Coal-fired power plant ash conveying system dynamic energy-saving control method based on actual coal quality parameters

A technology for coal-fired power plants and system dynamics, applied in electrical program control, comprehensive factory control, program control, etc., can solve the problems of ash blocking and high energy consumption

Active Publication Date: 2021-07-06

XIAN THERMAL POWER RES INST CO LTD +1

7 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of ash clogging and high energy consumption in the positive pressure dense phase ash conveying system of the existi...

Abstract

The invention discloses a coal-fired power plant ash conveying system dynamic energy-saving control method based on actual coal quality parameters. The method comprises the steps: 1) establishing a unit fire coal real-time coal quality parameter model for an ash conveying system; 2) carrying out an optimal ash falling time control test on the ash conveying system by using the real-time coal quality parameter model of the unit fire coal in the step 1) to obtain an ash falling time control curve of the ash conveying system, which adapts to the dynamic ash flow, of each ash conveying unit; 3) automatically setting the ash falling time of each ash conveying unit according to the ash falling time control curve of the ash conveying system in the step 2), the coal quality parameters of each raw coal bunker and the coal quantity of each coal feeder in combination with the ash falling time control curve of the ash conveying system adapting to the dynamic ash flow; 4) if all the ash conveying units operate normally in the ash conveying process, performing the step 3) circularly; and if an abnormal phenomenon occurs in a certain ash conveying unit, stopping ash falling immediately, and directly performing a fly ash conveying program, meanwhile, automatically settting a safety margin coefficient to give an alarm prompt on a monitoring picture.

Application Domain

Information technology support systemProgramme total factory control

Technology Topic

Process engineeringEnvironmental geology +7

Image

Examples

Experimental program(1)

Example Embodiment

[0027] Embodiment:

[0028] step one:

[0029] Establish a real-time coal quality parameter model for the unit coal-fired units for the ash system (under the system map figure 2 ):

[0030] (1) The coal is coal into the coal field, and the coal species is separated, and the parameters of the coal stack coal by entering the factory:

[0031] Full water M m Received a gray ahead a m , Subscript M is the pile number

[0032] (2) Introducing a coal-fired online microwave moisture meter on the inverted coal belt, two measurements for the total moisture of the coal-fired coal into each coal bin: M ' m And use it to receive the gray length: a ' m.

[0033]

[0034] (3) The coal rate g is carried out in real time according to each coal bin. 1 ~ G 6 T / h, and (2) get real-time coal-fired parameters entering each coal bin, then obtain the coal-fired integrated dynamic ash feature value A 'from the boiler C :

[0035]

[0036] (4) Dynamic ash flow ASH (T / h) of the final entering the tail flue according to the proportion of the grade residue.

[0037]

[0038] (5) A dynamic gray flow ASH '(T / H) of the final entering the ash system is obtained according to the efficiency η of the dust removal system:

[0039] ASH '= η × ASH

[0040] (6) Depending on the design parameters design of the dust removal system:

[0041] The total dynamic gray flow of each lifting unit is ASH '× ρ i;

[0042] The average dynamic gray flow of each of each of the rospent units is (ASH '× ρ i ) / j;

[0043] Single bin pump of each lifting unit is V i;

[0044] The theory of each lime unit is T i0 = Λ i V i / [(ASH '× ρ i ) / j], where λ i Female in the warehouse;

[0045] Step 2:

[0046] At 100%, 90%, 80%, 70%, 60%, 50%, 40%, 30% (such as) unit load, based on "step a" mode-in-model ASH ', the ash system is performed Best drop-gray time control test, namely: 30% of the theoretical time, increase the declining time until 100% of the theoretical declination time, and observe the peak duration of the lime curve (see figure 1 In the delivery time) and the bluff, the system can achieve the longest fall as gray time that the system can achieve, and introduce for safety margin coefficients. Best drop time for this lime unit

[0047] Get the ash system of the ash system that is adapted to dynamic ash flow (for each output gray unit):

[0048]

[0049]

[0050]...

[0051]

[0052] Step three:

[0053] According to the ash time control curve of the ash system that adapts to the dynamic ash flow, the high-level alarm of the warehouse is referred to, determine the fall as gray time of each lost ash unit (see details image 3 )

[0054] (1) According to the coal quality parameters of each original coal bin, the coal amount of the coal coal, combined with the ash system of the active gray flow, automatically sets the falling time of each loss unit.

[0055](2) If the output ash unit is operating normally during the ash (no abnormal phenomena such as the gray, high-level alarm), the cycle is circulated (1).

[0056] (3) If an abnormality such as a gray, high-level alarm occurs, immediately stop the gray, and directly perform fly ash transport procedures, while will safely margin Automatic setting Alarm prompt on the monitor screen.After this cycle is over, continue (1).

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.