CN114321945A - Incineration method and system for high-water-content organic waste liquid - Google Patents

Abstract

The application relates to the field of environmental protection recycling, and in particular to a method and system for incinerating organic waste liquid with high water content; the method includes: obtaining organic waste liquid with high water content; concentrating the organic waste liquid with high water content to obtain organic waste liquid The concentrated liquid of the liquid; the pulverized coal is added to the concentrated liquid of the organic waste liquid for stirring and mixing to obtain a mixed slurry of "water-coal-organic waste liquid concentrated liquid"; the mixed slurry is atomized and then burned to obtain the waste heat of the flue gas N-level air is introduced into the combustion stage; the system includes: a waste liquid storage unit; a waste liquid concentration unit, the waste liquid storage unit is connected to the waste liquid concentration unit; a stirring and mixing unit, the stirring and mixing unit includes a pulverized coal feeding part and a pulping part , the waste liquid concentration unit is connected to the pulping part, and the pulverized coal feeding part is connected to the pulping part; the combustion unit, the combustion unit includes a combustion furnace and an atomizer, and the atomizer is arranged in the combustion furnace; the air inlet unit, the air inlet unit is connected to the combustion unit; realize organic waste liquid combustion and heat recovery.

Description

A kind of incineration method and system of high water content organic waste liquid

technical field

The present application relates to the field of environmental protection recycling, and in particular, to a method and system for incinerating organic waste liquid with high water content.

Background technique

With the development of the national economy and the improvement of people's living standards, various industries in China have developed rapidly, and the subsequent problem of wastewater discharge has become increasingly prominent. Among them, the discharge of tens of thousands of tons in pharmaceutical, textile, petroleum, paper and other industries Concentration, refractory industrial waste liquid; generally, wastewater contains BOD (Biochemical Oxygen Demand, BOD for short) and COD (Chemical Oxygen Demand, chemical oxygen demand), usually BOD ₅ > 1000mg·L ^{- 1} and COD>2000mg·L ^-1 wastewater is called organic waste liquid. At present, the treatment methods for organic waste liquid include physical treatment, chemical treatment and biological treatment. However, the disadvantages of the above methods are that they may be affected by Due to the limitation of equipment, materials, economy or high concentration of organic matter and salt in organic waste liquid, it is impossible to achieve large-scale and economical and reasonable effective treatment of organic waste liquid. In contrast, incineration method can achieve large-scale treatment of waste. In the case of economical feasibility, waste heat recovery can be carried out to reduce treatment costs.

However, the current difficulties in the large-scale treatment of organic waste liquid by incineration are:

(1) High moisture content, because the moisture content in the waste liquid is as high as 70% or more, the untreated organic waste liquid cannot be ignited at all;

(2) Low calorific value. Due to the low content of combustibles in the waste liquid, even if the concentrated liquid containing concentrated organic waste liquid can be burned, the combustion temperature is low, and dioxins and other harmful substances are easily generated during the combustion process.

In order to overcome the above difficulties, when the organic waste liquid is incinerated, it is often necessary to add auxiliary fuel to ensure the full combustion of the organic waste liquid. Because natural gas has the advantages of high calorific value and low pollutant emission, it is usually regarded as an ideal auxiliary fuel. . However, due to the lack of natural gas resources in my country and its high price, using it as an auxiliary fuel will inevitably increase the treatment cost due to combustion, and limit the large-scale treatment of organic waste liquids.

Therefore, how to make the large-scale treatment of organic waste liquid at low cost is a technical problem that needs to be solved urgently at present.

SUMMARY OF THE INVENTION

The present application provides an incineration method and system for organic waste liquid with high water content, so as to solve the technical problem that organic waste liquid in the prior art is difficult to be treated on a large scale at low cost.

In a first aspect, the application provides a method for incinerating organic waste liquid with high water content, the method comprising:

Obtain high water content organic waste liquid;

Concentrating the high-water content organic waste liquid to obtain a concentrated solution of the organic waste liquid;

The pulverized coal is added to the concentrated solution for stirring and mixing to obtain a mixed slurry of "water-coal-organic waste liquid concentrated solution";

Atomizing the mixed slurry and post-combustion to obtain the residual heat of the flue gas after combustion;

Among them, N grade air is introduced into the combustion stage, N≥3 and N is an integer.

Optionally, the number of air stages introduced in the combustion stage is three, and the total amount of air introduced in the combustion stage includes the air volume of the primary air, the air volume of the secondary air and the air volume of the tertiary air; in mass fraction , the air volume of the primary air accounts for 45% to 55% of the total air volume, the air volume of the secondary air accounts for 35% to 45% of the total air volume, and the air volume of the tertiary air accounts for 35% to 45% of the total air volume. 5% to 15% of the total.

Optionally, the excess air coefficient of the air introduced in the combustion stage is 1.1-1.3.

Optionally, the mass ratio of water and the coal powder in the mixed slurry is 30%-40%: 60%-70%;

The mass ratio of water in the mixed slurry to the organic waste liquid is 10%-20%: 80%-90%.

