating valve 11;
a blowdown outlet of the low-pressure steam drum 3 is connected with the timed blowdown flash tank 6 through a low-pressure continuous blowdown pipeline 9, and a low-pressure blowdown control valve 91 is arranged on the low-pressure continuous blowdown pipeline 9;
the high-pressure continuous sewage discharge pipeline 7 is also connected with a high-pressure sewage discharge bypass 17, the inlet of the high-pressure sewage discharge bypass 17 is connected with the high-pressure continuous sewage discharge pipeline 7 at the position between the high-pressure sewage discharge control valve 71 and the high-pressure manual control valve 72, the outlet of the high-pressure sewage discharge bypass 17 is connected with the timing sewage discharge flash tank 6, and the high-pressure sewage discharge bypass 17 is provided with a normally closed high-pressure bypass control valve 171;
the medium-pressure continuous sewage pipeline 8 is also connected with a medium-pressure sewage bypass 16, the inlet of the medium-pressure sewage bypass 16 is connected with the medium-pressure continuous sewage pipeline 8 at the position between the medium-pressure sewage control valve 81 and the medium-pressure manual control valve 82, the outlet of the medium-pressure sewage bypass 16 is connected with the timing sewage flash tank 6, and the medium-pressure sewage bypass 16 is provided with a normally closed medium-pressure bypass control valve 161.
In the operation process of the boiler, the utility model can realize the step recovery (flash evaporation) of the sewage discharged by the high-pressure steam pocket 1, and can also open the normally closed high-pressure bypass control valve 171 by closing the high-pressure manual control valve 72 when the medium-pressure continuous discharge flash tank 4 has a fault, and directly discharge the continuous sewage discharged by the high-pressure steam pocket 1 into the timing sewage discharge flash tank 6 by utilizing the high-pressure sewage discharge bypass 17 so as to ensure the continuous normal sewage discharge of the high-pressure steam pocket 1;
similarly, when the low-pressure continuous blowdown flash tank 5 has a fault, the continuous normal blowdown of the medium-pressure steam drum 2 can be ensured by closing the medium-pressure manual control valve 82 and simultaneously opening the normally closed medium-pressure bypass control valve 161 and directly discharging the continuous blowdown of the medium-pressure steam drum 2 into the timed blowdown flash tank 6 by using the medium-pressure blowdown bypass 16.
Example 3: as shown in fig. 4, the utility model comprises a high pressure steam drum 1, a medium pressure steam drum 2, a low pressure steam drum 3, a medium pressure continuous discharge flash tank 4, a low pressure continuous discharge flash tank 5 and a timing pollution discharge flash tank 6;
a sewage discharge outlet of the high-pressure steam drum 1 is connected with the medium-pressure continuous-discharge expansion tank 4 through a high-pressure continuous sewage discharge pipeline 7, and a high-pressure sewage discharge control valve 71 is arranged on the high-pressure continuous sewage discharge pipeline 7;
a flash evaporation steam outlet of the medium-pressure continuous discharge flash tank 4 is connected with the medium-pressure steam drum 2 through a connecting pipeline provided with a first check valve 12, and a wastewater outlet of the medium-pressure continuous discharge flash tank 4 is connected with a wastewater inlet of the low-pressure continuous discharge flash tank 5 through a connecting pipeline provided with a first regulating valve 10;
a sewage discharge outlet of the medium-pressure steam drum 2 is connected with the low-pressure continuous drainage expansion tank 5 through a medium-pressure continuous sewage discharge pipeline 8, and a medium-pressure sewage discharge control valve 81 is arranged on the medium-pressure continuous sewage discharge pipeline 8;
the flash steam outlet of the low-pressure continuous discharge flash tank 5 is connected with the low-pressure steam drum 3 through a connecting pipeline provided with a second check valve 13, and the waste water outlet of the low-pressure continuous discharge flash tank 5 is connected with the waste water inlet of the timing pollution discharge flash tank 6 through a connecting pipeline provided with a second regulating valve 11.
In this embodiment, the low pressure drum 3 cancels the low pressure continuous blowdown pipeline, i.e. the low pressure drum 3 does not perform continuous blowdown, thereby reducing the heat energy loss caused by the low pressure continuous blowdown.
