CN111672310B - Standby chain starting method for slurry circulating pump of flue gas desulfurization system - Google Patents
Standby chain starting method for slurry circulating pump of flue gas desulfurization system Download PDFInfo
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- CN111672310B CN111672310B CN202010516470.9A CN202010516470A CN111672310B CN 111672310 B CN111672310 B CN 111672310B CN 202010516470 A CN202010516470 A CN 202010516470A CN 111672310 B CN111672310 B CN 111672310B
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- electric door
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention relates to a standby chain starting method of a slurry circulating pump of a flue gas desulfurization system, wherein the desulfurization system is provided with A, B two slurry circulating pumps, wherein a pump A is an operating pump and is in an operating state, and an electric door 1 at the inlet of the pump A is in a fully open state; the pump B is a standby pump and is in a stop state, the electric door 2 at the inlet of the pump B is in a closed state, and when the control system monitors and judges that the pump A of the running pump trips, the control system can send out the following control instructions and act corresponding equipment. The invention can ensure that the current of the standby pump does not exceed the current in the whole starting process, and is safe and stable. The standby chain starting method is used in a desulfurization site, so that the running number of the slurry circulating pumps can be reduced, a large amount of electric energy is saved, the mechanical loss of equipment can be reduced, and the running production efficiency is improved.
Description
The technical field is as follows:
the invention relates to a standby chain starting method of a slurry circulating pump of a flue gas desulfurization system.
Background art:
in recent years, with the increasing requirements of our country on environmental emission indexes, the flue gas desulfurization technology, namely the FGD technology, is widely applied to thermal power generation projects. Wherein, the wet desulphurization is widely popularized and used due to the advantages of high reaction speed, simple equipment, high desulphurization efficiency and the like. The wet FGD technology is to desulfurize and treat the desulfurization product in a wet state by using a solution or slurry containing an absorbent, and the core equipment of the wet FGD technology is a slurry circulating pump for conveying a reaction solution. On the production site of the high-efficiency desulfurization system, the most ideal situation is as follows: the number of the slurry circulating pumps in the running state just meets the requirements of discharge indexes and running parameters. If such an optimal operation mode is desired, it is necessary that the slurry circulation pump in a standby state can be automatically interlocked immediately after a malfunction trip of the slurry circulation pump in operation. However, in many desulfurization sites, such an automatic start-up scheme cannot be realized. The reason is that: normally, the inlet and outlet of the water pump are respectively provided with an electric door. In order to prevent the current of the backup pump from overflowing in the starting process, the inlet electric door of the backup pump must be in a fully-opened state, and the outlet electric door of the backup pump must be in a fully-closed state, so that the safe starting of the backup pump can be ensured. However, in the industrial design of desulfurization systems, it is common to install a motorized door only at the inlet of the slurry circulation pump. And since the operation medium of the slurry circulation pump for wet desulfurization is limestone slurry, in order to prevent the limestone slurry from coagulating, its inlet electric gate must be closed when the slurry circulation pump is in a stopped state. This makes the stopped slurry circulation pump unable to satisfy the automatic interlock start condition of the conventional backup pump, and thus unable to put into a standby state. Therefore, before a reliable automatic interlocking starting method of the standby pump is not available, on the basis that the discharge index and the operation parameters are met, the operation site usually operates one more slurry circulating pump so as to prevent the discharge index from exceeding the standard and damaging the equipment safety of the desulfurization absorption tower after the operation pump is tripped due to faults. However, such operation would greatly increase the power consumption and mechanical losses of the equipment. Therefore, an optimized, safe and reliable method for starting the backup pump in chain is needed to solve the problem and improve the production efficiency for the desulfurization operation site.
The invention content is as follows:
the invention aims to provide a standby chain starting method for a slurry circulating pump of a flue gas desulfurization system, which can save a large amount of electric energy and reduce the mechanical loss of equipment, thereby greatly improving the operation production efficiency. The technical scheme of the invention is as follows: the desulfurization system is provided with A, B two slurry circulating pumps, wherein the pump A is an operating pump and is in an operating state, and the inlet electric door 1 of the pump A is in a fully open state; the pump B is a standby pump and is in a stop state, the electric door 2 at the inlet of the pump B is in a closed state, and when the control system monitors and judges that the pump A of the running pump trips, the control system can send out the following control instructions and act corresponding equipment: and immediately and automatically opening the standby pump B pump inlet electric door 2 in a linkage manner, automatically starting the pump B in a linkage manner after a B pump inlet electric door 2 closing signal disappears for 10S, and continuously opening the B pump inlet electric door 2 in the process of starting the pump B until the pump B is fully opened.
