CN218422835U - System for preparing dephosphorization adsorbent based on coal gangue pyrolysis - Google Patents

Abstract

The utility model provides a system based on gangue pyrolysis preparation dephosphorization adsorbent. The system comprises: the device comprises a crusher, a first drying device, a pyrolysis device and a hydrothermal reaction unit. The utility model discloses a resource utilization of gangue to the preparation has obtained the dephosphorization adsorbent that has outstanding dephosphorization adsorption efficiency.

Description

System for preparing dephosphorization adsorbent based on coal gangue pyrolysis

Technical Field

The utility model relates to a solid waste utilization field particularly, relates to a system based on phosphorus adsorbent is removed in preparation of gangue pyrolysis.

Background

Coal gangue is solid waste generated in the production and processing processes of coal, the annual emission amount is about 10% of the annual coal yield, the coal gangue is one of the most serious solid waste with the largest emission amount and the most serious floor area problem in China at present, and a reliable and effective scientific and technical means is urgently needed to realize the recycling, reduction and harmless utilization of the coal gangue. The biochar is a solid carbon material obtained by pyrolyzing part of solid wastes including coal gangue under an anaerobic condition, has the performance advantages of more pores and large specific surface area, and has the economic advantages of rich raw material sources and low price, so the biochar is often used as a main carrier of an adsorbent in the field of removing water pollutants.

In recent years, the social productivity level of China is continuously improved, a plurality of environmental problems are increasingly acute, and the discharge of municipal sewage is one of the pain problems. The municipal sewage has high content of nitrogen and phosphorus elements, and the direct discharge of the municipal sewage causes the risk of water eutrophication and has serious influence on the ecological environment. The common methods for removing phosphorus from sewage at present mainly comprise an adsorption method, a chemical precipitation method, a biological removal method and the like. Among them, the adsorption method has advantages of high efficiency, convenience and low cost, and thus is widely used.

However, the existing phosphorus removal adsorbent generally has the problems of limited adsorption efficiency, difficult subsequent treatment and the like. Therefore, an adsorbent with excellent performance, convenient treatment and low cost is urgently needed at present, and the technical route of treating the phosphorus-containing sewage by using an adsorption method is a key breakthrough.

Based on this, it is necessary to provide a new system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis, so as to solve the problems of insufficient adsorption efficiency and difficult post-treatment of the phosphorus removal adsorbent in the prior art on the basis of resource utilization of coal gangue.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a system based on phosphorus adsorbent is removed in preparation of gangue pyrolysis to on the basis of utilization gangue, solve the problem that phosphorus adsorbent adsorption efficiency is not enough among the prior art, the aftertreatment difficulty.

In order to achieve the above object, according to an aspect of the present invention, there is provided a system for preparing a phosphorus removal adsorbent based on pyrolysis of coal gangue, the system comprising:

the crusher is used for crushing the coal gangue raw material to obtain a crushed material;

the first drying equipment is connected with the crusher and used for drying the crushed materials to obtain dry materials;

the pyrolysis equipment is connected with the first drying equipment and is used for pyrolyzing the dry materials to obtain biochar and combustible oil gas; the pyrolysis equipment is provided with a first heat medium inlet, a first heat medium outlet, a combustible oil gas outlet and a biochar outlet;

the combustion equipment is connected with the combustible oil gas outlet and is used for combusting the combustible oil gas to obtain high-temperature flue gas; the combustion equipment is provided with a high-temperature flue gas outlet, and the high-temperature flue gas outlet is connected with a first heat medium inlet of the pyrolysis equipment;

the hydrothermal reaction unit is provided with a biochar inlet and a second heat medium inlet, the biochar inlet is connected with the combustion equipment, and the second heat medium inlet is connected with the first heat medium outlet; the hydrothermal reaction unit is used for enabling the biochar to carry out hydrothermal reaction with the ferro-aluminous sulphate and the water so as to obtain the dephosphorization adsorbent.

Further, the hydrothermal reaction unit is a hydrothermal reactor, and the hydrothermal reactor is provided with a biochar inlet and a second heat medium inlet.

Further, the hydrothermal reaction unit comprises a hydrothermal reactor and a heat exchanger, the hydrothermal reactor is provided with a charcoal inlet and a water inlet, the heat exchanger is provided with a heat exchange channel and a heat medium channel, the inlet of the heat medium channel is a second heat medium inlet, and the heat exchange channel is connected with the water inlet to supply water to the hydrothermal reactor.

