CN212068317U - Integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery and its purification system - Google Patents

Abstract

The utility model discloses an integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery and a purification system thereof. The integrated equipment for desulfurization, dust removal, denitration and waste heat recovery comprises a venturi atomization device, a main body and at least one gas-liquid supplementary hole , flue pipe, spiral plate, and sewage pipe; the purification system of the integrated desulfurization, dust removal, denitrification, and waste heat recovery equipment includes desulfurization, dust removal, denitrification, and waste heat recovery integrated equipment, as well as heat exchange and dust removal devices, gas-water separation equipment system, solid-liquid separation system and multi-substance mixed absorption liquid system. The utility model has a simple and reasonable structure, can process and recycle the flue gas more efficiently, and finally make the flue gas discharge reach the current national environmental protection industry standard.

Description

Integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery and its purification system

technical field

The utility model belongs to the technical field of desulfurization and denitrification equipment in power plants, in particular to an integrated equipment for desulfurization, dust removal, denitration and waste heat recovery and a purification system thereof.

Background technique

The traditional desulfurization, denitration, and dust removal equipment in power plants and their supporting systems mainly include: dust removal equipment and systems, desulfurization equipment and systems, denitration equipment and systems, large chimneys, etc. Reasonable, easy to scale and block; bag dust removal, electrostatic precipitator, desulfurization and denitrification towers have large wind resistance, many failure rates, many supporting equipment, large maintenance workload, huge investment, high operating costs, large floor space and other defects; the most critical Yes, traditional equipment and systems have not fundamentally broken through to solve the bottleneck of fully homogeneous mixing, collision, contact and combined absorption time of flue gas, absorbing liquid and reaction gas, resulting in low efficiency of flue gas treatment, and ultimately flue gas emissions can not reach the national level. The current published environmental protection industry standards.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

The main purpose of the utility model is to solve the defects of the current equipment, such as complex structure, high failure rate, many supporting equipment, large maintenance workload, huge investment, high operating cost, large floor space, etc., and to improve the efficiency of flue gas treatment. A desulfurization, dust removal, denitrification, waste heat recovery integrated equipment and its purification system.

In order to achieve the above purpose, the technical solution provided by the present utility model is: an integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery, the integrated equipment for desulfurization, dust removal, denitration and waste heat recovery includes: a venturi atomization device, a body, At least one gas-liquid supplementary hole, heat exchange medium inlet pipe, heat exchange medium outlet pipe, smoke exhaust pipe, spiral plate, and sewage pipe; the venturi atomization device includes a smoke inlet pipe, a multi-substance mixed absorption liquid inlet, and a reaction gas inlet , Venturi atomizer, atomization inlet and atomization outlet; the smoke inlet pipe, the multi-substance mixed absorption liquid inlet and the reaction gas inlet are placed at the front end of the Venturi atomization device; the rear end of the smoke inlet pipe, the multi-substance mixed absorption liquid The rear end of the inlet and the rear end of the reaction gas inlet are respectively connected with the front end of the atomization inlet; the rear end of the venturi atomization inlet is connected with the venturi atomizer; the rear end of the venturi atomizer is connected with the atomization outlet; The chemical outlet is communicated with the upper end of the body; the lower end of the body is connected with the sewage discharge pipe; the heat exchange medium inlet pipe is communicated with the lower end outer wall of the body; the heat exchange medium outlet pipe is communicated with the upper end outer wall of the body; the smoke exhaust pipe is placed in the middle of the body; The lower end of the smoke pipe is connected with the sewage pipe; the upper end of the smoke pipe protrudes from the top of the main body; the spiral plate is placed between the side wall of the main body and the outer wall of the smoke exhaust pipe; the gas-liquid supplementary hole is opened on the side of the main body and the spiral plate The spiral channel formed between them communicates with each other.

The inlet of the multi-substance mixed absorption liquid and the inlet of the reaction gas are both nozzles.

