CN211586121U - Ammonia distribution system - Google Patents
Ammonia distribution system Download PDFInfo
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- CN211586121U CN211586121U CN201922118607.0U CN201922118607U CN211586121U CN 211586121 U CN211586121 U CN 211586121U CN 201922118607 U CN201922118607 U CN 201922118607U CN 211586121 U CN211586121 U CN 211586121U
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Abstract
The utility model discloses a join in marriage ammonia system, include: ammonia water storage equipment and demineralized water storage equipment; the first liquid inlet of the ammonia water dosing box is hermetically connected with ammonia water storage equipment through a first electric control valve, and the second liquid inlet of the ammonia water dosing box is hermetically connected with desalted water storage equipment through a second electric control valve; the first liquid level sensor is arranged in the ammonia water dosing tank and used for collecting the liquid level of liquid in the ammonia water dosing tank; the main control module is respectively electrically connected with the first electric control valve, the second electric control valve and the first liquid level sensor and is used for determining an ammonia water target liquid level and a desalted water target liquid level in the ammonia water dosing tank according to target dosing information, controlling the first electric control valve to be opened and closed according to the liquid level acquired by the first liquid level sensor and the ammonia water target liquid level, and controlling the second electric control valve to be opened and closed according to the liquid level acquired by the first liquid level sensor and the desalted water target liquid level so as to realize the safe storage and transportation of the ammonia water of the power plant.
Description
Technical Field
The embodiment of the utility model provides a generating set adds ammonia and joins in marriage ammonia technical field, especially relates to a join in marriage ammonia system.
Background
The water vapor is used as a circulating working medium of the thermal equipment of the generator set, and plays an important role in realizing energy conversion of the generator set. The quality of the water vapor has great significance on the corrosion protection, the service life and the safe and economic operation of the thermal equipment.
Wherein, early aqueous ammonia is stored, it is mainly placed in aqueous ammonia adds the medicine room and puts through purchasing barreled aqueous ammonia, ammonia case liquid medicine is used up the back, just add the aqueous ammonia through artifical aqueous ammonia mode of pouring the aqueous ammonia and dissolve medicine case and mend, strong aqueous ammonia has strong pungent smell, volatility is strong, it is poisonous, there is irritability and corrosivity to eye, nose, skin, enable the people to suffocate, and it is airtight to add the ammonia room, the gas permeability is poor, empty the aqueous ammonia under the condition with the protective mask, still often take place the aqueous ammonia poisoning incident, it is very big to staff's health injury to engage in the work of adding ammonia for a long time.
With the gradual operation of flue gas denitration devices of thermoelectric generator sets in recent years, power plants which adopt liquid ammonia as a denitration reducing agent are provided with a liquid ammonia storage tank, and the liquid ammonia is converted into ammonia gas through steam heating and serves as the denitration reducing agent. The ammonia converted from the liquid ammonia has high purity and less impurities, and can be used as an ammonia source for adding medicines to a unit. The ammonia in the ammonia district is carried to dosing room to the connecting tube way that has the power plant and dispenses, and the operating personnel can dispose the aqueous ammonia of required concentration through the operating valve, has avoided personnel direct contact liquid ammonia or ammonia to the risk of ammonia poisoning has been avoided. However, according to policy requirements, the liquid ammonia irrigation area belongs to a major hazard source, and the coal-fired power plant is required to treat the liquid ammonia tank area. The power plant has no proper ammonia water source after treatment.
The scattered liquid ammonia steel cylinders are not suitable for being used as a dispensing mode of the ammonia water of the power plant for a long time due to the safety of transportation, storage and operation.
SUMMERY OF THE UTILITY MODEL
The utility model provides an ammonia distribution system to realize the safety of power plant's aqueous ammonia and deposit and carry.
In order to achieve the above object, the embodiment of the present invention provides an ammonia distribution system, including:
ammonia water storage equipment and demineralized water storage equipment;
the ammonia water dosing tank is provided with a first liquid inlet and a second liquid inlet, the first liquid inlet is hermetically connected with the ammonia water storage equipment through a first electric control valve, and the second liquid inlet is hermetically connected with the desalted water storage equipment through a second electric control valve;
the first liquid level sensor is arranged in the ammonia water dosing tank and used for collecting the liquid level of liquid in the ammonia water dosing tank;
the main control module is respectively connected with the first electric control valve, the second electric control valve and the first liquid level sensor in an electric connection mode, and the main control module is used for determining an ammonia water target liquid level and a desalted water target liquid level in the ammonia water dosing tank according to the target dosing information, the liquid level collected by the first liquid level sensor and the ammonia water target liquid level control, the first electric control valve is opened and closed, and the first liquid level sensor collects the liquid level and the desalted water target liquid level control, and the second electric control valve is opened and closed.