Further, the system further comprises:

and the storage bin is connected with the crusher and is used for storing and providing the coal gangue raw material for the crusher.

Further, the system further comprises:

and the second drying device is connected with the hydrothermal reactor and is used for drying the phosphorus removal adsorbent.

Further, the hydrothermal reactor is a hydrothermal synthesis reaction kettle.

Further, the heat exchanger is a gas-liquid plate heat exchanger.

Further, the combustion equipment is an oil-gas dual-purpose combustor.

Further, the pyrolysis apparatus is a rotary kiln.

Further, the first drying apparatus and the second drying apparatus are belt dryers.

The utility model provides a system based on gangue pyrolysis preparation dephosphorization adsorbent, it obtains the biochar based on the gangue pyrolysis to carry out follow-up activation modification treatment with it as main carrier, the preparation dephosphorization adsorbent has reached following technological effect: firstly, the recycling, reduction and harmlessness of the coal gangue are realized, the system of the invention prepares the adsorbent by using the coal gangue which is a raw material with wide sources, the cost is low, the process is simple, and the economic efficiency is extremely high; secondly, the system further prepares the phosphorus removal adsorbent by pyrolyzing biochar by coal gangue, and because the biochar by the coal gangue has a good surface structure, more pores and better activity, the prepared phosphorus removal adsorbent has excellent phosphorus removal adsorption capacity and can efficiently recover phosphorus in sewage. Therefore, the invention solves the problem of sewage treatment while recycling the coal gangue. Particularly, the phosphorus removal adsorbent prepared by the system can be used as a fertilizer or soil conditioner rich in nutrient elements after adsorbing and removing phosphorus from sewage, so that the post-treatment is simple, and the resource value is continuously and fully realized in the subsequent treatment.

Meanwhile, the utility model discloses a hot medium tube coupling between pyrolysis equipment, combustion apparatus, the hydrothermal reaction unit for the produced high temperature flue gas of combustible oil gas after the burning of pyrolysis process production can be for the system self-heating, has realized the maximize utilization of material, energy, has further avoided the waste of resource, has low energy consumption, environment-friendly beneficial effect. Therefore, on the basis of recycling the coal gangue, the invention effectively solves the problems of insufficient adsorption efficiency and difficult post-treatment of the phosphorus removal adsorbent in the prior art. Meanwhile, the method also has the advantages of low consumption and environmental protection.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic flow diagram of a system for preparing a phosphorus removal adsorbent based on coal gangue pyrolysis according to an embodiment of the present invention; and

fig. 2 shows a schematic flow diagram of a system for preparing a phosphorus removal adsorbent based on coal gangue pyrolysis according to another embodiment of the invention.

Wherein the figures include the following reference numerals:

1. a storage bin; 2. a crusher; 3. a first drying device; 4. a pyrolysis device; 5. a combustion device; 6. a hydrothermal reactor; 7. a second drying device; 8. a heat exchanger.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As described in the background art, the problems of the prior art that the coal gangue is not effectively recycled, the adsorption efficiency of the existing adsorbent is limited, and the subsequent treatment is difficult are solved.

In order to solve the above problems, the present invention provides a system for preparing a phosphorus removal adsorbent based on coal gangue pyrolysis, as shown in fig. 1 or fig. 2, the system comprises a crusher 2, a first drying device 3, a pyrolysis device 4, a combustion device 5, and a hydrothermal reaction unit; the crusher 2 is used for crushing the coal gangue raw material to obtain a crushed material; the first drying device 3 is connected with the crusher 2, and the first drying device 3 is used for drying the crushed materials to obtain dry materials; the pyrolysis device 4 is connected with the first drying device 3, and the pyrolysis device 4 is used for pyrolyzing the dry materials to obtain biochar and combustible oil gas; the pyrolysis equipment is provided with a first heat medium inlet, a first heat medium outlet, a combustible oil gas outlet and a biochar outlet; the combustion equipment 5 is connected with the combustible oil gas outlet, and the combustion equipment 5 is used for combusting the combustible oil gas to obtain high-temperature flue gas; a high-temperature flue gas outlet of the combustion device 5 is connected with a first heat medium inlet of the pyrolysis device 4; the hydrothermal reaction unit is provided with a biochar inlet and a second heat medium inlet, the biochar inlet is connected with the combustion equipment 5, and the second heat medium inlet is connected with the first heat medium outlet; the hydrothermal reaction unit is used for enabling the biochar to carry out hydrothermal reaction with the ferro-aluminous sulphate and the water so as to obtain the dephosphorization adsorbent.