The rear end of the atomization outlet communicates with the upper end of the body along the tangential direction and communicates with the spiral channel.

The smoke exhaust pipe is a bottom-return smoke exhaust pipe; the smoke exhaust pipe, the spiral plate and the main body are all provided with interlayers, and the interlayers communicate with each other; the interlayer is provided with a heat exchange medium.

The sewage pipe is a water-sealed vertebral sewage pipe.

A purification system with integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery, including integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery; also includes heat exchange and dust removal device, gas-water separation system, solid-liquid separation system and multi-substance mixing The absorption liquid system; the rear end of the heat exchange and dust removal device is connected with the front end of the smoke inlet pipe; the gas-water separation system is connected with the rear end of the smoke exhaust pipe; the solid-liquid separation system is connected with the sewage pipe; the outlet end of the multi-substance mixed absorption liquid system is connected with the The substance mixed absorption liquid inlet is connected.

The multi-substance mixed absorption liquid system includes a water replenishing pipe, an absorption liquid conveying pipe, a mixing tank and a liquid accumulation tank; the water replenishing pipe and the absorption liquid conveying pipe are respectively connected with the mixing tank; the outlet of the mixing tank is connected with the liquid accumulation tank; The substance mixed absorption liquid inlet is connected.

The liquid accumulation pool is connected with the multi-substance mixed absorption liquid inlet through the first liquid pump.

The solid-liquid separation system includes a solid-liquid separation device, a buffer tank, an online automatic filtration device, a sludge solidification device and a waste residue recovery device; the solid-liquid separation device is installed at the lower end of the sewage pipe; the mixed liquid outlet of the solid-liquid separation device is connected to the buffer tank ; The liquid outlet of the buffer tank is connected to the online automatic filtering device; the liquid outlet of the online automatic filtering device is connected to the liquid accumulation tank; the sediment outlet of the solid-liquid separation device and the buffer tank are respectively connected to the sludge solidification device; The liquid outlet of the solidification device is connected with the liquid accumulation pool; the solidified product outlet of the sludge solidification device is connected with the waste residue recovery device.

The liquid outlet of the sludge solidification device is connected to the liquid accumulation tank through the second liquid pump; the sediment outlets of the solid-liquid separation device and the buffer tank are respectively connected to the sludge solidification device through the sludge output device.

The gas-water separation system includes a gas inlet, a purified flue gas outlet, a gas-water separation device and a liquid outlet; the gas inlet is communicated with the exhaust pipe; the gas inlet is connected to one end of the gas-water separation device; the other end of the gas-water separation device and the liquid outlet connected; the upper end of the gas-water separation device is communicated with the exhaust port of the purified flue gas.

The gas inlet is communicated with the exhaust pipe through the induced draft fan.

Features of this utility model:

Compared with the prior art, the integrated equipment for desulfurization, dust removal, denitration, and waste heat recovery and its purification system of the present invention have the following beneficial effects: the integrated equipment for desulfurization, dust removal, denitration, and waste heat recovery and its purification system use gas, Liquid nozzle, Venturi atomization device, spiral plate with interlayer and the body form a forced elongated spiral channel to achieve full heat exchange, homogeneous mixing, collision, contact and delay, and realize the effect of flue gas molecular clusters and multi-substance The mixed absorption liquid and reaction gas molecular groups are homogeneous, fully mixed, collided and contacted, and continue for a certain combination reaction and absorption time, which greatly improves the treatment efficiency and achieves the purpose of completely eliminating harmful gases in the flue gas. In particular, it achieves the purpose of eliminating PM2.5 dust and above dust; due to the spiral channel design with interlayer, the problem of waste heat recovery is well solved, and the heat exchange medium in the interlayer can be water, air, oil, etc. ;The barrier-free design of the water-sealed sewage pipe completely solves the problem of online sewage and sealing of equipment, completely eliminates the possibility of internal fouling and blockage of equipment, and eliminates the probability of shutdown and maintenance due to equipment blockage; its supporting purification system The operation effect of the integrated equipment is fully guaranteed; due to the simple and reasonable structure of the integrated equipment, risks such as air leakage, scaling and blockage are avoided, and the continuous and normal operation of the integrated equipment is ensured, which provides for the realization of the online intelligent operation of the integrated equipment and system. guaranteed. Furthermore, the purpose of integrated equipment and purification system and boiler online intelligent automatic control operation is realized.

