A coal coke slurry, its preparation method and application

Abstract

This disclosure relates to a coal coke slurry, its preparation method, and its application. The method includes the following steps: mixing coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer, and water in a weight ratio of (1.8–4):1:(0.002–0.008):(0.0001–0.001):(1–3); wherein the composite dispersant comprises a first dispersant component and a second dispersant component; the first dispersant component comprises sodium lignosulfonate; and the second dispersant component comprises melamine water-reducing agent. This disclosure can effectively improve the stability of coal coke slurry and reduce its viscosity and water separation rate.

Description

Technical Field

[0001] This disclosure relates to the field of coal coke slurry gasification feedstock preparation, specifically to a coal coke slurry, its preparation method, and its application. Background Technology

[0002] Petroleum coke is a byproduct of oil refining, primarily used to manufacture graphite electrodes or as fuel. With increasing production and declining quality, petroleum coke commands low prices and has low added value. Therefore, the efficient and clean utilization of petroleum coke has become crucial for the sustainable and healthy development of petroleum refining enterprises. Furthermore, under increasingly stringent environmental regulations, the environmental problems caused by the combustion and low-value-added utilization of petroleum coke urgently need to be addressed. Consequently, relevant enterprises are actively exploring ways to efficiently and cleanly utilize petroleum coke.

[0003] In recent years, some petrochemical enterprises have utilized coal-water slurry gasification units, using a blend of petroleum coke and coal to produce coal coke slurry as a gasification feedstock. This has enabled the conversion of less reactive petroleum coke into syngas while simultaneously reducing raw material costs, becoming an important approach for its effective and clean utilization. The quality of coal slurry used for gasification is mainly affected by the properties of the raw materials, the particle size distribution of the slurry-forming materials, and additives. After blending with petroleum coke, due to its lower hydrophilicity compared to coal, the water separation rate of the resulting coal coke slurry increases and its stability decreases as the proportion of petroleum coke increases. This leads to sedimentation and is detrimental to its storage and transportation.

[0004] To date, there is relatively little research on the preparation of high-concentration coal coke slurry with blended petroleum coke. There is an urgent need to develop a coal coke slurry preparation method with suitable additive formulations, good fluidity, and high stability under high coke content to meet the production needs of coal gasification enterprises. Summary of the Invention

[0005] The purpose of this disclosure is to provide a coal coke slurry, its preparation method, and its application, which can effectively improve the stability of the coal coke slurry and reduce its viscosity and water separation rate.

[0006] To achieve the above objectives, the first aspect of this disclosure provides a method for preparing coal coke slurry, comprising the following steps: mixing coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water in a weight ratio of (1.8-4):1:(0.002-0.008):(0.0001-0.001):(1-3);

[0007] The composite dispersant comprises a first dispersant component and a second dispersant component; the first dispersant component comprises sodium lignosulfonate; and the second dispersant component comprises melamine water-reducing agent.

[0008] Optionally, the weight ratio of the coal sample, petroleum coke, composite dispersant, stabilizer and water is (2-3):1:(0.003-0.007):(0.00015-0.00075):(1.5-2.5).

[0009] Optionally, the coal sample raw material includes coal powder with a particle size of 8 to 200 mesh and coal powder with a particle size of 200 mesh or larger; the petroleum coke raw material includes petroleum coke particles with a particle size of 40 to 200 mesh and petroleum coke particles with a particle size of 200 mesh or larger.

[0010] Preferably, based on the total solid weight of the coal sample and the petroleum coke sample, the content of 8-14 mesh solids is 1-3% by weight, the content of 14-40 mesh solids is 6-10% by weight, the content of 40-200 mesh solids is 25-35% by weight, and the content of solids above 200 mesh is 55-65% by weight.

[0011] Preferably, based on the total weight of the coal sample and the petroleum coke sample, the content of solids in the 8-14 mesh range is 1.5-2.5% by weight, the content of solids in the 14-40 mesh range is 7-9% by weight, the content of solids in the 40-200 mesh range is 28-32% by weight, and the content of solids above 200 mesh is 58-62% by weight.