When the system is used for preparing the phosphorus removal adsorbent, the coal gangue raw material is firstly crushed in the crusher 2 to obtain a crushed material. Then, the crushed material is put into a first drying device 3 for first drying to obtain a dry material, which is prepared for subsequent pyrolysis. And pyrolyzing the dry materials in the pyrolysis equipment 4 to obtain the biochar and combustible oil gas. And carrying out hydrothermal reaction on the obtained biochar, the iron-aluminum alum and the water in a hydrothermal reaction unit to obtain the dephosphorizing adsorbent. In addition, after the combustible oil gas is combusted in the combustion equipment 5 to obtain high-temperature flue gas, the high-temperature flue gas can enter the pyrolysis equipment 4 through the first heat medium inlet to serve as at least part of heat sources, and middle-temperature flue gas is discharged; then the middle-temperature flue gas can enter the hydrothermal reaction unit through a second heat medium inlet to be used as at least part of a heat source.

The utility model discloses obtain the biochar based on the gangue pyrolysis to carry out follow-up activation modification treatment with it as main carrier, the preparation removes the phosphorus adsorbent, has reached following technological effect: firstly, the recycling, reduction and harmlessness of the coal gangue are realized, the system in the utility model utilizes the coal gangue which is a raw material with wide sources to prepare the adsorbent, and has low cost, simple process and high economy; and secondly, the utility model discloses a system has further prepared the dephosphorization adsorbent with gangue pyrolysis biochar, because this biochar has good surface structure, the hole is many, specific surface area is big, and active preferred can adsorb the total phosphorus in the sewage among activated carbon surface and pore, and the dephosphorization adsorbent that consequently the preparation obtained can carry out high-efficient recovery to the phosphorus in the sewage in order to have excellent dephosphorization adsorption efficiency who expects. Therefore, the utility model discloses the problem of sewage treatment has been solved in resource utilization gangue. Especially, adopt the utility model discloses the dephosphorization adsorbent of system preparation can form the granule that uses the biochar as "kernel", the structure is inseparable and settling property is good after adsorbing the dephosphorization to sewage, and this granule is convenient for separate recovery, and can regard as a fertilizer or soil amendment that is rich in nutrient element, and not only the aftertreatment is simple, and continues fully to realize the resourceful value in follow-up processing.

Meanwhile, the utility model discloses a hot medium tube coupling between pyrolysis equipment, combustion apparatus, the hydrothermal reaction unit for the produced high temperature flue gas of combustible oil gas after the burning of pyrolysis process production can be for the system self-heating, has realized the maximize utilization of material, energy, has further avoided the waste of resource, has low energy consumption, environment-friendly beneficial effect. Therefore, the utility model discloses on the basis of utilization gangue, effectively solved among the prior art remove the problem that phosphorus adsorbent adsorption efficiency is not enough, the aftertreatment difficulty. Meanwhile, the method also has the advantages of low consumption and environmental protection.

In order to further improve the utilization efficiency of heat energy from the system structure, as shown in fig. 1, the hydrothermal reaction unit is a hydrothermal reactor 6, and the hydrothermal reactor 6 has a biochar inlet and a second heat medium inlet; alternatively, as shown in fig. 2, the hydrothermal reaction unit includes a hydrothermal reactor 6 and a heat exchanger 8, the hydrothermal reactor 6 has a charcoal inlet and a water inlet, the heat exchanger 8 has a heat exchange channel and a heat medium channel, the inlet of the heat medium channel is a second heat medium inlet, and the heat exchange channel is connected to the water inlet to supply water to the hydrothermal reactor 6. In the first mode, the high-temperature flue gas directly enters the hydrothermal reactor for heat supply after passing through the pyrolysis device 4. In the second mode, the high-temperature flue gas passes through the pyrolysis device 4 and then preheats the water participating in the hydrothermal reaction, and the high-temperature flue gas also serves as a heat source to participate in the hydrothermal reaction. In a specific implementation process, the high-temperature flue gas may be used as a heat source for part or all of the pyrolysis reaction and the hydrothermal reaction, and when the heat is insufficient, an external heat source may be used to supply heat for the two-step reaction, which is understood by those skilled in the art and will not be described herein again.