Optionally, the moisture content of the high-water content organic waste liquid is greater than 70%, and the moisture content of the concentrated liquid is 10% to 20%.

Optionally, the ratio of the heat input power of the concentrate to the heat input power of the pulverized coal is 1:2 to 5;

And/or, the ratio of the flow rate of the concentrate to the flow rate of the pulverized coal is 2-10:1.

Optionally, atomizing the mixed slurry and post-combustion to obtain the residual heat of the flue gas after combustion, and then including exchanging the residual heat of the flue gas after the combustion with the combustion air to obtain the residual heat of the flue gas after the combustion. hot air.

The temperature of the air after the heat exchange is 373K-473K.

In a second aspect, the application provides an incineration system for organic waste liquid with high water content, the system is adapted to the method described in the first aspect, and the system includes:

Waste liquid storage unit, used to store organic waste liquid with high water content;

a waste liquid concentration unit, the liquid outlet of the waste liquid storage unit is connected to the liquid inlet of the waste liquid concentration unit, and is used for converting the high-water content organic waste liquid into a concentrated liquid containing concentrated organic waste liquid;

a stirring and mixing unit, the liquid outlet of the waste liquid concentration unit is connected to the liquid inlet of the stirring and mixing unit, and is used for fully mixing the pulverized coal and the concentrated liquid; the stirring and mixing unit includes a pulverized coal feeding part and a preparation part. Slurry part, the pulping part includes a first feeding port and a second feeding port, the discharge port of the waste liquid concentration unit is connected to the first feeding port of the pulping part, and the pulverized coal feeding part The discharge port is connected to the second feed port of the pulping section;

A combustion unit, the feed port of the combustion unit is connected to the discharge port of the pulping part, the combustion unit includes a combustion furnace and an atomizer, and the feed port of the atomizer is connected to the pulping part A discharge port, the atomizer is arranged in the combustion furnace, and is used for atomizing and burning the mixed slurry;

an air inlet unit, the air outlet of the air inlet unit is connected to the air inlet of the combustion unit, and is used to provide the air required for the combustion unit to perform combustion; the air inlet unit includes a blower, a heat exchanger and an N-stage ventilation The heat exchanger includes a first air inlet and a second air inlet, the air outlet of the blower is connected to the first air inlet of the heat exchanger, and the air outlet of the combustion furnace is connected to the heat exchange The second air inlet of the heat exchanger, and the air outlet of the heat exchanger is connected to the air inlet of the N-stage ventilation duct, where N≥3 and N is an integer.

Optionally, the N-stage ventilation duct includes a first ventilation duct, a second ventilation duct and a third ventilation duct, and the air inlets of the first ventilation duct, the second ventilation duct and the third ventilation duct are all. The air outlet of the heat exchanger is communicated, and the air outlets of the first ventilation duct, the second ventilation duct and the third ventilation duct are all communicated with the air inlet of the combustion furnace.

Optionally, the heat exchanger includes a first air outlet and a second air outlet, the system further includes an exhaust gas treatment unit, and the air inlet of the exhaust gas treatment unit is connected to the second air outlet of the heat exchanger, The first air outlet of the heat exchanger communicates with the air inlets of the first ventilation duct, the second ventilation duct and the third ventilation duct.

Compared with the prior art, the above-mentioned technical solutions provided in the embodiments of the present application have the following advantages:

A method for incinerating organic waste liquid with high water content provided by the embodiments of the present application, by first concentrating the organic waste liquid with high water content into organic waste liquid with low water content, and then adding pulverized coal to the concentrated organic waste liquid containing concentrated organic waste liquid The water-coal-waste liquid complex is formed in the liquid, and then the water-coal-waste liquid complex is atomized, so as to facilitate the combustion of organic waste liquid and make it fully burned, and use pulverized coal to replace natural gas, so as to realize the low cost of organic waste liquid scale processing.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

1 is a schematic flowchart of a method provided by an embodiment of the present application;

2 is a schematic diagram of a logical structure of a system provided by an embodiment of the present application;

3 is a schematic diagram of an entity structure of a system provided by an embodiment of the present application;

Among them, 1-waste liquid storage unit, 2-waste liquid concentration unit, 3-stirring and mixing unit, 31-pulverized coal feeding part, 32-pulping part, 4-combustion unit, 41-burner, 42-atomizer , 5- air inlet unit, 51- blower, 52- heat exchanger, 53-N section ventilation duct, 531-first ventilation duct, 532-second ventilation duct, 533-third ventilation duct, 6-exhaust gas processing unit.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

In one embodiment of the present application, as shown in FIG. 1 , in one embodiment of the present application, as shown in FIG. 1 , a method for incinerating organic waste liquid with high water content, the method includes:

S1. Obtaining organic waste liquid with high water content;

S2. described high water content organic waste liquid is concentrated, obtains the concentrated solution of organic waste liquid;

S3. adding pulverized coal into the concentrated solution and stirring and mixing to obtain the mixed slurry of "water-coal-organic waste liquid concentrated solution";

S4. Atomizing the mixed slurry and post-combustion to obtain the residual heat of the flue gas after combustion;

Among them, N grade air is introduced into the combustion stage, N≥3 and N is an integer.