[0012] More preferably, based on the total weight of solids with a particle size of 40-200 mesh, the weight ratio of coal sample raw material to petroleum coke raw material is 1.5-2.5:1, preferably 1.8-2.2:1;

[0013] More preferably, based on the total weight of solids with a particle size of 200 mesh or larger, the weight ratio of coal sample raw material to petroleum coke raw material is 1.5 to 2.5:1, preferably 1.8 to 2.2:1;

[0014] Preferably, the volatile component content of the pulverized coal is 28-35% by weight, and the ash content is 5-10% by weight.

[0015] Optionally, based on the total weight of the composite dispersant, the weight ratio of the first dispersant component to the second dispersant component is (0.1-9):1, preferably (0.11-4):1.

[0016] Optionally, the stabilizer includes carboxymethyl cellulose;

[0017] Preferably, the stabilizer is added in solution form, and the concentration of the stabilizer solution is 1-2% by weight, preferably 1.2-1.7% by weight.

[0018] Optionally, the mixing of coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water includes:

[0019] The coal sample, petroleum coke, composite dispersant, and water are mixed to obtain a first mixture.

[0020] A stabilizer is added to the first mixture for a second mixing.

[0021] Optionally, the conditions for the first mixing include: a temperature of 20–35°C and a time of 10–25 min; preferably, a temperature of 25–30°C and a time of 15–20 min.

[0022] Optionally, the conditions for the second mixing include: a temperature of 20–35°C and a time of 10–25 min; preferably, a temperature of 25–30°C and a time of 15–20 min.

[0023] The second aspect of this disclosure provides a coal slurry prepared according to the method described in the first aspect of this disclosure.

[0024] Optionally, the solid content concentration of the coal coke slurry is 59-68% by weight, preferably 61-65% by weight; optionally, the apparent viscosity of the coal coke slurry at 20°C is 300-1200 mPa·s, preferably 500-800 mPa·s; and the water separation rate at 48h is 0-3% by volume, preferably 0-2.5% by volume.

[0025] This disclosure provides a third aspect regarding the application of the coal coke slurry described in the second aspect of this disclosure in the gasification reaction to produce syngas.

[0026] Through the above technical solution, this disclosure provides a coal coke slurry, its preparation method, and its application. This disclosure introduces a composite dispersant and stabilizer into the mixed slurry of coal sample raw material and petroleum coke raw material, which can effectively reduce the viscosity of the coal coke slurry product and avoid the problem of increased water separation rate of the finished slurry caused by the addition of petroleum coke during the slurry preparation process, thereby improving the stability of the coal coke slurry and obtaining a coal coke slurry gasification feedstock with low viscosity and high stability. The method is simple, the raw materials are readily available, and it has practical industrial application value.

[0027] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Detailed Implementation

[0028] The following provides a detailed description of specific embodiments of this disclosure. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit this disclosure.

[0029] The first aspect of this disclosure provides a method for preparing coal coke slurry, the method comprising the following steps:

[0030] The coal sample, petroleum coke, composite dispersant, stabilizer, and water were mixed in a weight ratio of (1.8–4):1:(0.002–0.008):(0.0001–0.001):(1–3).

[0031] The composite dispersant comprises a first dispersant component and a second dispersant component; the first dispersant component comprises sodium lignosulfonate; and the second dispersant component comprises melamine water-reducing agent.

[0032] This disclosure provides a method for preparing coal coke slurry. The method involves introducing a composite dispersant and stabilizer into a mixed slurry of coal sample and petroleum coke raw materials. This can effectively reduce the viscosity of the coal coke slurry product and avoid the problem of increased water separation rate of the finished slurry caused by the addition of petroleum coke during the slurry preparation process. It also improves the stability of the coal coke slurry and obtains coal coke slurry gasification feedstock with low viscosity and high stability. The method is simple, the raw materials are readily available, and it has practical industrial application value.

[0033] In a preferred embodiment, the weight ratio of coal sample, petroleum coke sample, composite dispersant, stabilizer, and water is (2-3):1:(0.003-0.007):(0.00015-0.00075):(1.5-2.5). The coal coke slurry prepared according to this embodiment has lower viscosity and water separation rate.

[0034] In one specific embodiment, the volatile component content of the pulverized coal is 28-35% by weight, and the ash content is 5-10% by weight.

[0035] In one embodiment, the coal sample raw material includes coal powder with a particle size of 8-200 mesh and coal powder with a particle size of 200 mesh or larger; the petroleum coke raw material includes petroleum coke particles with a particle size of 40-200 mesh and petroleum coke particles with a particle size of 200 mesh or larger. The method provided in this disclosure is adaptable to a wide range of particle size ranges for both coal sample raw materials and petroleum coke raw materials.