Description of drawings:

Fig. 1: The structure schematic diagram of the present utility model.

Detailed ways:

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

Unless expressly stated otherwise, throughout the specification and claims, the term "comprising" or its conjugations such as "comprising" or "comprising" and the like will be understood to include the stated elements or components, and Other elements or other components are not excluded.

Example 1:

As shown in Figure 1:

An integrated equipment 25 for desulfurization, dust removal, denitration and waste heat recovery, including a venturi atomization device, a main body 29, at least one gas-liquid supplementary hole 30, a heat exchange medium inlet pipe 28, a heat exchange medium outlet pipe 27, and a smoke exhaust pipe 5. Spiral plate 6, and sewage pipe 11; Venturi atomization device includes smoke inlet pipe 31, multi-substance mixed absorption liquid inlet 3, reaction gas inlet 23, Venturi atomizer 4, atomization inlet 33 and atomization outlet 32; the smoke inlet pipe 31, the multi-substance mixed absorption liquid inlet 3 and the reaction gas inlet 23 are placed at the front end of the venturi atomization device; the rear end of the smoke inlet pipe 31, the rear end of the multi-substance mixed absorption liquid inlet 3 and the reaction gas inlet The rear end of 23 is connected with the front end of the atomization inlet 33 respectively; the rear end of the venturi atomization inlet 33 is connected with the venturi atomizer 4; the rear end of the venturi atomizer 4 is connected with the atomization outlet 32; the atomization outlet 32 is communicated with the upper end of the body 29; the lower end of the body 29 is connected with the sewage pipe 11; the heat exchange medium inlet pipe 28 is communicated with the outer wall of the lower end of the body 29; the heat exchange medium outlet pipe 27 is communicated with the outer wall of the upper end of the body 29; The middle part of the main body 29; the lower end of the smoke exhaust pipe 5 is connected with the sewage pipe 11; the upper end of the smoke exhaust pipe 5 protrudes from the top of the main body 29; the spiral plate 6 is placed between the side wall of the main body 29 and the outer wall of the smoke exhaust pipe 5, A spiral channel 7 is formed, and the gas-liquid replenishing hole 30 is opened on the side surface of the main body 29 and communicates with the spiral channel 7 formed between the spiral plate 6 .

The multi-substance mixed absorption liquid inlet 3 and the reaction gas inlet 23 are both nozzles.

The rear end of the atomization outlet 32 communicates with the upper end of the main body 29 and communicates with the spiral channel 7 along the tangential direction.

The smoke exhaust pipe 5 is a bottom-return type smoke exhaust pipe; the smoke exhaust pipe 5, the spiral plate 6 and the main body 29 are all provided with an interlayer 26, and the interlayer 26 communicates with each other, and the heat exchange medium in the interlayer 26 can be water, air, oil Wait.

The sewage pipe 11 is a water-sealed vertebral sewage pipe.

The reaction gas inlet 23 is communicated with a gas storage tank or an on-line reaction gas production system.