Optionally, the ammonia dispensing system further comprises: and the electric stirrer is arranged in the ammonia water dispensing box and is electrically connected with the main control module, and the electric stirrer is used for stirring under the control of the main control module.
Optionally, the ammonia dispensing system further comprises: the conductivity meter is arranged in the ammonia water dispensing box and is electrically connected with the main control module, and the conductivity meter is used for detecting the conductivity of the liquid in the ammonia water dispensing box under the control of the main control module.
Optionally, the aqueous ammonia storage device comprises: the ammonia water storage tank is provided with a first opening, a second opening and a third opening, wherein the first opening is connected with the ammonia water tank truck in a sealing mode through an ammonia conveying pipeline;
the ammonia unloading pipeline comprises two identical ammonia unloading sub-pipelines which are arranged in parallel, the ammonia unloading sub-pipelines comprise a first stop valve, a first check valve and an ammonia unloading pump which are sequentially arranged, and the ammonia unloading pump is connected with the ammonia tank truck in a closed manner;
the breathing medicine box is provided with an air inlet, a liquid outlet and a third liquid inlet, the air inlet is connected with the second opening through a second stop valve, and the air inlet is used for collecting ammonia gas volatilized from the ammonia water storage tank; the third liquid inlet is connected with the desalted water storage equipment through a third stop valve, and the liquid inlet is used for receiving input desalted water; and the liquid discharge port is connected with the third opening through a fourth stop valve and is used for discharging the mixed liquid of the ammonia gas and the demineralized water in the breathing medicine tank into the ammonia water storage tank.
Optionally, the ammonia water storage device further comprises a fifth stop valve, and the fifth stop valve is located between the air inlet and the second stop valve, or between the second stop valve and the second opening.
Optionally, the ammonia storage tank is further provided with a fourth opening and a fifth opening, the fourth opening is used for connecting a normally-closed valve, and the fifth opening is used for connecting a blowdown valve.
Optionally, the ammonia dispensing system further comprises: the ammonia water storage tank is further provided with a sixth opening, the sixth opening is connected with the first liquid inlet of the ammonia water dosing tank through the first electric control valve, and the sixth stop valve is connected with the first electric control valve in parallel.
Optionally, the ammonia dispensing system further comprises: the pumping unit comprises a normally closed ammonia water delivery pump and a normally open ammonia water delivery pump, the normally closed ammonia water delivery pump and the normally open ammonia water delivery pump are arranged in parallel and are all used for pumping the target dosage in the ammonia water dosage box to a condensate water dosing box and/or a water supply dosing box.
Optionally, the ammonia dispensing system further comprises: the output port of the pumping unit is sequentially connected with the third electric control valve, the fourth electric control valve and the condensed water ammonia dosing tank; the output port of the pumping unit is sequentially connected with the third electric control valve, the fifth electric control valve and the water-feeding ammonia dosing tank, and the third electric control valve, the fourth electric control valve and the fifth electric control valve are all electrically connected with the master control module.
Optionally, the ammonia dispensing system further comprises: the second liquid level sensor is arranged in the condensed water ammonia-adding chemical dosing tank and is used for detecting the liquid level of liquid in the condensed water ammonia-adding chemical dosing tank;
the third liquid level sensor is arranged in the water supply and ammonia adding chemical dosing tank and is used for detecting the liquid level of liquid in the water supply and ammonia adding chemical dosing tank; and the second liquid level sensor and the third liquid level sensor are electrically connected with the main control module.
Optionally, the main control module is further configured to control the third electronic control valve to be opened according to a first target liquid level of the first liquid level sensor, and control the third electronic control valve to be closed according to a second target liquid level of the first liquid level sensor, where the first target liquid level is a liquid level of the target dispensing, and the second target liquid level is a lowest liquid level of the ammonia water dispensing box.