Preferably, the system further comprises a storage bin 1 connected to the crusher 2 for storing and transporting the coal gangue material to the crusher 2. The coal gangue storage bin 1 originally arranged in the coal plant can save occupied area and cost by utilizing original equipment resources.

In order to further improve the dryness of the phosphorus removal adsorbent, facilitate transportation, and better maintain the activity thereof, it is preferable that the system further comprises a second drying device 7 for performing a second drying process on the phosphorus removal adsorbent. More preferably, the temperature of the second drying treatment is 200 to 250 ℃.

Further, in order to better adapt the system of the present invention, it is preferred that the hydrothermal reactor 6 is a hydrothermal synthesis reaction kettle.

Further, for better adaptation the system of the present invention, preferably heat exchanger 8 is a gas-liquid plate heat exchanger.

Further, for better adaptation the system of the present invention, the preferred combustion device 5 is a dual purpose burner for oil and gas.

Further, to better adapt the system of the present invention, it is preferred that the pyrolysis apparatus 4 is a rotary kiln.

Further, to better adapt the system in the present invention, it is preferred that the first drying apparatus 3 and the second drying apparatus 7 are belt dryers.

In the system of the utility model, the high-temperature flue gas adopts counter-flow heat exchange for the heat exchange of the pyrolysis equipment, the heat flow outlet is a cold flow inlet, and the heat flow outlet temperature is the medium-temperature flue gas temperature; and the cold flow inlet section is a feeding end of the pyrolysis equipment, does not reach a constant temperature area of the pyrolysis equipment, and has a temperature lower than the pyrolysis temperature. The heat required by the subsequent hydrothermal reaction is considered, and the heat exchanger can be further designed to ensure that the temperature of the outlet medium-temperature flue gas is within the range of 300-400 ℃.

According to another aspect of the present invention, there is also provided a method for preparing a phosphorus removal adsorbent based on coal gangue pyrolysis, which employs the above system, the method comprising the steps of: step S1, crushing a coal gangue raw material to obtain a crushed material; s2, carrying out first drying treatment on the crushed materials to obtain dry materials; s3, pyrolyzing the dry materials to obtain biochar and combustible oil gas; s4, carrying out hydrothermal reaction on the biochar, the iron-aluminum alum and water to obtain a phosphorus removal adsorbent; combusting combustible oil gas to obtain high-temperature flue gas; returning the high-temperature flue gas obtained in the step S4 to the step S3 to be used as at least part of a heat source in the pyrolysis process, and discharging medium-temperature flue gas; the medium temperature flue gas is then returned to step S4 as a heat source for at least part of the hydrothermal reaction. The method prepares the phosphorus removal adsorbent based on coal gangue pyrolysis, and solves the problem of sewage treatment while recycling the coal gangue. Furthermore, the phosphorus removal adsorbent prepared by the method can be used as a fertilizer and a soil conditioner rich in nutrient elements after being processed after adsorbing and removing phosphorus from sewage, so that the post-treatment is simple, and the resource value is continuously and fully realized in the subsequent treatment. In addition, the heat energy of the high-temperature flue gas is fully utilized and is used as at least part of heat source to enter the pyrolysis equipment and the hydrothermal reaction unit, so that the waste of resources is further avoided, and the method has the advantages of low energy consumption and environmental friendliness.

In order to further improve the utilization rate of the heat energy of the flue gas obtained after the combustible oil gas is combusted, in a preferred embodiment, the heat supply mode of the medium-temperature flue gas for the hydrothermal reaction is as follows: directly supplying heat to the hydrothermal reaction; or, the medium-temperature flue gas and water exchange heat, so that the water after heat exchange carries out hydrothermal reaction with the biochar and the aluminoferrite; preferably, the water is preheated to 60-80 ℃ in the process of heat exchange between the medium-temperature flue gas and the water.

In order to better provide a large amount of high-temperature flue gas and ensure that the combustible oil gas can be combusted more completely, in a preferred embodiment, the combustion treatment temperature is 800-900 ℃.