In some optional embodiments, the number of air stages introduced into the combustion stage is three, and the total amount of air introduced into the combustion stage includes the air volume of the primary air, the air volume of the secondary air, and the air volume of the tertiary air; In terms of mass fraction, the air volume of the primary air accounts for 45% to 55% of the total air volume, the air volume of the secondary air accounts for 35% to 45% of the total air volume, and the air volume of the tertiary air accounts for 35% to 45% of the total air volume. Account for 5% to 15% of the total amount of air.

In the present application, the positive effect that the air volume of the primary air accounts for 45% to 55% of the total air volume is that within the range of this proportion, it can ensure that the mixed slurry including the water-coal-waste liquid composite can be preliminarily burned, and It is convenient for the heat after the initial combustion to be quickly transferred, thereby initially realizing the combustion of the organic waste liquid and the initial recovery of energy; when the value of the proportion is greater than the maximum value of the end point of the range, the adverse effect will be excessive primary air The air volume of the mixed slurry will cause the mixed slurry to burn too fully, and the heat release will be too fast, which is not conducive to the recovery of heat. Promote the initial combustion of the mixed slurry.

The positive effect of the secondary air volume accounting for 35% to 45% of the total air volume is that within the range of this proportion, it can ensure that the mixed slurry including the water-coal-waste liquid composite is further burned on the basis of the initial combustion , and it is convenient for the heat after further combustion to be transferred quickly, thereby further realizing the combustion of organic waste liquid and further recovery of energy; when the value of the proportion is greater than the maximum value of the end point of the range, the adverse effects will be excessive. The air volume of the secondary air will cause the mixed slurry to burn too fully, and the heat release is too fast, which is not conducive to the recovery of heat. The air volume will not be able to promote further combustion of the mixed slurry.

The positive effect of the air volume of the tertiary air accounting for 5% to 15% of the total air is that within the range of this proportion, it can ensure that the mixed slurry including the water-coal-waste liquid composite is fully burned, and it is convenient to fully burn the mixed slurry. Heat can be transferred quickly, so as to achieve complete combustion of organic waste liquid and full recovery of energy; when the value of the ratio is greater than the maximum value at the end of the range, the adverse effect will be that excessive tertiary air volume will lead to mixing The temperature of the slurry is too low, and at the same time, too much air volume of the tertiary air will take away part of the heat and affect the recovery of heat. When the value of the proportion is less than the minimum value of the endpoint of the range, the adverse effect will be too low tertiary air. The air volume will not be able to promote full combustion of the mixed slurry.

In some optional embodiments, the excess air coefficient of the air introduced in the combustion stage is 1.1-1.3.

In the present application, the positive effect of the excess air coefficient of the air introduced in the combustion stage being 1.1 to 1.3 is that the excess air coefficient can ensure sufficient ventilation in the combustion stage, and at the same time ensure that the heat is not taken away by the excess air, So as to ensure that the energy recovery and combustion are fully carried out; when the value of the coefficient is greater than the maximum value of the end point of the range, the adverse effect will be that too much air will take away a lot of heat, resulting in the inability to effectively recover energy, thereby increasing the cost. ; When the value of the coefficient is less than the minimum value of the end point of the range, the adverse effect will be that an excessively low coefficient will result in a low air content and cannot ensure sufficient ventilation during the combustion stage.

In some optional embodiments, the mass ratio of water and the coal powder in the mixed slurry is 30%-40%: 60%-70%;

The mass ratio of water in the mixed slurry to the organic waste liquid is 10%-20%: 80%-90%.

In the present application, the positive effect of the mass ratio of water and coal powder in the mixed slurry being 30% to 40%: 60% to 70% is that within the range of this mass ratio, it can ensure the water and coal powder in the mixed slurry. The proportion is appropriate, so as to ensure that the pulverized coal can be fully burned in the subsequent combustion stage, thereby turning the water into a vapor state, which facilitates subsequent energy recovery, thereby reducing production costs; when the value of the mass ratio is greater than the maximum value of the endpoint of the range, the The resulting adverse effect is that an excessively high water content will result in insufficient combustion of the mixed slurry, and heat recovery is difficult. When the value of the mass ratio is less than the minimum value of the endpoint of the range, the adverse effect will be that too much pulverized coal will Increases the cost of auxiliary fuel required for combustion.

The mass ratio of water and organic waste liquid in the mixed slurry is 30% to 40%: 60% to 70%. The positive effect is that within the range of this mass ratio, it can ensure that the ratio of water and organic waste liquid is appropriate, thereby ensuring that In the subsequent combustion stage, the organic waste liquid can be fully burned, thereby turning the water into a vapor state, which is convenient for subsequent energy recovery, thereby reducing production costs; when the value of the mass ratio is greater than the maximum value of the end point of the range, it will lead to adverse effects If the water content is too high, the organic waste liquid of the mixed slurry cannot be fully burned, and the heat recovery is difficult. When the value of the mass ratio is less than the minimum value of the end point of the range, the adverse effect will be excessive organic waste liquid. It cannot be fully burned, which affects the recovery of heat.