Example 4: as shown in fig. 5, the utility model comprises a high pressure steam drum 1, a medium pressure steam drum 2, a low pressure steam drum 3, a medium pressure continuous discharge flash tank 4, a low pressure continuous discharge flash tank 5 and a timing pollution discharge flash tank 6;
a sewage discharge outlet of the high-pressure steam drum 1 is connected with the medium-pressure continuous-discharge expansion tank 4 through a high-pressure continuous sewage discharge pipeline 7, and a high-pressure sewage discharge control valve 71 is arranged on the high-pressure continuous sewage discharge pipeline 7;
a flash evaporation steam outlet of the medium-pressure continuous discharge flash tank 4 is connected with a medium-pressure saturated steam outlet pipeline 21 of the medium-pressure steam drum 2 through a connecting pipeline, and a wastewater outlet of the medium-pressure continuous discharge flash tank 4 is connected with a wastewater inlet of the low-pressure continuous discharge flash tank 5 through a first regulating valve 10;
a sewage discharge outlet of the medium-pressure steam drum 2 is connected with the low-pressure continuous drainage expansion tank 5 through a medium-pressure continuous sewage discharge pipeline 8, and a medium-pressure sewage discharge control valve 81 is arranged on the medium-pressure continuous sewage discharge pipeline 8;
a flash evaporation steam outlet of the low-pressure continuous discharge flash tank 5 is connected with a low-pressure saturated steam outlet pipeline 31 of the low-pressure steam drum 3 through a connecting pipeline, and a wastewater outlet of the low-pressure continuous discharge flash tank 5 is connected with a wastewater inlet of the timed blowdown flash tank 6 through a connecting pipeline provided with a second regulating valve 11;
the blowdown outlet of the low-pressure steam pocket 3 is connected with the timing blowdown flash tank 6 through a low-pressure continuous blowdown pipeline 9, and the low-pressure continuous blowdown pipeline 9 is provided with a low-pressure blowdown control valve 91.
The utility model discloses in, the flash steam export of middling pressure even row flash vessel 4 is connected with middling pressure saturated steam outlet pipeline 21 of middling pressure steam pocket 2, and the flash steam export of low pressure even row flash vessel 5 is connected with low pressure saturated steam outlet pipeline 31 of low pressure steam pocket 3, and flash steam can directly send into saturated steam outlet pipeline as saturated steam and supply the unit to use.
Of course, the drawings and examples are only for the purpose of illustrating and explaining the present invention and should not be taken as unduly limiting the invention. All the technical solutions obtained by making equivalent adjustments and changes according to the present invention fall within the protection scope of the present invention.
Claims (7)
1. A blowdown steam recovery system of a multi-pressure boiler comprises a high-pressure steam drum (1), a medium-pressure steam drum (2), a low-pressure steam drum (3), a low-pressure continuous blowdown flash tank (5) and a timing blowdown flash tank (6), wherein the medium-pressure steam drum (2) is connected with the low-pressure continuous blowdown flash tank (5) through a medium-pressure continuous blowdown pipeline (8), the low-pressure steam drum (3) is connected with the timing blowdown flash tank (6) through a low-pressure continuous blowdown pipeline (9), a flash steam outlet of the low-pressure continuous blowdown flash tank (5) is connected with the low-pressure steam drum (3) through a connecting pipeline provided with a second check valve (13), a wastewater outlet of the low-pressure continuous blowdown flash tank (5) is connected with the timing blowdown flash tank (6) through a connecting pipeline provided with a second regulating valve (11), and is characterized by further comprising a medium-pressure continuous blowdown flash tank (4), high-pressure steam pocket (1) through high-pressure continuous blowdown pipeline (7) with the middling pressure is even to arrange flash tank (4) and is connected, the middling pressure even arrange the waste water outlet of flash tank (4) through be provided with first governing valve (10) the connecting tube with the low pressure is even to arrange flash tank (5) and is connected, the middling pressure even arrange flash steam outlet of flash tank (4) through be provided with the connecting tube of first check valve (12) with middling pressure steam pocket (2) are connected.
2. The blowdown steam recovery system of the multi-pressure boiler as claimed in claim 1, further comprising a high pressure blowdown bypass (17), wherein an inlet of the high pressure blowdown bypass (17) is connected with the high pressure continuous blowdown line (7) and an outlet is connected with the timed blowdown flash tank (6), and a high pressure bypass control valve (171) is disposed on the high pressure blowdown bypass (17).