The utility model discloses a set up aqueous ammonia storage device, demineralized water storage device and aqueous ammonia and join in marriage the medical kit to and level sensor and host system, so that get into the aqueous ammonia that the aqueous ammonia in the aqueous ammonia joined in marriage the medical kit and be the aqueous ammonia of certain concentration, but the liquid ammonia gas, avoided storage, transportation process explosion risk. The main control module can determine the target liquid level of the ammonia water and the target liquid level of the desalted water in the ammonia water dosing tank according to the target dosing information, controls the opening and closing of the first electric control valve according to the liquid level acquired by the first liquid level sensor and the target liquid level of the ammonia water, and controls the opening and closing of the second electric control valve according to the liquid level acquired by the first liquid level sensor and the target liquid level of the desalted water, so that the required ammonia water amount and the required desalted water amount can be directly set according to the target dosing information, whether the ammonia water amount in the ammonia water dosing tank reaches the required ammonia water amount and whether the desalted water amount reaches the required desalted water amount can be determined according to whether the liquid level information in the ammonia water dosing tank reaches the target liquid level, the judging steps are simple and clear, the whole process is remote automatic control, manual operation in a dosing workshop, the casualties are reduced.
Drawings
FIG. 1 is a schematic diagram of an ammonia distribution system according to an embodiment of the present invention;
FIG. 2 is a block diagram of an ammonia distribution system in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
FIG. 1 is a schematic structural diagram of an ammonia distribution system according to an embodiment of the present invention. As shown in fig. 1 and 2, the ammonia distribution system comprises: the system comprises ammonia water storage equipment 1, demineralized water storage equipment 2, an ammonia water dosing tank 3, a first liquid level sensor 4 and a main control module 5.
The ammonia water dosing box 3 is provided with a first liquid inlet E and a second liquid inlet F, the first liquid inlet E is hermetically connected with the ammonia water storage equipment 1 through a first electric control valve 6, and the second liquid inlet F is hermetically connected with the desalted water storage equipment 2 through a second electric control valve 7; the first liquid level sensor 4 is arranged in the ammonia water dosing tank 3 and is used for collecting the liquid level of liquid in the ammonia water dosing tank 3; the main control module 5 is respectively electrically connected with the first electric control valve 6, the second electric control valve 7 and the first liquid level sensor 4, the main control module 5 is used for determining an ammonia water target liquid level and a demineralized water target liquid level in the ammonia water dosing tank 3 according to target dosing information, the first electric control valve 6 is controlled to be opened and closed according to the liquid level acquired by the first liquid level sensor 4 and the ammonia water target liquid level, and the second electric control valve 7 is controlled to be opened and closed according to the liquid level acquired by the first liquid level sensor 4 and the demineralized water target liquid level.
It should be noted that the target dispensing information may include a target dispensing concentration, where the target dispensing concentration may be determined according to an actual demand (preferably 1.3%), and the ammonia water concentration in the ammonia water storage device is stronger than the target dispensing concentration (preferably 25%), and further, the ammonia water with a concentration of 25% in the ammonia water storage device needs to be diluted to 1.3% ammonia water, that is, the dispensing in the ammonia water dispensing box 3 is qualified.
The target dispensing information may include a target dispensing volume (which may be set according to actual demand) and a bottom area of the ammonia water dispensing tank 3. Wherein, the ammonia water dosing tank 3 can be a cylindrical barrel. When the target dispensing volume and the bottom area of the ammonia water dispensing tank 3 are determined, the target liquid level height of the target dispensing of the volume in the ammonia water dispensing tank 3 can be determined. In addition, after the target dispensing concentration, the ammonia water concentration in the ammonia water storage device 1 and the target dispensing volume are determined, it can be determined that the dispensing of the dispensing target dispensing volume and the target dispensing concentration requires the volume of the ammonia water in the ammonia water storage device 1; thus, the target liquid level height of the ammonia water can be determined by combining the bottom area of the ammonia water dosing tank 3; and determining the target liquid level height of the desalted water by combining the target liquid level height of the target dosage, wherein the sum of the target liquid level height of the ammonia water and the target liquid level height of the desalted water is approximately equal to the target liquid level height of the target dosage. It should be noted that the target dispensing information may be prestored in the main control module 5.
The working principle of the system is thus as follows: the main control module 5 can be a DCS controller, an operator inputs required target dispensing concentration and target dispensing volume through the main control module 5, and after calculation, the main control module 5 determines the target liquid level height of ammonia water and the target liquid level height of demineralized water and controls the first electric control valve 6 to be opened; when the first liquid level sensor 4 in the ammonia water dosing tank 3 detects that the liquid level of the liquid in the ammonia water dosing tank 3 reaches the target liquid level height of the ammonia water, the first electric control valve 6 is controlled to be closed, and the second electric control valve 7 is controlled to be opened at the same time; when the first liquid level sensor 4 in the ammonia water dosing tank 3 detects that the liquid level of the liquid in the ammonia water dosing tank 3 reaches the target liquid level height of the desalted water, the second electric control valve 7 is controlled to be closed, so that the dosing concentration in the ammonia water dosing tank 3 reaches the target dosing concentration.