[0036] In one specific embodiment, based on the total solid weight of the coal sample and the petroleum coke sample, the content of 8-14 mesh solids is 1-3% by weight, the content of 14-40 mesh solids is 6-10% by weight, the content of 40-200 mesh solids is 25-35% by weight, and the content of solids above 200 mesh is 55-65% by weight.

[0037] In a preferred embodiment, based on the total weight of the coal sample and petroleum coke raw materials, the content of 8-14 mesh solids is 1.5-2.5% by weight, the content of 14-40 mesh solids is 7-9% by weight, the content of 40-200 mesh solids is 28-32% by weight, and the content of solids above 200 mesh is 58-62% by weight. By mixing the coal powder and petroleum coke particle size ratio according to this embodiment with the dispersant and stabilizer in the preparation method, a coal coke slurry product with better performance can be obtained.

[0038] In a preferred embodiment, based on the total weight of solids with a particle size of 40 to 200 mesh, the weight ratio of coal sample raw material to petroleum coke raw material is 1.5 to 2.5:1, preferably 1.8 to 2.2:1.

[0039] In a preferred embodiment, based on the total weight of solids with a particle size of 200 mesh or larger, the weight ratio of coal sample raw material to petroleum coke raw material is 1.5 to 2.5:1, preferably 1.8 to 2.2:1.

[0040] The inventors of this disclosure discovered in their research that coal slurry that could not achieve ideal results when using lignin sulfonate alone as a dispersant could be improved by using melamine water-reducing agent as a second dispersant component and as a composite dispersant component with the first dispersant component. This improved the dispersion effect, reduced the viscosity of the finished slurry, and enhanced its stability.

[0041] In a preferred embodiment, based on the total weight of the composite dispersant, the weight ratio of the first dispersant component to the second dispersant component is (0.1-9):1.

[0042] In a preferred embodiment, the weight ratio of the first dispersant component to the second dispersant component is (0.11–4):1. The composite dispersant components provided in this embodiment can achieve better dispersion effects during the preparation of coal coke slurry.

[0043] In a preferred embodiment, the stabilizer comprises carboxymethyl cellulose. The use of carboxymethyl cellulose as a stabilizer in this disclosure allows for better synergistic effects with the aforementioned composite dispersant during the preparation of coal coke slurry.

[0044] In one specific embodiment, the stabilizer is added in solution form, and the solution concentration of the stabilizer is 1-2% by weight, preferably 1.2-1.7% by weight.

[0045] The reagents used in this disclosure can be purchased through conventional channels or prepared using known methods.

[0046] In one embodiment, the mixing of coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water includes:

[0047] The coal sample, petroleum coke, composite dispersant, and water are mixed to obtain a first mixture.

[0048] A stabilizer is added to the first mixture for a second mixing. This disclosure allows for the step-by-step addition of the composite dispersant and stabilizer, resulting in better mixing and improved stability of the coal slurry.

[0049] In one specific embodiment, the conditions for the first mixing include a temperature of 20–35°C and a time of 10–25 hours; the conditions for the second mixing include a temperature of 20–35°C and a time of 10–25 hours. In a preferred embodiment, the conditions for the first mixing include a temperature of 25–30°C and a time of 15–20 hours; the conditions for the second mixing include a temperature of 25–30°C and a time of 15–20 hours. Performing the first and second mixing according to this embodiment helps to obtain a more ideal coal coke slurry with lower viscosity and higher stability.

[0050] The second aspect of this disclosure provides a coal slurry prepared according to the method described in the first aspect of this disclosure.

[0051] In one embodiment, the solid content of the coal slurry is 59-68% by weight, preferably 61-65% by weight.

[0052] In one specific embodiment, the apparent viscosity of the coal slurry is 300–1200 mPa·s, and the water separation rate is 0–3% by volume; preferably, the apparent viscosity is 500–800 mPa·s, and the water separation rate after 48 hours is 0–2.5% by volume.

[0053] This disclosure provides a third aspect regarding the application of the coal coke slurry described in the second aspect of this disclosure in the gasification reaction to produce syngas.

[0054] In this disclosure, conventional reaction apparatus and reaction conditions in the art can be used in the gasification reaction of coal coke slurry to produce syngas.