In a preferred embodiment, the pyrolysis temperature is 500-700 ℃ and the pyrolysis time is 30-60 min. Preferably, its pyrolysis is carried out in an inert gas atmosphere, such as a nitrogen atmosphere. The coal gangue pyrolysis is completed under the process condition, the obtained biochar has better adsorption activity, is more suitable as a main raw material of the phosphorus removal adsorbent, and has better promotion effect on the adsorption effect of the phosphorus removal adsorbent. On the other hand, the particle size of the biochar obtained by pyrolysis under the process condition is more suitable, and the phosphorus removal adsorbent is easier to separate after the sewage treatment is completed.

For better preparation of the efficient and easy-to-handle phosphorus removal adsorbent, in a preferred embodiment, the hydrothermal reaction temperature is 150-200 ℃ and the reaction time is 3-4 h. And the mass ratio of the biochar, the iron aluminite and the water is (1-3): (2-4): (3-7), so that more iron salt and aluminum salt can be loaded on the biochar, and the loading is more stable. In the sewage treatment, the iron salt and the aluminum salt can trap activated sludge micelles better by the action of electric charges, and therefore, the ratio of the above reactants is preferred to further improve the adsorption effect. For the purpose of improving the reaction yield and reducing side reactions, the water is preferably deionized water. More preferably, the biochar is first cooled to normal temperature before participating in the hydrothermal reaction.

In order to further improve the sufficient drying and dehydration of the coal gangue crushed material in the first drying treatment process, the particle size of the crushed material is preferably less than 5mm.

In order to further dry the phosphorus removal desiccant on the basis of keeping the activity of the phosphorus removal desiccant, the prepared phosphorus removal adsorbent is preferably subjected to a second drying treatment. More preferably, the temperature of the second drying treatment is 200 to 250 ℃.

The coal gangue raw material can be selected from coal gangue solid wastes which are widely available, and in a preferred embodiment, the calorific value of the coal gangue raw material is 1000-1500 kcal.

The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.

Example 1:

the embodiment provides a device for preparing a phosphorus removal adsorbent based on coal gangue pyrolysis as shown in fig. 1, and the device is used for preparing the phosphorus removal adsorbent, and the specific steps are as follows:

step 1: taking out the coal gangue raw material with the calorific value of 1000-1500 kilocalories from the storage bin, and crushing the coal gangue raw material by a crusher to obtain crushed material with the granularity of less than 5 mm;

step 2: sending the crushed material obtained in the step into first drying equipment (a belt dryer) for drying at the drying temperature of 100-110 ℃ to obtain a dry material;

and step 3: and (3) feeding the dry material obtained in the step (2) into pyrolysis equipment (a rotary kiln) for pyrolysis, wherein the pyrolysis temperature and the pyrolysis time are respectively 500 ℃ and 60min, and thus the biochar and the combustible oil gas are obtained. Collecting the obtained biochar, putting the biochar into a storage bin, cooling to normal temperature, and taking the biochar as a main carrier material of a subsequent adsorbent for later use;

and 4, step 4: and (3) feeding the combustible oil gas obtained in the step (a dual-purpose oil gas burner) into combustion equipment for combustion, wherein the combustion temperature is 900 ℃, and obtaining a large amount of high-temperature flue gas. Arranging corresponding flue gas pipelines in the pyrolysis equipment to ensure that high-temperature flue gas firstly supplies heat for the pyrolysis process and obtain medium-temperature flue gas at 400 ℃ at an outlet; furthermore, a proper flue gas passage is designed in a hydrothermal reactor (hydrothermal synthesis reaction kettle), so that the medium-temperature flue gas can effectively supply heat to the reaction process, and finally the low-temperature flue gas with the temperature of 130 ℃ is discharged;

and 5: and (3) mixing the biochar obtained in the step (3) with iron, aluminum, vanadium and deionized water according to a mass ratio of 2:3:5, adding the mixture into a hydrothermal reactor (hydrothermal synthesis reaction kettle), and separating the reaction temperature and the reaction time into 150 ℃ and 4 hours to obtain the iron-aluminum-vanadium biochar adsorbent;

and 6: and (4) drying the iron-aluminum-vanadium biochar adsorbent obtained in the step (4) through second drying equipment (a belt dryer) to obtain a final outlet adsorbent product which can be used for removing phosphorus elements in sewage and purifying a water body and simultaneously obtaining a phosphorus-containing fertilizer which can be used for subsequent utilization.

