CN215388682U - Water balance optimizing device after ultralow emission of desulfurization system - Google Patents

Abstract

The desulfurization system is an ultra-low emission water balance optimization device. In the prior art, the desulfurization system has unbalanced water balance after ultralow emission, the liquid level of the absorption tower is continuously medium and high, slurry particles in flue gas are increased, the resistance of a wind and smoke system is increased, and a chimney falls off gypsum rain. The utility model comprises the following components: desulfurization absorption tower A (1), desulfurization absorption tower B (3), desulfurization absorption tower A is connected through connecting tube and a set of gypsum escape pump A (7), a set of circulating pump A (12) respectively, and the inlet tube is connected to the top of machine seal A (6) in the gypsum escape pump A, and the wet return is connected to its below, and the wet return divide into two the tunnel, wherein wet return connection trench A (8) all the way, another way wet return with circulating pump A's wet return connect after and through the pipeline with intake water catch bowl (5), filter screen (4) are installed to intake water catch bowl top, intake water catch bowl passes through the pipeline and is connected with technology water tank (2). The utility model is used for the water balance optimization device after ultralow emission of the desulfurization system.

Description

Water balance optimizing device after ultralow emission of desulfurization system

Technical Field

The utility model relates to the technical field of power plant equipment, in particular to a water balance optimization device for a desulfurization system after ultralow emission.

Background

The ultra-low emission back water balance of desulfurization system of prior art coal power plant is unbalanced, and flue gas volume reduces during the unit low-load, and the absorption tower evaporation capacity descends, leads to absorption tower moisturizing and flue gas to carry the evaporation water balance and destroys, and the absorption tower liquid level lasts and keeps the well high liquid level, and the defroster can't be washed, and the defroster resistance increases, and droplet granule collection ability descends, carries the thick liquid particulate matter in the flue gas and increases, causes the unit wind smoke system resistance increase, and the power consumption increases, and the chimney wafts "gypsum rain" problem. This application is through accounting desulfurization absorption tower moisturizing, the water consumption, takes control moisturizing, increases the drainage measure and reaches the water balance purpose of low-load desulfurization system.

Disclosure of Invention

The utility model aims to provide an ultra-low discharge water balance optimizing device for a desulfurization system, which can improve the consumption of circulating water in the desulfurization system, furthest reuse external water sources of an absorption tower, reduce water supplement of the absorption tower, control the water consumption and balance the water of the desulfurization system with low load of a unit.

The above purpose is realized by the following technical scheme:

the utility model provides a water balance optimizing apparatus behind desulfurization system minimum discharge which constitutes and includes: the desulfurization absorption tower A is respectively connected with a group of gypsum discharge pump A and a group of circulating pump A through connecting pipelines, the upper part of a mechanical seal A in the gypsum discharge pump A is connected with a water inlet pipe, a water return pipe is connected below the water return pipe, the water return pipe is divided into two paths, one path of water return pipe is connected with the trench A, the other path of water return pipe is connected with the water return pipe of the circulating pump A and then is connected with the water inlet collecting tank through a pipeline, a filter screen is arranged above the water inlet collecting tank, the water inlet collecting tank is connected with the process water tank through a pipeline, the trench A is connected with the pit A through a pipeline, a motor in the circulating pump A is connected with the speed reducer A, the speed reducer A is connected with the mechanical seal B, the right ends of the mechanical seal B and the speed reducer A are both connected with the water inlet pipe, and the left end of the mechanical seal B is connected with the water return pipe.

Desulfurization system ultralow emission back water balance optimization device, desulfurization absorption tower B be connected with a set of gypsum discharge pump B, a set of circulating pump B through connecting tube respectively, the inlet tube is connected to the top of machine seal in the gypsum discharge pump B, its below connect the wet return and the wet return divide into two the tunnel, wet return connection trench B all the way, another way wet return with circulating pump B's wet return connect the back and through the pipeline with the water catch bowl that intakes connect, circulating pump B in the motor be connected with speed reducer B, speed reducer B be connected with machine seal C, machine seal C speed reducer B's right-hand member all with advance water piping connection, its left end connection wet return, trench B pass through the pipeline and be connected with trench B.