Consequently, whole journey need not manual operation, and full-automatic dispenses, regards the liquid level as electric control valve's control parameter, easy operation to dilute the aqueous ammonia of certain concentration for the aqueous ammonia of target concentration, need not to convert liquid ammonia into the ammonia again, mix ammonia and demineralized water and join in marriage for the aqueous ammonia again, avoided a large amount of exothermic processes, thereby factor of safety wholly improves.
Optionally, as shown in fig. 1 and fig. 2, the ammonia distribution system further includes: electric stirrer 8, electric stirrer 8 sets up in aqueous ammonia dosing tank 3 to be connected with host system 5 electricity, electric stirrer 8 is used for stirring under host system 5's control.
It can be understood that after the main control module 5 controls the first electric control valve 6 and the second electric control valve 7 to be opened and closed according to the target dispensing information, the target dispensing is prepared in the ammonia water dispensing box 3, and in order to enable the ammonia water and the demineralized water to be mixed more uniformly, the electric stirrer 8 is opened to stir the dispensing in the ammonia water dispensing box 3. The stirring time may be determined as the case may be, and is preferably 5 min. That is, after the electric stirrer 8 stirs for 5min, the main control module 5 controls the electric stirrer 8 to stop.
Optionally, as shown in fig. 1 and fig. 2, the ammonia distribution system further includes: the conductivity meter 9 is arranged in the ammonia water dosing box 3 and is electrically connected with the main control module 5, and the conductivity meter 9 is used for detecting the conductivity of the liquid in the ammonia water dosing box 3 under the control of the main control module 5.
It can be understood that, after the main control module 5 controls the electric stirrer 8 to stop for a period of time (preferably 5min), the dosage in the ammonia water dosing tank 3 is uniformly mixed, and at this time, the conductivity meter 9 is controlled to detect the conductivity of the liquid in the ammonia water dosing tank 3 more accurately. Therefore, an operator can determine whether the conductivity of actual dispensing in the ammonia water dispensing box 3 conforms to the conductivity of target dispensing according to the conductivity detected by the conductivity meter 9, and the effect of monitoring the dispensing concentration in the ammonia water dispensing box 3 is achieved.
If the matching is true, the dispensing is qualified; if the difference is not satisfied, the operator can revise the ammonia water target liquid level or the demineralized water target liquid level in the target dispensing information again in the current dispensing process or the next dispensing process, so that the main control module 5 dispenses according to the revised ammonia water target liquid level or the demineralized water target liquid level, and the actual dispensing information later conforms to the target dispensing information.
It should be noted that, in order to prevent explosion, the ammonia water storage device is used to store ammonia water in the present embodiment, and the ammonia water storage device in the present embodiment is explained in detail below.
Alternatively, as shown in fig. 1, the aqueous ammonia storage apparatus includes: the ammonia water storage tank 10 is provided with a first opening d, a second opening b and a third opening e, wherein the first opening d is hermetically connected with the ammonia tank wagon 11 through an ammonia unloading pipeline;
the ammonia unloading pipeline comprises two identical ammonia unloading sub-pipelines which are arranged in parallel, the ammonia unloading sub-pipelines comprise a first stop valve 12, a first check valve 13 and an ammonia unloading pump 14 which are arranged in sequence, and the ammonia unloading pump is connected with the ammonia tank car 11 in a sealing way;
the breathing medicine box 15 is provided with an air inlet B, a liquid outlet A and a third liquid inlet C, the air inlet B is connected with the second opening B through a second stop valve 16, and the air inlet B is used for collecting ammonia gas volatilized by the ammonia water storage tank 10; the third liquid inlet C is connected with the desalted water storage equipment 2 through a third stop valve 17 and is used for receiving input desalted water; the liquid discharge port a is connected to the third port e through the fourth stop valve 18, and is used for discharging the mixed liquid of the ammonia gas and the demineralized water in the breathing medicine box 18 to the ammonia water storage tank 10.