A purification system with integrated equipment for desulfurization, dust removal, denitration, and waste heat recovery, including desulfurization, dust removal, denitrification, and waste heat recovery integrated equipment 25; it also includes a heat exchange and dust removal device 2, a gas-water separation system, a solid-liquid separation system, and multiple Substance mixed absorption liquid system; the rear end of the heat exchange and dust removal device 2 is connected to the front end of the smoke inlet pipe 31; the front end of the heat exchange dust removal device 2 is connected to the boiler induced draft fan 1; the gas-water separation system is connected to the rear end of the smoke exhaust pipe 5; The separation system is connected with the sewage pipe 11 ; the outlet end of the multi-substance mixed absorption liquid system is connected with the multi-substance mixed absorption liquid inlet 3 .

The multi-substance mixed absorption liquid system includes a water replenishing pipe 21, an absorption liquid conveying pipe 22, an absorption liquid mixing tank 24 and an accumulation pool 20; the water replenishing pipe 21 and the absorption liquid conveying pipe 22 are respectively connected with the absorption liquid mixing tank 24; the absorption liquid mixing tank The outlet of 24 is connected with the liquid accumulation pool 20; the liquid accumulation pool 20 is connected with the multi-substance mixed absorption liquid inlet 3. Water, sulfur and nitrogen oxide absorbents enter the absorption liquid mixing tank 24 through the water replenishing pipe 21 and the absorption liquid conveying pipe 22 respectively, and then enter the liquid accumulation tank 20 after mixing and adjusting the pH value to form the desulfurization and denitration of the power plant boiler flue gas. The multi-substance mixed absorption solution.

The liquid accumulation pool 20 is connected to the multi-substance mixed absorption liquid inlet 3 through the first liquid pump 15 , and the multi-substance mixed absorption liquid is pumped into the atomization inlet 33 of the venturi atomization device through the first liquid pump 15 .

The multi-substance mixed absorption liquid, reaction gas and boiler flue gas after being atomized and mixed by the venturi atomizing device are introduced into the spiral channel 7 in the main body 29 along the tangential direction, and are tangentially spun out from the bottom of the spiral channel 7; The liquid-gas mixture enters the water-sealed vertebral body sewage pipe 11 downward along the tangential direction, the solid-liquid gas mixture is discharged from the water-sealed vertebral body sewage pipe 11 into the solid-liquid separation device 12, and the remaining flue gas enters the lower part with the interlayer. The smoke return type smoke exhaust pipe 5 is discharged; the lower return smoke type smoke exhaust pipe 5 with the interlayer guides the remaining gas into the gas-water separation device 9 through the induced draft fan 10 .

The solid-liquid separation system includes a solid-liquid separation device 12 , a buffer tank 13 , an online automatic filter device 19 , a sludge solidification device 17 and a waste residue recovery device 18 . The solid-liquid separation device 12 is installed at the lower end of the sewage pipe 11, and the lower end of the sewage pipe 11 extends below the liquid level of the multi-substance mixed absorption liquid in the solid-liquid separation device 12 to form a water-sealed sewage discharge, using the principle of liquid pressure to achieve barrier-free The purpose of sewage and sealing equipment, the application of this principle, completely abandons the multiple failures caused by valve switches and the corresponding operating costs, reduces the associated supporting facilities, reduces the difficulty of work, and reduces related investment. Costs and operating expenses provide a guarantee for the realization of online intelligent operation.

The mixed liquid outlet of the solid-liquid separation device 12 is connected to the buffer tank 13; the liquid outlet of the buffer tank 13 is connected to the online automatic filtering device 19; the liquid outlet of the online automatic filtering device 19 is connected to the liquid accumulation tank 20; the solid-liquid separation The sediment outlet of the device 12 and the buffer tank 13 are respectively connected to the sludge solidification device 17 ; the liquid outlet of the sludge solidification device 17 is connected to the sump 20 ;

The liquid outlet of the sludge solidification device 17 is connected to the liquid accumulation tank 20 through the second liquid pump 16, and the absorption liquid discharged from the online automatic filtering device 19 and the sludge solidification device 17 is returned to the liquid accumulation tank 20 for reuse, which saves a lot of money. It also reduces the secondary pollution of the waste liquid; the dehydrated material through the sludge solidification device 17 enters the waste residue recovery device 18 .

