Incineration treatment system and method for low-heating-value waste liquid

Abstract

The invention relates to a low-calorific-value waste liquid incineration treatment system and method in the technical field of low-calorific-value waste liquid treatment. The low-calorific-value waste liquid incineration treatment system comprises a waste liquid storage tank, a distillation device, a concentration device, a steam pocket, a solid material pipeline, a liquid material pipeline and a boiler incineration device. According to the low-heating-value waste liquid incineration treatment system, low-temperature steam generated by the concentration device is ingeniously used as a heat source of the distillation device to form a secondary waste liquid treatment device, fine decomposition of the low-heating-value waste liquid is achieved under the condition that energy consumption does not need to be increased, and a liquid material and a solid material which are high in heating value and high in combustibility are formed; the temperature value in the hearth can meet the standard temperature value requirement of incineration decontamination by stably combusting the solid material alone or the solid material and the liquid material simultaneously in the hearth; the technical problems of high energy consumption, high cost and increased flue gas emission caused by the fact that a large amount of natural gas needs to be supplemented during combustion treatment of the low-heating-value waste liquid are basically solved.

Description

Technical Field

[0001] The present invention relates to the field of energy-saving and environmental protection technology. Specifically, the technical field classification number relates to C02F1 / 02, and more specifically, to a low calorific value waste liquid incineration treatment system and method. Background Art

[0002] The production and manufacturing process of the chemical and pharmaceutical industries produces a large amount of waste liquid, which has the characteristics of high viscosity, complex composition, and large fluctuations in calorific value and components. The conventional method of treating waste liquid is to adopt the process technology route of "incinerator + waste heat furnace + tail gas treatment". This method has obvious advantages for high calorific value waste liquid, but some waste liquids have very high water content and low calorific value, and even have negative calorific value. When using the above-mentioned incineration method for treatment, a large amount of natural gas needs to be supplemented, which increases the operating cost of the enterprise. The large-scale burning of natural gas also increases the amount of flue gas, resulting in excessive increase in equipment selection and increased floor space. At the same time, the separation of the incinerator and the waste heat furnace also increases the initial investment cost. Therefore, it is necessary to develop new technologies suitable for the incineration treatment system of low calorific value waste liquid.

[0003] For example, the Chinese invention patent application with publication number CN111777120A discloses a method for disposing low calorific value waste liquid, which includes the following steps: using the waste heat of steam generated by the incineration system to evaporate and concentrate the low calorific value waste liquid, and the low calorific value waste liquid is evaporated and concentrated to generate concentrated liquid and gaseous steam; passing the concentrated liquid into the incineration system for incineration disposal; passing the gaseous steam into the incineration system for incineration disposal. Although this technical solution can meet the basic requirements of incineration, it still has technical problems such as the need to supplement natural gas during the combustion process, which consumes a lot of energy, and the cost is relatively high. Summary of the invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide a low calorific value waste liquid incineration treatment system and method.

[0005] A low calorific value waste liquid incineration treatment system provided by the present invention comprises a waste liquid storage tank, a distillation device, a concentration device, a steam drum, a solid material pipeline, a liquid material pipeline and a boiler incineration device;

[0006] The low calorific value waste liquid is sent from the waste liquid storage tank to the distillation device, and the primary waste liquid formed by the treatment of the distillation device is sent to the concentrating device. The high-temperature steam of the steam drum is passed into the concentrating device to exchange heat with the primary waste liquid to form solid material and low-temperature steam. The solid material is sent to the boiler incineration device for combustion through the solid material pipeline. The low-temperature steam is sent to the distillation device as a heat source to exchange heat with the low calorific value waste liquid to form primary waste liquid and gaseous material. The gaseous material is formed into liquid material through the liquid material pipeline. The liquid material pipeline is connected with the boiler incineration device. When the temperature value generated by the combustion of the solid material in the boiler incineration device is lower than the predetermined value, the liquid material in the liquid material pipeline is sent to the boiler incineration device to assist the stable combustion of the solid material.

[0007] In some embodiments, the solid material pipeline includes a solid material storage tank, which receives the solid material output by the concentration device and sends it into the boiler incineration device.

[0008] In some embodiments, the liquid pipeline includes a cooler, a liquid storage tank, a flow meter and a regulating valve that are connected in sequence. The gaseous material output from the distillation device is condensed into liquid material by the cooler and then sent into the liquid storage tank. The flow meter and the regulating valve are used to control the amount of liquid material entering the boiler incineration device.