That is to say, the concentration of prestoring is 25% aqueous ammonia in the aqueous ammonia holding vessel 10, because there is the volatilization of ammonia in the aqueous ammonia holding vessel 10, it is long-lived, easily cause the increase of jar interior atmospheric pressure, therefore, through the setting of breathing medical kit 15, make volatile ammonia get into breathing medical kit 15, and dissolve through the demineralized water, flow back to in the aqueous ammonia holding vessel 10 at last, both can not discharge the ammonia to operational environment, the polluted environment, also can not cause the waste of material, wherein, install two and unload the ammonia pump, realize supplying outside the on-the-spot totally closed ammonia of ammonia basin car, and through the setting of breathing medical kit 15, make the aqueous ammonia holding vessel 10 when unloading ammonia and going out ammonia, the liquid level is not undulant to a great extent, and the volatile ammonia in the jar can absorb not reveal. One of the two ammonia unloading sub-pipelines can also be used as a standby pipeline, and when the other pipeline breaks down, the standby pipeline is started and normal ammonia unloading and other operations are carried out.
Optionally, the ammonia storage device 1 further includes a fifth cut-off valve 19, and the fifth cut-off valve 19 is located between the gas inlet B and the second cut-off valve 16, or between the second cut-off valve 16 and the second opening B.
As shown in fig. 1, in this embodiment, the fifth stop valve 19 is located between the second opening b and the second stop valve 16. When the second stop valve 16 breaks down and needs to be repaired and dismantled, the fifth stop valve 19 can be closed to isolate the ammonia tank, so that ammonia leakage is avoided.
Optionally, the ammonia storage tank 10 is further provided with a fourth opening a for connecting the normally-closed valve 20 and a fifth opening c for connecting the blowdown valve 21.
That is, the normally closed valve 20 and the blow-off valve 21 can be opened during maintenance or cleaning, so that maintenance and cleaning are facilitated, and the service life is prolonged.
Optionally, as shown in fig. 1, the ammonia distribution system further comprises: the sixth stop valve 22 and the ammonia water storage tank 10 are further provided with a sixth opening f, the sixth opening f is connected with the first liquid inlet E of the ammonia water dosing tank 3 through the first electric control valve 6, and the sixth stop valve 22 is connected with the first electric control valve 6 in parallel.
Furthermore, when the first electric control valve 6 has an electric control fault, the ammonia water inlet amount can be controlled through a manual valve, namely the sixth stop valve 22, so that the problem that the whole equipment cannot operate due to the fault of the first electric control valve 6 is avoided.
Optionally, as shown in fig. 1, the ammonia distribution system further includes a seventh stop valve 34 and an eighth stop valve 35, wherein the seventh stop valve 34 and the eighth stop valve 35 are respectively disposed on two sides of the first electrically controlled valve 6 and are both normally open valves, and when the first electrically controlled valve 6 fails and is maintained, the seventh stop valve 34 and the eighth stop valve 35 are closed to prevent the ammonia water in the ammonia water storage tank 10 from leaking and the ammonia water in the ammonia water dosing tank 3 from flowing back, so that the bypass manual valve, i.e., the sixth stop valve 22, can be opened to control the amount of ammonia water.
Optionally, as shown in fig. 1, the ammonia distribution system further comprises: and the pumping unit 23 comprises a normally-closed ammonia water delivery pump 24 and a normally-open ammonia water delivery pump 25, the normally-closed ammonia water delivery pump 24 and the normally-open ammonia water delivery pump 25 are arranged in parallel, and are both used for pumping the target dosage in the ammonia water dosage box 3 to a condensed water dosage box 27 and/or a water supply dosage box 28.
Wherein, when normally opening aqueous ammonia delivery pump 25 for carrying the aqueous ammonia at every turn, the delivery pump of often using, another is the stand-by pump, when normally opening aqueous ammonia delivery pump 25 breaks down or need overhaul, starts normally closing aqueous ammonia delivery pump 24, avoids because delivery pump trouble influences entire system's operation, and the example in figure 1 is only the utility model discloses an example, normally opening aqueous ammonia delivery pump 25 does not do specific restriction with the position of normally closing aqueous ammonia delivery pump 24. And the two can be switched periodically and stand by each other.
Optionally, as shown in fig. 1 and fig. 2, the ammonia distribution system further includes: a third electric control valve 26, a fourth electric control valve 29 and a fifth electric control valve 30, wherein the output port of the pumping unit 23 is sequentially connected with the third electric control valve 26, the fourth electric control valve 29 and the condensed water ammonia dosing tank 27; an output port of the pumping unit 23 is sequentially connected with a third electric control valve 26, a fifth electric control valve 30 and a water-feeding and ammonia-adding dosing tank 28, and the third electric control valve 26, a fourth electric control valve 29 and the fifth electric control valve 30 are electrically connected with the main control module 5.
