A kind of wet scraper slag fishing machine water level balance control method

A technology of water level balance and control method, applied in liquid level control, electric controller, control/regulation system, etc., can solve the problems of large water level fluctuation, unstable operation of desulfurization wastewater system, unfavorable safe and stable operation of slag machine, etc. To achieve the effect of no overflow water level balance

Active Publication Date: 2022-07-05
刘雨嫣
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AI Technical Summary

Problems solved by technology

[0003] The water replenishment of the original slag scraper relies on the electric door or regulating door, which is adjusted and controlled according to the radar liquid level measurement value. There are problems such as large water level fluctuations and frequent quick closing of the valve, which is not conducive to the safe and stable operation of the slag scraper.
Especially when the desulfurization wastewater is discharged into the slag extractor, the excess or under-adjustment will cause the unstable operation of the desulfurization wastewater system
[0004] The applicant China Shenhua Energy Co., Ltd. filed an invention patent application CN201810664443.9 in 2018, which discloses a slag removal machine, wherein the slag removal machine includes: a slag removal pool; a main water supply pipeline, its It is equipped with a chain flushing water pipeline, a manual door continuous water supply pipe, an electric door water supply pipeline and an electric door emergency water supply pipeline; a sump; When the liquid level of the slag removal pool drops, the electric door water supply pipeline, the electric door emergency water supply pipeline and the slag machine emergency water supply pipeline are sequentially opened. In this case, it is very easy to cause the problem that the stability of the system operation is reduced

Method used

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  • A kind of wet scraper slag fishing machine water level balance control method
  • A kind of wet scraper slag fishing machine water level balance control method
  • A kind of wet scraper slag fishing machine water level balance control method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] refer to figure 1 , before describing the method of the present embodiment, the structure of the slag removal machine is described first, and the details are as follows:

[0035] The slag removal machine includes a casing 1 , a liquid level gauge 2 for detecting the liquid level in the casing 1 , a water supply pipe 3 for supplementing desulfurization wastewater into the casing 1 , and a slag drop port 4 arranged above the casing 1 . , The scraper unit 5 driven by the chain, the slag bin 6 arranged on the outside of the casing 1 for receiving the solid output from the scraper unit 5, the water supply pipe 3 is provided with a control valve 7; the scraper unit 5 extends to The bottom of the shell 1 is used to transport the solids in the shell 1 to the slag bin 6 .

[0036] It should be noted that the scraper unit 5 is commonly used in the art, and is driven by a chain, and a plurality of scrapers are arranged on the chain.

[0037] This slag removal machine can be rega...

Embodiment 2

[0056] The following describes in detail with specific examples:

[0057] The parameters of the boiler involved in this example are: Shanghai Boiler Factory, 600,000 MW boiler;

[0058] According to the law of conservation of energy: input heat = output heat.

[0059] Input heat: slag substitution heat, radiant heat of furnace (system friction heat is not counted).

[0060] Output heat: water evaporation absorbs heat, slag heat loss and heat dissipation heat loss.

[0061] Refer to Table 1-5 for details.

[0062] 1.1 Slag substitution heat

[0063] Table 1 Slag substitution heat calculation parameter table

[0064]

[0065]

[0066] Based on Table 1, slag substitution heat Q b =G Z ×C Z ×(T z -T 1 ) = 1141221.36(W);

[0067] 1.2 Radiant heat of furnace

[0068] Table 2 Calculation parameters of furnace radiant heat

[0069]

[0070] Based on Table 2, the furnace radiant heat Qr=F t ×C 0 ×φ 12 ×ε 1 ×ε 2 ×(t b -T 1 ) = 30573(w);

[0071] 1.3 Water ev...

Embodiment 3

[0090] Based on the statistics and calculation results of Example 2, combined with the built-in liquid level gauge of the slag removal machine, the opening degree of the control valve can be controlled more accurately.

[0091] Take an example to illustrate: the current working condition is a high load state.

[0092] If the test cycle of the liquid level gauge is once every 10 minutes, then at the 0th minute, the liquid level obtained by the test is h 1 ; At the 10th minute, the liquid level obtained by the test is h 2 ;

[0093] If the calculation result of Embodiment 2 is absolutely accurate, the liquid level in the shell of the slag scraper is controllable and unchanged at any time.

[0094] However, there is always a deviation between the calculation and the actual value. Based on the calculation result of Example 2, the deviation can be controlled within 50mm of the liquid level fluctuation.

[0095] In order to avoid the overall failure of the system caused by the ac...

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Abstract

The invention belongs to the field of thermal power generation, and discloses a method for controlling the water level balance of a wet scraper slag scavenger. The water used in the slag scavenger is desulfurized wastewater; the method is specifically as follows: Step 1: obtaining a slag scavenger The slag in the slag is substituted into the heat Q b , furnace radiant heat Q r , slag heat loss Q w , the heat dissipation and heat loss Q of the tank body of the slag fishing machine s ; Step 2: According to the principle of heat conservation, according to the slag into the heat Q b , furnace radiant heat Q r , slag heat loss Q w , the heat dissipation and heat loss Q of the tank body of the slag fishing machine s Calculate the heat Q absorbed by the evaporation of water in the slag machine e ; Step 3: According to the heat Q absorbed by the evaporation of water e Calculate the amount of evaporated water M; Step 4: Calculate the amount M of desulfurization waste water that needs to be supplemented in the slag removal machine according to the amount of evaporated water M calculated in step 3 1 . Based on the principle of heat conservation, the method can precisely control the water level balance in the shell of the slag removal machine, without frequent switching of the replenishment valve, and ensures the stability of the desulfurization wastewater system.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a water level balance control method for a wet scraper slag scraper. Background technique [0002] The separate slag removal machine equipment only has the function of slag removal. In recent years, with the development of science and technology, the potential of the equipment has been gradually excavated. After technical analysis and demonstration, the waste heat of the slag in the slag removal machine can be used as a heat source for the evaporation of desulfurization wastewater. [0003] The original slag machine water replenishment relies on the electric door or the regulating door, which is adjusted and controlled according to the radar liquid level measurement value. Especially when the desulfurization wastewater is discharged into the slag removal machine, excessive or under-adjustment will lead to unstable operation of the desulfurization wastewater system. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D9/12G05B11/42
CPCG05D9/12G05B11/42
Inventor 刘雨嫣
Owner 刘雨嫣
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