The sediment outlets of the solid-liquid separation device 12 and the buffer tank 13 are respectively connected to the sludge solidification device 17 through the sludge output device 14 .

The gas-water separation system includes a gas inlet 35, a purified flue gas outlet 8, a gas-water separation device 9 and a liquid outlet 34; the gas inlet 35 is communicated with the exhaust pipe 5; the gas inlet 35 is connected with one end of the gas-water separation device 9; The other end of the separation device 9 is connected with the liquid outlet 34 ; the upper end of the gas-water separation device 9 is connected with the purified flue gas discharge port 8 .

The gas inlet 35 is communicated with the exhaust pipe 5 through the induced draft fan 10, and the remaining gas after the mixed contact between the flue gas and the multi-substance mixed liquid is introduced into the gas-water separation device 9, and the purified flue gas outlet 8 is used to separate the gas from the gas and water. discharge. The solid-liquid mixed liquid separated by the gas-water separation device 9 enters the buffer tank 13 through the liquid outlet 34 .

In the integrated equipment 25 of desulfurization, dust removal, denitration and waste heat recovery, the high-speed, high-pressure flue gas mixed with multi-substance absorbing liquid and reaction gas is atomized online by the Venturi atomization device, and then forced to spiral by the spiral channel 7 with interlayer. Under the action of cyclone homogeneous mixing, collision, contact and delay, the probability of homogeneous mixing, collision, contact, combination, absorption and heat exchange between the molecular clusters of flue gas and multi-substance absorbing liquid and gas is increased. This creates the best conditions for further recovery of waste heat and complete absorption of sulfides, sulfur oxides, nitrogen oxides and dust. The chemical reaction mechanism is as follows:

NO in flue gas is oxidized by strong oxidizing gas to generate NO2; CO2, sulfide and sulfur oxides and nitrogen oxides except nitric oxide in flue gas are all dissolved in strong alkali aqueous solution, and after strong alkali multi-substance After the mixed absorption liquid is absorbed, stable carbonates, sulfates, nitrates and complexes are generated in the strong alkaline multi-substance mixed liquid and are trapped, and the generated nitrogen gas is discharged with the remaining gas; the process is as follows:

In the integrated equipment 25 of desulfurization, dust removal, denitration, and waste heat recovery, under the premise that nitrogen monoxide is converted into nitrogen dioxide by strong oxidizing gas, CO2, sulfide, sulfur oxides and nitrogen oxides in the flue gas are combined with strong alkali. The combined absorption of multi-substance absorption liquid, strong oxidizing gas, alkaline metal oxides in dust, etc., will generate carbonate, sulfite, nitrite, sulfate, nitrate and derived complexes, etc. These substances are dissolved in the mixed liquid to form a multi-substance mixed absorption liquid, that is, a strong polar multi-substance absorption liquid, which is returned to the effusion pool 20 for recycling; the substances precipitated in the mixed liquid are solidified into ash. for secondary use.

The practical significance of the invention patent: desulfurization, dust removal, denitration, waste heat recovery integrated equipment25, abandoning the traditional equipment, the unreasonable design of the reaction tower, easy scaling and clogging, large wind resistance, high cost, large land occupation, operation The disadvantages of high cost, difficult maintenance, and low reaction processing efficiency have improved the overall operating efficiency and created reliable conditions for the online intelligent operation of power generation boilers and large, medium and small boilers and kilns used by enterprises. This innovation, It breaks through the shortcomings of traditional supporting equipment, reduces the input cost of related supporting facilities, and also reduces the related operating costs, fundamentally solves the problem of substandard flue gas emissions, and achieves the purpose of energy saving and consumption reduction.