Has the advantages that:

1. the utility model relates to an ultra-low emission water balance optimizing device of a desulfurization system, which controls an external water source of an absorption tower by optimizing and adjusting water replenishing measures in the desulfurization system to meet the water balance requirement of a low-load desulfurization system of a unit, after the water balance of the desulfurization system is stabilized, a demister is periodically washed, the pressure difference of the demister is reduced, the resistance of a wind and smoke system is reduced, the energy consumption is reduced, the liquid drop collecting capacity of the demister is improved, solid particles carried by smoke are reduced, and gypsum rain falling from a chimney is effectively relieved.

2. The utility model improves the consumption of circulating water in a desulfurization system, recycles external water sources of the absorption tower to the maximum extent, reduces the water supplement of the absorption tower, wherein the desulfurization absorption tower B recycles all pump machine sealing water and cooling water which are originally discharged to a pit and enter the absorption tower to be recycled to a process water tank for secondary recycling, the desulfurization absorption tower A recycles pit water of a process building to be subjected to limestone pulping water supplement, and the cooling water of an oxidation fan is recycled to the process water tank for recycling, thereby effectively saving the cost, avoiding sewage discharge and purifying the environment.

3. The utility model can improve the temperature of the flue gas at the outlet of the low-temperature economizer, completely adjust and control the temperature of the flue gas at the inlet of the desulfurization absorption tower of all units to 110 ℃, and improve the evaporation water quantity of the flue gas at the outlet of the desulfurization absorption tower.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Wherein: 1. desulfurization absorption tower A, 2, process water tank, 3, desulfurization absorption tower B, 4, filter screen, 5, water inlet water catch bowl, 6, machine seal A, 7, gypsum discharge pump A, 8, trench A, 9, pit A, 10, machine seal B, 11, speed reducer A, 12, circulating pump A, 13, circulating pump B, 14, speed reducer B, 15, machine seal C, 16, pit B, 17, trench B, 18, gypsum discharge pump B.

The specific implementation mode is as follows:

example 1:

the utility model provides a water balance optimizing apparatus behind desulfurization system minimum discharge which constitutes and includes: a desulfurization absorption tower A1 and a desulfurization absorption tower B3, wherein the desulfurization absorption tower A is respectively connected with a group of gypsum discharge pump A7 and a group of circulating pump A12 through connecting pipelines, a water inlet pipe is connected above a mechanical seal A6 in the gypsum discharge pump A, a water return pipe is connected below the water inlet collecting tank, the water return pipe is divided into two paths, one path of water return pipe is connected with a trench A8, the other path of water return pipe is connected with the water return pipe of the circulating pump A and then is connected with a water inlet collecting tank 5 through a pipeline, a filter screen 4 is arranged above the water inlet collecting tank, the water inlet collecting tank is connected with the process water tank 2 through a pipeline, the trench A is connected with a pit A9 through a pipeline, a motor in the circulating pump A is connected with a speed reducer A11, the speed reducer A is connected with a mechanical seal B10, the right ends of the mechanical seal B and the speed reducer A are both connected with a water inlet pipe, and the left end of the mechanical seal B and the left end of the speed reducer A are connected with a water return pipe.

Example 2:

according to embodiment 1 desulfurization system minimum discharge back water balance optimizing apparatus, desulfurization absorption tower B be connected through connecting tube and a set of gypsum discharge pump B18, a set of circulating pump B13 respectively, the inlet tube is connected to the top of machine seal in the gypsum discharge pump B, its below connect the wet return and the wet return divide into two the tunnel, wet return is connected ditch B17 all the way, another way wet return with circulating pump B's wet return be connected after and through the pipeline with the intake water catch bowl be connected, circulating pump B in the motor with speed reducer B14 be connected, speed reducer B with machine seal C15 be connected, machine seal C, speed reducer B's right-hand member all with advance water piping connection, its left end is connected the wet return, ditch B pass through the pipeline and be connected with pit B16.