In some optional embodiments, the moisture content of the high-water content organic waste liquid is greater than 70%, and the moisture content of the concentrated liquid is 10% to 20%.

In the present application, the positive effect that the moisture content of the concentrated organic waste liquid is 10% to 20% is to ensure that the moisture content in the concentrated liquid containing the concentrated organic waste liquid is within an appropriate range, thereby ensuring that the organic waste liquid can be burned ; When the value of the moisture content is greater than the endpoint maximum value of the range, the unfavorable effect will be that too much moisture will cause the organic waste liquid to fail to burn, and when the moisture content is less than the endpoint minimum value of the range, it will cause unfavorable effects. The effect is that too low moisture will cause the heat of the organic waste liquid to not be converted after combustion, so that it cannot be effectively recycled, resulting in waste of heat and increased production costs.

In some optional embodiments, the ratio of the heat input power of the concentrate to the heat input power of the pulverized coal is 1:2-5;

And/or, the ratio of the flow rate of the concentrate to the flow rate of the pulverized coal is 2-10:1.

In this application, the positive effect of the ratio of the heat input power of the concentrated liquid containing the concentrated organic waste liquid to the heat input power of the pulverized coal is 1:2 to 5 is that within this ratio range, it can ensure that the organic waste liquid and the pulverized coal can Carry out sufficient combustion to ensure that the organic waste liquid is fully burned; when the value of the proportion is greater than or less than the end value of the range, the adverse effect will be that the pulverized coal and the organic waste liquid cannot be fully burned.

The positive effect of the ratio of the flow rate of the concentrated liquid containing the concentrated organic waste liquid to the flow rate of the pulverized coal is 2 to 10:1 is that within this ratio range, the organic waste liquid and the pulverized coal can be fully mixed, and the subsequent combustion can be fully ensured. ; When the value of the ratio is greater than or less than the end value of the range, the adverse effect will be that the organic waste liquid and the pulverized coal cannot be fully mixed.

In some optional embodiments, the mixed slurry is atomized and then combusted to obtain the residual heat of the flue gas after combustion, and then, including:

S5. heat-exchange the waste heat of the flue gas after the combustion and the combustion air to obtain the air after the heat exchange;

The temperature of the air after the heat exchange is 373K-473K.

In the present application, the positive effect that the end temperature of the air after heat recovery is 373K to 473K is that under the condition of this temperature, it can ensure that the air before the next combustion is fully heated, and at the same time, it can realize the recycling of the heat after the combustion .

In an embodiment of the present application, as shown in Figure 2 and Figure 3, a high water content organic waste liquid incineration system is provided, the system is adapted to the method, and the system includes:

The waste liquid storage unit 1 is used for storing organic waste liquid with high water content, wherein, the waste liquid storage unit 1 can be a waste liquid storage tank, a waste liquid storage tank or a waste liquid storage bottle;

The waste liquid concentration unit 2, the liquid outlet of the waste liquid storage unit 1 is connected to the liquid inlet of the waste liquid concentration unit 2, and is used for converting the high-water content organic waste liquid into a concentrated organic waste liquid containing concentrated organic waste liquid. liquid, wherein the waste liquid concentration unit 2 can be a rotary evaporator;

The stirring and mixing unit 3, the liquid outlet of the waste liquid concentration unit 2 is connected to the liquid inlet of the stirring and mixing unit 3, and is used for fully mixing the pulverized coal and the concentrated liquid; the stirring and mixing unit 3 includes the pulverized coal The feeding part 31 and the pulping part 32, the pulping part 32 includes a first feeding port and a second feeding port, and the discharge port of the waste liquid concentration unit 2 communicates with the first feeding port of the pulping part 32. The discharge port of the pulverized coal feeding part 31 is connected to the second feeding port of the pulping part 32, wherein the pulping part 32 can be a pulping device such as a pulper or a beating tank, and the pulverized coal feeding The section 31 includes a coal bunker and a coal mill, the discharge port of the coal bunker is connected to the feed port of the coal mill, and the discharge port of the coal mill is connected to the feed port of the pulping section 32;

Combustion unit 4, the feed port of the combustion unit 4 is connected to the discharge port of the pulping part 32, the combustion unit 4 includes a combustion furnace 41 and an atomizer 42, and the feed port of the atomizer 42 communicated with the discharge port of the pulping part 32, the atomizer 42 is arranged in the combustion furnace 41, and is used for atomizing and burning the mixed slurry;

The air inlet unit 5, the air outlet of the air inlet unit 5 is connected to the air inlet of the combustion unit 4, and is used to provide the air required for the combustion unit 4 to burn; the air inlet unit 5 includes a blower 51, a Heater 52 and N-stage ventilation duct 53, the heat exchanger 52 includes a first air inlet and a second air inlet, the air outlet of the blower 51 is connected to the first air inlet of the heat exchanger 52, so The air outlet of the combustion furnace 41 is connected to the second air inlet of the heat exchanger 52, and the air outlet of the heat exchanger 52 is connected to the air inlet of the N-stage ventilation duct 53, wherein N≥3 and N is an integer .