[0055] The present disclosure is further described in detail below through examples. All raw materials used in the examples are commercially available.

[0056] Among them, melamine water-reducing agent was purchased from Shijiazhuang Oushuo Chemical Co., Ltd.; sodium lignosulfonate was from Zhenhai Refining & Chemical Co., Ltd.; and carboxymethyl cellulose (CMC) was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0057] In the following examples and comparative examples, the instrument used to test the apparent viscosity was a coal-water slurry viscometer, and the test method included the method described in "Coal-water slurry test methods, Part 4: Determination of apparent viscosity".

[0058] The 48-hour water separation rate test method is as follows: fill a 50 mL graduated cylinder with coal slurry, seal it with a sealing film, and measure it after 48 hours.

[0059] 48h water separation rate = (height of water separated from coal slurry after 48h / original height of coal slurry) × 100%.

[0060] Example 1

[0061] In this embodiment, Zhejiang coal was used as the raw material for the coal sample. The volatile component content of the coal powder was 32.25% by weight and the ash content was 7.19% by weight. The petroleum coke came from Zhenhai Refining & Chemical Co., Ltd. The volatile component content of the petroleum coke raw material was 5.13% by weight and the ash content was 0.53% by weight.

[0062] Take 1.3g, 5.2g, 13g, and 26g of Zhejiang sea coal with particle sizes of 8-14 mesh, 14-40 mesh, 40-200 mesh, and above 200 mesh respectively (total 45.5g); take 6.5g and 13g of petroleum coke with particle sizes of 40-200 mesh and above 200 mesh respectively (total 19.5g); based on the total solid weight of the coal and petroleum coke raw materials, the content of 8-14 mesh solids is 2% by weight, the content of 14-40 mesh solids is 8% by weight, the content of 40-200 mesh solids is 30% by weight, and the content of above 200 mesh solids is 60% by weight; based on the total solid weight of 40-200 mesh solids, the weight ratio of coal raw materials to petroleum coke raw materials is 2:1; based on the total solid weight of 200 mesh solids, the weight ratio of coal raw materials to petroleum coke raw materials is 2:1.

[0063] Then, 39 mg of melamine water-reducing agent, 39 mg of sodium lignosulfonate and 35 g of water were added for the first mixing. The conditions for the first mixing included a temperature of 28°C and a time of 15 min. The weight ratio of sodium lignosulfonate (first dispersant component) to melamine water-reducing agent (second dispersant component) was 1:1.

[0064] Then, 0.67 g of a 1.5 wt% CMC solution was added for a second mixing. The conditions for the second mixing were: temperature 28℃ and time 15 min; coal coke slurry S-1 was obtained.

[0065] The weight ratio of coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water is 2.33:1:0.004:0.00052:1.8.

[0066] Comparative Example 1

[0067] This embodiment follows the method of Example 1, except that melamine water-reducing agent is not added, and sodium lignosulfonate is used alone as a dispersant. The rest of the process is the same as in Example 1, and coal slurry D-1 is obtained.

[0068] Comparative Example 2

[0069] The method of this embodiment is the same as that of Example 1, except that no CMC solution is added. The rest of the process is the same as that of Example 1, and coal slurry D-2 is obtained.

[0070] Example 2

[0071] The same coal and petroleum coke raw materials as in Example 1 were used; and the particle composition of different mesh sizes was also the same as in Example 1.

[0072] Add 23.4 mg of melamine water-reducing agent, 54.6 mg of sodium lignosulfonate and 35 g of water for the first mixing; wherein the weight ratio of sodium lignosulfonate (first dispersant component) to melamine water-reducing agent (second dispersant component) is 2.33:1;

[0073] Then, 0.67 g of a 1.5% by weight CMC solution was added for a second mixing to obtain coal coke slurry S-2. The weight ratio of coal sample, petroleum coke, composite dispersant, stabilizer and water was 2.33:1:0.004:0.00052:1.8.

[0074] Example 3

[0075] The same coal and petroleum coke raw materials as in Example 1 were used, and the particle composition of different mesh sizes was also the same as in Example 1.

[0076] Add 54.6 mg of melamine water-reducing agent, 23.4 mg of sodium lignosulfonate and 35 g of water for the first mixing. The conditions for the first mixing are: temperature of 28℃ and time of 15 min; wherein the weight ratio of sodium lignosulfonate (first dispersant component) to melamine water-reducing agent (second dispersant component) is 0.43:1.