Example 3:

the method for optimizing the ultra-low emission water balance optimizing device of the desulfurization system according to embodiment 1 or 2, comprising the steps of:

firstly, when the absorption tower of the desulfurization system runs, the liquid level must be ensured to be between 8 and 8.5 meters, the high liquid level absorption tower overflows and throws slurry, the low liquid level low slurry circulating pump protects tripping, the liquid level balance of the absorption tower is ensured, when the high liquid level of the absorption tower, the desulfurization waste water and the gypsum are discharged, the flushing amount of a demister of the absorption tower is controlled, the water supplement of the absorption tower is reduced, and when the low liquid level is reduced, the flushing of the demister is increased for water supplement;

the process water in the process water tank is pressurized to 0.7MPA by a process water pump, then is supplied to cooling water of each slurry circulating pump speed reducer, slurry circulating machine seal water, machine seal gypsum discharge pump machine seal water and propeller pump machine seal water in a desulfurization site through a process water pipeline, the used process water enters a recovery pipeline, each pump recovery pipeline is converged into a recovery main pipe and is connected to a process water tank for filtration through a recovery water filter, the filtered process water enters a recovery water collecting tank and flows into the process water tank, and then is supplied to the site through the process water pump for recycling.

The ultralow-emission water balance optimization device of the desulfurization system has the following implementation effects in a power plant:

(1) after the water balance is improved and adjusted, the first-stage desulfurization system (the desulfurization absorption tower B) reduces the water supplement entering the absorption tower by 18.9 tons/hour, and the second-stage desulfurization system (the desulfurization absorption tower A) reduces the water supplement entering the absorption tower by 22.5 tons/hour after adjustment, so that the water supplement and consumption balance of the absorption tower during low-load operation of the unit are met.

(2) Before adjustment, the desulfurization accident slurry tank is used as an absorption tower slurry volume adjustment hand, slurry is poured into the accident slurry tank at regular intervals under the low load of the unit, the high load is recycled, the desulfurization accident slurry tank is only used for unit maintenance, and the operation adjustment workload is greatly reduced.

(3) The demister of the absorption tower after the water balance adjustment washes and meets the requirement, the resistance of the demister is reduced by 20-40Pa before the adjustment, and the air and smoke system is adopted.

The utility model provides a desulfurization system absorption tower must guarantee the liquid level when operation between 8-8.5 meters, high liquid level absorption tower overflow is thrown thick liquid, the low serous fluid circulating pump protection tripping operation of low liquid level, consequently must guarantee absorption tower liquid level balance, through discharging desulfurization waste water when absorption tower high liquid level, discharge the gypsum, control absorption tower defroster washing capacity, reduce the absorption tower moisturizing, it washes and carries out the moisturizing to increase the defroster during low liquid level, when organizing ultra-low load adjustment, because of the flue gas volume reduces, the absorption tower is supplied water more outward, lead to the water balance unbalance, the absorption tower overflow, consequently, must control the external water source of absorption tower, each pump machine seals water around the key reduction absorption tower, the cooling water gets into the absorption tower, this technique is the various water sources of pump around the recovery absorption tower, reduce the invalid moisturizing of absorption tower, reduce the absorption tower liquid level.

Claims (2)

1. The utility model provides a water balance optimizing apparatus behind desulfurization system minimum discharge which constitutes and includes: desulfurization absorption tower A, desulfurization absorption tower B, characterized by: desulfurization absorption tower A be connected with a set of gypsum extraction pump A, a set of circulating pump A through connecting tube respectively, gypsum extraction pump A in machine seal A's top connect the inlet tube, the wet return is connected to its below, the wet return divide into two the tunnel, return connection trench A of wherein the same kind, another way wet return with circulating pump A's wet return connect the back and be connected with the water catch bowl that intakes through the pipeline, the water catch bowl top of intaking install the filter screen, the water catch bowl of intaking pass through the pipeline and be connected with the technology water tank, trench A pass through the pipeline and be connected with pit A, motor and speed reducer A in the circulating pump A are connected, speed reducer A and machine seal B be connected, machine seal B right-hand member all with advance water piping connection, the wet return is connected to its left end.

2. The ultra-low emission post-water balance optimization device of the desulfurization system of claim 1, wherein: desulfurization absorption tower B be connected with a set of gypsum extraction pump B, a set of circulating pump B through connecting tube respectively, the inlet tube is connected to the top of machine seal in the gypsum extraction pump B, its below is connected the wet return and the wet return divide into two the tunnel, wet return connection trench B all the way, another way wet return with circulating pump B's wet return connect after and through the pipeline with the water catch bowl that intakes and connect, circulating pump B in motor and speed reducer B be connected, speed reducer B be connected with machine seal C, machine seal C speed reducer B's right-hand member all with advance water piping connection, its left end connection wet return, trench B pass through the pipeline and be connected with pit B.

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