CN219469810U - Multi-channel automatic ammonia adding device - Google Patents

Abstract

A multi-channel automatic ammonia adding device. When one closed water ammonia pump needs to supply closed water ammonia for a plurality of units, a manual door or an electric door of the ammonia pump is required to be frequently and manually switched among a plurality of ammonia adding channels, and meanwhile, the starting and the stopping of the ammonia adding pump are manually controlled, so that the condition that closed water ammonia adding is not timely or excessive ammonia adding is easy to occur; and because the closed water ammonia adding pump has no standby pump, when only one closed water ammonia adding pump fails, the closed water ammonia adding pump cannot be added. The utility model is applied to the technical field of condensation water, water supply and ammonia addition of a thermal power plant. The multichannel automatic ammonia adding device comprises a central control computer, wherein the central control computer is respectively connected with an ammonia box conductivity meter, a condensate flow meter, a group of electric doors and a group of valve electric actuating mechanisms, the valve electric actuating mechanisms are connected with an ammonia adding pump, a frequency converter is arranged between the ammonia adding pump and the valve electric actuating mechanisms, and the frequency converter is connected with the central control computer.

Description

Multi-channel automatic ammonia adding device

Technical Field

The utility model belongs to the technical field of condensation water and water supply ammonia in a thermal power plant, and particularly relates to a multichannel automatic ammonia adding device capable of realizing automatic switching ammonia adding at a plurality of ammonia adding points.

Background

In the boiler water treatment process of the thermal power plant, the pH value is regulated to a qualified range by adopting a continuous or intermittent impact type ammonia adding mode for systems such as condensed water, feed water, closed circulation cooling water (hereinafter referred to as closed water) and the like, so that the acidic corrosion of system pipelines caused by lower pH value of the systems is prevented. In a thermodynamic system, a condensate ammonia adding point is arranged on a main pipe of an outlet of a high-speed mixed bed, a special condensate ammonia adding pump is arranged, a 'single machine single pump' continuous ammonia adding mode is adopted, and a standby condensate ammonia adding pump is arranged at the same time, so that the condensate ammonia adding channels of different units can be switched according to operation requirements; the water supply ammonia adding point is arranged on the downpipe of the deaerator, a special water supply ammonia adding pump is arranged, a 'single machine single pump' intermittent ammonia adding mode is adopted, and a standby water supply ammonia adding pump is arranged at the same time, so that the water supply ammonia adding channels of different units can be switched according to the operation requirement; the closed water ammonia adding point is arranged at the outlet of the closed water pump, the standby water ammonia adding pump is also used as the closed water ammonia adding pump, the multi-machine single pump switching and intermittent ammonia adding mode is adopted, and the standby pump is not used.

In general, the condensed water ammonia pump continuously runs, so that the quality of water vapor is qualified, and the water ammonia pump is in a standby state when in shutdown most of the time. When the standby water-feeding ammonia pump is used as the closed water ammonia pump, the closed water ammonia pump needs to intermittently run for 30-50 seconds every 1-2 hours due to the small volume of the closed water tank so as to control the water quality of the closed water to be maintained at the pH value of more than or equal to 9.5 and the electric conductance of less than 30us/cm.

When one closed water ammonia pump needs to supply closed water ammonia for a plurality of units, a manual door or an electric door of the ammonia pump is required to be frequently and manually switched among a plurality of ammonia adding channels, and meanwhile, the starting and the stopping of the ammonia adding pump are manually controlled, so that the condition that closed water ammonia adding is not timely or excessive ammonia adding is easy to occur; and because the closed water ammonia adding pump has no standby pump, when only one closed water ammonia adding pump fails, ammonia cannot be added to the closed water, and the normal operation of the unit is affected.

Disclosure of Invention

The utility model aims to provide a multichannel automatic ammonia adding device.

The above object is achieved by the following technical scheme:

the multichannel automatic ammonia adding device is characterized by comprising a central control computer, wherein the central control computer is respectively connected with an ammonia tank conductivity meter, a condensate flow meter, a group of electric doors and a group of valve electric actuating mechanisms, the valve electric actuating mechanisms are connected with an ammonia adding pump, a frequency converter is arranged between the ammonia adding pump and the valve electric actuating mechanisms, and the frequency converter is connected with the central control computer.

The multi-channel automatic ammonia adding device comprises two or more electric doors, wherein the electric doors are respectively connected with two or more ammonia adding pipelines, respectively correspond to two or more channels, and can be used for adding ammonia at two or more different ammonia adding points.

The multi-channel automatic ammonia adding device is characterized in that the ammonia adding pump is a condensate ammonia adding pump, a condensate standby ammonia adding pump, a water supply standby ammonia adding pump and a closed water ammonia adding pump.