[0077] Then, 0.67 g of a 1.5% by weight CMC solution was added for a second mixing. The conditions for the second mixing were: temperature 28°C and time 15 min; coal coke slurry S-3 was obtained.

[0078] The weight ratio of coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water is 2.33:1:0.004:0.00052:1.8.

[0079] Example 4

[0080] This embodiment refers to the method of Embodiment 1, and the only difference from Embodiment 1 is:

[0081] 0.53 g of a 1.5% by weight CMC solution was added for a second mixing. The weight ratio of coal sample, petroleum coke, composite dispersant, stabilizer and water was 2.33:1:0.004:0.00041:1.8. The rest of the process was the same as in Example 1, and coal coke slurry S-4 was obtained.

[0082] Example 5

[0083] This embodiment refers to the method of Embodiment 1, and the only difference from Embodiment 1 is:

[0084] Add 0.32 g of 1.5% by weight CMC solution for a second mixing; the weight ratio of coal sample, petroleum coke, composite dispersant, stabilizer and water is 2.33:1:0.004:0.00025:1.8.

[0085] The remaining preparation process is the same as in Example 1, yielding coal coke slurry S-5.

[0086] Example 6

[0087] This embodiment refers to the method of Embodiment 1, and the only difference from Embodiment 1 is:

[0088] During the first mixing, add 58.5 mg of melamine water-reducing agent, 58.5 mg of sodium lignosulfonate, and 35 g of water; during the second mixing, add 0.25 g of a 1.5% by weight CMC solution.

[0089] The weight ratio of coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water is 2.33:1:0.006:0.0002:1.8; the rest of the preparation process is the same as in Example 1, and coal coke slurry S-6 is obtained.

[0090] Example 7

[0091] This embodiment refers to the method of Embodiment 1, and the only difference from Embodiment 1 is:

[0092] During the first mixing, add 32.5 mg of melamine water-reducing agent, 32.5 mg of sodium lignosulfonate, and 35 g of water;

[0093] During the second mixing, 0.23 g of a 1.5% by weight CMC solution was added;

[0094] The weight ratio of coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water is 2.33:1:0.0033:0.00018:1.8; the rest of the preparation process is the same as in Example 1, and coal coke slurry S-7 is obtained.

[0095] Example 8

[0096] This embodiment refers to the method of Embodiment 1, and the only difference from Embodiment 1 is:

[0097] During the first mixing, add 32.5 mg of melamine water-reducing agent, 32.5 mg of sodium lignosulfonate, and 35 g of water;

[0098] During the second mixing, 0.14 g of a 1.5% by weight CMC solution was added.

[0099] The weight ratio of coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water is 2.33:1:0.0030:0.00011:1.8; the rest of the preparation process is the same as in Example 1, and coal coke slurry S-8 is obtained.

[0100] Example 9

[0101] This embodiment refers to the method of Embodiment 1, and the only difference from Embodiment 1 is:

[0102] Add 8.67 mg of melamine water-reducing agent, 69.33 mg of sodium lignosulfonate and 35 g of water for the first mixing; the weight ratio of sodium lignosulfonate (first dispersant component) to melamine water-reducing agent (second dispersant component) is 8:1; and coal coke slurry S-9 is obtained.

[0103] The weight ratio of coal sample, petroleum coke sample, composite dispersant, stabilizer and water is 2.33:1:0.004:0.00052:1.8.

[0104] Example 10

[0105] This embodiment refers to the method of Embodiment 1, and the only difference from Embodiment 1 is:

[0106] The conditions for the first mixing are: temperature 20℃ and time 12 min; the conditions for the second mixing are: temperature 20℃ and time 12 min; thus, coal coke slurry S-10 is obtained.

[0107] Example 11

[0108] In this embodiment, Zhen 21 coal was used as the raw material for the coal sample. The volatile component content of the coal powder was 31.83% by weight and the ash content was 6.43% by weight. The petroleum coke came from Zhenhai Refining & Chemical Co., Ltd. The volatile component content of the petroleum coke raw material was 5.13% by weight and the ash content was 0.53% by weight.