Optionally, as shown in fig. 1 and fig. 2, the ammonia distribution system further includes: a second liquid level sensor 32, the second liquid level sensor 32 being provided in the condensed water ammonia adding tank 27, and being configured to detect a liquid level of the liquid in the condensed water ammonia adding tank 27;
a third liquid level sensor 33, the third liquid level sensor 33 being provided in the feedwater-and-ammonia-feeding tank 28 and detecting a liquid level of the liquid in the feedwater-and-ammonia-feeding tank 28; the second liquid level sensor 32 and the third liquid level sensor 33 are both electrically connected with the main control module 5.
That is, the condensate ammonia adding tank 27 is provided with the second liquid level sensor 32, and the feed ammonia adding tank 28 is provided with the third liquid level sensor 33. It is understood that when the second liquid level sensor 32 detects that the liquid level in the condensate ammonia dosing tank 27 is lower than the first preset liquid level (preferably 10cm), or the third liquid level sensor 33 detects that the feed water ammonia dosing tank 28 is lower than the first preset liquid level (preferably 10cm), or both liquid levels are lower than the first preset liquid level (preferably 10cm), it indicates that the condensate ammonia dosing tank 27 or the feed water ammonia dosing tank 28 needs to be dosed. It should be noted that the system may further include a reminding module (not shown in the figure), wherein the reminding module is electrically connected to the main control module 5, and the reminding module may be disposed in the DCS control chamber, so as to remind the worker to input a dispensing instruction when the condensed water ammonia dosing tank 27 or the water supply ammonia dosing tank 28 needs to be dosed, and the main control module 5 controls the first electric control valve 6 and the second electric control valve 7 to perform dispensing operation. The reminding module can be a buzzing warning sound or a light flashing.
Optionally, the main control module 5 is further configured to control the third electronic control valve 26 to open according to a first target liquid level of the first liquid level sensor 4, and control the third electronic control valve 26 to close according to a second target liquid level of the first liquid level sensor 4, where the first target liquid level is a target dispensing liquid level, and the second target liquid level is a lowest liquid level of the ammonia water dispensing tank 3. The first target liquid level is specifically determined based on the amount of the condensed water ammonia adding tank 27 or the feed water ammonia adding tank 28 to which the condensed water is added.
It can be understood that, after the liquid level detected by the first liquid level sensor 4 is the first target liquid level, the third electronic control valve 26 is controlled to be opened, and the normally-open ammonia water delivery pump 25 is simultaneously started, and the fourth electronic control valve 29 and/or the fifth electronic control valve 30 are controlled to be opened, so that the dispensed water in the ammonia water dispensing box 3 is delivered to the condensed water ammonia adding box 27 and/or the feedwater ammonia adding box 28, and after the liquid level detected by the first liquid level sensor 4 is the second target liquid level, the normally-open ammonia water delivery pump 24 is controlled to be closed, the third electronic control valve 26 is controlled to be closed, and the fourth electronic control valve 29 and/or the fifth electronic control valve 30 are controlled.
Wherein, the second target liquid level is preferably 10cm to guarantee that the ammonia water delivery pump does not empty, and cavitation occurs to damage equipment.
Further, when the second liquid level sensor 32 detects that the liquid level in the condensate ammonia adding tank 27 is higher than the second preset liquid level (the highest liquid level in the condensate ammonia adding tank 27) or the third liquid level sensor 33 detects that the liquid level in the feed ammonia adding tank 28 is higher than the third preset liquid level (the highest liquid level in the feed ammonia adding tank 28) before the condensed water ammonia adding tank 27 and/or the feed ammonia adding tank 28 are added with the liquid and the liquid level detected by the first liquid level sensor 4 has not yet reached the second target liquid level, the normally-open ammonia water transfer pump 24 is controlled to be turned off, thereby preventing the operator from performing an erroneous operation and preventing the feed tank from overflowing due to the fact that the input command for dispensing is higher than the first target liquid level.