The integrated equipment of desulfurization, dust removal, denitration, and waste heat recovery 25 realizes the fully homogeneous mixing, collision, contact, combination, absorption, and delay of flue gas molecular clusters, multi-substance mixed absorption liquid molecular clusters, and reaction gas molecular clusters. In order to ensure complete completion of the compounding reaction and absorption. The integrated equipment of desulfurization, dust removal, denitrification and waste heat recovery 25 has the purpose of completely eliminating harmful gases in flue gas, eliminating dust above PM2.5 dust, and further recovering waste heat of flue gas; Simple and reasonable, it avoids the risks of air leakage, scaling and blockage, ensures the continuous and normal operation of the integrated equipment, and provides a guarantee for the online intelligent operation of the integrated equipment and system.

To sum up, the desulfurization, dust removal, denitrification, waste heat recovery integrated equipment and its purification system application are not limited to the content of the present utility model; the core theory of the present utility model desulfurization, dust removal, denitrification, and waste heat recovery integrated equipment is: Venturi atomization mixed washing principle, spiral channel principle with interlayer, liquid sealing principle of vertebral body sewage pipe and lower return smoke exhaust pipe with interlayer combined structure; desulfurization, dust removal, denitration, waste heat recovery of the utility model The integrated equipment can be designed with an interlayer, or can be designed as an integrated equipment without an interlayer; in the application of the integrated equipment for desulfurization, dust removal, denitrification, and waste heat recovery, the integrated equipment with an interlayer can be used alone in this field. , you can also use integrated equipment without interlayer, and you can use two or more integrated equipment in series according to process requirements, which are respectively used for nitric oxide oxidation, carbon monoxide combustion, heat exchange, and dust removal. The integrated equipment without interlayer is connected in series for desulfurization, denitration, dust removal and purification; the integrated equipment of desulfurization, dust removal, denitrification and waste heat recovery can be applied in other fields, and can also be used in workshops, indoor dust removal and humidification; in the field of water treatment It can be used for the online mixing process of sewage and flocculants at the front end, etc.; it can be miniaturized for dust removal, humidification, deodorization, etc.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise form disclosed, and obviously many changes and modifications are possible in light of the above teachings. The exemplary embodiments were chosen and described for the purpose of explaining certain principles of the invention and its practical applications, to thereby enable those skilled in the art to make and utilize various exemplary embodiments of the invention and various Different choices and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims (9)