[0109] Take 1.22g, 4.88g, 12.2g, and 24.4g of Zhen 21 coal (8-14 mesh, 14-40 mesh, 40-200 mesh, and >200 mesh respectively, totaling 42.7g); take 6.1g and 12.2g of petroleum coke (40-200 mesh and >200 mesh respectively, totaling 18.3g). Based on the total solid weight of the coal and petroleum coke samples, the content of solids in the 8-14 mesh range is 2% by weight, the content of solids in the 14-40 mesh range is 8% by weight, the content of solids in the 40-200 mesh range is 30% by weight, and the content of solids above 200 mesh is 60% by weight. Based on the total weight of solids with a particle size of 40-200 mesh, the weight ratio of coal to petroleum coke is 2:1; based on the total weight of solids with a particle size of 200 mesh or above, the weight ratio of coal to petroleum coke is 2:1.

[0110] Then, 97.6 mg of melamine water-reducing agent, 24.4 mg of sodium lignosulfonate and 39 g of water were added for the first mixing. The conditions for the first mixing included: a temperature of 30°C and a time of 20 min; the weight ratio of sodium lignosulfonate (first dispersant component) to melamine water-reducing agent (second dispersant component) was 0.25:1.

[0111] Then, 0.26 g of a 1.5% by weight CMC solution was added for a second mixing. The conditions for the second mixing were: temperature 30°C and time 20 min.

[0112] The weight ratio of coal sample, petroleum coke sample, composite dispersant, stabilizer, and water was 2.33:1:0.0067:0.00021:2.1. This yielded coal-coke slurry S-11.

[0113] The solid concentration, apparent viscosity (at 20°C and a shear rate of 100 1 / s) and water separation rate after 48 hours of the coal slurry obtained from the above examples and comparative examples are listed in Table 1 below.

[0114] Table 1

[0115]

[0116]

[0117] According to the data in Table 1 above:

[0118] Comparing Example 1 with Comparative Example 1, which does not contain melamine water-reducing agent, it can be seen that the apparent viscosity and 48h water separation rate of the coal-water slurry obtained by the method provided in this disclosure are significantly reduced, with the viscosity reduced by about 28.4% and the water separation rate reduced by about 45.5%.

[0119] In Comparative Example 2, no stabilizer solution was added. Comparing Example 1 and Comparative Example 2, it can be seen that the method provided by this disclosure can effectively reduce the water separation rate of coal coke slurry while maintaining the apparent viscosity of coal coke slurry to meet the usage requirements. Compared with Comparative Example 2, the water separation rate of coal coke slurry obtained in Example 1 was reduced by about 92.4%.

[0120] Comparing Example 8 with Example 1, it can be seen that the weight ratio of the stabilizer added in Example 1 is within the range of the preferred embodiments disclosed in this disclosure. The coal slurry obtained in Example 1 not only maintains the apparent viscosity of the coal slurry to meet the usage requirements, but also effectively reduces the water separation rate of the coal slurry, resulting in higher stability. Compared with Example 8, the water separation rate of the coal slurry obtained in Example 1 is reduced by about 80.8%.

[0121] Comparing Example 9 with Example 1, it can be seen that the weight ratio of sodium lignosulfonate to melamine water-reducing agent in Example 1 is within the range of the preferred embodiments disclosed in this disclosure. The apparent viscosity and 48h water separation rate of the coal slurry obtained in Example 1 are significantly reduced, with the viscosity reduced by about 22.2% and the water separation rate reduced by about 39.2%.

[0122] Comparing Example 10 with Example 1, it can be seen that the conditions of the first and second mixing in Example 1 are within the scope of the preferred embodiments of this disclosure. The apparent viscosity and 48h water separation rate of the coal slurry obtained in Example 1 are significantly reduced, with the viscosity reduced by about 30.4% and the water separation rate reduced by about 49.5%.

[0123] The preferred embodiments of this disclosure have been described in detail above. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0124] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0125] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A method for preparing coal coke slurry, characterized in that, Includes the following steps: The coal sample, petroleum coke, composite dispersant, stabilizer, and water were mixed in a weight ratio of (1.8~4):1:(0.002~0.008):(0.0001~0.001):(1~3). The composite dispersant comprises a first dispersant component and a second dispersant component; the first dispersant component comprises sodium lignosulfonate; the second dispersant component comprises melamine water-reducing agent; based on the total weight of the composite dispersant, the weight ratio of the first dispersant component to the second dispersant component is (0.1~9):1; The stabilizer includes carboxymethyl cellulose; the stabilizer is added in solution form, and the solution concentration of the stabilizer is 1-2 by weight.

