Straw hydrothermal carbon-based coal-like briquette fuel for combustion and preparation method thereof

Abstract

The invention discloses straw hydrothermal carbon-based coal-like briquette fuel for combustion and a preparation method thereof. The preparation method comprises the following steps: crushing straws, carrying out hydrothermal carbonization at 220-240 DEG C for 20-30 min, and circulating water for 2-3 times in the hydrothermal carbonization process. The optimal process conditions are as follows: the hydrothermal carbonization temperature is 231 DEG C, the hydrothermal carbonization time is 25 min, water circulation is performed for 2 or 3 times in the hydrothermal carbonization process, the water content of hydrothermal carbon forming is 10-15%, and the forming pressure is 130 MPa. The straw hydrothermal carbon formed particles have the characteristics that the ash content is 2.11%, the volatile content is 78.63%, the high calorific value is 21.03 MJ / kg (the value is close to the combustion calorific value of coal), the comprehensive combustion characteristic index is 9.55% 2 / (K3. min<2>), the water permeability resistance is 10.24%, the compressive strength is 6.04 MPa, and the forming energy consumption is 8.92 J / g.

Description

technical field [0001] The invention relates to the technical field of utilization of biomass straw as fuel, in particular to a "coal-like" briquette fuel based on straw hydrothermal charcoal for combustion and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The main component of biomass straw is lignocellulose, which has the characteristics of large quantity, wide distribution, strong renewability and low pollution. However, most biomass stalks have not been fully and rationally utilized. For example, a small part of corn stalks is used as heating and cooking materials or roughage for animals, and most of them are used as field fertilizers o...

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Problems solved by technology

However, most biomass stalks have not been fully and rationally utilized. For example, a small part of corn stalks is used as heating and cooking materials or roughage for animals, and most of them are used as field fertilizers or burned on site.

[0004] At present, some straws are carbonized to prepare biochar for use as adsorbents, solid fuels or soil improvers, but limited by the carbonization process, the prepared biochar has poor combustion characteristics, molding characteristics, hydrophobicity and stability. It shows that it is easy to loosen in the case of high humidity or water, and its stability is poor, which affects transportation and storage, and it is also easy to cause microbial activities and cause internal corruption or spontaneous combustion or emission of polluted gases, which is not conducive to its use as a solid fuel. Combustion and transportation, thereby limiting the application range of straw biochar as a solid fuel

[0005] In addition, more liquid by-products will be produced after hydrothermal carbonization, and the high-value components are not fully utilized; and the treatment of liquid by-products is difficult, which increases the production cost of straw carbonization; hydrothermal carbonization continues to use fresh water , but also cause waste of water resources

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