In some optional embodiments, the N-stage ventilation duct 53 includes a first ventilation duct 531 , a second ventilation duct 532 and a third ventilation duct 533 . The first ventilation duct 531 and the second ventilation duct 532 and the air inlet of the third ventilation duct 533 are connected to the air outlet of the heat exchanger 52, and the air outlets of the first ventilation duct 531, the second ventilation duct 532 and the third ventilation duct 533 are all connected to the air outlet of the heat exchanger 52. The air inlet of the combustion furnace 41 is communicated.

In this application, through the N-section ventilation duct 53 including the first ventilation duct 531, the second ventilation duct 532 and the third ventilation duct 533, different degrees of combustion of the organic waste liquid are realized by controlling different ventilation ducts, such as: After the mixed slurry is atomized, open the first ventilation duct 531 to allow air to enter, then burn the mixed slurry to achieve preliminary combustion of the mixed slurry, and then open the second ventilation duct 532. At this time, the first ventilation can be closed or maintained according to the actual situation. The ventilation duct 531 is used to further burn the mixed slurry after preliminary combustion, and then open the third ventilation duct 533. At this time, the first ventilation duct 531 and the second ventilation duct 532 can be closed or maintained according to the actual situation. The liquid is completely burned, and different degrees of heat recycling are realized by using different sections of ventilation pipes.

In some optional embodiments, the heat exchanger 52 includes a first gas outlet and a second gas outlet, and the system further includes an exhaust gas treatment unit 6, and an air inlet of the exhaust gas treatment unit 6 communicates with the heat exchanger The second air outlet of the heat exchanger 52, the first air outlet of the heat exchanger 52 communicates with the air inlets of the first ventilation duct 531, the second ventilation duct 532 and the third ventilation duct 533, wherein the exhaust gas The treatment unit 6 may be a chimney, an exhaust gas kiln or an exhaust gas cleaner.

In the present application, by adopting the exhaust gas treatment unit 6, the exhaust gas after the combustion of the organic waste liquid is discharged through the exhaust gas treatment unit, thereby ensuring that water vapor or combustion exhaust gas is discharged through the exhaust gas treatment unit 6, thereby realizing energy saving and environmental protection.

Example 1

As shown in Figure 1, a kind of incineration method of high water content organic waste liquid, described method comprises:

S1. Obtaining organic waste liquid with high water content;

s2. Concentrating the high-water content organic waste liquid to obtain a concentrated solution of the organic waste liquid;

S3. adding pulverized coal to the concentrated liquid containing concentrated organic waste liquid and stirring and mixing to obtain the mixed slurry of "water-coal-organic waste liquid concentrated liquid";

S4. Atomizing the mixed slurry and post-combustion to obtain the residual heat of the flue gas after combustion;

s5. Exchanging the residual heat of the flue gas after combustion with the combustion air to obtain the air after heat exchange;

The temperature of the air after heat exchange is 450K;

Among them, N grade air is introduced into the combustion stage, N≥3 and N is an integer.

The number of air stages introduced in the combustion stage is three, and the total amount of air introduced in the combustion stage includes the air volume of the primary air, the air volume of the secondary air and the air volume of the tertiary air; in terms of mass fraction, the air volume of the primary air accounts for the total air volume. 50% of the total air volume, the secondary air volume accounts for 40% of the total air volume, and the tertiary air volume accounts for 10% of the total air volume.

The excess air coefficient of the air introduced in the combustion stage is 1.2.

The mass ratio of water and pulverized coal in the mixed slurry is 35%:65%;

The mass ratio of water and organic waste liquid in the mixed slurry is 15%:85%.

The moisture content of the organic waste liquid with high water content is more than 70%, and the moisture content of the concentrated liquid containing the concentrated organic waste liquid is 15%.

The ratio of the heat input power of the concentrated liquid containing the concentrated organic waste liquid to the heat input power of the pulverized coal is 1:3;

The ratio of the flow rate of the concentrated liquid containing the concentrated organic waste liquid to the flow rate of the pulverized coal is 6:1.