[0009] In some embodiments, the boiler combustion device includes a boiler body, a first burner, a superheater, a primary air preheater, a secondary air preheater, and an economizer;

[0010] The boiler body includes a wind chamber, a furnace, a flue and a chimney which are connected in sequence. The first burner is installed on the wind chamber. The superheater, the primary air preheater, the secondary air preheater and the economizer are arranged in the flue in sequence from top to bottom. The primary air preheater is ventilated to the wind chamber through the air duct, and the secondary air preheater is ventilated to the furnace through the air duct.

[0011] In some embodiments, a first nozzle is formed in the furnace, and a plurality of the first nozzles are vertically arranged side by side in front of an inlet for solid materials.

[0012] In some embodiments, a control system is further included, which includes a PLC controller and a temperature detector. The temperature detector is arranged in the furnace, and the regulating valve and the temperature detector are electrically connected to the PLC controller respectively. The PLC controller controls the opening of the regulating valve according to the temperature parameters transmitted by the temperature detector.

[0013] In some embodiments, the boiler incineration device further includes a second burner, a second nozzle is provided in the furnace, an electric damper is provided on the wind path branch pipe connected to the second nozzle, the second burner is installed on the top of the furnace, the second nozzle is located below the second burner, and the electric damper and the second burner are electrically connected to the PLC controller respectively;

[0014] When the temperature parameter transmitted by the temperature detector is lower than a preset value, the PLC controller controls the electric damper and the second burner to open to supplement the external gas heat.

[0015] In some embodiments, the boiler incineration device further includes a flue gas treatment device, which includes a bag dust removal device and a flue gas denitrification device. The flue gas discharged from the flue passes through the bag dust removal device and the flue gas denitrification device in sequence and is then discharged into the chimney.

[0016] The present invention also provides a method for incinerating low calorific value waste liquid, which uses the low calorific value waste liquid incineration treatment system, comprising:

[0017] Waste liquid pretreatment: low calorific value waste liquid is sent from the waste liquid storage tank into the distillation device, and at the same time, the high-temperature steam of the drum is sent into the concentrating device. In the initial state, the untreated low calorific value waste liquid is sent into the concentrating device to exchange heat with the high-temperature steam to form solid materials and low-temperature steam. The solid materials are sent to the boiler incineration device through the solid material pipeline for combustion, and the low-temperature steam is refluxed to the distillation device through the pipeline as a heat source. The low calorific value waste liquid is heat-exchanged with the low-temperature steam to form primary waste liquid and gaseous materials. The primary waste liquid is continuously sent to the concentrating device for heat exchange treatment with the high-temperature steam, and the gaseous materials are sent to the liquid material pipeline to form liquid materials;

[0018] Material incineration treatment: The PLC controller controls the first burner to start the ignition program, and the solid material entering the furnace is burned with the preheated air sprayed from the first nozzle. According to the temperature value in the furnace detected by the temperature detector, the PLC controller controls the opening of the regulating valve and the switch of the second burner and the electric damper:

[0019] When the temperature detector detects that the temperature in the furnace is lower than 850°C, the PLC controller first sends an opening signal to the regulating valve, and liquid fuel is introduced into the furnace and burned simultaneously with the solid fuel; when the regulating valve is opened to the maximum, and the temperature detector detects that the temperature in the furnace still cannot be stabilized above 850°C, the PLC controller sends an adjustment signal to the electric damper and the second burner, and external combustible materials are added to the furnace through the second burner to mix with air and burn, thereby meeting the temperature value requirement in the furnace 712.

[0020] In some embodiments, in the material incineration treatment step, the PLC controller sends a control command according to the calorific value of the solid fuel and the temperature value detected by the temperature detector, wherein the solid material is classified according to the calorific value Q, namely Q1 ≥ 1000 kcal / kg, 850 kcal / kg ≤ Q2 < 1000 kcal / kg, Q3 < 850 kcal / kg, a total of 3 categories:

[0021] When it is Q1 working condition, when the solid material is burned alone as the main fuel in the furnace to ensure that the temperature is not lower than 850°C, the temperature detector assists in monitoring the temperature signal;

[0022] When it is Q2 working condition, when solid material is burned in the furnace as the main fuel, when the temperature detector detects that the temperature is lower than 850°C, the PLC controller sends a regulating signal to the regulating valve, and the liquid material is supplied into the furnace to be burned together with the solid material;