And (3) performance characterization:

the adsorbent prepared in the above example is used for treating phosphorus-containing sewage, and the main components of the phosphorus-containing sewage are shown in table 1:

TABLE 1

Composition (I)	TP	CODcr	DO	PH
					Content (wt.)	3.0mg/L	300mg/L	1.2mg/L	6.5

The specific body treatment process comprises the following steps: 50mL of phosphorus-containing wastewater was taken, and added with the phosphorus removal adsorbent prepared in example 1 in an amount of 0.1g, subjected to oscillatory adsorption reaction in a water bath constant temperature oscillator at 26 ℃ for 24 hours, and then the adsorbent was separated from the wastewater by filtration, and the content of non-adsorbed total phosphorus in the wastewater was measured by ammonium molybdate-ascorbic acid colorimetry, and the results of the adsorption amount of the adsorbent on the total phosphorus were obtained as shown in Table 2.

The adsorbent treatment results are shown in table 2:

TABLE 2

Number of	The total phosphorus content of the sewage after the addition of the adsorbent	Phosphorus removal rate
			Example 1	0.47mg/L	84.3％

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

use the utility model discloses, can realize the utilization of gangue to the preparation obtains the dephosphorization adsorbent that has outstanding dephosphorization effect.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A system for preparing a phosphorus removal adsorbent based on coal gangue pyrolysis is characterized by comprising:

the crusher (2) is used for crushing the coal gangue raw material to obtain a crushed material;

a first drying device (3) connected to the crusher (2), the first drying device (3) being adapted to dry the crushed material to obtain a dry material;

the pyrolysis equipment (4) is connected with the first drying equipment (3), and the pyrolysis equipment (4) is used for pyrolyzing the dry materials to obtain biochar and combustible oil gas; the pyrolysis equipment is provided with a first heat medium inlet, a first heat medium outlet, a combustible oil gas outlet and a biochar outlet;

the combustion equipment (5) is connected with the combustible oil gas outlet, and the combustion equipment (5) is used for combusting the combustible oil gas to obtain high-temperature flue gas; the combustion equipment (5) is provided with a high-temperature flue gas outlet which is connected with the first heat medium inlet of the pyrolysis equipment (4);

the hydrothermal reaction unit is provided with a biochar inlet and a second heat medium inlet, the biochar inlet is connected with the combustion equipment (5), and the second heat medium inlet is connected with the first heat medium outlet; the hydrothermal reaction unit is used for enabling the biochar to carry out hydrothermal reaction with the aluminoferrite and the water so as to obtain the dephosphorization adsorbent.

2. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as recited in claim 1, wherein the hydrothermal reaction unit is a hydrothermal reactor (6), and the hydrothermal reactor (6) is provided with the biochar inlet and a second heat medium inlet.

3. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as defined in claim 1, wherein the hydrothermal reaction unit comprises a hydrothermal reactor (6) and a heat exchanger (8), the hydrothermal reactor (6) has the biochar inlet and a water inlet, the heat exchanger (8) has a heat exchange channel and a heat medium channel, an inlet of the heat medium channel is the second heat medium inlet, and the heat exchange channel is connected with the water inlet to supply water to the hydrothermal reactor (6).

4. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as defined in any one of claims 1 to 3, wherein the system further comprises:

the storage bin (1) is connected with the crusher (2) and used for storing and providing the coal gangue raw material for the crusher (2).

5. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as claimed in claim 2 or 3, wherein the system further comprises:

and the second drying device (7) is connected with the hydrothermal reactor (6), and the second drying device (7) is used for drying the phosphorus removal adsorbent.

6. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as claimed in claim 2 or 3, wherein the hydrothermal reactor (6) is a hydrothermal synthesis reaction kettle.

7. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as recited in claim 3, wherein the heat exchanger (8) is a gas-liquid plate heat exchanger.

8. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as defined in any one of claims 1 to 3, wherein the combustion device (5) is a gas-oil dual-purpose combustor.

9. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as defined in any one of claims 1 to 3, wherein the pyrolysis device (4) is a rotary kiln.

10. The system for preparing the phosphorus removal adsorbent based on coal gangue pyrolysis as recited in claim 5, wherein the first drying device (3) and the second drying device (7) are both belt dryers.

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