As shown in Figure 2 and Figure 3, an incineration system for organic waste liquid with high water content, the system is adapted to the method, and the system includes:

Waste liquid storage unit 1, used to store organic waste liquid with high water content;

The waste liquid concentration unit 2, the liquid outlet of the waste liquid storage unit 1 is connected to the liquid inlet of the waste liquid concentration unit 2, and is used for converting the high-water content organic waste liquid into a concentrated liquid containing concentrated organic waste liquid;

The stirring and mixing unit 3, the liquid outlet of the waste liquid concentration unit 2 is connected to the liquid inlet of the stirring and mixing unit 3, for fully mixing the pulverized coal and the concentrated liquid containing the concentrated organic waste liquid; the stirring and mixing unit 3 includes a pulverized coal feeding part 31 and the pulping part 32, the pulping part 32 includes a first feeding port and a second feeding port, the discharge port of the waste liquid concentration unit 2 is connected to the first feeding port of the pulping part 32, and the pulverized coal feeding part 31 The discharge port is connected to the second feed port of the pulping part 32;

Combustion unit 4, the feed port of the combustion unit 4 is connected to the discharge port of the pulping part 32, the combustion unit 4 includes a combustion furnace 41 and an atomizer 42, and the feed port of the atomizer 42 is connected to the discharge of the pulping part 32 The atomizer 42 is arranged in the combustion furnace 41 for atomizing and burning the mixed slurry;

The air inlet unit 5, the air outlet of the air inlet unit 5 is connected to the air inlet of the combustion unit 4, and is used to provide the air required for the combustion unit 4 to burn; the air inlet unit 5 includes a blower 51, a heat exchanger 52 and an N section The ventilation duct 53, the heat exchanger 52 includes a first air inlet and a second air inlet, the air outlet of the blower 51 is connected to the first air inlet of the heat exchanger 52, and the air outlet of the combustion furnace 41 is connected to the first air inlet of the heat exchanger 52. Two air inlets, the air outlet of the heat exchanger 52 is connected to the air inlet of the N-stage ventilation duct 53, wherein N≥3 and N is an integer.

The N-stage ventilation duct 53 includes a first ventilation duct 531 , a second ventilation duct 532 and a third ventilation duct 533 . The air inlets of the first ventilation duct 531 , the second ventilation duct 532 and the third ventilation duct 533 are all connected to the heat exchanger 52 The air outlets of the first ventilation duct 531 , the second ventilation duct 532 and the third ventilation duct 533 are all connected to the air inlet of the combustion furnace 41 .

The heat exchanger 52 includes a first air outlet and a second air outlet, and the system further includes an exhaust gas treatment unit 6, the air inlet of the exhaust gas treatment unit 6 is connected to the second air outlet of the heat exchanger 52, and the first outlet of the heat exchanger 52 is connected. The air port communicates with the air inlets of the first ventilation duct 531 , the second ventilation duct 532 and the third ventilation duct 533 .

Example 2

Comparing Embodiment 2 and Embodiment 1, the difference between Embodiment 2 and Embodiment 1 is:

The temperature of the air after heat exchange is 373K;

In terms of mass fraction, the air volume of the primary air accounts for 55% of the total air volume, the air volume of the secondary air accounts for 40% of the total air volume, and the air volume of the tertiary air accounts for 5% of the total air volume.

The excess air coefficient of the air introduced in the combustion stage is 1.1.

The mass ratio of water and pulverized coal in the mixed slurry is 30%:60%;

The mass ratio of water and organic waste liquid in the mixed slurry is 10%:90%.

The moisture content of the concentrate containing the concentrated organic waste liquid was 10%.

The ratio of the heat input power of the concentrated liquid containing the concentrated organic waste liquid to the heat input power of the pulverized coal is 1:5;

The ratio of the flow rate of the concentrated liquid containing the concentrated organic waste liquid to the flow rate of the pulverized coal is 2:1.

Example 3

Comparing Embodiment 3 and Embodiment 1, the difference between Embodiment 3 and Embodiment 1 is:

The temperature of the air after heat exchange is 473K;

In terms of mass fraction, the air volume of the primary air accounts for 45% of the total air volume, the air volume of the secondary air accounts for 40% of the total air volume, and the air volume of the tertiary air accounts for 15% of the total air volume.

The excess air coefficient of the air introduced in the combustion stage is 1.3.

The mass ratio of water and coal powder in the mixed slurry is 40%:70%;

The mass ratio of water and organic waste liquid in the mixed slurry is 20%:80%.

The moisture content of the high-water content organic waste liquid is greater than 70%, and the moisture content of the concentrated liquid containing the concentrated organic waste liquid is 20%.

The ratio of the heat input power of the concentrated liquid containing the concentrated organic waste liquid to the heat input power of the pulverized coal is 1:2;

The ratio of the flow rate of the concentrated liquid containing the concentrated organic waste liquid to the flow rate of the pulverized coal is 10:1.

Comparative Example 1

Comparing Comparative Example 1 and Example 1, the difference between Comparative Example 1 and Example 1 is:

Use primary ventilation.

Comparative Example 2

Comparing Comparative Example 2 and Example 1, the difference between Comparative Example 2 and Example 1 is:

In terms of mass fraction, the air volume of the primary air accounts for 45% of the total air volume, the air volume of the secondary air accounts for 45% of the total air volume, and the air volume of the tertiary air accounts for 10% of the total air volume.

The excess air factor of the air introduced in the combustion stage is 1.0.

The mass ratio of water and coal powder in the mixed slurry is 20%:80%;

The mass ratio of water and organic waste liquid in the mixed slurry is 5%:95%.

The moisture content of the shrunk organic waste liquid was 5%.