[0023] When it is Q3 working condition, when solid material is burned in the furnace as the main fuel, when the temperature detector detects that the temperature is lower than 850℃, the PLC controller first sends an adjustment signal to the regulating valve. When the regulating valve opening reaches the maximum and the temperature in the furnace is still lower than 850℃, the PLC controller sends an adjustment signal to the electric damper and the second burner, and external combustible material is supplemented into the furnace through the second burner for combustion.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The low calorific value waste liquid incineration treatment system of the present invention forms a secondary waste liquid treatment device by cleverly using the low-temperature steam generated by the concentration device as the heat source of the distillation device, thereby realizing the fine decomposition of the low calorific value waste liquid without increasing energy consumption, forming liquid materials and solid materials with high calorific value and strong flammability. The solid material alone or the solid material and the liquid material are stably burned in the furnace to ensure that the temperature value in the furnace meets the standard temperature value requirement for incineration and decontamination, which basically solves the technical problems of high energy consumption, high cost and increased flue gas emissions caused by the need to supplement a large amount of natural gas during the combustion treatment of low calorific value waste liquid.

[0026] 2. The low calorific value waste liquid incineration treatment system of the present invention can adjust the feed rate of liquid material in real time according to the calorific value of solid material by adding a control device, so as to achieve the purpose of stable and sufficient combustion. In addition, by setting a second burner and related nozzle structure, the temperature value requirement in the furnace can be met when the combustible material in the low calorific value waste liquid is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 This is a working principle diagram of the low calorific value waste liquid incineration treatment system of the present invention;

[0029] Figure 2 This is a schematic diagram of the electrical connection relationship between the control system of the present invention and other components. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0031] Example 1

[0032] This embodiment provides a low calorific value waste liquid incineration treatment system, such as Figure 1-2 As shown, it includes a waste liquid storage tank 100, a distillation device 200, a concentration device 300, a steam drum 400, a solid material pipeline 500, a liquid material pipeline 600 and a boiler incineration device 700.

[0033] The waste liquid storage tank 100 is used as a container for storing low calorific value waste liquid. The waste liquid storage tank 100, the distillation device 200, and the concentration device 300 are connected in sequence. The distillation device 200 is an internal coil structure, and the outside of the coil is the low calorific value waste liquid input from the waste liquid storage tank 100. The coil inlet of the distillation device 200 is connected to the steam outlet of the concentration device 300, and its coil outlet is connected to the external wastewater storage tank 900. The steam outlet located at the top of the distillation device 200 is connected to the inlet of the liquid pipeline 600 through a pipeline, and the outlet of the liquid pipeline 600 is connected to the boiler incineration device 700 through a pipeline. In this embodiment, the liquid pipeline 600 is mainly composed of a cooler 610, a liquid storage tank 620, a flow meter 630 and a regulating valve 640 that are connected in sequence. The high calorific value material vapor formed by evaporation from the distillation device 200 is condensed into liquid material through the cooler 610 and then enters the liquid material storage tank 620. The liquid material in the liquid material storage tank 620 is supplied to the boiler incineration device 700 through the cooperation of the flow meter 630 and the regulating valve 640. Whether to supply the material and the amount of supply are determined according to preset instructions and controlled by the opening of the regulating valve 640.

[0034] The concentrator 300 is an internal coil structure, and the outside of the coil is the primary waste liquid input from the distillation device 200. The coil inlet of the concentrator 300 is connected to the high-temperature steam output port of the drum 400, and the coil outlet is connected to the water inlet of the high-temperature drum 400. The primary waste liquid that enters the concentrator 300 and is located outside the coil exchanges heat with the high-temperature steam to form solid materials and steam with high calorific value. The solid material is sent to the solid material pipeline 500, and the steam enters the coil of the distillation device 200 through the pipeline as the evaporation heat source of the distillation device 200. In this embodiment, the solid material pipeline 500 mainly includes a solid material storage tank 510. After the solid material output from the concentrator 300 enters the solid material storage tank 510 through the pipeline, the solid material storage tank 510 then sends the solid material to the boiler incineration device 700 through the pipeline, and the solid material is burned in the boiler incineration device 700.