The utility model has the beneficial effects that:

1. according to the utility model, automatic ammonia addition to condensed water, water supply and closed water can be realized according to the interlocking mode of each ammonia adding pump and the electric door and the setting mode of the manual door.

2. The utility model can mutually reserve a plurality of water-supply ammonia pumps and closed water ammonia pumps. Meanwhile, the device has the advantages of simple structure, reasonable design, perfect functions, convenient realization, automatic operation mode adjustment aiming at different application demands, good use effect and convenient popularization and use.

Drawings

Fig. 1 is a schematic diagram of the structure of the present utility model.

Fig. 2 is a schematic view of a power door control window.

Fig. 3 is a schematic diagram of a control window of a condensate ammonia pump.

FIG. 4 is a schematic diagram of a control window for a feed water ammonia pump.

In the figure: 1. ammonia box electric conduction meter 2, condensate flowmeter 3 and central control computer

4. Ammonia pump (b 1, b2, b3, b4, b5, b6 from left to right)

5. Electric door (from left to right, m1, m2, m3, m4, m5, m6, m7, m8, m9, m 10)

6. Valve electric actuator 7 and frequency converter

Detailed Description

Examples

(1) A multichannel automatic ammonia adding device comprises an ammonia adding pump, a frequency converter, a PLC control unit, an electric door, related pipelines and other auxiliary accessories.

(2) The ammonia adding pump comprises, but is not limited to, a sea-king star-hydraulic diaphragm pump, and the output and the lift of the ammonia adding pump can meet the ammonia adding requirements of high-pressure systems of different types of thermal power plant units.

(3) The frequency converter, the model of which includes but is not limited to ABB-ACS355, can be used together with an ammonia adding pump.

(4) The electric door comprises 2 or more electric doors, wherein the electric doors are respectively connected with 2 or more ammonia adding pipelines, respectively correspond to 2 or more channels, and can be used for adding ammonia at 2 or more different ammonia adding points. Each electric door is provided with a manual ON/OFF function, and an interlocking ON/OFF function.

(5) The ammonia adding pump can be divided into a condensed water ammonia adding pump, a condensed water standby ammonia adding pump, a water feeding standby ammonia adding pump and a closed water ammonia adding pump according to different functions.

(6) Setting a ' start ' function, a ' stop ' function and a ' manual ' interlocking ' mode; the operation frequency can be manually set in a manual mode, and the operation frequency can be automatically adjusted according to a formula in a chain mode (frequency=k×real-time flow of condensate water ++conductance of an ammonia tank, k is a coefficient which can be set in an open mode), and the frequency range is 0-50 Hz; in the interlocking mode, the functions of interlocking #1 (interlocking number 1 machine ON/OFF) and interlocking #2 (interlocking number 2 machine ON/OFF) are set, and at most, the functions of interlocking #1 and interlocking #2 can be in the ON position only.

(7) A water supply ammonia pump, a water supply standby ammonia pump, a start function, a stop function and a manual mode, a linkage A mode and a linkage B mode are set; the operation frequency can be manually set in the manual mode, and the operation frequency can be automatically adjusted according to a formula in the chain A mode (frequency=k×real-time flow of condensed water ++conductance of an ammonia tank, k is a coefficient which can be set in an open mode), and the frequency range is 0-50 Hz; the linkage A mode is provided with a linkage A#1 (linkage No. 1 machine ON/OFF) function and a linkage A#2 (linkage No. 2 machine ON/OFF) function, and at most, the linkage A#1 and the linkage A#2 function can only be at an ON position; the closed water pH value of different units can be tracked in the chain B mode; setting a linkage B#1 (linkage No. 1 machine ON/OFF) function and a linkage B#2 (linkage No. 2 machine ON/OFF) function in a linkage B mode, wherein at most 2 linkage B#1 and linkage B#2 functions are at ON positions; the manual setting window of time t is arranged in the chain B mode, and the time setting range is 1-100 seconds.

(8) According to the frequency, the coefficient k and the time t, the frequency, the coefficient k and the time t can be set and stored no matter which operation state the ammonia adding pump is in; if the ammonia adding pump is in an operating state, setting and storing the frequency, the coefficient k and the time t, and then immediately taking effect; if the ammonia pump is in a stop state, when the ammonia pump is started again, the ammonia pump is automatically brought into the last set frequency, coefficient k and time t values.

Examples

A multichannel automatic ammonia adding device comprises an ammonia adding pump, a frequency converter, a PLC control unit, an electric door, a manual door, related pipelines and other auxiliary accessories. b1, b2 and b3 are water-feeding ammonia pumps and also serve as closed water ammonia pumps; b4, b5 and b6 are condensed water ammonia pumps.

(1) When the system is in a manual state, each ammonia adding pump and the electric door are in a manual state, the starting and stopping of the ammonia adding pump and the opening and closing of each electric door can be manually controlled, and the running frequency of each ammonia adding pump can be manually adjusted.