Each slurry circulating pump operated by the control system is provided with a standby interlocking switch button.
The working principle of the invention is as follows:
in the desulfurization system, a slurry circulation pump in a stopped state is used as a backup pump, and an inlet electric door of the slurry circulation pump is in a closed state. When the control system judges that the slurry circulating pump in operation has fault tripping, the control system can send out the following control instructions and act corresponding equipment: the inlet electric door of the standby pump is automatically opened immediately, and the standby pump is automatically started after the standby pump inlet electric door closing signal disappears for a period of time. Because the electric door at the inlet of the backup pump is opened for a period of time at the moment of starting the backup pump, the slurry flow at the inlet of the backup pump can meet the starting requirement of the backup pump, and the electric door at the inlet is continuously opened until the backup pump is fully opened in the subsequent time after the backup pump is started, so that the current of the backup pump in the whole starting process can be ensured not to exceed the current, and the backup pump is safe and stable. And in the process of tripping the whole operation pump and self-starting the standby pump, the requirements of emission indexes and operation parameters can be ensured all the time, and the equipment safety of the desulfurization absorption tower can be ensured. The time interval between the disappearance moment of the standby pump inlet electric door closing signal and the starting time of the standby pump can be determined according to the actual action travel time of the standby pump inlet electric door and the actual operation parameters of the field standby slurry circulating pump, so that the current of the field standby slurry pump is not overflowed in the starting process.
The invention has the technical effects that:
the number of the slurry circulating pumps running on the desulfurization site just meets the discharge index and the running parameters, other slurry pumps can be put into standby under the stop state, and the electric door at the inlet of the standby pump is in the fully closed state. When a circulating slurry pump which is running on a desulfurization site is tripped due to a fault, firstly, an inlet electric door of a standby pump is automatically and immediately opened in a linkage manner, the standby pump is automatically started after a closing signal of the inlet electric door of the standby pump disappears for a period of time, and in the starting process of the standby pump, the inlet electric door of the standby pump is continuously opened until the standby pump is fully opened.
In the operation picture of the desulfurization system, a 'standby interlocking switch' button is designed for each slurry circulating pump, and an operator can set the slurry circulating pump in a stop state to a standby state through the input of the 'standby interlocking switch' button according to needs. Wherein, control system judges that the condition of operation pump tripping operation has two: 1. the closing state of the running pump disappears; 2. the pump running current is operated to be less than a certain value. If one of the two judgment conditions is met, the operating pump can be judged to be tripped. The time interval between the time when the standby pump inlet electric door closing signal disappears and the time when the standby pump is started can be determined according to the actual action travel time of the standby pump inlet electric door and the actual operation parameters of the field standby slurry circulating pump, so that the current of the field standby slurry pump is not overflowed in the starting process.
Through the practical application of the invention in the operation site, the number of the operation pumps of the slurry circulating pump of the desulfurization system only needs to meet the discharge index and the system operation parameters, and the slurry circulating pump does not need to be started on site at ordinary times so as to prevent the discharge index and the equipment safety from being influenced after the operation pump trips. If the operation pump is tripped due to faults on the site, the standby pump and the inlet electric door thereof can be automatically started in a linkage manner, and the emission index and the safety of the desulfurization absorption tower equipment can be ensured. The operation mode can save a large amount of electric energy and reduce the mechanical loss of equipment, thereby greatly improving the operation production efficiency.
Drawings
Fig. 1 is a main diagram of a flue gas desulfurization system.
FIG. 2 is a block diagram of the logic for the back-up pump B for interlocking the opening of the pump inlet power gate.
FIG. 3 is a block diagram of the pump interlock start logic of the backup pump B.