[0035] The boiler combustion device 700 mainly includes a boiler body 710, a first burner 720, a superheater 730, a primary air preheater 740, a secondary air preheater 750 and an economizer 760. The boiler body 710 includes a wind chamber 711 located at the bottom, a furnace 712 located at the upper part of the wind chamber 711 and connected, a flue 713 connected to the furnace 712, and a chimney 714 connected to the flue 713. The first burner 720 is installed on the wind chamber 711 for starting ignition. The superheater 730, the primary air preheater 740, the secondary air preheater 750 and the economizer 760 are stacked and arranged in the flue 713 from top to bottom. The primary air preheater 740 is connected to the wind chamber 711 through the air duct, and preheated air is introduced into the wind chamber 711. The secondary air preheater 750 is connected to the furnace 712 through an air duct, and preheated air is introduced into the furnace 712. In this embodiment, the first air duct branch entering the furnace 712 is provided with a plurality of first nozzles 7121 spaced apart from each other, and the first nozzles 7121 are located at the solid material feed port. In this embodiment, the boiler incineration device 700 also includes a flue gas treatment device 780, and the flue gas treatment device 780 includes a bag dust removal device 781 and a flue gas denitrification device 782. The flue gas discharged from the flue 713 passes through the bag dust removal device 781 and the flue gas denitrification device 782 in turn, and then is discharged into the chimney 714 through the induced draft fan, and finally the flue gas is discharged through the chimney 714.

[0036] The working principle of the low calorific value waste liquid incineration treatment system provided by the present application is as follows: the low calorific value waste liquid is transported to the distillation device 200 through the waste liquid storage tank 100. Initially, the low calorific value waste liquid in the distillation device 200 that has not been heat-treated enters the concentration device 300, and forms solid materials and low-temperature steam after heat exchange with the high-temperature steam from the drum 400 that passes into the coil of the concentration device 300. The low-temperature steam enters the coil of the distillation device 200 through the pipeline and performs heat exchange with the low calorific value waste liquid outside the coil, so that the low calorific value waste liquid forms primary waste liquid and gaseous materials. Here, the gaseous materials mainly refer to organic combustible materials in the low calorific value waste liquid whose boiling point is lower than the boiling point of water, such as hydrocarbon organic matter, and because it is difficult for the low-temperature steam to make the water in the low calorific value waste liquid form steam, there is less water vapor in the gaseous material, which effectively ensures the purity of the gaseous material and improves the combustibility and calorific value of the condensed liquid material. The primary waste liquid is continuously fed into the concentration device 300 to exchange heat with the high-temperature steam, and the gaseous material enters the cooler 610 through the pipeline, and the liquid material formed in the cooler 610 is fed into the liquid material storage tank 620 for storage. When the solid material entering the furnace 712 can be stably burned and meets the temperature requirements in the furnace 712, the liquid material is not fed into the furnace 712. When the temperature value generated by the combustion of the solid material in the furnace 712 is lower than the predetermined value, the liquid material in the liquid material storage tank 620 is fed into the furnace 712 to assist the solid material in stable combustion.

[0037] This embodiment cleverly uses the low-temperature steam generated by the concentration device as the heat source of the distillation device to form a secondary waste liquid treatment device, thereby achieving fine decomposition of low calorific value waste liquid without increasing energy consumption, forming liquid materials and solid materials with high calorific value and strong flammability. The solid material alone or the solid material and the liquid material are stably burned in the furnace to ensure that the temperature value in the furnace meets the standard temperature value requirement for incineration and pollution removal, which basically solves the technical problems of high energy consumption, high cost and increased flue gas emissions caused by the need to supplement a large amount of natural gas during the combustion treatment of low calorific value waste liquid.

[0038] Example 2

[0039] This embodiment 2 is formed on the basis of embodiment 1. By adding a control device, the feed amount of the liquid material can be adjusted in real time according to the calorific value of the solid material to achieve the purpose of stable and sufficient combustion. In addition, by setting a second burner and related nozzle structures, the calorific value requirements in the furnace can be met when the combustibles in the low calorific value waste liquid are low. Specifically:

[0040] The control device 800 is also included, and the control device 800 includes a PLC controller 810 and a temperature detector 820. In this embodiment, the temperature detector 820 is a thermocouple. A plurality of temperature detectors 820 are arranged in the furnace 712 according to the upper, middle and lower directions to collect the temperature value of the furnace 712. The temperature detector 820 and the regulating valve 640 are electrically connected to the PLC controller 810 respectively. The PLC controller 810 determines the opening of the regulating valve 640 according to the temperature value in the furnace 712 transmitted by the temperature detector 820, that is, according to whether the combustion temperature value of the solid material in the furnace 712 meets the requirements, it determines whether to add liquid material to the furnace 712 and the amount of liquid material to be added, so as to achieve stable and sufficient combustion and meet the requirements of the temperature value in the furnace.