The ratio of the heat input power of the concentrated liquid containing the concentrated organic waste liquid to the heat input power of the pulverized coal is 1:1;

The ratio of the flow rate of the concentrated liquid containing the concentrated organic waste liquid to the flow rate of the pulverized coal is 1:1.

Comparative Example 3

Comparing Comparative Example 3 and Example 1, the difference between Comparative Example 3 and Example 1 is:

In terms of mass fraction, the air volume of the primary air accounts for 55% of the total air volume, the air volume of the secondary air accounts for 35% of the total air volume, and the air volume of the tertiary air accounts for 10% of the total air volume.

The excess air factor of the air introduced in the combustion stage is 1.5.

The mass ratio of water and pulverized coal in the mixed slurry is 50%:50%;

The mass ratio of water and organic waste liquid in the mixed slurry is 30%:70%.

The moisture content of the concentrate containing the concentrated organic waste liquid was 25%.

The ratio of the heat input power of the concentrated liquid containing the concentrated organic waste liquid to the heat input power of the pulverized coal is 1:6;

The ratio of the flow rate of the concentrated liquid containing the concentrated organic waste liquid to the flow rate of the pulverized coal was 11:1.

Related experiments:

The heat loss rate and the residual rate of organic waste liquid in the process of Example 1-3 and Comparative Example 1-2 were counted, and the results are shown in Table 1.

Test methods for related experiments:

Heat loss rate: count the heat generated by the combustion furnace 41 after combustion, the exchange heat of the heat exchanger 52, the heat loss of the pipeline itself, and the theoretical total combustion of the organic waste liquid, wherein the heat loss rate=1-(Theoretical combustion The total amount - the heat generated by the combustion furnace 41 - the exchange heat of the heat exchanger 52 - the heat loss of the pipeline itself) / the theoretical total amount of combustion.

Residual rate of organic waste liquid: count the weight of the concentrated liquid containing concentrated organic waste liquid added before combustion and the weight of organic waste liquid after combustion treatment, the residual rate of organic waste liquid = the weight of organic waste liquid after combustion treatment/contained The weight of the concentrate of the concentrated organic waste liquid.

Table 1

category Heat loss rate (%) Residual rate of organic waste liquid (%) Example 1 15 0.5 Example 2 17 0.4 Example 3 18 0.8 Comparative Example 1 31 3.2 Comparative Example 2 25 2.3 Comparative Example 3 twenty four 2.5

Table 1 specific analysis:

The heat loss rate refers to the loss of heat generated by the combustion of organic waste liquid after being processed by the method and system of the present application. The lower the heat loss rate, the higher the utilization of heat in the method and system.

The residual rate of organic waste liquid refers to the residual degree of organic waste liquid after being processed by the method and system of the present application. When the residual rate of organic waste liquid is lower, it means that the degree of combustion of organic waste liquid is more complete.

From the data of Examples 1-3, it can be known that:

By adopting the method of the present application, by first concentrating the high-water content organic waste liquid into a low-water content organic waste liquid, and then adding pulverized coal into the concentrated liquid containing the concentrated organic waste liquid to form a water-coal-waste liquid complex, Then, the water-coal-waste liquid compound is atomized and then burned, and the heat after combustion is fully utilized to achieve full recovery of heat, and at the same time, the organic waste liquid is completely burned.

From the data of Comparative Examples 1-3, it can be seen that:

If the ventilation method of the present application is not adopted or the process condition parameters of the present application are exceeded, the heat loss after the combustion of the organic waste liquid will be caused, and part of the organic waste liquid will be incompletely burned.

One or more technical solutions in the embodiments of the present application also have at least the following technical effects or advantages:

(1) The method provided by the embodiment of the present application, by first concentrating the high water content organic waste liquid into a low water content organic waste liquid to the high water content organic waste liquid, and then adding pulverized coal to the organic waste liquid containing the concentrated organic waste liquid The water-coal-waste liquid complex is formed in the concentrated liquid, and then the water-coal-waste liquid complex is atomized, so as to facilitate the combustion of organic waste liquid and make it fully burned, and use pulverized coal instead of natural gas to achieve low organic waste liquid. Scaled processing of costs.

(2) In the method provided by the embodiments of the present application, since pulverized coal is used as auxiliary fuel, since most of the pulverized coal in our country is inferior coal or surface coal, it is converted into pulverized coal, which can increase the effectiveness of the inferior coal or surface coal. use.

(3) The system provided in the embodiment of the present application can effectively provide air during the combustion of organic waste liquid by adopting the N-stage ventilation duct 53 including the first ventilation duct 531, the second ventilation duct 532 and the third ventilation duct 533 , so that the organic waste liquid is fully burned.

(4) In the system provided in the embodiment of the present application, the heat exchanger 52 realizes the control of the heat of the air entering the combustion furnace 41, which can further improve the degree of heat recovery and utilization.