Detailed Description
As shown in fig. 1, the invention relates to a backup chain start method for slurry circulating pumps of a flue gas desulfurization system, wherein A, B slurry circulating pumps are arranged in the desulfurization system. The pump A is an operating pump and is in an operating state, and the inlet electric door 1 of the pump A is in a fully open state; the pump B is a standby pump and is in a stop state, the electric door 2 at the inlet of the pump B is in a closed state, and when the control system monitors and judges that the pump A of the running pump trips, the control system can send out the following control instructions and act corresponding equipment: first, as shown in fig. 2, the control system determines that there are two conditions for operating pump a to trip: 1. the pump switching-on state of the operating pump A disappears; 2. when the control system judges that the pump A is tripped, the control system immediately and automatically interlocks and opens the pump inlet electric door 2 of the standby pump B; as shown in fig. 3, when the close signal of the B pump inlet electric door 2 disappears for 10S, the control system automatically starts the B pump in a chain manner, and in the process of starting the B pump, the B pump inlet electric door 2 is continuously opened until the B pump inlet electric door is fully opened. In order to realize the control function, firstly, a 'standby interlocking switch' button needs to be designed for each slurry circulating pump on an operation picture of the control system, and an operator can set the slurry circulating pump in a stop state to a standby state through the input of the 'standby interlocking switch' button according to needs.
As shown in fig. 1, in the production operation, the pump a is an operation pump and is in an operation state, and the inlet electric door 1 of the pump a is in a full-open state; the pump B is in a stop state, the electric door 2 at the inlet of the pump B is in a closed state, and a standby interlocking switch button of the pump B is put into use, so that the pump B can be set to a standby state. As shown in fig. 2, if the control system monitors that the pump a has disappeared in the closed state or the pump a has a current less than 5A, the control system can determine that the pump a has tripped, and at this time, the control system immediately sends an instruction of "opening the pump B inlet electric door 2 for the pump" through the control logic. As shown in fig. 3, when the control system monitors that the close signal of the pump B inlet electric door 2 disappears for 10S, the control system can determine that the pump B inlet electric door 2 has started to open and has opened for 10S, and at this time, the control system sends out a command of "starting the pump B of the backup pump" through the control logic. And in the process of starting the pump B, the inlet electric door 2 of the pump B is continuously opened until the pump B is fully opened.
Claims (2)
1. A standby chain starting method for a slurry circulating pump of a flue gas desulfurization system is characterized by comprising the following steps: the desulfurization system is provided with A, B two slurry circulating pumps, wherein the pump A is an operating pump and is in an operating state, and the inlet electric door 1 of the pump A is in a fully open state; the pump B is a standby pump and is in a stop state, the electric door 2 at the inlet of the pump B is in a closed state, and when the control system monitors and judges that the pump A of the running pump trips, the control system can send out the following control instructions and act corresponding equipment: firstly, the control system judges that the tripping condition of the pump A is two: 1. the pump switching-on state of the operating pump A disappears; 2. when the control system judges that the pump A is tripped, the control system immediately and automatically interlocks and opens the pump inlet electric door 2 of the standby pump B; and when the closing signal of the B pump inlet electric door 2 disappears for 10S, the B pump is automatically started in a linkage manner, and in the process of starting the B pump, the B pump inlet electric door 2 is continuously opened until the B pump inlet electric door is fully opened.
2. The method for the standby chain start of the slurry circulating pump of the flue gas desulfurization system according to claim 1, which is characterized in that: each slurry circulating pump under the operation of the control system is provided with a standby interlocking switch button.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010516470.9A CN111672310B (en) | 2020-06-09 | 2020-06-09 | Standby chain starting method for slurry circulating pump of flue gas desulfurization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010516470.9A CN111672310B (en) | 2020-06-09 | 2020-06-09 | Standby chain starting method for slurry circulating pump of flue gas desulfurization system |
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| CN111672310A CN111672310A (en) | 2020-09-18 |
| CN111672310B true CN111672310B (en) | 2022-04-01 |
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| CN112943636B (en) * | 2021-01-29 | 2023-04-07 | 华能国际电力股份有限公司营口电厂 | Rapid starting method for circulating pump of wet desulphurization system |
| CN114272740A (en) * | 2021-12-07 | 2022-04-05 | 广西金川有色金属有限公司 | Desulfurization tower emergency absorption device and use method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020737A (en) * | 2014-05-21 | 2014-09-03 | 国家电网公司 | Slurry circulating pump RB control method of thermal power generating unit |
| CN208244448U (en) * | 2018-03-30 | 2018-12-18 | 国家能源投资集团有限责任公司 | Desulphurization system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6349179B2 (en) * | 2014-07-17 | 2018-06-27 | 三菱日立パワーシステムズ株式会社 | Flue gas desulfurization apparatus and operation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020737A (en) * | 2014-05-21 | 2014-09-03 | 国家电网公司 | Slurry circulating pump RB control method of thermal power generating unit |
| CN208244448U (en) * | 2018-03-30 | 2018-12-18 | 国家能源投资集团有限责任公司 | Desulphurization system |
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