[0041] Furthermore, the boiler incineration device 700 is also provided with a second burner 770, which is installed on the top of the furnace 712, and the air duct entering the furnace 712 forms a second air duct branch, and a second nozzle 7122 is formed at the end of the second air duct branch, and the second nozzle 7122 is located below the second burner 770. In addition, an electric damper 7123 is provided on the second air duct branch upstream of the second nozzle 7122, which is used to control whether the second nozzle 7122 supplies air into the furnace 712. The external combustible gas is mixed with the preheated air sprayed from the second nozzle 7122 through the second burner 770 and fully burned as supplementary heat to solve the problem that the minimum standard requirement of the temperature value in the furnace 712 cannot be reached when both solid materials and liquid materials are burned at the same time.

[0042] Example 3

[0043] This embodiment 3 is a method for treating low calorific value waste liquid formed on the basis of embodiment 2, using the low calorific value waste liquid treatment system described in embodiment 2, and includes the following steps:

[0044] Waste liquid pretreatment step: low calorific value waste liquid is sent from the waste liquid storage tank 100 into the distillation device 200, and at the same time, the high-temperature steam of the steam drum 400 is sent into the concentration device 300. In the initial state, the untreated low calorific value waste liquid is sent to the concentration device 300 for heat exchange with the high-temperature steam to form solid material and low-temperature steam. The solid material is sent to the boiler incineration device 700 through the solid material pipeline 500 for combustion, and the low-temperature steam flows back to the distillation device 200 through the pipeline as a heat source. The low calorific value waste liquid is heat exchanged with the low-temperature steam to form primary waste liquid and gaseous material. The primary waste liquid is continuously sent to the concentration device 300 for heat exchange treatment with the high-temperature steam, and the gaseous material is sent to the liquid material pipeline 600 to form liquid material.

[0045] Material incineration treatment steps: PLC controller 810 controls the first burner 720 to start the ignition program, and the solid material entering the furnace 712 is burned with the cooperation of the preheated air sprayed by the first nozzle 7121. According to the temperature value in the furnace 712 detected by the temperature detector 820, the PLC controller 810 controls the opening of the regulating valve 640 and the switch of the second burner 770 and the electric damper 7123. When the temperature detector 820 detects that the temperature in the furnace 712 is lower than 850°C, the regulating valve 640 is controlled to open through the PLC controller 810, and the liquid fuel is introduced into the furnace 712 and burned simultaneously with the solid fuel, ensuring that the temperature in the furnace 712 is stable above 850°C. When the valve of the regulating valve 640 is opened to the maximum, and the temperature detector 820 detects that the temperature in the furnace 712 still cannot be stabilized above 850°C, a regulating signal is sent to the electric damper 7123 and the second burner 770 through the PLC controller 810. The second burner 770 is turned on as an auxiliary burner to provide heat to the furnace 712 by adding a small amount of natural gas to meet the temperature value requirement in the furnace 712.

[0046] This embodiment also provides a method for implementing operations such as introducing liquid materials and external natural gas into the furnace 712 by combining the solid fuel calorific value with the temperature value in the furnace 712 detected by the temperature detector 820. Specifically:

[0047] According to the calorific value Q of the main fuel solid material, there are three categories: Q1 ≥ 1000kcal / kg, 850kcal / kg ≤ Q2 < 1000kcal / kg, Q3 < 850kcal / kg:

[0048] For Q1 working condition, when solid material is burned as the main fuel in the furnace 712, by monitoring the temperature signals of the three temperature detectors 820 in the furnace 712, it can ensure that the temperature in the furnace 712 is not lower than 850°C. The PLC controller 810 does not need to send a regulating signal to the regulating valve 640, and there is no need to supply liquid material.

[0049] For the Q2 working condition, when solid materials are burned as the main fuel in the furnace 712, the temperature signals of the three temperature detectors 820 in the furnace 712 are monitored. When it is found that the temperature in the furnace 712 is slightly lower than 850°C, the PLC controller 810 sends a regulating signal to the regulating valve 640 to supply liquid materials into the furnace 712 to keep the temperature in the furnace 712 not lower than 850°C, thereby achieving stable combustion and achieving energy conservation and emission reduction effects.