3. A blowdown steam recovery system of a multi-pressure boiler as claimed in claim 1 or 2, further comprising a medium pressure blowdown bypass (16), an inlet of said medium pressure blowdown bypass (16) being connected with said medium pressure continuous blowdown line (8) and an outlet being connected with said timed blowdown flash tank (6), said medium pressure blowdown bypass (16) being provided with a medium pressure bypass control valve (161).
4. The blowdown steam recovery system of the multi-pressure boiler as claimed in claim 2, wherein a high pressure blowdown control valve (71) and a high pressure manual control valve (72) are provided on the high pressure continuous blowdown line (7), the high pressure manual control valve (72) is located at a rear side of the high pressure blowdown control valve (71) according to a flow direction of blowdown water, and an inlet of the high pressure blowdown bypass (17) is located between the high pressure blowdown control valve (71) and the high pressure manual control valve (72).
5. The blowdown steam recovery system of the multi-pressure boiler as claimed in claim 3, wherein the medium pressure continuous blowdown line (8) is provided with a medium pressure blowdown control valve (81) and a medium pressure manual control valve (82), the medium pressure manual control valve (82) is located at a rear side of the medium pressure blowdown control valve (81) according to a flow direction of blowdown water, and an inlet of the medium pressure blowdown bypass (16) is located between the medium pressure blowdown control valve (81) and the medium pressure manual control valve (82).
6. A blowdown steam recovery system of a multi-pressure boiler comprises a high-pressure steam drum (1), a medium-pressure steam drum (2), a low-pressure steam drum (3), a low-pressure continuous blowdown flash tank (5) and a timing blowdown flash tank (6), wherein the medium-pressure steam drum (2) is connected with the low-pressure continuous blowdown flash tank (5) through a medium-pressure continuous blowdown pipeline (8), the low-pressure steam drum (3) is connected with the timing blowdown flash tank (6) through a low-pressure continuous blowdown pipeline (9), a wastewater outlet of the low-pressure continuous blowdown flash tank (5) is connected with the timing blowdown flash tank (6) through a connecting pipeline provided with a second regulating valve (11), and the system is characterized in that a flash steam outlet of the low-pressure continuous blowdown flash tank (5) is connected with a low-pressure saturated steam outlet pipeline (31) of the low-pressure steam drum (3) and further comprises a medium-pressure continuous blowdown flash tank (4), high pressure steam pocket (1) through high-pressure continuous blowdown pipeline (7) with the middling pressure is even to be arranged flash tank (4) and is connected, the middling pressure even arrange the waste water outlet of flash tank (4) through be provided with the connecting tube of first governing valve (10) with the low pressure is even to be arranged flash tank (5) and is connected, the middling pressure even arrange flash steam outlet of flash tank (4) with middling pressure saturated steam outlet pipeline (21) of middling pressure steam pocket (2) are connected.
7. A blowdown steam recovery system of a multi-pressure boiler comprises a high-pressure steam drum (1), a medium-pressure steam drum (2), a low-pressure steam drum (3), a low-pressure continuous-discharge flash tank (5) and a timing blowdown flash tank (6), wherein the medium-pressure steam drum (2) is connected with the low-pressure continuous-discharge flash tank (5) through a medium-pressure continuous blowdown pipeline (8), a flash steam outlet of the low-pressure continuous-discharge flash tank (5) is connected with the low-pressure steam drum (3) through a connecting pipeline provided with a second check valve (13), a wastewater outlet of the low-pressure continuous-discharge flash tank (5) is connected with the timing blowdown flash tank (6) through a connecting pipeline provided with a second regulating valve (11), and the blowdown flash tank is characterized by further comprising a medium-pressure continuous-discharge flash tank (4), wherein the high-pressure steam drum (1) is connected with the medium-pressure continuous-discharge flash tank (4) through a high-pressure continuous blowdown pipeline (7), the waste water outlet of the medium-pressure continuous-discharge flash tank (4) is connected with the low-pressure continuous-discharge flash tank (5) through a connecting pipeline provided with a first regulating valve (10), and the flash steam outlet of the medium-pressure continuous-discharge flash tank (4) is connected with the medium-pressure steam drum (2) through a connecting pipeline provided with a first check valve (12).
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| CN112128731A (en) * | 2020-09-30 | 2020-12-25 | 东方菱日锅炉有限公司 | Blowdown steam recovery system of multi-pressure boiler |
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