Specifically, when the liquid level in any one of the condensed water ammonia adding tank 27 and/or the water supply ammonia adding tank 28 is lower than a preset liquid level (10cm), an operator in the DCS control room is prompted to perform an operation of inputting target dispensing information; after the instruction is input, the main control module 5 opens the first electric control valve 6 according to the target dispensing information; when the liquid level of the ammonia water in the ammonia water dosing tank 3 reaches the target liquid level of the ammonia water, controlling the first electric control valve 6 to be closed, and simultaneously starting the second electric control valve 7; when the liquid level in the ammonia water dosing tank 3 reaches a target liquid level (liquid level height corresponding to a target dosing volume), controlling the second electric control valve 7 to be closed, and simultaneously controlling the electric stirrer 8 to be opened; controlling the electric stirrer 8 to stir for 5min and then closing; after standing for 5min, the main control module 5 controls the conductivity meter to detect the conductivity in the ammonia water dosing tank 3; when the actual conductivity is consistent with the target conductivity, the third electric control valve 26 is controlled to be opened; then, the normally-open ammonia water delivery pump 25 is started, and the fourth electric control valve 29 and/or the fifth electric control valve 30 are/is controlled to be opened, so that the dispensed medicines in the ammonia water dosing box 3 are delivered to the condensed water dosing box 27 and/or the water supply dosing box 28; and after the liquid level detected by the first liquid level sensor 4 is the second target liquid level height, controlling the normally-open ammonia water delivery pump 24 to be closed; then the third electric control valve 26 is controlled to be closed; and then controls the fourth electronically controlled valve 29 and/or the fifth electronically controlled valve 30 to close.
In addition, after the ammonia water dosing tank 3 dispenses the medicine, the liquid level of the ammonia water in the ammonia water storage tank 10 drops, and it should be noted that a transparent strip with scales can be arranged on the side wall of the ammonia water storage tank 10, the liquid level of the ammonia water storage tank 10 can be displayed in real time, and when the liquid level is lower than a certain liquid level, an operator is reminded to contact with the ammonia tank truck 11 to supply the product and add the ammonia water into the ammonia water storage tank 10 through the ammonia discharge pump 14.
It should be noted that the transparent bar with scale on the ammonia water storage tank 10 may also be a liquid level sensor, and is electrically connected to the main control module 5, so that whether ammonia water is added to the ammonia water storage tank 10 in the DCS control room can be scheduled.
The first, second, third, fourth and fifth electrically controlled valves may be solenoid valves, and in addition, the electrically controlled valves may be replaced with pneumatic valves.
In addition, LT in fig. 1 refers to an abbreviation of a Liquid level transmitter (Liquid level transmitter), which is one of the Liquid level sensors.
Wherein, the ammonia storage tank 10 can be a stainless steel tank body (preferably 10 m) with optional volume for field use3To 20m3)。
Therefore, the utility model is not provided with a liquid ammonia tank, thereby avoiding major hazard sources and reducing accident safety risks; the manual pouring of the chemicals by operators is not needed, the direct contact of the workers with the concentrated ammonia water is avoided, the personal injury to the workers can be reduced, and the personal accident risk is reduced; the labor input can be saved, and the labor cost can be reduced by 20 ten thousand yuan/year. The automatic medicine dispensing system has constant concentration and has great assistance to the medicine adding control and the steam-water quality control of the unit.
To sum up, the utility model discloses a set up aqueous ammonia storage device, demineralized water storage device and aqueous ammonia dosing tank, and level sensor and host system, so that the aqueous ammonia that gets into in the aqueous ammonia dosing tank is the aqueous ammonia of certain concentration, and not ammonia, avoid exploding, and host system can confirm aqueous ammonia target liquid level and demineralized water target liquid level in the aqueous ammonia dosing tank according to the target information of dispensing, open and close according to the liquid level and aqueous ammonia target liquid level control first electric control valve that first level sensor gathered, and open and close according to the liquid level and demineralized water target liquid level control second electric control valve that first level sensor gathered, thereby can directly dispense information according to the target, set up required ammonia volume and required demineralized water volume, and whether reach the target liquid level according to the liquid level information in the aqueous ammonia dosing tank, whether the ammonia amount in the ammonia water dosing tank reaches the required ammonia amount and whether the desalted water amount reaches the required desalted water amount is determined, the judging steps are simple and clear, the whole process is remote control, manual operation in a dosing workshop is not needed, direct contact of workers with ammonia is avoided, and casualties are reduced.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (11)
1. An ammonia dispensing system, comprising:
ammonia water storage equipment and demineralized water storage equipment;
the ammonia water dosing tank is provided with a first liquid inlet and a second liquid inlet, the first liquid inlet is hermetically connected with the ammonia water storage equipment through a first electric control valve, and the second liquid inlet is hermetically connected with the desalted water storage equipment through a second electric control valve;
the first liquid level sensor is arranged in the ammonia water dosing tank and used for collecting the liquid level of liquid in the ammonia water dosing tank;
the main control module is respectively connected with the first electric control valve, the second electric control valve and the first liquid level sensor in an electric connection mode, and the main control module is used for determining an ammonia water target liquid level and a desalted water target liquid level in the ammonia water dosing tank according to the target dosing information, the liquid level collected by the first liquid level sensor and the ammonia water target liquid level control, the first electric control valve is opened and closed, and the first liquid level sensor collects the liquid level and the desalted water target liquid level control, and the second electric control valve is opened and closed.