[0050] For the Q3 working condition, when solid materials are burned in the furnace 712 as the main fuel, the temperature signals of the three temperature detectors in the furnace 712 are monitored, and it is found that the temperature in the furnace 712 is significantly lower than 850°C. The PLC controller 810 sends an adjustment signal to the regulating valve 640 to supply liquid materials into the furnace 712. When the opening of the regulating valve 640 reaches the maximum and the temperature in the furnace 712 is still lower than 850°C, the PLC controller 810 sends an adjustment signal to the electric damper 7123 and the second burner 770. The second burner 770 is turned on as an auxiliary burner, and a small amount of natural gas is added to provide heat to the furnace 712, thereby achieving stable combustion and achieving energy conservation and emission reduction effects.

[0051] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A low calorific value waste liquid incineration treatment system, characterized in that: It comprises a waste liquid storage tank (100), a distillation device (200), a concentration device (300), a steam drum (400), a solid material pipeline (500), a liquid material pipeline (600) and a boiler incineration device (700); The low calorific value waste liquid is sent from the waste liquid storage tank (100) to the distillation device (200), and the primary waste liquid formed by the treatment of the distillation device (200) is sent to the concentration device (300). The high temperature steam of the steam drum (400) is passed into the concentration device (300) to exchange heat with the primary waste liquid so that the primary waste liquid forms solid material and low temperature steam. The solid material is sent to the boiler incineration device (700) through the solid material pipeline (500) for combustion, and the low temperature steam is sent to the distillation device (200) is used as a heat source to exchange heat with low calorific value waste liquid, so that the low calorific value waste liquid forms primary waste liquid and gaseous material, and the gaseous material forms liquid material through the liquid material pipeline (600). The liquid material pipeline (600) is connected to the boiler incineration device (700). When the temperature value generated by the combustion of solid material in the boiler incineration device (700) is lower than a predetermined value, the liquid material in the liquid material pipeline (600) is sent into the boiler incineration device (700) to assist the stable combustion of the solid material.

2. The low calorific value waste liquid incineration treatment system according to claim 1 is characterized in that: The solid material pipeline (500) includes a solid material storage tank (510), and the solid material storage tank (510) receives the solid material output by the concentration device (300) and sends it into the boiler incineration device (700).

3. The low calorific value waste liquid incineration treatment system according to claim 1 is characterized in that: The liquid material pipeline (600) includes a cooler (610), a liquid material storage tank (620), a flow meter (630) and a regulating valve (640) which are connected in sequence. The gaseous material output from the distillation device (200) is condensed into liquid material by the cooler (610) and then sent to the liquid material storage tank (620). The flow meter (630) and the regulating valve (640) are used to control the amount of liquid material entering the boiler incineration device (700).

4. The low calorific value waste liquid incineration treatment system according to claim 3 is characterized in that: The boiler combustion device (700) comprises a boiler body (710), a first burner (720), a superheater (730), a primary air preheater (740), a secondary air preheater (750) and an economizer (760); The boiler body (710) comprises a wind chamber (711), a furnace (712), a flue (713) and a chimney (714) which are connected in sequence; the first burner (720) is installed on the wind chamber (711); the superheater (730), the primary air preheater (740), the secondary air preheater (750) and the economizer (760) are arranged in the flue (713) in sequence from top to bottom; the primary air preheater (740) is ventilated to the wind chamber (711) through the wind duct, and the secondary air preheater (750) is ventilated to the furnace (712) through the wind duct.

5. The low calorific value waste liquid incineration treatment system according to claim 4 is characterized in that: A first nozzle (7121) is formed in the furnace (712), and a plurality of the first nozzles (7121) are vertically arranged side by side in front of an inlet for solid materials.

6. The low calorific value waste liquid incineration treatment system according to claim 4 is characterized in that: The invention also includes a control system (800), wherein the control system (800) includes a PLC controller (810) and a temperature detector (820), wherein the temperature detector (820) is arranged in the furnace (712), and the regulating valve (640) and the temperature detector (820) are electrically connected to the PLC controller (810) respectively, and the PLC controller (810) controls the opening of the regulating valve (640) according to the temperature parameter transmitted by the temperature detector (820).