(2) When 2 units are operated, b4 is in the position of linkage-linkage #1 ON, b6 is in the position of linkage-linkage #2 ON, b5 is in the manual stop position, m7 and m10 are in the manual opening state, and m8 and m9 are in the manual closing state. At the moment, b4 and b6 can automatically adjust the operating frequency (frequency=k×real-time flow rate of condensed water/conductance of ammonia tank) according to a formula and respectively maintain the condensed water and water vapor quality of the #1 and #2 units; the coefficient k can be manually modified according to actual operation requirements, so that the purposes of adjusting the water vapor quality ratio conductance (SC) and controlling the pH value of a water vapor system are achieved.

b1 is at the position of the chain A-chain A#1, b3 is at the position of the chain A-chain A#2, m1 and m6 are in a manual opening state, and m2 and m5 are in a manual closing state. At the moment, b1 and b3 can automatically adjust the operating frequency (frequency=k×condensate real-time flow rate +.ammonia tank conductance) according to the formula and respectively maintain the water vapor quality of the #1 and #2 units; the coefficient k can be manually modified according to actual operation requirements, so that the purposes of adjusting the water vapor quality ratio conductance (SC) and controlling the pH value of a water vapor system are achieved. B1, b3 may also be in a manual stop position if b4, b6 are operating sufficiently to maintain acceptable quality throughout the water vapor system, such as condensate, feedwater, etc.

b2 is at linkage B-linkage B#1-linkage B#2, and m3 and m4 are in linkage ON state. When the pH value of the closed water of the #1 unit is less than 9.5, inputting a pulse signal, delaying for 5 minutes to open m3, starting b2 to operate for 30 seconds (the time t can be modified), stopping b2, closing m3, delaying for 5 minutes, and inputting the pulse signal again; when the pH value of the closed water of the #2 machine set is less than 9.5, a pulse signal is input, m4 is opened after 5 minutes of delay, b2 is started to operate for 30 seconds (the time t can be modified), b2 is stopped, m4 is closed, and the pulse signal is input again after 5 minutes of delay. When the conditions of the closed water pH of the #1 and #2 units are simultaneously satisfied, pulse signals are input according to the priority principle of the #1 unit. Therefore, the purpose of automatic switching and ammonia adding of closed water of 2 units is achieved.

(3) When only the #1 unit is operated, B2 is in the linkage B-linkage B #1 position, and m3 is in the linkage ON state. When the pH value of the closed water of the #1 machine set is less than 9.5, a pulse signal is input, m3 is opened after 5 minutes of delay, b2 is started to operate for 30 seconds (the time t can be modified), b2 is stopped, m3 is closed, and the pulse signal is input again after 5 minutes of delay.

When only the #1 unit operates and the B2 fails, the B3 is at the position of the chain B-chain B #1, the m3 is in the chain ON state, the m5 is in the manual ON state, and the m6 is in the manual off state. When the pH value of the closed water of the #1 machine set is less than 9.5, a pulse signal is input, m3 is opened after 5 minutes of delay, b3 is started to operate for 30 seconds (the time t can be modified), b3 is stopped, m3 is closed, and the pulse signal is input again after 5 minutes of delay.

When only the #2 unit operates and the B2 fails, the B1 is at the position of the chain B-chain B #1, the m4 is in the chain ON state, the m2 is in the manual ON state, and the m1 is in the manual off state. When the pH value of the closed water of the #2 machine set is less than 9.5, a pulse signal is input, m4 is opened after 5 minutes of delay, b1 is started to operate for 30 seconds (the time t can be modified), b1 is stopped, m4 is closed, and the pulse signal is input again after 5 minutes of delay.

Therefore, the purpose that 3 water-feeding ammonia pumps can be used as closed water ammonia pumps is achieved.

Claims (3)

1. The multichannel automatic ammonia adding device is characterized by comprising a central control computer, wherein the central control computer is respectively connected with an ammonia tank conductivity meter, a condensate flow meter, a group of electric doors and a group of valve electric actuating mechanisms, the valve electric actuating mechanisms are connected with an ammonia adding pump, a frequency converter is arranged between the ammonia adding pump and the valve electric actuating mechanisms, and the frequency converter is connected with the central control computer.

2. The multi-channel automatic ammonia addition device of claim 1, wherein: the electric door comprises two or more electric doors, two or more ammonia adding pipelines are respectively connected with the electric doors, two or more channels are respectively corresponding to the electric doors, and ammonia can be added at two or more different ammonia adding points.

3. The multi-channel automatic ammonia addition device of claim 1, wherein: the ammonia adding pump is a condensate ammonia adding pump, a condensate standby ammonia adding pump, a water supply standby ammonia adding pump and a closed water ammonia adding pump.