2. The ammonia dispensing system of claim 1, further comprising: and the electric stirrer is arranged in the ammonia water dispensing box and is electrically connected with the main control module, and the electric stirrer is used for stirring under the control of the main control module.
3. The ammonia dispensing system of claim 1, further comprising: the conductivity meter is arranged in the ammonia water dispensing box and is electrically connected with the main control module, and the conductivity meter is used for detecting the conductivity of the liquid in the ammonia water dispensing box under the control of the main control module.
4. The ammonia distribution system of claim 1, wherein the aqueous ammonia storage device comprises: the ammonia water storage tank is provided with a first opening, a second opening and a third opening, wherein the first opening is connected with the ammonia water tank truck in a sealing mode through an ammonia discharging pipeline;
the ammonia unloading pipeline comprises two identical ammonia unloading sub-pipelines which are arranged in parallel, the ammonia unloading sub-pipelines comprise a first stop valve, a first check valve and an ammonia unloading pump which are sequentially arranged, and the ammonia unloading pump is connected with the ammonia tank truck in a closed manner;
the breathing medicine box is provided with an air inlet, a liquid outlet and a third liquid inlet, the air inlet is connected with the second opening through a second stop valve, and the air inlet is used for collecting ammonia gas volatilized from the ammonia water storage tank; the third liquid inlet is connected with the desalted water storage equipment through a third stop valve and is used for receiving input desalted water; and the liquid discharge port is connected with the third opening through a fourth stop valve and is used for discharging the mixed liquid of the ammonia gas and the demineralized water in the breathing medicine tank into the ammonia water storage tank.
5. The ammonia distribution system of claim 4, further comprising a fifth shut-off valve located between the gas inlet and the second shut-off valve or between the second shut-off valve and the second opening.
6. The ammonia distribution system of claim 4, wherein the ammonia storage tank is further provided with a fourth opening for connecting a normally closed valve and a fifth opening for connecting a blowdown valve.
7. The ammonia dispensing system of claim 4, further comprising: the ammonia water storage tank is further provided with a sixth opening, the sixth opening is connected with the first liquid inlet of the ammonia water dosing tank through the first electric control valve, and the sixth stop valve is connected with the first electric control valve in parallel.
8. The ammonia dispensing system of claim 1, further comprising: the pumping unit comprises a normally closed ammonia water delivery pump and a normally open ammonia water delivery pump, the normally closed ammonia water delivery pump and the normally open ammonia water delivery pump are arranged in parallel and are all used for pumping the target dosage in the ammonia water dosage box to a condensate water dosing box and/or a water supply dosing box.
9. The ammonia dispensing system of claim 8, further comprising: the output port of the pumping unit is sequentially connected with the third electric control valve, the fourth electric control valve and the condensed water ammonia dosing tank; the output port of the pumping unit is sequentially connected with the third electric control valve, the fifth electric control valve and the water-feeding ammonia dosing tank, and the third electric control valve, the fourth electric control valve and the fifth electric control valve are all electrically connected with the master control module.
10. The ammonia dispensing system of claim 8, further comprising: the second liquid level sensor is arranged in the condensed water ammonia-adding chemical dosing tank and is used for detecting the liquid level of liquid in the condensed water ammonia-adding chemical dosing tank;
the third liquid level sensor is arranged in the water supply and ammonia adding chemical dosing tank and is used for detecting the liquid level of liquid in the water supply and ammonia adding chemical dosing tank; and the second liquid level sensor and the third liquid level sensor are electrically connected with the main control module.
11. The ammonia dosing system according to claim 9, wherein the main control module is further configured to control the third electronic control valve to be opened according to a first target liquid level of the first liquid level sensor, and control the third electronic control valve to be closed according to a second target liquid level of the first liquid level sensor, where the first target liquid level is a liquid level of the target dosing, and the second target liquid level is a lowest liquid level of the ammonia water dosing tank.
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|---|---|---|---|
| CN201922118607.0U CN211586121U (en) | 2019-11-29 | 2019-11-29 | Ammonia distribution system |
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| CN201922118607.0U CN211586121U (en) | 2019-11-29 | 2019-11-29 | Ammonia distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110773029A (en) * | 2019-11-29 | 2020-02-11 | 润电能源科学技术有限公司 | Ammonia distribution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110773029A (en) * | 2019-11-29 | 2020-02-11 | 润电能源科学技术有限公司 | Ammonia distribution system |
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