2. The method according to claim 1, characterized in that, The weight ratio of the coal sample, petroleum coke, composite dispersant, stabilizer and water is (2~3):1:(0.003~0.007):(0.00015~0.00075):(1.5~2.5).

3. The method according to claim 1, characterized in that, The coal sample raw material includes coal powder with a particle size of 8-200 mesh and coal powder with a particle size of 200 mesh or larger; the petroleum coke raw material includes petroleum coke particles with a particle size of 40-200 mesh and petroleum coke particles with a particle size of 200 mesh or larger.

4. The method according to claim 3, characterized in that, Based on the total solid weight of coal and petroleum coke raw materials, the content of solids of 8-14 mesh is 1-3% by weight, the content of solids of 14-40 mesh is 6-10% by weight, the content of solids of 40-200 mesh is 25-35% by weight, and the content of solids of 200 mesh and above is 55-65% by weight.

5. The method according to claim 4, characterized in that, Based on the total weight of coal and petroleum coke raw materials, the content of solids in 8-14 mesh is 1.5-2.5% by weight, the content of solids in 14-40 mesh is 7-9% by weight, the content of solids in 40-200 mesh is 28-32% by weight, and the content of solids above 200 mesh is 58-62% by weight.

6. The method according to claim 3, characterized in that, Based on the total weight of solids with a particle size of 40-200 mesh, the weight ratio of coal raw material to petroleum coke raw material is 1.5-2.5:

1.

7. The method according to claim 6, characterized in that, Based on the total weight of solids with a particle size of 40-200 mesh, the weight ratio of coal raw material to petroleum coke raw material is 1.8-2.2:

1.

8. The method according to claim 3, characterized in that, Based on the total weight of solids with a particle size of 200 mesh or larger, the weight ratio of coal raw material to petroleum coke raw material is 1.5~2.5:

1.

9. The method according to claim 8, characterized in that, Based on the total weight of solids with a particle size of 200 mesh or larger, the weight ratio of coal raw material to petroleum coke raw material is 1.8~2.2:

1.

10. The method according to claim 3, characterized in that, The volatile component content of the pulverized coal is 28-35% by weight, and the ash content is 5-10% by weight.

11. The method according to claim 1, characterized in that, Based on the total weight of the composite dispersant, the weight ratio of the first dispersant component to the second dispersant component is (0.11~4):

1.

12. The method according to claim 1, characterized in that, The stabilizer is added in solution form, and the solution concentration of the stabilizer is 1.2 to 1.7 by weight.

13. The method according to claim 1, characterized in that, The process of mixing coal sample raw material, petroleum coke raw material, composite dispersant, stabilizer and water includes: The coal sample, petroleum coke, composite dispersant, and water are mixed to obtain a first mixture. A stabilizer is added to the first mixture for a second mixing.

14. The method according to claim 13, characterized in that, The conditions for the first mixing include: a temperature of 20~35℃ and a time of 10~25min.

15. The method according to claim 14, characterized in that, The conditions for the first mixing include: a temperature of 25~30℃ and a time of 15~20min.

16. The method according to claim 13, characterized in that, The conditions for the second mixing include a temperature of 20-35°C and a time of 10-25 minutes.

17. The method according to claim 16, characterized in that, The conditions for the second mixing include: a temperature of 25~30℃ and a time of 15~20min.

18. The coal slurry prepared by the method according to any one of claims 1 to 17.

19. The coal slurry according to claim 18, characterized in that, The solid content of the coal slurry is 59-68% by weight.

20. The coal slurry according to claim 19, characterized in that, The solid content of the coal slurry is 61-65% by weight.

21. The coal slurry according to claim 18, characterized in that, The apparent viscosity of the coal slurry at 20°C is 300~1200 mPa·s; the water separation rate after 48 hours is 0~3% by volume.

22. The coal slurry according to claim 21, characterized in that, The apparent viscosity of the coal slurry at 20°C is 500~800 mPa·s; the water separation rate after 48 hours is 0~2.5% by volume.

23. The application of the coal coke slurry according to any one of claims 18 to 22 in the gasification reaction to produce syngas.

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