7. The low calorific value waste liquid incineration treatment system according to claim 6 is characterized in that: The boiler incineration device (700) further comprises a second burner (770), which is provided with a second nozzle (7122) in the furnace (712); an electric damper (7123) is provided on an air path branch pipe connected to the second nozzle (7122); the second burner (770) is installed on the top of the furnace (712); the second nozzle (7122) is located below the second burner (770); and the electric damper (7123) and the second burner (770) are electrically connected to the PLC controller (810) respectively; When the temperature parameter transmitted by the temperature detector (820) is lower than a preset value, the PLC controller (810) controls the electric damper (7123) and the second burner (770) to open to supplement the external gas heat.

8. The low calorific value waste liquid incineration treatment system according to any one of claims 1 to 7, characterized in that: The boiler incineration device (700) also includes a flue gas treatment device (780), and the flue gas treatment device (780) includes a bag dust removal device (781) and a flue gas denitrification device (782). The flue gas discharged from the flue (713) passes through the bag dust removal device (781) and the flue gas denitrification device (782) in sequence and is then discharged into the chimney (714).

9. A method for incinerating low calorific value waste liquid, characterized in that: The low calorific value waste liquid incineration treatment system as claimed in claim 7 comprises: Waste liquid pretreatment: low calorific value waste liquid is sent from the waste liquid storage tank (100) into the distillation device (200), and at the same time, the high temperature steam of the steam drum (400) is sent into the concentration device (300). In the initial state, the untreated low calorific value waste liquid is sent into the concentration device (300) to exchange heat with the high temperature steam to form solid material and low temperature steam. The solid material is sent into the boiler incineration device (700) through the solid material pipeline (500) for combustion. The low temperature steam flows back to the distillation device (200) through the pipeline as a heat source. The low calorific value waste liquid exchanges heat with the low temperature steam to form primary waste liquid and gaseous material. The primary waste liquid is continuously sent into the concentration device (300) to exchange heat with the high temperature steam, and the gaseous material is sent into the liquid material pipeline (600) to form liquid material. Material incineration treatment: the PLC controller (810) controls the first burner (720) to start the ignition program, and the solid material entering the furnace (712) is burned in cooperation with the preheated air sprayed by the first nozzle (7121). According to the temperature value in the furnace (712) detected by the temperature detector (820), the PLC controller (810) controls the opening of the regulating valve (640) and the switching of the second burner (770) and the electric damper (7123): When the temperature detector (820) detects that the temperature in the furnace (712) is lower than 850° C., an opening signal is first sent to the regulating valve (640) through the PLC controller (810), and liquid fuel is introduced into the furnace (712) to be burned simultaneously with the solid fuel; when the regulating valve (640) is opened to the maximum, and the temperature detector (820) detects that the temperature in the furnace (712) is still not stable above 850° C., an adjustment signal is sent to the electric damper (7123) and the second burner (770) through the PLC controller (810), and external combustible materials are added to the furnace (712) through the second burner (770) to be mixed with air and burned, thereby meeting the temperature value requirement in the furnace 712.

10. The method for incinerating low calorific value waste liquid according to claim 9, characterized in that: In the material incineration treatment step, the PLC controller (810) sends a control command according to the calorific value of the solid fuel and the temperature value detected by the temperature detector (820), wherein the solid material is classified according to the calorific value Q, namely Q1≥1000kcal / kg, 850kcal / kg≤Q2<1000kcal / kg, Q3<850kcal / kg, a total of 3 categories: When the solid material is burned alone as the main fuel in the furnace (712) in the Q1 working condition, the temperature can be guaranteed to be not less than 850° C., and the temperature detector (820) assists in monitoring the temperature signal; When the solid material is burned as the main fuel in the furnace (712) in the Q2 working condition, and the temperature detector (820) detects that the temperature is lower than 850° C., the PLC controller (810) sends a regulating signal to the regulating valve (640), and the liquid material is supplied into the furnace (712) to be burned together with the solid material; When the operating condition is Q3, when solid materials are used as the main fuel to burn in the furnace (712), when the temperature detector (820) detects that the temperature is lower than 850°C, the PLC controller (810) first sends a regulating signal to the regulating valve (640). When the opening of the regulating valve (640) reaches the maximum and the temperature in the furnace (712) is still lower than 850°C, the PLC controller (810) sends a regulating signal to the electric damper (7123) and the second burner (770), and external combustible materials are supplemented into the furnace (712) through the second burner (770) for combustion.

Images