It should be noted that, in this document, relational terms such as "first" and "second" etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. the incineration method of a high water content organic waste liquid, is characterized in that, described method comprises: Obtain high water content organic waste liquid; Concentrating the high-water content organic waste liquid to obtain a concentrated solution of the organic waste liquid; The pulverized coal is added to the concentrated solution for stirring and mixing to obtain a mixed slurry of "water-coal-organic waste liquid concentrated solution"; Atomizing the mixed slurry and post-combustion to obtain the residual heat of the flue gas after combustion; Among them, N grade air is introduced into the combustion stage, N≥3 and N is an integer. 2 . The method according to claim 1 , wherein the number of air stages introduced in the combustion stage is three, and the total amount of air introduced in the combustion stage includes the air volume of primary air and the air volume of secondary air. 3 . and tertiary air volume; In terms of mass fraction, the air volume of the primary air accounts for 45% to 55% of the total air volume, the air volume of the secondary air accounts for 35% to 45% of the total air volume, and the air volume of the tertiary air accounts for 35% to 45% of the total air volume. Account for 5% to 15% of the total amount of air. 3 . The method according to claim 1 or 2 , wherein the excess air coefficient of the air introduced in the combustion stage is 1.1-1.3. 4 . 4. The method according to claim 1, wherein the mass ratio of water and the coal powder in the mixed slurry is 30%-40%: 60%-70%; The mass ratio of water in the mixed slurry to the organic waste liquid is 10%-20%: 80%-90%. 5 . The method according to claim 1 , wherein the moisture content of the high-water content organic waste liquid is greater than 70%, and the moisture content of the concentrated liquid is 10% to 20%. 6 . 6. The method according to claim 1, wherein the ratio of the heat input power of the concentrated solution to the heat input power of the pulverized coal is 1:2-5; And/or, the ratio of the flow rate of the concentrate to the flow rate of the pulverized coal is 2-10:1. 7. The method according to claim 1, characterized in that, the described mixed slurry is atomized, post-combusted to obtain the residual heat of the flue gas after combustion, and then, comprising: exchanging the residual heat of the flue gas after the combustion with the combustion air to obtain the air after the heat exchange; The temperature of the air after the heat exchange is 373K-473K. 8. An incineration system for organic waste liquid with high water content, wherein the system is adapted to the method according to any one of claims 1-7, and the system comprises: A waste liquid storage unit (1) for storing organic waste liquid with high water content; The waste liquid concentration unit (2), the liquid outlet of the waste liquid storage unit (1) is connected to the liquid inlet of the waste liquid concentration unit (2), and is used for converting the high water content organic waste liquid into a liquid containing waste liquid. Concentrate of concentrated organic waste liquid; a stirring and mixing unit (3), the liquid outlet of the waste liquid concentration unit (2) is connected to the liquid inlet of the stirring and mixing unit (3), and is used for fully mixing the pulverized coal and the concentrated liquid; the stirring The mixing unit (3) includes a pulverized coal feeding part (31) and a pulping part (32), the pulping part (32) includes a first feeding port and a second feeding port, and the waste liquid concentration unit (2) ) is connected to the first feed port of the pulping part (32), and the discharge port of the pulverized coal feeding part (31) is connected to the second feed port of the pulping part (32); A combustion unit (4), the feed port of the combustion unit (4) communicates with the discharge port of the pulping part (32), the combustion unit (4) includes a combustion furnace (41) and an atomizer (42) ), the feeding port of the atomizer (42) communicates with the discharging port of the pulping part (32), and the atomizer (42) is arranged in the combustion furnace (41) for converting The mixed slurry is atomized and burned; an air inlet unit (5), the air outlet of the air inlet unit (5) is connected to the air inlet of the combustion unit (4), and is used for providing the air required by the combustion unit (4) for combustion; the air inlet unit (5) comprising a blower (51), a heat exchanger (52) and an N-stage ventilation duct (53), the heat exchanger (52) comprising a first air inlet and a second air inlet, the blower The air outlet of (51) communicates with the first air inlet of the heat exchanger (52), and the air outlet of the combustion furnace (41) communicates with the second air inlet of the heat exchanger (52). The air outlet of the device (52) communicates with the air inlet of the N-stage ventilation duct (53), wherein N≧3 and N is an integer. 9. The system according to claim 8, wherein the N-stage ventilation duct (53) comprises a first ventilation duct (531), a second ventilation duct (532) and a third ventilation duct (533), so The air inlets of the first ventilation duct (531), the second ventilation duct (532) and the third ventilation duct (533) are all connected to the air outlet of the heat exchanger (52). The air outlets of the duct (531), the second ventilation duct (532) and the third ventilation duct (533) all communicate with the air inlet of the combustion furnace (41). 10. The system according to claim 9, wherein the heat exchanger (52) comprises a first gas outlet and a second gas outlet, the system further comprises an exhaust gas treatment unit (6), the exhaust gas treatment The air inlet of the unit (6) communicates with the second air outlet of the heat exchanger (52), and the first air outlet of the heat exchanger (52) communicates with the first ventilation duct (531), the first air outlet The air inlet of the second ventilation duct (532) and the third ventilation duct (533).

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