1. a desulfurization, dust removal, denitration, waste heat recovery integrated equipment, it is characterized in that: this desulfurization, dust removal, denitration, waste heat recovery integrated equipment comprises a venturi atomization device, a body, at least one gas-liquid supplementary hole, heat exchange Medium inlet pipe, heat exchange medium outlet pipe, smoke exhaust pipe, spiral plate and sewage pipe; the venturi atomization device includes a smoke inlet pipe, a multi-substance mixed absorption liquid inlet, a reaction gas inlet, a Venturi atomizer, The atomization inlet and the atomization outlet; the smoke inlet pipe, the multi-substance mixed absorption liquid inlet and the reaction gas inlet are placed at the front end of the venturi atomization device; the rear end of the smoke inlet pipe, the multi-substance mixture The rear end of the absorption liquid inlet and the rear end of the reaction gas inlet are respectively connected with the front end of the atomization inlet; the rear end of the venturi atomization inlet is connected with the venturi atomizer; the venturi The rear end of the inner atomizer is connected with the atomization outlet; the atomization outlet is communicated with the upper end of the main body; the lower end of the main body is connected with the sewage pipe; the heat exchange The medium inlet pipe is communicated with the lower end outer wall of the body; the heat exchange medium outlet pipe is communicated with the upper end outer wall of the body; the smoke exhaust pipe is placed in the middle of the body; the lower end of the smoke exhaust pipe is connected to the outer wall of the upper end of the body; the upper end of the smoke exhaust pipe protrudes from the top of the main body; the spiral plate is placed between the side wall of the main body and the outer wall of the smoke exhaust pipe; the The gas-liquid replenishing hole is opened in the spiral channel formed between the side surface of the main body and the spiral plate. 2. The integrated equipment for desulfurization, dust removal, denitration and waste heat recovery according to claim 1, characterized in that: the inlet of the multi-substance mixed absorption liquid and the inlet of the reaction gas are both nozzles; The end communicates with the upper end of the body along the tangential direction. 3. The integrated equipment for desulfurization, dust removal, denitration and waste heat recovery according to claim 1, characterized in that: the smoke exhaust pipe is a bottom-returning smoke exhaust pipe; the smoke exhaust pipe, the spiral plate and the The bodies are all provided with interlayers; the interlayers communicate with each other; the interlayers are provided with a heat exchange medium; the sewage pipes are water-sealed vertebral sewage pipes. 4. A purification system of desulfurization, dust removal, denitration, and waste heat recovery integrated equipment, characterized in that: the purification system comprises the desulfurization, dust removal, denitration, and waste heat recovery integrated equipment described in any one of claims 1-3; and It includes a heat exchange and dust removal device, a gas-water separation system, a solid-liquid separation system and a multi-substance mixed absorption liquid system; the rear end of the heat exchange and dust removal device is connected to the front end of the smoke inlet pipe; the gas-water separation system is connected to the The rear end of the exhaust pipe is connected; the solid-liquid separation system is connected with the sewage pipe; the outlet end of the multi-substance mixed absorption liquid system is connected with the multi-substance mixed absorption liquid inlet. The multi-substance mixed absorption liquid system includes a water replenishing pipe, an absorption liquid conveying pipe, a mixing tank and a liquid accumulation pool; the water replenishing pipe and the absorption liquid conveying pipe are respectively connected with the mixing tank; the The outlet of the mixing tank is connected with the liquid accumulation pool; the liquid accumulation pool is connected with the inlet of the multi-substance mixed absorption liquid. 5. The purification system of integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery according to claim 4, characterized in that: the liquid accumulation tank is connected to the inlet of the multi-substance mixed absorption liquid through the first liquid pump . 6. The purification system of integrated equipment for desulfurization, dust removal, denitration and waste heat recovery according to claim 4, characterized in that: the solid-liquid separation system comprises a solid-liquid separation device, a buffer tank, an online automatic filter device, a sludge solidification device and a waste residue recovery device; the solid-liquid separation device is installed at the lower end of the sewage pipe; the mixed liquid outlet of the solid-liquid separation device is connected to the buffer tank; The liquid outlet is connected with the online automatic filtering device; the liquid outlet of the online automatic filtering device is connected with the liquid accumulation pool; the solid-liquid separation device and the sediment in the buffer tank The outlets are respectively connected with the sludge solidification device; the liquid outlet of the sludge solidification device is connected with the liquid accumulation tank; the solidified product outlet of the sludge solidification device is connected with the waste residue recovery device . 7. The purification system of integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery according to claim 6, characterized in that: the liquid outlet of the sludge solidification device communicates with the sludge solidification device through the second liquid pump. The liquid accumulation tank is connected; the solid-liquid separation device and the sediment outlet of the buffer tank are respectively connected with the sludge solidification device through the sludge output device. 8. The purification system of integrated equipment for desulfurization, dust removal, denitration and waste heat recovery according to claim 4, characterized in that: the gas-water separation system comprises a gas inlet, a purified flue gas outlet, a gas-water separation device and a the liquid outlet; the gas inlet is communicated with the smoke exhaust pipe; the gas inlet is connected with one end of the gas-water separation device; the other end of the gas-water separation device is connected with the liquid outlet; the The upper end of the gas-water separation device is communicated with the purified flue gas discharge port. 9 . The purification system of integrated equipment for desulfurization, dust removal, denitrification and waste heat recovery according to claim 8 , wherein the gas inlet is communicated with the exhaust pipe through an induced draft fan. 10 .

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